Lipases have been widely applied in a variety of industrial fields,such as food,pharmaceuticals,biofuels,and biotechnology.Recent years have witnessed a great interest in modifying lipids for the production of triacyl...Lipases have been widely applied in a variety of industrial fields,such as food,pharmaceuticals,biofuels,and biotechnology.Recent years have witnessed a great interest in modifying lipids for the production of triacylglycerols enriched with n-3 polyunsaturated fatty acids(PUFAs).Here,a novel salt-tolerant,organic solvent-stable,and bile salt-activated lipase was purified from golden pompano(Trachinotus ovatus)viscera,which was named as golden pompano lipase(GPL).GPL had a specific activity of 57.2U mg^(-1)with an estimated molecular weight of 14 k Da,exhibited optimal activity at 40℃a nd pH 8.0,and showed K_(m)and V_(max)of 40.16μmol L^(-1)and 769.23μmol L^(-1)min^(-1),respectively.GPL activity was enhanced by Mn^(2+)and sodium deoxycholate.It was active in organic solvents,including methanol,ethanol,chloroform,and hexane.GPL also showed a good salinity tolerance of up to 1 mol L^(-1).n-3PUFA enrichment in the glyceride fraction of golden pompano oil was performed by GPL-catalyzed hydrolysis and yielded a total PUFA concentration of 56.99%.EPA,DHA,and DPA were enriched by 10.4-,3.2-,and 1.8-fold of their initial levels,respectively.This study recognized the industrial applicability of GPL to prepare enriched C_(20-22)n-3 PUFA.展开更多
以金鲳鱼为原料,接种混合乳杆菌进行短时发酵,以总酸含量、总挥发性盐基氮(total volatile base nitrogen,TVB-N)含量和感官评分为评价指标,通过单因素和响应面优化短时发酵金鲳鱼片的加工工艺,并结合高通量测序揭示在短时发酵过程中的...以金鲳鱼为原料,接种混合乳杆菌进行短时发酵,以总酸含量、总挥发性盐基氮(total volatile base nitrogen,TVB-N)含量和感官评分为评价指标,通过单因素和响应面优化短时发酵金鲳鱼片的加工工艺,并结合高通量测序揭示在短时发酵过程中的真菌群落的变化规律。结果表明,短时发酵金鲳鱼片的最佳发酵工艺为NaCl含量6%、腌制时间1 h、烘制温度55℃、烘制时间58 min、菌种添加量8%、发酵温度35℃、发酵时间25 h。门水平上主要是担子菌门(Basidiomycota)和子囊菌门(Ascomycota),它们在发酵不同阶段占据主导地位,体现真菌群落的演替性。属水平上毛孢子菌属(Trichosporon)相对丰度迅速增加,成为发酵中后期的优势真菌属。真菌多样性分析ITS序列结果表明,随着发酵时间的延长,真菌群落多样性和丰富度均下降,说明发酵环境抑制部分真菌的生长繁殖,发酵过程改变真菌的群落多样性与结构,发酵鱼品质的形成与微生物的活动密不可分。展开更多
为提高金鲳鱼加工副产物——鱼皮的利用率,本研究在前期单因素实验的基础上,以加酶量、液料比和提取时间三个单因素建立模型,采用响应面法Box-Behnken设计实验,优化了胃蛋白酶法提取金鲳鱼鱼皮酶溶性胶原蛋白(PSC)的提取工艺,并与酸溶...为提高金鲳鱼加工副产物——鱼皮的利用率,本研究在前期单因素实验的基础上,以加酶量、液料比和提取时间三个单因素建立模型,采用响应面法Box-Behnken设计实验,优化了胃蛋白酶法提取金鲳鱼鱼皮酶溶性胶原蛋白(PSC)的提取工艺,并与酸溶性胶原蛋白(ASC)进行聚丙烯酰胺凝胶电泳、傅里叶变换红外光谱和差示扫描量热仪等基本理化特性的对比研究。结果表明,金鲳鱼鱼皮胶原蛋白的最佳提取工艺为:加酶量1.5%、液料比23∶1 m L/g、酶解时间27.5 h。此条件下通过实验验证得出,金鲳鱼鱼皮胶原蛋白实际提取率为64.68%,与响应面模型理论预测值65.17%基本一致;此外,本实验提取的PSC有较高热变性温度(30.44℃),与金鲳鱼皮ASC有相似的电泳性质和红外峰型,初步鉴定为I型胶原蛋白。该实验为金鲳鱼鱼皮酶溶性胶原的提取提供了理论参考。展开更多
基金This work was supported by the National Key R&D Programs of China(No.2018YFD0901103)the Program of the Hainan Association for Science and Technology Plans to Youth R&D Innovation(No.QCXM202003)the Hainan Provincial Natural Science Foundation of China(No.2019RC093).
文摘Lipases have been widely applied in a variety of industrial fields,such as food,pharmaceuticals,biofuels,and biotechnology.Recent years have witnessed a great interest in modifying lipids for the production of triacylglycerols enriched with n-3 polyunsaturated fatty acids(PUFAs).Here,a novel salt-tolerant,organic solvent-stable,and bile salt-activated lipase was purified from golden pompano(Trachinotus ovatus)viscera,which was named as golden pompano lipase(GPL).GPL had a specific activity of 57.2U mg^(-1)with an estimated molecular weight of 14 k Da,exhibited optimal activity at 40℃a nd pH 8.0,and showed K_(m)and V_(max)of 40.16μmol L^(-1)and 769.23μmol L^(-1)min^(-1),respectively.GPL activity was enhanced by Mn^(2+)and sodium deoxycholate.It was active in organic solvents,including methanol,ethanol,chloroform,and hexane.GPL also showed a good salinity tolerance of up to 1 mol L^(-1).n-3PUFA enrichment in the glyceride fraction of golden pompano oil was performed by GPL-catalyzed hydrolysis and yielded a total PUFA concentration of 56.99%.EPA,DHA,and DPA were enriched by 10.4-,3.2-,and 1.8-fold of their initial levels,respectively.This study recognized the industrial applicability of GPL to prepare enriched C_(20-22)n-3 PUFA.
文摘为提高金鲳鱼加工副产物——鱼皮的利用率,本研究在前期单因素实验的基础上,以加酶量、液料比和提取时间三个单因素建立模型,采用响应面法Box-Behnken设计实验,优化了胃蛋白酶法提取金鲳鱼鱼皮酶溶性胶原蛋白(PSC)的提取工艺,并与酸溶性胶原蛋白(ASC)进行聚丙烯酰胺凝胶电泳、傅里叶变换红外光谱和差示扫描量热仪等基本理化特性的对比研究。结果表明,金鲳鱼鱼皮胶原蛋白的最佳提取工艺为:加酶量1.5%、液料比23∶1 m L/g、酶解时间27.5 h。此条件下通过实验验证得出,金鲳鱼鱼皮胶原蛋白实际提取率为64.68%,与响应面模型理论预测值65.17%基本一致;此外,本实验提取的PSC有较高热变性温度(30.44℃),与金鲳鱼皮ASC有相似的电泳性质和红外峰型,初步鉴定为I型胶原蛋白。该实验为金鲳鱼鱼皮酶溶性胶原的提取提供了理论参考。
