文章基本信息

标题：食品中で生成するソルビン酸の異性体について
本地全文：下载
作者：西山良子 ; 田村行弘 ; 井部明広等
期刊名称：Journal of Health Science
印刷版ISSN：1344-9702
电子版ISSN：1347-5207
出版年度：1991
卷号：37
期号：2
页码：89-96
DOI：10.1248/jhs1956.37.89
出版社：The Pharmaceutical Society of Japan
摘要：In HPLC analysis of foods to which sorbic acid is added as preservative, a peak of unknown substance is often observed before that of sorbic acid. Especially, the peak was observed very often in fish-paste products, Japanese pickles, foods boiled down in soy, pickles in vinegar and others. The rate of appearance exceeded 83% in the above foods. The structural analysis of this unknown substance was carried out with GC/MS, GC/FTIR, NMR. The mass spectrum of the unknown substance showed fragments ions at m/z 112 (M⁺), 97 (M⁺-Me), 67 (M⁺-CHO₂), 45 (CHO₂), 41 (CH₃-CH=CH-), the fragmentation pattern being nearly identical with that of sorbic acid (M⁺, 112). The ¹³C-NMR of the unknown substance showed one methyl carbon at δ14.120 (q), four olefin carbons at δ120.22 (d), δ127.32 (d), δ137.07 (d), δ141.47 (d) and one carboxyl carbon at δ172.62 (s). The ¹H-NMR showed one methyl proton at δ1.91, four olefin protons at δ5.87, δ6.00, δ6.19 and δ7.73. The following coupling constants due to olefilic protons were observed : J_{2, 3}=15.23 Hz (trans bond), J_{3, 4}=11.0 Hz and J_{4, 5}=11.0 Hz (cis bond), and J_{5, 6}=7.0 Hz and J_{4, 6}=1.5 Hz. From the above spectral data, the structure of the unknown substance was identified to be trans-2, cis-4-hexadienoic acid, a geometrical isomer of sorbic acid.
关键词：sorbic acid;food;geometrical isomer;structure determination;HPLC;GC/MS;NMR