title: Changes in the profile of volatiles of canned coconut milk during storage.
abstract: The alteration of the profile of volatiles of canned coconut milk was monitored during storage at ambient temperature. Canned coconut milk was thermally processed (121 °C for 5 min), and then stored at ambient temperature (32 to 35 °C) for 6 mo. Volatile compounds were assessed monthly using direct solvent extraction (diethyl ether), followed by high-vacuum distillation and gas chromatography-mass spectrometry analysis. Six groups of compounds consisting of alcohols, aldehydes, ketones, acids, esters, lactones, and others were identified. Two stages of major changes in profile of volatiles were observed. The 1st occurred after 2 mo as indicated by a high abundance of alcohols, acids, and lactones. The 2nd was observed after 5 mo and corresponded to a large increase in lactones, short-chain free fatty acids, 3-methyl-2(5H)-furanone, and phenol. Acetic and butyric acids observed after 5 mo could contribute to the potential of off-odor development in the product as indicated by their high odor activity values. Lactones increased approximately 10-fold. Identification of 3-methyl-2(5H)-furanone indicated that Maillard reaction had occurred in conjunction with the development of a coconut, toffee-like, and caramel odor.
authors.affiliation: Dept. of Food Science and Technology, Faculty of Agro-Industry, Kasetsart Univ, 50 Ngamwongwan Rd., Ladyao, Chatuchak, Bangkok, 10900, Thailand.
authors.forename: Patcharaporn
authors.initials: P
authors.lastname: Tinchan
authors.forename: Yaowapa
authors.initials: Y
authors.lastname: Lorjaroenphon
authors.forename: Keith R
authors.initials: KR
authors.lastname: Cadwallader
authors.forename: Siree
authors.initials: S
authors.lastname: Chaiseri
mesh_terms: D000438:Alcohols / Q000032:analysis; D000447:Aldehydes / Q000032:analysis; D001628:Beverages / Q000032:analysis*; D003059:Cocos; D004952:Esters / Q000032:analysis; D005511:Food Handling / Q000379:methods; D057141:Food, Preserved / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D006358:Hot Temperature; D007659:Ketones / Q000032:analysis; D007783:Lactones / Q000032:analysis; D015416:Maillard Reaction; D009812:Odorants / Q000032:analysis; D013696:Temperature; D013997:Time Factors; D055549:Volatile Organic Compounds / Q000032:analysis*
chemical_list: D000438:Alcohols; D000447:Aldehydes; D004952:Esters; D007659:Ketones; D007783:Lactones; D055549:Volatile Organic Compounds
keywords: Maillard reaction; aroma compound; canned coconut milk; lipid oxidation; lipolysis