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空化微射流對米糠蛋白熱聚集體結(jié)構(gòu)及特性的影響
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山東省重點研發(fā)計劃項目(2018YYSP026)


Effect of Cavitation Microjet on Structure and Properties of Rice Bran Protein Thermal Aggregates
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    摘要:

    以米糠蛋白為研究對象,采用加熱處理(pH值7.2、100℃、20min)制備熱可溶性聚集體,分別對熱聚集體進(jìn)行空化微射流(0、30、60、90、120MPa)處理,以未經(jīng)處理的可溶性米糠蛋白作為對照,探究空化微射流處理對可溶性米糠蛋白聚集體結(jié)構(gòu)特性(3D微觀結(jié)構(gòu)、粒徑分布、電位、表面疏水性、官能團(tuán)、二三級結(jié)構(gòu))和乳化特性(乳化性和乳化穩(wěn)定性)的影響。結(jié)果表明:與熱可溶性聚集體相比,經(jīng)過空化微射流處理(90MPa)后,3D微觀結(jié)構(gòu)高度和顆粒大小、總游離巰基含量、平均粒徑和β-折疊含量降到最低,結(jié)構(gòu)變得疏松;表面疏水性、乳化性指數(shù)及乳化穩(wěn)定性指數(shù)提高了798.05、90.32m2/g和281.68min。低壓(30~90MPa)處理減小了熱可溶性聚集體顆粒粒徑,將不溶性聚集體轉(zhuǎn)化為可溶性聚集體,使其乳化特性增大;而高壓(120MPa)處理則會使蛋白發(fā)生聚集,乳化特性降低。

    Abstract:

    The heat-soluble aggregates were prepared by heat treatment (pH value 7.2, 100℃, 20min),and the cavitation microjet of different pressures (0, 30MPa, 60MPa, 90MPa, 120MPa) were respectively applied to the thermal aggregates. Impacts of cavitation microjet treatment on structural characteristics (3D microstructure, molecular weight distribution, functional group, particle size, potential and hydrophobicity) and emulsifying properties (emulsification and emulsion stability) of soluble rice bran protein aggregate were investigated by using soluble rice bran protein as a control. The results showed that compared with the heatsoluble aggregates, 3D microstructure height and particle size, total free sulfhydryl content, the average particle size and β-sheet content were reduced to the lowest point after cavitation microjet treatment (90MPa), and the structure became loose;the surface hydrophobicity, emulsifying property and emulsion stability reached the maximum value, which was increased by 798.05, 90.32m2/g and 281.68min, respectively, compared with the heatsoluble aggregate. Low-pressure (30~90MPa) micro-jet treatment would reduce the hotsoluble aggregate particles, convert the insoluble aggregate into soluble aggregates, and increase the emulsifying properties, while high pressure (120MPa) would cause the protein to aggregate and the emulsifying properties would be slightly reduced.

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周麟依,王辰,王中江,劉軍,李汝恒.空化微射流對米糠蛋白熱聚集體結(jié)構(gòu)及特性的影響[J].農(nóng)業(yè)機(jī)械學(xué)報,2020,51(3):341-349. ZHOU Linyi, WANG Chen, WANG Zhongjiang, LIU Jun, LI Ruheng. Effect of Cavitation Microjet on Structure and Properties of Rice Bran Protein Thermal Aggregates[J]. Transactions of the Chinese Society for Agricultural Machinery,2020,51(3):341-349.

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  • 收稿日期:2019-09-09
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  • 在線發(fā)布日期: 2020-03-10
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