Biosurfactant Production From Unconventional Resources

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    Biosurfactant Production from UnconventionalResources: a Short Overview

    ARTICLE JANUARY 2012

    CITATIONS

    3READS

    349

    5 AUTHORS, INCLUDING:

    Diego Coelho

    University of Campinas

    13PUBLICATIONS 27CITATIONS

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    Edgar Silveira

    Universidade Federal de Uberlndia (UFU)

    28PUBLICATIONS 102CITATIONS

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    Roberto Souza

    Universidade Federal de Sergipe

    52PUBLICATIONS 229CITATIONS

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    Elias Basile Tambourgi

    University of Campinas

    156PUBLICATIONS 1,220CITATIONS

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    All in-text references underlined in blueare linked to publications on ResearchGate,

    letting you access and read them immediately.

    Available from: Diego Coelho

    Retrieved on: 06 January 2016

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    International Review of Chemical Engineering (I.RE.CH.E.), Vol. 4, N. 2

    ISSN 2035-1755 March 2012

    Manuscript received and revised February 2011, accepted March 2012 Copyright 2012 Praise Worthy Prize S.r.l. - All rights reserved

    175

    Biosurfactant Production from Unconventional Resources:

    a Short Overview

    Diego F. Coelho1, Silvanito A. Barbosa2, Edgar Silveira3,

    Roberto R. Souza4, Elias B. Tambourgi5

    Abstract The Biosurfactant production has experienced an intensive and fast growing since it

    was "discovered". As its own definition, biosurfactants are a class of surface-active molecules that

    are produced extracellularly or as part of the cell membrane by microorganisms, i.e., by a

    biological pathway. In the last years, several researchers groups' have focused its efforts on

    investigation of a medium composition which could maximize the production of these surface

    active agents and make it economically feasible. Thus, the purpose of this review is to provide a

    comprehensive and updated overview of the use of agro-industrial wastes and renewable

    resources as raw material for production of biosurfactants and also to focus on principal

    applications of biosurfactants, covering part of its wide range of chemical specialty. Copyright

    2012 Praise Worthy Prize S.r.l. - All rights reserved.

    Keywords:Biosurfactant, Renewable-Resources, Agroindustrial Wastes

    I.

    Introduction

    The surfactants are SURFace ACTive AgeNTS and

    constitute an important class of chemical products widely

    used in a great variety of household and industrial

    applications and indispensable components of daily life

    [1]-[2]. Their production was estimated in 2007 to bearound 10 million tons per year [3]. They are widely

    used in the pharmaceutical, cosmetic, petroleum, and

    food industries [4]. Surfactants are amphiphilic

    compounds that reduce the free energy of the system by

    replacing the bulk molecules of higher energy at an

    interface, signifying, e.g., which surfactants assist the

    solubility of polar compounds in organic solvents.

    Surfactants have been used industrially as adhesives,

    flocculating, wetting and foaming agents, demulsifiers

    and penetrants [5]. They are used for these applications

    based on their abilities to lower surface tensions, increase

    solubility, detergency power, wetting ability and foaming

    capacity [4].The presence of surfactants can lead to anincrease in the concentration of hydrophobic compounds

    in the water phase, through the formation of oil water

    emulsions and solubilization, where, above the Critical

    Micelle Concentration (CMC), biosurfactant molecules

    aggregate to form micelles. [6].At concentrations above

    the CMC, biosurfactant molecules associate to form

    micelles, bilayers and vesicles. The CMC is obtained

    where the surface tension remains steady despite the

    changes in concentration as represented Fig. 1 [15].

    Micelle formation enables biosurfactants to reduce the

    surface and interfacial tension and increase the solubility

    and bioavailability of hydrophobic organic compounds

    [12].

    The CMC is commonly used to measure the efficiency

    of surfactant. Efficient biosurfactants have a low CMC,

    which means that less biosurfactant is required to

    decrease the surface tension [15].

    The effectiveness of a surfactant is determined by its

    ability to lower the surface tension, which is a measure

    of the surface free energy per unit area required to bringa molecule from the bulk phase to the surface [7].

