发酵原料对虾酱品质和细菌多样性的影响Effect of Fermentation Ingredients on Quality and Bacterial Diversity of Shrimp Paste
黄爱莲,刘唤明,邓楚津,刘书成,钟赛意,洪鹏志,罗东辉
摘要(Abstract):
【目的】分析不同原料组成发酵虾酱的品质及细菌多样性,为虾酱的生产加工和品质提升提供理论依据。【方法】分别以凡纳滨对虾(Litopenaeus vannamei)虾头、中国毛虾(Acetes chinensis)和两者等质量混合为原料发酵虾酱(分别记为虾头虾酱、毛虾虾酱、混合虾酱),通过测定感官、氨基酸态氮(AAN)含量、挥发性盐基氮(TVB-N)含量、pH和细菌多样性等指标,分析不同原料组成发酵对虾酱品质和细菌多样性的影响。【结果】3种虾酱的AAN质量分数在1.04%~1.09%,且混合虾酱含量最高(P <0.05);TVB-N质量分数在27.30~32.55 mg/100g;pH在7.76~8.14;3种虾酱总游离氨基酸质量分数分别为9 243.24、9 944.19、7 529.37μg/g。电子舌结果显示,在鲜味强度上,虾头虾酱显著优于毛虾虾酱,混合虾酱鲜味强度稍低于虾头虾酱却优于毛虾虾酱;苦涩味强度方面,虾头虾酱最高,毛虾虾酱苦涩感最弱,混合虾酱苦涩值与毛虾虾酱相近且显著低于虾头虾酱;细菌群落分析表明,在门水平上,3种虾酱样品中,均以厚壁菌门、放线菌门和变形菌门为优势菌门;在属水平上,虾头虾酱以白色杆菌属(Leucobacter)、棒状杆菌属(Corynebacterium)和链球菌属(Streptococcus)为主;毛虾虾酱以假单胞菌属(Pseudomonas)和发光杆菌属(Photobacterium)为主;混合虾酱以白色杆菌属、类诺卡氏菌属(Nocardioides)和链球菌属为主。Pearson相关性分析表明,白色杆菌属、棒状杆菌属、链球菌属、假单胞菌属相对丰度与理化指标存在显著相关性,说明其在虾酱中发挥重要作用。【结论】不同原料组成会影响虾酱的品质和细菌多样性,混合原料发酵的虾酱产品蛋白质水解程度更高、氨基酸组成更平衡、感官品质更优、细菌多样性丰度增加,在提升虾酱品质方面具有一定的优势。
关键词(KeyWords): 虾酱;发酵原料组成;品质;细菌多样性
基金项目(Foundation): 2022年省科技创新专项资金(“大专项+任务清单”,SDZX2022038);; 2023年省科技创新专项资金(“大专项+任务清单”,SDZX2023029);; 国家虾蟹产业技术体系(CARS-48)
作者(Author): 黄爱莲,刘唤明,邓楚津,刘书成,钟赛意,洪鹏志,罗东辉
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