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Comparison of Gender Differences in Nutritional Value and Key Odor Profile of Hepatopancreas of Chinese Mitten Crab (Eriocheir Sinensis)

Research paper by Na Wu, Xi‐Chang Wang

Indexed on: 25 Jan '17Published on: 24 Jan '17Published in: Journal of Food Science



Abstract

The nutritional value and key odor profile of hepatopancreas of Chinese mitten crab (Eriocheir sinensis) was evaluated, and gender differences in terms of edible yield, proximate composition, different lipid fractions, fatty acid composition, and key odor compounds were compared. Total lipids were separated into different lipid fractions using silicic acid columns. And odorants were detected by monolithic material sorptive extraction coupled with gas chromatography-mass spectrometry-olfactometry (GC-MS-O). Furthermore, detected frequency and odor intensity method of GC-O were applied to select key odor compounds in steamed E. sinensis. The results showed male crabs (34.06%) had a higher edible yield than female crabs (32.42%). Hepatopancreas was the most abundant portion in both genders, which contained high lipid content. Higher contents of triacylglycerols, sterols, free fatty acids, and phosphatidylethanolamine in female crabs resulted in a significant higher total lipid content in females (40.05%) than in males (37.94%). Meanwhile, total monounsaturated fatty acids and polyunsaturated fatty acids of female crabs had significant higher content than male crabs, and the ratio of docosahexaenoic acid to eicosapentaenoic acid of female crabs (1.26) showed higher value than male crabs (1.18), which indicated that female crabs had higher nutritional value than male crabs. For further analyses, unique odor compounds detected in female crabs showed a plant/vegetable-like odor, while sweety, corn-like odor in male crabs. These suggested that hepatopancreases of female crabs are healthier than male crabs for human consumption, however, they may be favored by different consumers individually due to their unique aroma profiles.The nutritional value and key odor profile of hepatopancreas of Chinese mitten crab (E. sinensis) was evaluated, and crab gender differences in terms of edible yield, proximate composition, different lipid fractions, fatty acid composition, and key odor compounds were compared. This study suggested that hepatopancreases of female crabs are healthier than male crabs for human consumption, however, they may be favored by different consumers individually due to their unique aroma profiles. For further processing, hepatopancreas of female crabs could be regarded as a healthier material than male crabs.