Analysis for sensory quality,nutrients and volatile organic compounds of four swim bladders
To investigate the difference in the sensory quality,nutrients and volatile organic compounds(VOCs)of swim bladders,the color(L*,a*,b*),basic nutrients(moisture,protein,fat,ash,mineral ele-ments and collagen content),amino acids and VOCs of four swim bladders with longsnout catfish,stur-geon,bulk freshwater fish and yellow croaker were determined by using automatic amino acid analyzer,gas chromatography-ion mobility spectroscopy(GC-IMS)and inductively coupled plasma source mass spec-trometer(ICP-MS),etc.The results showed that among four swim bladders,the L*value of swim bladder with sturgeon was the highest,while that of longsnout catfish was the lowest;the a*value of swim bladder with longsnout catfish was the highest,and that of bulk freshwater fish was the lowest;the b*value of four swim bladders were not significantly different.The best shape and elasticity of swim bladder with long-snout catfish was maintained after cooking.The swim bladder with bulk freshwater fish had the highest moisture content(17.7％),and the swim bladder with longsnout catfish had the highest collagen content(0.62 g/g),while the swim bladder with longsnout catfish had the highest fat and ash contents,which was 0.86％and 0.60％,respectively.There were nonsignificant differences in protein content among four swim bladders,ranging from 86.79％to 88.65％.The calcium,iron and zinc contents of swim bladder with yellow croaker was higher than others.The dominant amino acids of four swim bladders were glutamic acid,glycine,proline and arginine,respectively.The VOCs with four swim bladders mainly included esters,aldehydes and alcohols,while the swim bladder with bulk freshwater fish had higher concentration of VOCs than others.These results indicated that the swim bladder was a kind of high-nutrition aquatic food,and the sensory quality,nutrients and VOCs of swim bladder from various sources had significant differences.Ana-lyzing characteristics of four swim bladders may provide scientific guidance for deep-processing and market selection.
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