Farmed large yellow croaker fish have stronger fishy smell and less tender texture than wild-caught ones, mostly caused by the high fat accumulation from aquaculture feeding patterns. To improve the commercial value of fillets, this study investigated a mild subcritical fluid treatment with subcritical butane (SBE) and dimethyl ether (SDME). Changes in the chemical compositions, volatile flavor compounds (VFCs) and protein denaturation were determined for 1–5 h treatments. The results showed 24 % and 44 % defatting levels under SBE and SDME treatment, respectively. GC-MS showed that SDME could induce a significant reduction of total VFC content, especially for the dominant aldehydes. There was less n-nonanal (14.65–40.13 mg/kg) and octanal content (1.67–7.21 mg/kg), no detection of trans, trans-2,4-decadienal in the SDME treated samples in comparison to those treated with SBE. The results showed that SDME treatment for 3 h had the best defatting effect, good deodorization effect and less degradation of fish protein.

中文翻译：

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温和亚临界流体处理对养殖大黄鱼肉品质的影响


养殖大黄鱼的鱼腥味较野生大黄鱼重，肉质较野生大黄鱼不嫩，这主要是由于养殖饲养方式脂肪积累过多造成的。为了提高鱼片的商业价值，本研究研究了使用亚临界丁烷（SBE）和二甲醚（SDME）进行温和的亚临界流体处理。测定 1-5 小时处理后化学成分、挥发性风味化合物 (VFC) 和蛋白质变性的变化。结果显示，SBE 和 SDME 处理下的脱脂水平分别为 24% 和 44%。 GC-MS 显示 SDME 可以显着降低总 VFC 含量，尤其是主要醛类。与 SBE 处理的样品相比，SDME 处理的样品中正壬醛 (14.65–40.13 mg/kg) 和辛醛含量 (1.67–7.21 mg/kg) 较少，未检测到反式、反式-2,4-癸二烯醛。结果表明，SDME处理3 h​​脱脂效果最好，脱臭效果好，鱼蛋白降解少。