期刊
FOOD CHEMISTRY
卷 194, 期 -, 页码 1108-1115出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2015.08.077
关键词
Astaxanthin; Stability; Degradation; Fatty acid esterification; Autoxidation; UHPLC-PDA-ESI-MS
资金
- FeyeCon DI
- NL Agency
- Ministry of Education, Culture and Science [FND09014]
Fatty acid esterification, common in naturally occurring astaxanthin, has been suggested to influence both colour stability and degradation of all-trans-astaxanthin. Therefore, astaxanthin stability was studied as influenced by monoesterification and diesterification with palmitate. Increased esterification decelerated degradation of all-trans-astaxanthin (RP-UHPLC-PDA), whereas, it had no influence on colour loss over time (spectrophotometry). This difference might be explained by the observation that palmitate esterification influenced the cis-trans equilibrium. Free astaxanthin produced larger amounts of 9-cis isomer whereas monopalmitate esterification resulted in increased 13-cis isomerization. The molar ratios of 9-cis:13-cis after 60 min were 1:1.7 (free), 1:4.8 (monopahnitate) and 1:2.6 (dipalmitate). The formation of 9-cis astaxanthin, with its higher molar extinction coefficient than that of all-trans-astaxanthin, might compensate for colour loss induced by conjugated double bond cleavage. As such, it was concluded that spectrophotometry is not an accurate measure of the degradation of the all-trans-astaxanthin molecule. (C) 2015 Elsevier Ltd. All rights reserved.
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