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高压静电场处理番茄贮藏保鲜试验 总被引:1,自引:0,他引:1
以番茄果实为材料,利用30,60,90kV/m高压静电场对番茄果实进行20,40,60min预处理,然后置于16℃左右的室温条件下贮藏,定期测定番茄的Vc含量、酸度、质量损失率等保鲜性能指标,研究了不同剂量的高压静电场对番茄的保鲜效果.试验结果表明,高压静电场处理能够很好地抑制番茄质量的损失和番茄果实Vc含量、酸度的变化,延迟了番茄果实腐败的发生.另外,利用60kV/m高压静电场处理60min,其果实Vc含量、果实质量损失率以及酸度的变化均小于其他处理,保鲜效果最好. 相似文献
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高压静电场处理黄冠梨的贮藏保鲜试验 总被引:1,自引:0,他引:1
以黄冠梨为材料,研究了20,60,100kV/m高压静电场处理对黄冠梨果实硬度、水分含量、酸含量和果实质量变化的影响.试验结果表明,高压静电场处理能很好地保持果实的含水量,抑制了黄冠梨果实硬度的变化,有效地控制了黄冠梨腐败的发生,延迟梨采后的衰老过程.在相同贮藏条件下,利用100kV/m高压静电场处理1h,对黄冠梨果实生化反应的抑制效果最好,其果实硬度、果实水分含量、酸度及质量损失率的变化均小于其他处理,保鲜效果最好. 相似文献
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为探讨高压静电场对水培番茄生理生化指标与产量的影响规律,阐明影响机理,将番茄幼苗放入平行板电极的2个极板间并施加2.00、2.25、2.50 k V/cm 3种不同强度的高压静电场8 h,然后将电场处理后的幼苗在温室采用无机基质和营养液模式培养,同时对茎粗、鲜质量、叶绿素含量、根系形态特征、生长期、膜透性、离子浓度变化和果实最终产量进行测试分析,结果表明:与不加电场的对照相比,营养液栽培高压静电场处理改变了番茄的生长特性,且强度为2.25 k V/cm的电场对茎粗、鲜质量、叶绿素含量、根系形态的促进效果最优,基质栽培中2.25 k V/cm的电场处理后产量提高了23%。 相似文献
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不同浓度1-MCP处理对采后油木奈果实的保鲜效应 总被引:1,自引:0,他引:1
探讨了不同浓度1-MCP处理对采后油木奈果实保鲜效应的影响。采后油木奈果实分别用0、0.3、0.6、0.9和1.2μL/L的1-MCP处理12h后,在(25±1)℃下贮藏。贮藏期间测定果实呼吸强度、细胞膜相对渗透率、果实表面色调角h°和果皮叶绿素含量、果实硬度、可溶性固形物和可滴定酸含量、果实好果率、失重率及感官品质等指标的变化。结果表明:与对照果实相比,1-MCP处理都可降低油木奈果实呼吸强度和呼吸峰值,延缓果实细胞膜相对渗透率升高,抑制果实表面色调角h°下降,保持较高的果实硬度、可滴定酸和果皮叶绿素含量,延迟果实外观颜色转变,减少果实失重和腐烂;其中1.2μL/L 1-MCP处理12h的保鲜效果最佳,在(25±1)℃下贮藏20d时,果实好果率达87%,果实仍保持鲜绿色、果肉质地脆硬、果实酸甜适口、香气浓郁。 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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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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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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The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献