PDF(Pubmed)
Abstract：
Silaging can be used as preservation technology to valorize currently discarded raw material into protein hydrolysate on board deep-sea vessels. The aim of this study was to investigate the effect of sorting and raw material freshness on the quality and yield of protein hydrolysates obtained through silaging of saithe (Pollachius virens) viscera. Additionally, the effect of using acid-containing antioxidants was tested. Out sorting of the liver prior to silaging resulted in slightly higher hydrolysate yields. The hydrolysates with the highest protein contents were obtained from silages made from fresh raw materials (day 0), and the content decreased significantly after longer storage of the raw material (2-3 days at 4 °C). Storage of the raw material for 1 day did not affect the quality. However, a significantly higher degree of hydrolysis (DH), content of free amino acids (FAA), and total volatile basic nitrogen (TVB-N) were obtained when raw materials were stored for 3 days. The FAA composition was influenced by the raw material\'s freshness, with increases in free glutamic acid and lysine and a decrease in free glutamine after longer storage. None of the studied parameters were significantly affected by out sorting of liver or the addition of antioxidants. Overall, the results indicate that the whole fraction of the viscera can be utilized without reducing the quality of the hydrolysate and that the raw material should be stored for a maximum of 1 day prior to preservation to optimize the quality.
摘要：
青贮可作为保藏技术，在深海船舶上将目前废弃的原料转化为蛋白质水解物。这项研究的目的是研究分选和原料新鲜度对通过西氏（Pollachiusvirens）内脏青贮获得的蛋白质水解产物的质量和产量的影响。此外,测试了使用含酸抗氧化剂的效果。在青贮之前对肝脏进行分选导致水解产物产率稍高。蛋白质含量最高的水解产物是从新鲜原料制成的青贮中获得的（第0天），并且在原料的较长时间储存（在4°C下2-3天）后，含量显着下降。原料储存1天不影响质量。然而,明显更高的水解度(DH)，游离氨基酸含量（FAA），和总挥发性碱性氮(TVB-N)在原料储存3天后获得。FAA成分受原材料新鲜度的影响，随着游离谷氨酸和赖氨酸的增加和游离谷氨酰胺的减少，长期储存后。所研究的参数均未受到肝脏分选或添加抗氧化剂的显着影响。总的来说,结果表明，可以利用内脏的整个部分，而不会降低水解产物的质量，并且原料应在保存前最多储存1天，以优化质量。