    Fig. 1. Relationship of Surface tension, interfacial tension,

    solubilization and CMC with biosurfactant concentration

    Many different types, with several structures (see Fig.

    2), of surfactants are already being used in industry, but

    it is important to develop even more new compounds to

    broaden the spectrum of specific properties and

    applications [8].

    Most of these surfactants are petroleum based, i.e.,

    they are chemically synthesized. That origin makes them

    environmentally harmful, decreasing organic degradation

    https://www.researchgate.net/publication/229930032_Properties_and_industrial_applications_of_sophorolipids?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/6352701_Microbial_production_and_application_of_sophorolipids_Appl_Microbiol_Biotechnol?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/8201898_Mulligan_CN_Environmental_applications_for_biosurfactants_Environ_Pollut_1332_183-198?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/8201898_Mulligan_CN_Environmental_applications_for_biosurfactants_Environ_Pollut_1332_183-198?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/11016558_Microbial_surfactants_and_their_use_in_field_studies_of_soil_remediation_J_Appl_Microbiol?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/14112145_Microbial_production_of_surfactants_and_their_commercial_potential_MMBR?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/49854063_Review_Environmental_Applications_of_Biosurfactants_Recent_Advances?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/14112145_Microbial_production_of_surfactants_and_their_commercial_potential_MMBR?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/243778501_Surfactants_And_Interfacial_Phenomena?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/243778501_Surfactants_And_Interfacial_Phenomena?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/14112145_Microbial_production_of_surfactants_and_their_commercial_potential_MMBR?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/14112145_Microbial_production_of_surfactants_and_their_commercial_potential_MMBR?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/49854063_Review_Environmental_Applications_of_Biosurfactants_Recent_Advances?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/11016558_Microbial_surfactants_and_their_use_in_field_studies_of_soil_remediation_J_Appl_Microbiol?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/8201898_Mulligan_CN_Environmental_applications_for_biosurfactants_Environ_Pollut_1332_183-198?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/8201898_Mulligan_CN_Environmental_applications_for_biosurfactants_Environ_Pollut_1332_183-198?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/6352701_Microbial_production_and_application_of_sophorolipids_Appl_Microbiol_Biotechnol?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/229930032_Properties_and_industrial_applications_of_sophorolipids?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/227609815_Production_and_application_of_trehalose_lipid_biosurfactants?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==
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    176

    possibly through its toxic effects [6]. However the

    leading trend towards using environmental friendly

    technologies has enhanced the search for biodegradable

    compounds of natural origin [9].

    Then, in the past few decades, a heterogeneous group

    of surface-active molecules and microbial origin,

    referred to as biosurfactants, have gained considerableinterest.

    Fig. 2. Chemical Structures of some common biosurfactants

    They present several advantages over synthetic

    surfactants. The biodegradability of these biological

    surfactants is one of major properties, because it prevents

    accumulation and toxicity problems in natural

    ecosystems, once that the capability of these molecules

    to emulsify water and hydrocarbons enhances the

    biodegradation of pollutants. Nevertheless, from an

    economic standpoint, biosurfactants are not yet

    competitive with the synthetics, because the raw material

    and production cost are expensive. So far, several

    renewable substrates from various sources, especially

    from industrial wastes have been intensively studied for

    microorganism cultivation and surfactant production at

    an experimental scale [10].

    The choice of inexpensive raw materials is important

    to the overall economy of the process because they

    account for a large quote of the final product cost (about

    50%) and also reduce, or eliminate, the expenses with

    wastes treatment [11].

    The purpose of this review is to provide acomprehensive and updated overview of the use of agro-

    industrial wastes and renewable resources as raw

    material for production of biosurfactants and also to

    focus on principal applications of biosurfactants,

    covering part of its wide range of chemical specialty.

    II. But what actually are Biosurfactants?

    As its own definition, biosurfactants are a class of

    surface-active molecules that are produced

    extracellularly or as part of the cell membrane by

    microorganisms, i.e., by a biological pathway.

