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An evaluation of various direct
compression excipients using the
Gamlen Tablet Press GTP-1
Dipankar Dey PhD
Technical Manager
Gamlen Tableting Ltd
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Motivation: Tablet Formulation
• The modern tablet
needs to satisfy
numerous properties
that make it ‘Fit for
Purpose’
• Physicochemical
• Stability
• Manufacturing
Drug Substance
Excipients
Lubricant
Tablet
2
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Tablet Formulation Experimentation
• API availability
• Equipment
Our approach
• Milligram quantities of material
• Objective method
• Practical
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The Gamlen Tablet Press GTP-1• Ideal instrument
for formulation
development
• Bench top
computer
controlled
• Milligram
quantities of
material
• Dual mode-
tablet press and
strength tester
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Computer control
• Can be linked to any laptop or PC.
• Real time data recording.
• Force displacement curves.
• Ejection force.
• Fracture load of compact.
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Tablet tensile strength
• Most important
tablet physical
parameter
• Objective as it
takes into account
not only tablet
hardness but
tablet thickness
too
• Scaleable to
different size and
shapes of tablets
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Making valid comparisons
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Evaluating compressibility• Tensile
strength measured over a range of forces
• Enables ranking of formulations
• Example of DC v wet granulated blend
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Compressibility assessment
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Development of a DC paracetamol
tablet
Main experiments
Selection of 3 most compressible formulations
Preliminary experiments
10% paracetamol0.5% MgSt
8 x mannitol
2-x isomaltulose
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Methods
• 100g blends were made using a Turbula mixer
• 75mg round, flat faced 5mm tablets made at 5 different compression forces
• Tablets subjected to fracture, friability and disintegration testing
• Powder flow properties also tested
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Ejection stress calculation
dt
�� ��
���
ES= ejection stress (MPa)
F= ejection force (N)
d = diameter of tablet (mm)
t = thickness of tablet (mm)
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Preliminary experiments: Friability
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Screening
Parteck M200
Perlitol 200SD
Galen IQ721
L-HPC21
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Main expts: Friability
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Summary• Compressibility is a
useful approach to screen formulations
• GTP generates useful comparative data to help evaluate different grades of excipient and drug content
• A ‘Decision matrix’ is a useful way of visualizing the data
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Contact details
Dr Dipankar Dey
Gamlen Tableting Ltd.
Biocity Nottingham
Nottingham NG1 1GF UK
Tel: +44 7712 632735
Fax: +44 115 912 4278
Email: [email protected]
http://www.gamlen.co.uk