In the present context, the objective of this study was to synthesize and analyze the content of AA of macadamia protein and the impact of hydrogen ion concentration (pH) on AA composition. The determination of AA mai...In the present context, the objective of this study was to synthesize and analyze the content of AA of macadamia protein and the impact of hydrogen ion concentration (pH) on AA composition. The determination of AA mainly by cation-exchange chromatography was also investigated. Reproducible and reliable techniques for quantification and identification of AA usually require derivatization. However, techniques such as AA analyzer are composed of cation-exchange chromatography and other components can sideline the derivatization with significant accuracy. The present analysis revealed a higher concentration of essential amino acids especially acidic AA, Glu and Asp and basic AA, Arg than other AA in macadamia protein. The study constitutes first report of use of bubble chart for evaluation of AA and explaination of AAS. The results may elaborate that the degradation of AA of macadamia protein for extraction of pH 11 is caused by the impact of pH. Moreover, the nutritional values of AA present in macadamia protein could change for the better by adjusting pH of extraction.展开更多
In the present work, macadamia protein was enzymatic hydrolyzed to produce peptides which had abundant antioxidant activities. The relative antioxidant capacity was investigated through some in vitro models such as sc...In the present work, macadamia protein was enzymatic hydrolyzed to produce peptides which had abundant antioxidant activities. The relative antioxidant capacity was investigated through some in vitro models such as scavenging activity of DPPH radical, scavenging of ABTS<sup>+</sup> radical and evaluation of the total antioxidant capacity assay. Macadamia protein was characterized by methods of DEAE cellulose cation-exchange chromatography and SDS-PAGE. Besides, method of price graph was used to compare the difference and to investigate the connection between the actual and ideal antioxidant value of the hydrolysates, aiming to reduce this difference.展开更多
采用3种蛋白提取方法从澳洲坚果脱脂粉中提取得到3种分离蛋白,包括碱提酸沉澳洲坚果蛋白(alkalineextraction and acid precipitation extracted macademia protein isolate,MAPI)、三(羟甲基)氨基甲烷提取澳洲坚果蛋白(tris (hydroxyme...采用3种蛋白提取方法从澳洲坚果脱脂粉中提取得到3种分离蛋白,包括碱提酸沉澳洲坚果蛋白(alkalineextraction and acid precipitation extracted macademia protein isolate,MAPI)、三(羟甲基)氨基甲烷提取澳洲坚果蛋白(tris (hydroxymethyl) aminomethane extracted macademia protein isolate,MTPI)以及氯化钠提取澳洲坚果蛋白(sodium chloride extracted macadamia protein isolate,MSPI),并对其功能和构象进行比较研究。研究发现,在酸性pH值范围内MSPI比MAPI和MTPI有更高的溶解性,而在碱性pH值范围内恰好相反。MSPI比MAPI和MTPI具有更高的乳化活性指数。MAPI、MTPI和MSPI的蛋白质量分数分别为88.9%、80.3%和86.1%。十二烷基硫酸钠-聚丙烯酰胺凝胶电泳和氨基酸分析表明,3种分离蛋白具有相似的条带分布和氨基酸组成,但它们的条带强度和氨基酸数量不同。此外,与MAPI和MTPI相比,MSPI具有较高的表面疏水性、荧光强度和较小的粒度。场发射扫描电子显微镜结果表明,MSPI比MAPI和MTPI具有更多的由不同大小球状结构组成的颗粒。展开更多
文摘In the present context, the objective of this study was to synthesize and analyze the content of AA of macadamia protein and the impact of hydrogen ion concentration (pH) on AA composition. The determination of AA mainly by cation-exchange chromatography was also investigated. Reproducible and reliable techniques for quantification and identification of AA usually require derivatization. However, techniques such as AA analyzer are composed of cation-exchange chromatography and other components can sideline the derivatization with significant accuracy. The present analysis revealed a higher concentration of essential amino acids especially acidic AA, Glu and Asp and basic AA, Arg than other AA in macadamia protein. The study constitutes first report of use of bubble chart for evaluation of AA and explaination of AAS. The results may elaborate that the degradation of AA of macadamia protein for extraction of pH 11 is caused by the impact of pH. Moreover, the nutritional values of AA present in macadamia protein could change for the better by adjusting pH of extraction.
文摘In the present work, macadamia protein was enzymatic hydrolyzed to produce peptides which had abundant antioxidant activities. The relative antioxidant capacity was investigated through some in vitro models such as scavenging activity of DPPH radical, scavenging of ABTS<sup>+</sup> radical and evaluation of the total antioxidant capacity assay. Macadamia protein was characterized by methods of DEAE cellulose cation-exchange chromatography and SDS-PAGE. Besides, method of price graph was used to compare the difference and to investigate the connection between the actual and ideal antioxidant value of the hydrolysates, aiming to reduce this difference.
文摘采用3种蛋白提取方法从澳洲坚果脱脂粉中提取得到3种分离蛋白,包括碱提酸沉澳洲坚果蛋白(alkalineextraction and acid precipitation extracted macademia protein isolate,MAPI)、三(羟甲基)氨基甲烷提取澳洲坚果蛋白(tris (hydroxymethyl) aminomethane extracted macademia protein isolate,MTPI)以及氯化钠提取澳洲坚果蛋白(sodium chloride extracted macadamia protein isolate,MSPI),并对其功能和构象进行比较研究。研究发现,在酸性pH值范围内MSPI比MAPI和MTPI有更高的溶解性,而在碱性pH值范围内恰好相反。MSPI比MAPI和MTPI具有更高的乳化活性指数。MAPI、MTPI和MSPI的蛋白质量分数分别为88.9%、80.3%和86.1%。十二烷基硫酸钠-聚丙烯酰胺凝胶电泳和氨基酸分析表明,3种分离蛋白具有相似的条带分布和氨基酸组成,但它们的条带强度和氨基酸数量不同。此外,与MAPI和MTPI相比,MSPI具有较高的表面疏水性、荧光强度和较小的粒度。场发射扫描电子显微镜结果表明,MSPI比MAPI和MTPI具有更多的由不同大小球状结构组成的颗粒。
