鲢鱼源多肽锌螯合物对冷藏草鱼的保鲜作用

Effect of complexes of Zn^(2+) and peptides from silver carp(Hypophthalmichthys molitrix) proteins on the preservation of grass carp during cold storage

研究了鲢鱼源多肽锌螯合物对冷藏草鱼的防腐保鲜作用。以感官评分、硫代巴比妥酸(TBA)、挥发性盐基氮(TVB-N)、pH和细菌总数为检测指标,评价经多肽锌等不同条件处理的草鱼在冷藏过程中的品质变化情况。结果表明,多肽锌对冷藏过程中的草鱼有明显的防腐保鲜作用,能减缓草鱼感官品质的下降,有效抑制草鱼TBA值、TVB-N值、pH值的升高以及细菌的生长,与未添加多肽锌的涂膜处理组草鱼相比,经40 mg锌/kg剂量的多肽锌处理后草鱼的保鲜期可以延长4 d。因此,鲢鱼源多肽锌螯合物可以作为潜在的水产品保鲜剂。

Fe78Si13B9 magnetic amorphous powder was prepared by high-energy ball-milling and then was consolidated in several solid sample at different sintering temperature by spark plasma sintering technology. The phase composition, glass transition temperature （Tg）, onset crystallization temperature （Tx） and peak temperature （Tp） of Fe78Si13B9 amorphous alloy powders were analyzed by XRD and DSC. The phase transition, microstructure, mechanical properties and magnetic performance of the bulk alloys in different sintering temperature were discussed by XRD, SEM, and vibration sample magnetometer, etc. It is found that with the increase of the sintering temperature at the pressure of 500 MPa, the amorphous phase begins to crystallization gradually and the density, compressive strength, micro-hardness and saturation magnetization of the sintering sample improve significantly. The desirable amorphous nanocrystalline magnetic material at the sintering temperature of 823.15 K and under the pressure of 500 MPa has a density of 6.6 g/cm3, compressive strength of 1500 MPa and a saturation magnetization of 1.3864 T.