P17la-fotokemija
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Transcript of P17la-fotokemija
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ffOToKOToKeeMiJMiJssKi Ki pROcESipROcESi
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ffOToKeMiJOToKeMiJssKE KE rrEAkCiJEAkCiJee• reakcije izazvanereakcije izazvane apSOrPCijoM SvJEtloStiapSOrPCijoM SvJEtloSti• fOTOsiNtEZafOTOsiNtEZa• pIGMeNTaCIJa kOŽepIGMeNTaCIJa kOŽe• ViDViD• FoTOgRAfiJAFoTOgRAfiJA• TVTV• pRoiZvodNjA bOjapRoiZvodNjA bOja
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• kVaNtkVaNt elektromagnetskog zračenjaelektromagnetskog zračenja
E = hE = h = = hc/hc/
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near UV region 200 do 400 nm;
750nm 380nm
c
hhE
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fOToKeMiJafOToKeMiJa
•proučava interakcije svjetla i tvari•utjecaj vidljivog i UV zračenja
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DeAktivAcija pObuđeNe moLeKule• A) NeRAdIJaCIJsKiM PrOCeSOm
– termalna degradacija energije• b) RADiJaCijSkiM pRoCeSoM
– reemisija svjetlosti– fluorescencija → fluorimetrija– klorofil
• C) foToKeMIJsKom rEaKCijOm– reakcija mora biti brža od bilo kojeg drugog oblika
deaktivacije pobuđene molekule
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PriMaRno i uKUpNo KvaNTno iSkoRišTeNJe
• pRiMarNa fOtoKEmiJsKa rEakcIJa:
=
• sEkUNdaRnE ReaKciJE:
=
broj proreagiranih molekulabroj apsorbiranih fotona
broj molekula produkatabroj apsorbiranih fotona
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• fOTOsINtEzA
• jedna od najvažnijih i najpoznatijih fotokemijskih reakcija
• klorofil• sinteza šećera iz ugljik dioksida
i vode uz svjetlost
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• Nastanak svjetlosti u nekim bioluminescentnim organizmima posljedica je pretvorbe kEmijSke eNergiJe u sVjeTlosNu eNeRgijU.
• nEKe GljiVe I BaKTerIJe – kontinuirano emitiranje svjetlosti
• DiNofLaGelAti (skupina morskih algi) – diskontinuirano emitiranje svjetla
• krijesnicekrijesnice
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• LuCiFeRiN• OkSiLuCiFeRiN• enzim: LuCiFeRaZa
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PrOceS viDa
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• ffLLuuOROReeSCSCeeNCNCIJaIJa
• FoFoSSffOROReeSSccEEnCIJanCIJa
• fluoroforifluorofori• planarne, rigidne planarne, rigidne
molekulske strukturemolekulske strukture
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• fluorimetrija• kvantitativna i kvalitativna analiza
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Fluorescentna mikroskopija
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ELISAenzyme-linked immunosorbent assay
•didijjagnostiagnostičkički laborator laboratorijskiijski test test•antitijelo - antigenantitijelo - antigen•antitijelo + enzim koji cijepa supstrat antitijelo + enzim koji cijepa supstrat → → fluorescentni produktfluorescentni produkt
•DNA sekvenciranje
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fOREnZikAluminol
• Luminol je organski spoj koji u oksidiranom stanju emitira svjetlo – KEMILUMINESCENCIJA.
Rezonancijom stabilizirani dianion (1) se oksidira iz vodikov peroksid u dikarboksilatni ion (2), uz gubitak N2. Kad nastane molekula 2, ona je u ekscitiranom stanju.
Emitiranjem fotona svjetlosti (425 nm), molekula se vraća u osnovno stanje (3).
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• krv• hemoglobin • ioni željeza• oksidacija luminola
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• 5-Amino-2,3-dihydro-1,4-phthalazinedione
• o-Aminophthaloyl hydrazideo-Aminophthalyl hydrazide
• 3-Aminophthalhydrazide3-Aminophthalic hydrazide