咖啡討論 - 咖啡
By James
at 2004-08-12T22:30
at 2004-08-12T22:30
Table of Contents
※ 引述《subman ()》之銘言:
: ※ 引述《xiffa (xiffa)》之銘言:
: 喔,另外一個問題也是要請教jordan兄的...
: 我如果沒記錯的話,
: [咖啡大全]好像把單寧(tannin)和綠原酸(chlorogenic acid)當作是同一種化合物,
: 我自己是覺得怪怪的,但也不是很確定,
: 還請"化學j博士"幫忙解說一下,
: 多謝啦 :)
應該說單寧(tannins)是一類化合物....定義為
1.oligomeric compounds with multiple structure units with free phenolic groups
2.molecular weight ranging from 500 to >20,000
3.soluble in water, with exception of some high molecular weight structures,
ability to bind proteins and form insoluble or soluble tannin-protein complexes
而chlorogenic acid有可能是其中一種(不確定)
因為第三點後面蠻重要的.....
有興趣的就自己看
tannins:http://www.ansci.cornell.edu/plants/toxicagents/tannin/chemical.html
chlorogenic acid:
http://www.chemistry.org/portal/a/c/s/1/
acsdisplay.html?DOC=HomeMolecule%5Carchive%5Cmotw_chlorogenicacid_arch.html
----
我是化學碩士....不是博士....><
農學學士
化學碩士
材料....博士(希望)
----
--
: ※ 引述《xiffa (xiffa)》之銘言:
: 喔,另外一個問題也是要請教jordan兄的...
: 我如果沒記錯的話,
: [咖啡大全]好像把單寧(tannin)和綠原酸(chlorogenic acid)當作是同一種化合物,
: 我自己是覺得怪怪的,但也不是很確定,
: 還請"化學j博士"幫忙解說一下,
: 多謝啦 :)
應該說單寧(tannins)是一類化合物....定義為
1.oligomeric compounds with multiple structure units with free phenolic groups
2.molecular weight ranging from 500 to >20,000
3.soluble in water, with exception of some high molecular weight structures,
ability to bind proteins and form insoluble or soluble tannin-protein complexes
而chlorogenic acid有可能是其中一種(不確定)
因為第三點後面蠻重要的.....
有興趣的就自己看
tannins:http://www.ansci.cornell.edu/plants/toxicagents/tannin/chemical.html
chlorogenic acid:
http://www.chemistry.org/portal/a/c/s/1/
acsdisplay.html?DOC=HomeMolecule%5Carchive%5Cmotw_chlorogenicacid_arch.html
----
我是化學碩士....不是博士....><
農學學士
化學碩士
材料....博士(希望)
----
--
Tags:
咖啡
All Comments
By Necoo
at 2004-08-15T01:47
at 2004-08-15T01:47
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