    TABLEI

    MAIN TYPES AND EXAMPLES OF SOME BIOSURFACTANTS PRODUCED

    BY MICROORGANISMS (ADAPTED FROM [13])

    Main Types Examples Microorganisms

    Glycolipids

    Trehalose lipidRhodococcus

    erithropolis

    Sophorose lipidTorulopsis magnoliae,

    Candida bombicola

    Rhamnose lipidPseudomonas

    aeruginosa

    Mannosylerithritol

    lipid

    Shizonella

    melanogramma,

    Pseudozyma

    Antarctica

    LiposaccharidesEmulsane Acinetobacter

    calcoaceticus

    AlasanAcinetobacter

    radioresistens

    Lipopeptides

    Surfactin Bacillus subtilis

    ViscosinePseudomonas

    fluorescens

    Polymers

    EmulsanAcinetobacter

    calcoaceticus

    BiodispersanAcinetobacter

    calcoaceticus

    Liposan Candida lipolytica

    Phospholipids

    Fatty acids and

    neutral lipids

    Corynomycolic

    acid

    Corynebacterium

    insidibasseosum

    All surfactants have a common structure: a lipophilic

    portion, with a hydrocarbon of one or more fatty acids,

    bounded to a hydrophilic portion, which can be an ester;

    a hydroxyl group; a phosphate; a carbohydrate or a

    carboxylate [8]. The fatty acids can be saturated (or not),

    hydroxylated or branched.

    Unlike chemically synthesized surfactants, which are

    classified according to their dissociation pattern in water,

    biosurfactants are categorized by their chemical

    composition, molecular weight, physic-chemical

    properties and mode of action and microbial origin [12].

    A large variety of microorganisms are known to

    produce biosurfactants, which vary in their chemical

    https://www.researchgate.net/publication/11016558_Microbial_surfactants_and_their_use_in_field_studies_of_soil_remediation_J_Appl_Microbiol?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/51637836_Advances_in_utilization_of_renewable_substrates_for_biosurfactant_production_AMB_Express_11-19?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/26472533_Production_of_biosurfactants_using_substrates_from_renewable-resources_Songklanakarin_J_Sci_Technol?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/226313785_Biosurfactant_production_by_microorganisms_on_unconventional_carbon_sources?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/7001671_Adsorption_on_stainless_steel_surfaces_of_biosurfactants_produced_by_gram-negative_and_gram-positive_bacteria_consequence_on_the_bioadhesive_behavior_of_Listeria_monocytogenes_Colloids_Surf_B_Biointer?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/7001671_Adsorption_on_stainless_steel_surfaces_of_biosurfactants_produced_by_gram-negative_and_gram-positive_bacteria_consequence_on_the_bioadhesive_behavior_of_Listeria_monocytogenes_Colloids_Surf_B_Biointer?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/226313785_Biosurfactant_production_by_microorganisms_on_unconventional_carbon_sources?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/26472533_Production_of_biosurfactants_using_substrates_from_renewable-resources_Songklanakarin_J_Sci_Technol?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/51637836_Advances_in_utilization_of_renewable_substrates_for_biosurfactant_production_AMB_Express_11-19?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/11016558_Microbial_surfactants_and_their_use_in_field_studies_of_soil_remediation_J_Appl_Microbiol?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==
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    178

    III.1. Biosurfactant Production

    on Oil-Containing Wastes

    World production of oils and fats, founded in all

    living cells, are most used in the food industry, is about

    2.5-3 million tons and generates great quantities of

    wastes, tallow, lard, marine oils or soap stick, and free

    fatty acids from the extraction of seed oils. Wastedisposal is a growing problem, which explains the

    increasing interest in use of waste in microbial

    transformation [24]. Waste or used lubricating oils are a

    serious environmental problem. In the environment, the

    waste oil can bind to organic matter, mineral particles

    and organisms [33]. Mercade et al. [34] reported the

    screening and selection of microorganisms capable of

    utilizing waste lube oil for producing biosurfactants.

    From 18 hydrocarbon-contaminated soil samples, 44

    different isolates capable of growth on waste lube oil (as

    sole carbon source) were selected. Only 10% of the

    strains isolated produced biosurfactants (trehaloseglycolipids, from Rhodococcus sp., and lipopeptides,

    from Bacillus sp.). The production of bioemulsifiers by

    Candida lipolytica (strains 1055 and 1120) using media

    supplemented with 5% Babassu oil and 1% glucose as

    carbon source was evaluated by Sarubbo et al. [35].

