13.08.2018 Views

HÓA HỌC THỰC PHẨM - CHƯƠNG 2 - LIPID - TÔN NỮ MINH NGUYỆT

https://app.box.com/s/g4qyofxufobwx91enhuou5skauo5nvqa

https://app.box.com/s/g4qyofxufobwx91enhuou5skauo5nvqa

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

5. Chæ soá Peroxyde - PoV<br />

ÑAÙNH GIAÙ CHAÁT LÖÔÏNG DAÀU BEÙO<br />

Ñònh nghóa: soá g Iod giaûi phoùng khi cho KI taùc duïng vôùi peroxyd<br />

trong 100g cbeùo<br />

YÙ nghóa:<br />

Nguyeân taéc:<br />

ñaùnh giaù möùc ñoä bò oxy hoùa cuûa chaát beùo<br />

R 1<br />

CH CH R 2 + 2KI +CH 3<br />

COOH R 1<br />

CH CH R 2<br />

O O<br />

O<br />

+ H 2<br />

O + I 2 + CH 3<br />

COOH<br />

2Na 2 S 2 O 3 + I 2 2NaI + Na 2 S 4 O 6<br />

Tieán haønh: hoøa tan maãu trong dung moâi chloroform vaø aacetic<br />

cho phaûn öùng vôùi KI baõo hoøa vaø<br />

ñònh phaân I 2 taïo thaønh baèng Na 2 S 2 O 3<br />

72

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!