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通过层次分析模型的方法,建立了评价冻干后品质的综合评判体系,用以甄选冻干的最佳工艺条件.并以冻干鱼香肉丝为例,证明此种方法能有效地兼顾各指标值间的优先度,很大程度上克服了常规普遍存在的主观性、盲目性和模糊性,是解决真空冻干燥品质综合评价问题行之有效的方法. 相似文献
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为探究不同酵母抽提物在预制鱼香肉丝菜品中应用效果,通过单因素实验和正交实验优化酵母抽提物、食盐和味精添加量对预制鱼香肉丝感官特性的影响,确定最佳制备工艺参数。工艺优化结果表明:酵母抽提物YE-1、食盐和味精添加质量比均为0.5%时预制鱼香肉丝菜品感官评分最高。基于此工艺配方,采用GC-MS(气相色谱-质谱联用)技术测定鱼香肉丝菜品和调味料包挥发性风味物质成分,菜品中检测出65种挥发性风味成分,调味料包检测出39种。醛类、醇类为菜品主要风味物质,菜品和调味料包在酯类及烯烃类物质上存在较大差异。研究结果可为酵母抽提物在预制菜品中应用提供理论支持和参考。 相似文献
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目的 采用数值模拟方法预测和优化冻干速溶绿茶粉的中试试验生产工艺。方法 通过有限元法建立二维传热传质相变模型, 模型模拟茶粉冻干过程中温度场、压力场、水分迁移的变化过程。结果 利用模型优化的生产工艺为: 物料铺盘厚度调整为15 mm, 采用阶段升温方法, 在升华干燥0~2 h、2~4 h、4~6 h、6~8 h及8~26.5 h五个时间段中, 调整环境辐射温度为0、10、30、50、60℃。按上述工艺生产所得的速溶绿茶粉的水分含量(质量分数)是(3.9±0.19)%, 各项理化指标符合国家产品标准要求。结论 该模型的预测结果与试验结果相吻合, 采用数值模拟方法可以用于预测和优化冻干速溶茶粉的中试试验生产工艺, 为今后进一步的产业化生产提供参考与借鉴。 相似文献
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《中国调味品》2019,(6)
为获取高品质的香荚兰全粉,采用真空冷冻干燥技术对香荚兰进行干燥处理,以物料形态、冻干时间、冻干温度为试验因素,以感官评价、香草醛含量、水分含量为指标,考察干燥条件对香荚兰全粉质量的影响,采用正交试验法优化,确定真空冷冻干燥的最佳工艺参数;将真空冷冻干燥、风干、微波干燥3种不同方式制得香荚兰全粉的感官品质及风味物质进行比较。结果表明:冻干时间8 h、冻干温度65℃、物料形态为切段冻干时,得到的全粉风味较好、品质较佳,直观分析法水分含量、香草醛含量、感官得分分别为5.99%、2.13 g/100 g、76.89,综合评分法得分为2.459。真空冷冻干燥、风干、微波干燥3种工艺制备的香荚兰全粉感官得分分别为75.60,62.40,62.40;香草醛含量最高的为真空冷冻干燥工艺,检出具有呈香作用的挥发性成分主要以芳香族、醛类及酯类为主,其中真空冷冻干燥和风干对挥发性成分种类和组分的保留效果较佳,与原豆荚共有成分高达31种,微波干燥最少,损失最多,仅剩12种。综合考虑,采用真空冷冻干燥工艺制备香荚兰全粉最为适合。 相似文献
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为支撑卷烟行业特色加工工艺及装备研究、解决传统静态真空回潮方式存在的松散效果不理想、回透率低的问题,设计并制作了用于试验室小试验线的正圆柱筒体真空回潮设备,主要包括真空罐体、真空机组、热水器机组、管道系统以及电控系统等部分,设备在具备真空回潮功能的同时,还具备加料的能力。通过开展工艺参数对产品质量影响规律研究、小试验线与大生产线感官质量符合性研究,明确以下几点:①根据工艺参数调整,试验室用真空回潮设备对产品感官质量的影响规律与大生产线设备相同,通过参数优化可实现与大生产线产品感官质量的高度一致;②蒸汽施加时间与物料出口水分呈正相关关系;③动态真空回潮条件下,能有效提升松散效果以及回透率,并保持叶片结构与大生产线产品持平。 相似文献
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为研究燕麦β-葡聚糖-表没食子儿茶素没食子酸酯复合物在模拟胃肠液中的稳定性,采用真空冷冻干燥法制备燕麦β-葡聚糖-表没食子儿茶素没食子酸酯复合物。在模拟胃肠液中通过不同pH值和复合物质量浓度,探讨在胃肠液中pH值和复合物质量浓度对于复合物稳定性的影响。结果表明:在胃液和肠液中,pH值越低,复合物越稳定。由于进食会使得胃肠液的pH值增大,表明在禁食状态下复合物状态更稳定。复合物质量浓度越大,其在胃肠液中的稳定性越高,且达到在0.8 mg/L时,180 min孵育后复合物稳定性均达到80%以上。由此表明可以通过适当增大复合物的质量浓度来提高胃肠液的稳定性。 相似文献
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本文以草鱼片为试材,研究了不同真空压力(600~700、1100~1200、1600~1700 Pa)、不同物料厚度(3、5、7 mm)条件下草鱼片冰温干燥特性,通过水分比的变化拟合草鱼片冰温干燥数学模型。实验结果表明:真空压力和物料厚度均对草鱼片冰温干燥的速率有较大影响,真空压力越低、草鱼片厚度越薄,干燥用时越短。Midilli模型能较好的模拟草鱼片冰温真空干燥过程,Midilli模型的R2>0.997,χ2<0.08‰,RMSE<0.85%,模型预测值与实验值很好吻合,可以用来描述草鱼片冰温干燥进程。 相似文献
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E. Huber 《International Journal of Food Properties》2013,16(2):287-298
