两种常见海水鱼高温贮存过程中挥发性盐基氮和生物胺含量变化

棘头梅童鱼(Collichthys lucidus)和龙头鱼(Harpodon nehereus)是我国沿海常见的两种小型海水鱼, 常被作为水产动物饵料, 也可被人类食用。研究检测了这两种鱼在30℃下贮存48h 每隔6h 的挥发性盐基氮(T-VBN)和9 种生物胺(尸胺、腐胺、组胺、酪胺、5-羟色胺、亚精胺、精胺、多巴胺、章鱼胺)的含量变化, 并对这两种鱼的T-VBN 和生物胺含量与时间的相关性进行分析, 为水产品类饵料安全投喂和人类食品安全提供基础资料。结果表明: 两种鱼在相同贮存条件中T-VBN 和生物胺含量均存在一定差异。T-VBN 含量随着贮存时间的延长而逐渐增加, 棘头梅童鱼T-VBN 含量从0h 的8.19 mg/100 g 增加到48h 的568.05 mg/100 g,龙头鱼从0h 的13.16 mg/100 g 增加到48h 的361.34 mg/100 g, 棘头梅童鱼增长值显著高于龙头鱼(PPPP>0.05);多巴胺在两种鱼体内均未检测到。这两种鱼体内T-VBN、腐胺、尸胺、组胺、酪胺含量与时间的相关性均极其显著(P<0.01)。       

Internal structure and quality assessment of fresh truffle Tuber melanosporum by means of magnetic resonance imaging spectroscopy

Abstract

In the present article, magnetic resonance imaging spectroscopy (MRI) was used to study fresh black truffle, with the aim of elucidating the internal structure, the effects of fungal invasion, and physical changes occurring in post-harvest. MRI is a non-destructive and non-invasive analytical technique offering the almost unique opportunity of studying foodstuff while leaving it intact, without any sample preparation. The internal morphology and modifications induced by external agents (e.g. fungal invasion, diseases, dehydration) are some of the aspects addressed by means of this innovative analytical tool.