Comparison of Nutrient Compositions and Flavor Substances between Hard Clam Meretrix meretrix and Northern Quahog Mercenaria mercenaria
CHEN Suhua1, CHEN Aihua1, WU Yangping1, ZHANG Yu1, CAO Yi1, ZHANG Zhidong1, LI Qiujie2, SUN Xuefeng3
1. Jiangsu Institute of Marine Fisheries, Nantong 226007,China; 2. College of Fisheries and Life, Shanghai Ocean University,Shanghai 201306, China; 3. College of Marine Science and Engineering, Nanjing Normal University, Nanjing 201123, China
Abstract：To evaluate the nutritional value of hard clam Meretrix meretrix and northern quahog Mercenaria mercenaria, the contents of approximate compositions,fatty acids, free amino acids,nucleotides, inorganic ions and volatile flavor substances were comparatively detected and analyzed in the soft body of the same month old hard clam(shell length 20.66±3.24 mm) and northern quahog(shell length 29.70 ± 2.23 mm) under the same aquaculture environment using the conventional nutritional determination methods and mass spectrometry. Results showed that there was significantly lower content of crude fat in hard clam than that in northern quahog (P< 0.05), with the mximal content of PUFA in hard clam (45.57%), especially EPA (13.29 %) and DHA (11.48 %), higher than those in northern quahog, without significant difference in contents of adenylate (AMP), guanylate (GMP), and inosinate (IMP) between the two clams. The three nucleotides exhibited major taste impacts on the hard clam, while IMP of northern quahog did not make much contribution to its taste flavor. The inorganic ions were all found to be the major flavor contributors in the two clams, with significantly higher contents of Na+, Fe2+, Zn+, Cl-and PO43-in hard clam than those in northern quahog(P<0.05), and significantly higher contents of Ca2+ and K+ in northern quahog than those in hard clam (P<0.05). There were 29 kinds of flavor-active compounds detected from hard clam and 42 kinds from northern quahog, with the maximal contents of alcohols in these two clams, indicating that alcohols play important roles in the overall odor. The odorant activity value (OAV) of 1-octen-3-ol in northern quahog was significantly higher than that in hard clam, which smelled “earthly” with excessive content.It was found that hard clam and northern quahog both had high nutritional value, a bit better nutrients and flavor substances in hard clam than northern quahog.
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2023, Vol. 42 