The influence of meat sample dimensions on the mass transfer coefficient (kS) of precooked cuts of pork, beef, and chicken during vacuum cooling, as well the behavior of this coefficient during the vacuum cooling process, were investigated. It was evidenced that the kS parameter presented statistical correlations with sample volume. The strongest dependence was found for precooked breast chicken, showing that this product can be cooled by vacuum impregnation. Knowledge of this dependence is important in order to evaluate the dimensions and geometric formats of meat cuts to be treated by vacuum cooling. Experiments with cylinders filled with moist sand showed that for porous materials kS can be considered proportional to the sample volume, and that the initial moisture content influences the internal temperatures during the cooling process. Knowledge of the kS behavior, with respect to sample volume, aids an understanding of the water evaporation and temperature decrease during the vacuum cooling of porous foods. 相似文献
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The use of the simultaneous brine thawing/salting on frozen raw material was compared in a previous work with the traditional pile salting method. The aim of this study was to characterise and compare the post-salting stage in Spanish cured ham production by processing fresh and thawed raw material with the traditional pile salting method (which can be considered as the reference method), with the results obtained using the brine thawing/salting method, with and without applying vacuum impregnation. The obtained results show that the thawed salted hams exhibited a higher NaCl diffusion than the fresh ones, implying a shorter post-salting period. Post-salting stage could be reduced from the 50 days employed in the traditional fresh raw material salting, to 25 days when using frozen hams brine thawed/salted. No influence of the use of vacuum impregnation during the salting stage was observed on the post-salting period. 相似文献
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The colour fading of sliced ham displayed in chill cabinets has been found to be caused by the combined action of light and oxygen, and can be prevented by a combination of packaging in a plastic material with low oxygen transmission rate (OTR<4 cm3/m2/24h/atm), a high initial vacuum level (>99%), and cold storage in the dark until residual oxygen in the packaging has been consumed (4 days for>99% initial vacuum). UV-light permeability of the packaging material had no effect on colour stability. The colour was measured by tristimulus colorimetric measurements on the surface of ham packaged in packaging material with different OTR (60 and <4 cm3/m2/24h/atm) and UV-light permeability (transparent above 360 and above 250 nm), and the change in colour was monitored by the Hunter a value, the tristimulus colorimetry parameter found (by analysis of variance) to give the best correlation with the subjectively evaluated ham colour. For each of the four types of packaging material, three different initial vacuum levels (85, 95 and>99%) were used. 相似文献
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微波辅助法萃取当归多糖的条件优化 总被引:22,自引:0,他引:22
采用单因素试验和正交试验 ,进行了微波辅助萃取当归多糖的研究 ,得到了微波辅助萃取当归多糖的最佳工艺条件 :m(水 ) /m(当归粉 ) =9,微波功率 45 0W ,萃取 2次 ,每次萃取 4min。萃取液经真空浓缩 ,用活性炭脱色后 ,加入乙醇使多糖沉淀 ,过滤 ,沉淀用乙醇洗涤多次 ,真空干燥后即为当归多糖 ,产率 1 5 2 %,多糖质量分数 91 6%。与直接加热萃取法进行比较 ,结果表明 ,微波辅助萃取能大大缩短萃取时间 ,降低萃取剂用量 ,并能提高当归多糖产率。 相似文献