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小麦胚芽的微波在线稳定化试验 总被引:3,自引:1,他引:2
麦胚具有快速酸败变质的特性,为提高麦胚稳定性,利用研发的麦胚在线微波稳定化处理工艺和装备,选取不同微波功率和处理时间等工艺参数进行试验,研究不同条件对麦胚稳定化效果的影响.结果表明,采用微波功率2.8 kW、时间4 min处理的麦胚,在30 d加速贮藏后,脂肪酶相对酶活17.63%,过氧化值3.81 mmol/kg,酸价14.65 mg/g,VE损失率5.29%.氮溶解指数51.10%,含水率3.72%,脂肪酸组成和相对含量未产生明显变化.研究表明,该微波装备能与面粉生产线相配套,有效钝化麦胚脂肪酶,保持麦胚营养,延长保质期,且具有节能降耗的优点. 相似文献
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针对小麦胚芽快速酸败变质的特性,采用多层多室流化床装备对麦胚进行在线稳定化处理。
根据麦胚的性质和实际产量要求,将改良设计的多层多室流化床装备与面粉生产线连接,并
选取不同温度、风量等参数进行在线试验,研究流化床对麦胚的稳定化效果。结果表明,出
风温度45℃为稳定化处理麦胚的优化条件。处理后的麦胚VE损失628%,
氮溶解指数下降111%,脂肪酸组成和相对含量未产生明显变化。产品经30d加速贮藏,
过氧化值72mmol/kg,酸价1847mg/g。试验表明,该技术与装备已达到了麦胚稳定
化处理的基本要求。 相似文献
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麦胚多层多室流化床在线稳定化试验 总被引:2,自引:0,他引:2
针对小麦胚芽快速酸败变质的特性,采用多层多室流化床装备对麦胚进行在线稳定化处理.根据麦胚的性质和实际产量要求,将改良设计的多层多室流化床装备与面粉生产线连接,并选取不同温度、风量等参数进行在线试验,研究流化床对麦胚的稳定化效果.结果表明,出风温度45℃为稳定化处理麦胚的优化条件.处理后的麦胚VE损失6.28%,氮溶解指数下降1.11%,脂肪酸组成和相对含量未产生明显变化.产品经30 d加速贮藏,过氧化值7.2 mmol/kg,酸价18.47 mg/g.试验表明,该技术与装备已达到了麦胚稳定化处理的基本要求. 相似文献
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小麦胚微波稳定化工艺参数响应面法优化 总被引:3,自引:1,他引:2
在对微波稳定各因素分析的基础上,选取影响小麦胚脂肪酶(E.C.3.1.1.3)相对酶活力的因素作响应面分析,利用Design-Expert软件建立数学模型,并对各因素及其相互之间的交互作用进行了分析.结果表明:投料量与小麦胚初始含水率,投料量与微波功率,小麦胚初始含水率与处理时间,微波功率与处理时间对小麦胚脂肪酶相对酶活力的交互作用显著,在微波功率为675W,初始含水率为15%,投料量为180g,处理时间为3.0min时,灭酶效果最好,脂肪酶相对酶活力为14%. 相似文献
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微波辐射对小麦胚芽糊化特性与微观结构的影响 总被引:2,自引:0,他引:2
为研究微波辐射对小麦胚芽(WG)品质的影响,采用连续式微波装备对WG进行稳定化处理,并用扫描电镜、粘度仪分析了微波辐射对其微观结构、淀粉糊化等特性的影响.结果表明,微波对WG有很好的稳定化效果,在有效钝酶的前提下经微波处理的WG仍可观察到完整的淀粉颗粒,并伴有清晰的轮廓,但随着微波辐射强度的提高,其中油脂、蛋白质及淀粉之间原有的空间结构发生了一定的改变.微波处理后WG的糊化温度由原来的58.5℃升至59.3~ 65.4C,根据初始糊化程度的不同,出现具有一定意义的峰值粘度(349~ 466 BU)和破损值(69 ~87 BU).微波处理后的WG中脂肪酸组成和α-维生素E含量无明显改变.研究表明,微波辐射在有效钝酶的同时,对WG的品质也产生了部分影响.但与传统热处理方法相比,微波辐射对WG品质影响程度较小,微波稳定化具有很好的工业化应用前景. 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