    The bioemulsifiers was produced as secondary

    metabolites at the end of the exponential growth phase

    and beginning of the stationary growth phase.

    Alcanivorax borkumensis utilizes aliphatic

    hydrocarbons as its main carbon source for growth and

    produces an anionic glucose lipid biosurfactant and thus

    potentials of Alcanivorax strains during bioremediation

    of hydrocarbon pollution in marine habitats have beenstudied [36]. Frying oil is produced in large quantities for

    use both in the food industry and at the domestic scale.

    They can act as effective and inexpensive raw materials

    for biosurfactant production [20]-[37]. Additionally, any

    oil wastes from vegetable oil refineries and the food

    industry have a potential to induce microbial growth and

    also been used as appropriate substrates for biosurfactant

    production. P. aeruginosaPACL strain, isolated from oil-

    contaminated soil taken from a lagoon has been grown in

    residual waste of soybean oils to produce biosurfactant

    by submerged fermentation in stirred tank reactors [38].

    Sunflower seed oil and oleic acid can be used for the

    production of rhamnolipids by Thermus thermophilusHB8.

    The potential production of rhamnolipids has been

    demonstrated using Thermophilic eubacterium [39].

    Thus, a sound strategy of waste management for the food

    and auto industries to reduce is produce biosurfactant

    from vegetable oils, used vegetable oil and used lube oil,

    reducing the generation of waste.

    III.2. Biosurfactant Production

    from Agro-Industrial Wastes

    Although hydrocarbons have been used as substrates

    of choice for the production of biosurfactants and

    bioemulsifiers [40]-[41] due the effect of induction of

    biosurfactant production, which makes any hydrophobic

    substrate accessible to the cell, water-soluble substrates

    also have been used [11].

    Moreover, for many applications (e.g. food and

    cosmetic industry) substrates hydrocarbon based are

    unacceptable. Water-soluble substrates are cheaper andare preferred over hydrocarbons since single-phase

    fermentations are simpler than biphasic fermentation

    [11]. The disposal of wastes is a well-known and

    growing problem, and new alternatives for their use are

    being studied once the treatment and disposal costs for

    these wastes are a vast financial burden to various

    industries [42].

    Then, the use of alternative low-cost substrates is an

    important strategy to facilitate industrial development of

    biosurfactant production. To this end, good components

    seem to be agroindustrial byproducts or wastes, once

    these residues generally contain high levels of

    carbohydrates or lipids to support growth and surfactantsynthesis [19].

    These agricultural based wastes are influenced by the

    agricultural practices and industries and are based in

    particular regions or countries. For example, in Brazil,

    the production of soap stock (one of the wastes of the oil

    neutralization process in soybean oil refining) amounts to

    2-3% of the total oil production and is affected by the

    fatty acid content of the oil [9]. Brazil is also among the

    main producers of vegetable oils, such as soybean oil,

    babassu oil and palm oil [43].

    Rufino and Co-workers [44] applied a sequential

    factorial design to optimize biosurfactant production by

    Candida lipolyticausing soybean oil refinery residue as

    substrate. This study evaluated the impact of three

    cultivation factors, amounts of refinery residue, glutamic

    acid and yeast extract. The resultant biosurfactant

    showed high emulsifying ability and surface activity,

    with stability at wide range of pH (2-12), temperatures

    (0-120C) and salinity (2-10% NaCl).

    Nitschke et al. [45] evaluated the utilization of oil

    wastes for the production of rhamnolipids by

    Pseudomonas aeruginosaLBI strain. They used wastes

    obtained from soybean, cottonseed, babassu, palm, and

    corn oil refinery. The best results were achieved for the

    soybean soap stock waste, which generated 11.7 g/l ofrhamnolipids and a production yield of 75%,

    highlighting the fact that low cost substrate can be

    utilized for rhamnolipid production for application in

    high value pharmaceutical and food industry applications

    [46]. Using molasses (which is a rich source of available

    carbon produced as co-product of sugar industry

    generated during sugar manufacturing) and corn-steep

    liquor as the primary carbon and nitrogen source, Patel

    and Desai [47] produced a rhamnolipid biosurfactant

    using P. aeruginosa (Strain GS3). The biosurfactant

    production reached a maximum when a combination of

    7% (v/v) molasses and 0.5% (v/v) corn-steep liquor

    waste used.

