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1.
通过密度测定和DSC热分析,观测了超高分子量聚乙烯的辐射效应。实验结果表明:在吸收剂量0—1.13MGy范围内,密度随吸收剂量的增加而增大,熔化热和熔点也有所增加,特别是在低剂量范围内增加十分明显。以上结果都说明,超高分子量聚乙烯在辐照过程中,结晶在完善或有新的结晶形成 相似文献
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SUSANNA DE CORDT MARC HENDRICKX GEERT MAESMANS PAUL TOBBACK 《International Journal of Food Science & Technology》1992,27(6):661-673
Biphasic and nth-order models were tested as to their usefulness to fit experimental inactivation data of Bacillus licheniformis α-amylase, immobilized on glass beads, and were discussed with respect to their suitability to characterize the considered enzymic system as a time—temperature integrator (TTI) to evaluate heat processes. Both isothermal and non-isothermal inactivation experiments were carried out. Model (kinetic) parameters (rate constant k, activation energy EA and reaction order n) were estimated using a non-linear regression procedure. The results obtained, especially the activation energy of about 293 kJ mole–1 , indicated a potential use of this system as a TTI for heating processes in the temperature range of 96–108°C. 相似文献
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Maria G Corradini Mark D Normand Micha Peleg 《Journal of the science of food and agriculture》2006,86(5):785-792
Currently, the sterility of heat‐processed food and pharmaceuticals is assessed in terms of an F0 value, based on the equivalence of the heat treatment to an isothermal process at a reference temperature. This F0 value, however, has a meaning if, and only if, the inactivation kinetics of the targeted spores (or cells) follow a first‐order relationship and the temperature dependence of the D value, the reciprocal of the rate constant, is log‐linear. There is growing evidence that these conditions are not satisfied by many spores, including those of Clostridium botulinum and vegetative cells. Consequently, a replacement for the F0 value is proposed in the form of a momentary equivalent time at the reference temperature based on the actual survival pattern of the spores, which need not be log‐linear. This equivalent time can be calculated together with the theoretical survival ratio in real time, thus enabling an operator to monitor the lethality of ongoing industrial heat processes. The concept is demonstrated with published survival data of C. botulinum, for which the Weibullian and log‐logistic models served as primary and secondary models, respectively. The safety factor according to the proposed method is in the number of added minutes of processing, beyond the theoretical time needed to reduce the survival ratio of the targeted spores or cells to a level that would produce practical (or commercial) sterility. Copyright © 2006 Society of Chemical Industry 相似文献
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A new non-heating technique was developed for the sterilization of food stuff. Applying a roller compactor, ultra-high pressure sterilization has experimentally demonstrated its ability to sterilize dry powders, such as corn flour and Chinese herbs, with little quality deterioration. Also, the degree of food sterilization was found correlated well with the linear press forces between the rollers, roller gaps, and number of compaction passes. In comparison to the conventional high pressure sterilization technique, the new dry continuous processing method has the advantage of lower investment cost and is more versatile for sterilizing various food powders. 相似文献
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本文研究了国内尚属空白的碱式次氯酸镁(BMH)的制备方法,并对BMH的理化性质和杀菌效果进行了初步研究。 相似文献
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主要对中药丸微波烘干灭菌系统的工作原理进行了设计.论文给出了采用微波进行中药丸干燥灭菌的优点.系统主要由微波加热设备、物料输送系统、控制与检测系统、排湿系统等部分组成.详细介绍了微波对中药丸进行干燥灭菌的工作流程. 相似文献
10.
参芪花粉片生产工艺改进探究 总被引:1,自引:0,他引:1
常建勇 《河南工业大学学报(自然科学版)》2011,32(4):41-43,48
为了减少工艺流程、提高生产效率和产品质量,对参芪花粉片生产工艺的发酵法破壁和灭菌两个环节进行了研究与改进.采用75%的乙醇水溶液作为花粉破壁、制粒的润湿剂,同时又兼作灭菌剂,提出了采用有机溶剂加胶体磨的新工艺方法替代直接发酵法对花粉进行破壁.通过改进工艺,主要工艺由5步减少到4步,工时显著减少,灭菌效率显著提高,生产成本降低,产品的外观和品质得到了改善;并且新工艺可提高片剂的稳定性和有效成分的均匀度. 相似文献