Darsning maqsadi:
Qon yoki oqsillar aralashmasi tarkibidagi gilkoproteidlarni
aniqlash va ularga xos sifat reaksiyalarini bajarish.
Nazariy qism.
Glikoproteidlar murakkab oqsillardir, ularning proteid guruhlariga
kiradi. Glikoproteidlar deyarli barcha to'qimalarda va tanadagi suyuqliklarda
uchraydi, birgalikda musinlar va mukoidlar deb ataladi va himoya funksiyalarini
bajaradi.
Material:
tuxum oqi.
Reaktivlar:
konsentrlangan H
2
SO
4
, 1% timol eritmasi, konsentrlangan CH
3
COOH.
Uskunalar:
probirkalar, tomchilar.
Ishni bajarish tartibi
Konsentrlangan sulfat kislota geksozalar yoki pentozalar bilan o'zaro aloqada
bo'lganda, ular suvsizlanadi: furfural pentozalardan, oksimetilfurfural esa
geksozalardan hosil bo'ladi. Ular kontsentrlangan sulfat kislota ishtirokida timol
yoki a-naftol bilan qizil kondensat mahsulotlarini beradi. Filtrlangan gidrolizatning
10 tomchisiga 2-3 tomchi 1% li timol eritmasi qo'shiladi, aralashtiriladi va
probirkaning devoriga 20 tomchi konsentrlangan sulfat kislota tomiziladi.
Chayqalganda, probirkaning timol bilan kondensatsiya hosil bo'lishi natijasida
probirkaning pastki qismida qizil rang hosil bo'ladi.
Ishni ro'yxatdan o'tkazish. Murakkab oqsillar bo'yicha ish natijalari jadvalda
keltiriladi.
Murakkab
oqsil nomi
Proteid
guruhining
kimyoviy
tuzilishi
Ishlatilgan
reaktivlar
Reaksiya
mahsulotlari
Reaksiya nima
sabab bo'ldi?
2-LABORATORIYA MASHG’ULOTI
QONDAGI GLIKOPROTEIDLARNI ANIQLASH.
A. Mashg’ulot davomida olingan xulosalar:
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B. Laboratoriya ishi bo’yicha nazorat savollari:
1. Oqsil gidrolizi nima va siz gidrolizning qaysi turlarini bilasiz?
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2.
Murakkab
oqsillarning
oddiy
oqsillardan
farqi
nimada?
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3. Murakkab oqsillarning tasnifini yozing. Gemoglobin murakkab oqsillarning qaysi
guruhiga kiradi va u qaysi tarkibiy qismlardan iborat?
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4. Glikoproteidlar nima va ularning uglevodlar guruhiga sifat reaktsiyalari qanday?
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5. Fosfoproteidlar nima va ularning reaktsiyasi yordamida qanday fosfor kislotasini
ochish mumkin? Fosforik kislota fosfoproteidlarning oqsil qismi bilan qanday
bog'liq?
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Talabaning ism familiyasi
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Guruhi ___________________
Sana: _____________________________
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