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    179

    TABLEIII

    EXAMPLES OF BIOSURFACTANT PRODUCTION USING AGROINDUSTRIAL WASTES (ADAPTED FROM [49])

    Substrate Chemical Class Microorganisms Reference

    Olive Oil Mill Effluent (OOME) rhamnolipids Pseudomonas sp. [57]

    Soybean Oil Refinery Wastes rhamnolipids P. aeruginosa [58]

    Molasses lipopeptides B. subtilis [59]

    Whey rhamnolipids P. aeruginosa [60]

    Waste frying Oil rhamnolipids P. aeruginosa [61]

    Waste Lubricating Oil glycolipids Rhodococcus sp. [34]

    Deprotenized Whey sophorolipids C. bombicola [62]

    Cassava Waste lipopeptides B. subtilis [63]

    In their studies, de Gusmo et al. [48] applied a

    factorial design to investigate the effects and interactionsproduced by use of vegetable fat waste, yeast extract and

    glucose in the production of biosurfactant by Candida

    glabrata after 144 h of cultivation. Was achieved a

    maximum surface activity with vegetable fat waste at 5%

    and yeast extract at 0.2%.

    Beyond this study was the first report on the use of a

    vegetable fat waste as substrate for biosurfactant

    production, the product containing cell-free broth

    retained its surface-active properties after incubation at

    high temperatures, at a wide range of pH values and salt

    concentrations. Structural determination suggests it to be

    a mixture of carbohydrates, proteins and lipids and theauthors further concluded its suitability for use in

    bioremediation and oil recovery. P. aeruginosa can be

    cultivated in Cashew Apple Juice (CAJ) supplemented

    with peptone (5.0 g/L) and nutritive broth to obtain

    surfactants. Surface tension during the fermentation can

    be reduced by 41% when P. aeruginosa is cultivated in

    CAJ supplemented with peptone [50] compared to other

    amino acid sources. Ohno et al. [51]-[52] reported

    production of iturin and surfactin by a strain of B.

    subtilis NB 22 using wheat bran and okara (soybean curd

    residue produced as by-product of tofu manufacturing

    processes). It is composed of water (81.1%), protein

    (4.8%), fat (3.6%), starch and sugar (6.4%), fiber (3.3%),and ash (0.8%). Table III shows the main agroindustrial

    wastes used as main carbon source and study object of

    several researches. Recently, some researchers groups

    are directing their studies to genetic engineering [53]-

    [54]-[55]-[56], cloning genes and allowing biosurfactant-

    producing microorganisms to degrade specific waste and

    used it as substrate.

    IV. Biosurfactant Production Using

    Renewable Substrates

    Although the utilization of carbon rich wastes, likeagroindustrial wastes, allow us achieve a double benefit

    (reducing the pollutants while produce useful products),

    the selection of suitable waste material with the rightproportion of nutrients that permits microorganism

    growth and production of target-product is the main

    problem associated.

    Furthermore, the constituents of the waste could affect

    the properties of the final product and, consequently, its

    functionality [9].Thus, the development of a promising

    and economically feasible process for biosurfactant

    production appears to depend upon the use of abundant

    and low-cost raw materials and the optimization of the

    operational cultivation conditions.

    The plant biomass is the main sustainable source of

    renewable, providing low cost raw materials, reductionin environmental pollution, and relative ease of

    operation. A large body of literature on biosurfactant

    production using substrate related to vegetable industries

    exists and has a geographical significance in relation to

    industries associated and type of biosurfactant produced

    [9].

    Oliveira et al. [43] used palm oil, a low-cost

    agricultural byproduct which is used in as raw material

    for soap and food industries, for biosurfactant production

    using Pseudomonas alcaligenes (a strain isolated from

    crude oil contaminated soil).

