obtained from local
retail outlets were used subsequently as blind samples.
Transparent PE film, approximately 0.025 mm thick, was obtained from local markets. All of the reagents, chemicals, and solvents,
such as anhydrous ether, methanol, hexane, and potassium
hydroxide (KOH), were of analytical grade. The pure standards of
FAMEs and trielaidin (>99%) were obtained from Sigma–Aldrich
(Sigma–Aldrich Trading Co., Ltd., Shanghai, China)
obtained from localretail outlets were used subsequently as blind samples.Transparent PE film, approximately 0.025 mm thick, was obtained from local markets. All of the reagents, chemicals, and solvents,such as anhydrous ether, methanol, hexane, and potassiumhydroxide (KOH), were of analytical grade. The pure standards ofFAMEs and trielaidin (>99%) were obtained from Sigma–Aldrich(Sigma–Aldrich Trading Co., Ltd., Shanghai, China)
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