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Nutritional evaluation of caseins and whey proteins and their hydrolysates from Protamex 总被引:4,自引:0,他引:4
夏文水 《Journal of Zhejiang University. Science. B》2006,7(2):90-98
Whey protein concentrate (WPC 80) and sodium caseinate were hydrolyzed by Protamex to 5%, 10%, 15%, and 20% degree of hydrolysis (DH). WPC 80, sodium caseinate and their hydrolysates were then analyzed, compared and evaluated for their nutritional qualities. Their chemical composition, protein solubility, amino acid composition, essential amino acid index (EAA index), biological value (BV), nutritional index (NI), chemical score, enzymic protein efficiency ratio (E-PER) and in vitro protein digestibility (IVPD) were determined. The results indicated that the enzymatic hydrolysis of WPC 80 and sodium caseinate by Protamex improved the solubility and IVPD of their hydrolysates. WPC 80, sodium caseinate and their hydrolysates were high-quality proteins and had a surplus of essential amino acids compared with the FAO/WHO/UNU (1985) reference standard. The nutritive value of WPC 80 and its hydrolysates was superior to that of sodium caseinate and its hydrolysates as indicated by some nutritional parameters such as the amino acid composition, chemical score, EAA index and predicted BV. However, the E-PER was lower for the WPC hydrolysates as compared to unhydrolyzed WPC 80 but sodium caseinate and its hydrolysates did not differ significantly. The nutritional qualities of WPC 80, sodium caseinate and their hydrolysates were good and make them appropriate for food formulations or as nutritional supplements. 相似文献
13.
通过对小白鼠内服叠氮钠进行急性毒性试验和蓄积毒性试验测出了叠氮钠的半数致死量(LD50)35.81mg/Kg,为剧毒物质和在动物机体内的蓄积系数K值为3.25,属于中等程度蓄积,并通过对蓄积毒性试验死亡的小白鼠进行解剖,肉眼可见肝脏有点状坏死灶,提示叠氮钠对肝脏有明显的损伤作用,而其它组织如:肾脏、脾脏、肺脏、胃肉眼观察则无明显的病理变化. 相似文献
14.
本实验采用累积给药法,以偏钒酸钠(NaVo3)灌流蟾蜍心室肌条,观察NaVo3对心室肌功能性不应期(FRP)和兴奋性的影响。结果:10—160μmol·L-1浓度的NaVo3不同程度地延长心室肌FRP,当灌流液NaVo3浓度为80μmol·L-1时,心室肌FRP的廷长与对黑浓度呈现显茗性差异(P<0.05),NaVo3浓度为160μmol·L-1时,其差异更显著(P<0.01)。NaVo3浓度为40μmol·L-1和80μmol·L-1时,显著提高心室肌的兴奋性。 相似文献
15.
《文物保护研究》2013,58(4):227-236
AbstractThis article compares chemical dechlorination treatments (immersion in sodium hydroxide or alkaline sulphite) and electrochemical treatments of iron bars from the Gallo-Roman period excavated from a marine environment. Some important parameters, such as storage before treatment, temperature, solution composition, and drying after treatment, were varied during the study to assess their influence on the chloride extraction process. The kinetics of these treatments depend mainly on chloride diffusion through the corrosion layers. The kinetics are promoted by high temperatures and, in the case of electrolysis, by the electric field effect. The reduction of corrosion products during electrolysis occurs only for objects previously stored in air. In fact, the manner in which the objects are stored before treatment is critical in the dechlorination processes. The sooner the objects are treated after excavation (with water storage), the better the removal of chloride ions, in both chemical immersion and electrolysis treatments. But if the object is stored in air, material losses occur, and only electrolysis results in complete extraction of the chlorides. These differences are due to modifications in the corrosion products during storage. Drying after treatment also has a significant impact on the composition of the corrosion layers. If the objects are dried too quickly, Fe(OH)2 oxidizes into FeOOH, which thus forms a layer with low cohesion. 相似文献
16.
目的:评价注射用头孢唑肟钠制剂用药的安全性。方法:按照国家SFDA颁发的《化学药物刺激性、过敏性和溶血性研究技术指导原则》进行了局部血管刺激性、肌肉刺激性、溶血性和全身主动过敏性试验。结果:①注射用头孢唑肟钠耳缘静脉点滴给药浓度为0.04g/ml,给药容积为2ml/kg时,对试验兔血管无刺激性;②注射用头孢唑肟钠肌肉注射给药浓度为0.25g/ml,给药容积为0.5ml/只时,对试验兔肌肉无刺激性;③注射用头孢唑肟钠药物浓度为0.04g/ml,在体外试验条件下无溶血反应及红细胞凝聚反应;④注射用头孢唑肟钠致敏剂量为0.067和0.133g/kg,激发剂量为0.067和0.133g/kg时,对豚鼠无主动全身过敏性反应。结论:注射用头孢唑肟钠试验条件下无血管和肌肉刺激性、无溶血性及过敏性反应。 相似文献
17.
碳酸氢钠对人体运动能力的影响 总被引:3,自引:0,他引:3
通过对三种不同供能形式为主的运动项目运动员服用碳酸氢销后对运动成绩和某些生理生化指标的影响方面的研究进行综述和分析,揭示了服用碳酸氢钠诱导碱中毒对运动能力影响的机制。证实了口服一定剂量的碳酸氢钢有助于提高机体以乳酸能系统供能为主的运动项目的成绩。 相似文献
18.
NH4Cl和NaNO2在一定条件下反应产生大量的热和气体,利于蜡的熔化和剥离,只有掌握它的反应动力学特征,了解它的最佳反应条件及其影响因素,才能更好的利用其热量。本文通过测量不同条件下两者反应生成气体和温度的变化量,计算出各种相关的动力学参数,得到该反应的动力学方程。 相似文献
19.
张寅 《山东教育学院学报》2012,27(5):33-37
金属氧化物沉积法(MOD)成功地制备了Bi1/2Na1/2TiO3(NBT)基无铅压电陶瓷,样品的X射线衍射(XRD)结果显示其具有较好的结晶性,通过介电温度谱和介电弥散性指数δ、介电临界指数γ和频率色散度△Tm对样品的驰豫性质进行了定量研究,结果表明,NBT是一种A位取代的驰豫铁电体,它具有钙钛矿结构,以及极其复杂的相变过程,在一定的温度范围内可以得到三方和四方共存的准同型相界区。 相似文献
20.