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含纳他霉素天然保鲜果蜡的制备与应 总被引:2,自引:0,他引:2
研究了不同助剂对紫胶保鲜蜡物理性能和纳他霉素对保鲜蜡抑菌性能的影响.确定了含纳他霉素的天然保鲜果蜡的生产工艺为:紫胶120 g/L、吗啉20 mL/L、丙二醇10 mL/L、氨水12 mL/L,乳化时间30 min,当温度降至60℃时加入0.6 g/L的纳他霉素.应用该保鲜果蜡贮藏的胡柚和锦橙,在温度为5~10℃,相对湿度为60%~65%条件下贮藏45 d,能较好地保持果实的外观,表面新鲜饱满,有光泽,品质好,与对照相比失重率降低70%,好果率提高65%. 相似文献
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通过不同浓度外源精胺脉冲负压渗透处理的方法,研究了外源精胺在保持菜豆贮藏品质方面的作用.结果表明:在温度(20±2)℃,相对湿度80%~85%贮藏条件下,经不同浓度(0、0.02、0.2、0.5、1.0 mmol/L)的外源精胺真空渗透处理后的菜豆,其贮藏品质均得到不同程度的保持.外源精胺不同处理可有效延缓菜豆腐烂和锈斑的发生,而且可以抑制菜豆失重率和豆荚切割力的增加,并使菜豆豆荚的可溶性固形物以及菜豆豆粒硬度和可溶性蛋白含量得以保持.不同浓度外源精胺处理效果比较表明,0.5 mmol/L精胺处理保持菜豆贮藏品质的效果最好,贮藏至第8天菜豆腐烂指数和锈斑指数分别比对照低68%和23%. 相似文献
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真菌固态载体预处理对不灭菌玉米秸秆降解的影响 总被引:1,自引:0,他引:1
采用云芝变色栓菌(Trametes versicolor)、色精木霉菌(Trichoderma chromospermum)、深绿木霉菌(Trichoderma atroviride)和云芝变色栓菌分别与色精木霉菌、深绿木霉菌的混合菌对干黄玉米秸秆进行真菌预处理。结果显示,真菌预处理不灭菌秸秆30 d后,木质纤维素的降解率几乎可以忽略,在不灭菌的环境中,接入的真菌对秸秆本身附着的微生物群落不能形成竞争优势,造成较低的木质素降解率。而云芝变色栓菌、色精木霉菌、深绿木霉菌以及云芝变色栓菌分别与色精木霉菌、深绿木霉菌的混合菌对灭菌秸秆预处理30 d后,木质素的降解率分别为34.0%、38.1%、38.1%、39.1%及40.3%。为降低秸秆的灭菌成本,将真菌预处理30 d后的灭菌秸秆作为真菌固态载体与不灭菌秸秆按照1∶9、1∶4及1∶1的干质量比混合培养30 d,结果显示,采用云芝变色栓菌分别与色精木霉菌和深绿木霉菌的混合菌固态载体预处理不灭菌秸秆,木质素降解率可达到30%~40%。因而,真菌固态载体可以较好地适应非灭菌环境并对秸秆中的木质素进行有效降解,是一种有效降低过程成本的预处理手段。 相似文献
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感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
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《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
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从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性,认为在缺水不可避免的情况下,对供水进行优化调度可以减小缺水带来的损失,产生较好的减灾效益,特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性,提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献
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