    They achieved a biosurfactants concentration of 2.3

    g/l and E24more than 70% with the hexane, jet fuel andcrude-oil. Abdel-Mawgoud et al. [64] reported the

    production of a rhamnolipid by Pseudomonas

    aeruginosa isolate Bs20 on soybean oil amended

    medium. Perfumo et al. [65] confirmed that the

    emulsifying capacity and thermo and halo tolerance

    properties presented by the rhamnolipid produced makes

    that biosurfactant adequate for use in bioremediation of

    hydrocarbon-contaminated sites or in the petroleum.

    Monteiro et al. [66] reported the growth and

    biosurfactant production using sunflower oil

    supplemented mineral medium by the yeast Trichosporon

    montevideense, CLOA 72. The glycolipid produced

    exhibited good surface and emulsifying activity with

    https://www.researchgate.net/publication/51637836_Advances_in_utilization_of_renewable_substrates_for_biosurfactant_production_AMB_Express_11-19?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==https://www.researchgate.net/publication/51637836_Advances_in_utilization_of_renewable_substrates_for_biosurfactant_production_AMB_Express_11-19?el=1_x_8&enrichId=rgreq-38ad4ad6-562e-4af8-838b-b25d51ad5b66&enrichSource=Y292ZXJQYWdlOzIzNTY3NTA0NDtBUzoxMDM5MjQzODgzMzU2MTdAMTQwMTc4ODkxMzU4Nw==
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    180

    vegetable oils, toluene, isooctane, cyclohexane, hexane

    and hexadecane. Furthermore, the biosurfactant was

    thermo and halo tolerant and stable in wide range of pH

    values.

    Sim et al. [67] studied the utilization of a mixture of

    canola oil, soy bean and glucose for rhamnolipid

    production by P. aeruginosa UW-1 and reported 10-12fold increase in rhamnolipid production on vegetable oils

    in comparison to glucose. Costa et al. [68] observed that

    Pseudomonas aeruginosa LBI produces a rhamnolipid

    that reduces extensively surface tension and shows good

    emulsification while evaluated the use of oil from

    Andiroba (Carapa guianensis), Babassu (Orbignya

    spp.), Buriti (Mauritia flexuosa), Brazilian Nut

    (Bertholletia excelsa), Cupuau (Theobroma

    grandiflora) and Passion Fruit (Passiflora alata). The

    Brazilian Nut shows the highest rhamnolipid

    concentrations (9.9 gl-1), followed by the Passion Fruit

    (9.2 g/l) oils. Prieto et al. [69], another Brazilian group,

    used a P. aeruginosa LBM10 isolated from a southerncoastal zone in Brazil, to produce a rhamnolipid-type

    biosurfactant growing on soybean oil, soybean oil

    soapstock, fish oil and glycerol. Production using

    soybean oil achieved the maximum yield and the

    biosurfactant was stable at a wide range of pH and salt

    concentration.

    V. Other Substrates Sources

    Some researchers groups studies around world carried

    out studies with some renewable substrates mainly

    confined to a particular geographic region.The glycerol produced as byproduct of biodiesel

    industry has accumulated more intensely with recent

    surge of this biofuel. The low cost glycerol could be used

    as water soluble substrate for biosurfactant production

    [9]. The utilization of glycerol as single carbon source by

    Pseudomonas aeruginosa in the production of a

    rhamnolipid was studied by Nitschke et al. [42], but

    yields were less compared to traditional hydrophobic

    substrates.

    Another production of rhamnolipid was reported by

    Rahman et al. [70], achieving 1.77 g/l of biosurfactant by

    P. aeruginosa DS10-129. Zhang et al. [71] produced,

    also using glycerol as the sole carbon source, 15.4 g/lrhamnolipids using P. aeruginosa growing on a basal

    mineral medium, showing clearly the feasibility of

    utilizing glycerol as carbon source for growth and

    biosurfactant production by microbes. Morita et al. [72]

    showed that Pseudozyma antarctica JCM 10317, a

    basidiomycete yeast, efficiently produced

    mannosylerythritol lipids (MELs) as glycolipid

    biosurfactants from glycerol, achieving 16.3 g/l by

    intermittent feeding of glycerol.

    Lee et al. [73] reported the use of fish oil for

    biosurfactant production. They optimized the culture

    medium for the Pseudomonas aeruginosaBYK-2 KCTC

    18012P for enhanced rhamnolipids production and used

    25 g/l fish oil as carbon source. In optimum conditions,

    they achieved a yield of 17 g/l of rhamnolipid.

    VI. Final Comments

    Active at extreme temperatures, pH and salinity; they

    are environmentally friendly, biodegradable, less toxicand non-hazardous, these are the main properties which

    makes the biosurfactants a potential substitute for the

    surfactant produced from petroleum derivatives. Many

    researchers continue to investigate the production of

    these microbial surface active agents using raw material

    widely marketed (industrially synthetized), trying to

    reduce the production cost through process

    optimizations. However, the combination of an industrial

    waste and a cheap substrate is a promising approach to

    reduce production cost and their polluting effect at the

    same time.

    Moreover, industrial by-products and renewable

    resources also can be used to produce them with equallyefficiency. Over this review, we can note the large variety

    of unconventional substrates that has been employed on

    studies of biosurfactant production and the main types of

    molecules produced. Precisely the property of generate a

    specific structure for each combination of

    microorganism; strain and formulation of fermentation

    media that make these compounds highly promising,

    once that studies can be performed easily to adjust the

    molecule for a particular purpose.

    These studies clearly indicate the vast potential of the

    unconventional substrates for the biosurfactant

    production and, most importantly, indicate that theproduction of these molecules needs to utilize a

    combination of several techniques (e.g., industrial

    strategies, genetic engineering or research to find new

    raw materials or microorganisms ) to overcome, from an

    economic standpoint, the synthetic surfactants. Current

    researches focus on the development of these techniques.

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    Authors information1Universidade Estadual de Campinas (UNICAMP), Faculdade de

    Engenharia Qumica, Departamento de Engenharia de Sistemas

    Qumicos e Informtica.

    E-mail:[email protected]

    2Instituto Federal de Educao, Cincia e Tecnologia de Sergipe (IFS).

    E-mail: [email protected]

    3Universidade So Paulo, Faculdade de Cincias Farmacuticas.

    E-mail: [email protected]

    4Universidade Federal e Sergipe (UFS), Departamento de Engenharia

    Qumica.

    E-mail: [email protected]

    5Universidade Estadual de Campinas (UNICAMP), Faculdade de

    Engenharia Qumica, Departamento de Engenharia de Sistemas

    Qumicos e Informtica.

    E-mail: [email protected]

    Diego de Freitas Coelho (Corresponding

    author), born in Salvador Brazil, Abril 2th,

    1987. Graduated in Industrial Chemistry in 2010

    at Universidade Federal de Sergipe, Sergipe,

    Brazil. Master degree obtained in 2012 at

    Universidade Estadual de Campinas, Campinas,

    Brazil. His major field of study is the

    purification of biomolecules from renewable raw

    materials and agroindustrial wastes. His preview published works

    involves the purification of proteolytic enzymes through fractional

    precipitation and aqueous two-phase systems. His most recently studies

    focuses on processes integration and processes optimization, also to

    purify biomolecules. At the moment, he is developing his Ph.D. thesis

    in modeling and construction of an annular centrifugal contactor to

    purify bromelain from agroindustrial wastes.

    Silvanito Alves Barbosa, born in Tobias

    Barreto - Sergipe - Brazil, February 12, 1971.

    Graduated in Industrial Chemistry in 1997 and

    in Chemistry in 2002 at Universidade Federal de

    Sergipe, Sergipe, Brazil. Doctor in

    Biotechnology in 2011 obtained from the

    Universidade Estadual do Cear. His main area

    of study is the production of biosurfactants for

    use as feedstock in the production of biodetergents in the oil industry.

    He is professor at the Instituto Federal de Cincia e Tecnologia de

    Sergipe - IFS - acting in the area of Chemical and Petrochemical

    Industry and developing works in agreement between Petrobras and the

    IFS.

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