共查询到20条相似文献,搜索用时 93 毫秒
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介绍了抗性麦芽糊精的形成机理、生产工艺和生理功能的最新研究进展,阐述了抗性麦芽糊精主要产品的基本性质及其在食品工业中的应用。 相似文献
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丙酮酸发酵液脱色工艺的研究 总被引:3,自引:0,他引:3
研究了粉末活性炭、K-15颗粒活性炭和732阳离子树脂等三种脱色剂对丙酮酸发酵液的脱色条件、脱色效果及其对丙酮酸的吸附程度。结果表明,732阳离子树脂是理想的脱色剂,具有脱色、沉淀蛋白质和去除钠离子三种功用。确立丙酮酸发酵液的脱色工艺为:离心发酵液→阳离子柱脱色和改性发酵液→后续工序,减少了离交法提取丙酮酸的环节,增加丙酮酸提取的收率。 相似文献
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曲酸在食品、化妆品、医药及化工等行业均有广泛的应用。为提高从发酵液提取曲酸的回收率和产品纯度,对浓缩结晶法提取曲酸的脱色工艺条件进行优化。研究结果表明:强酸性阳离子交换树脂的最佳条件是柱内径30mm和流速5.6mL/min;活性炭脱色的最佳条件是活性炭用量为3.0%、脱色温度65℃、脱色pH3.0和脱色时间30min。用该脱色工艺所提取的曲酸样品的纯度经高效液相色谱法(HPLC)检测为99.72%,曲酸的总脱色率和总回收率分别为98.71%和72.86%;通过扫描电子显微镜观察该曲酸纯品为四棱柱状晶体。 相似文献
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研究了目前饲料生产中常用的磷源,即磷酸氢钙(含磷18%)和磷酸三钙(含磷14.8%),对猪生长性能,血液中钙,磷浓度以及对增重成本的影响。结果表明:以磷酸氢钙为磷源时,猪的日增重及饲料报酬均高于磷权三钙组(P<0.05);采食量差异不显著;磷酸氢钙组每千克增重成本低于磷酸三钙组而具有明显的经济效益,据此得出结论:20-60kg阶段的生长猪可优先选用磷酸氢钙作为日粮中的磷源。 相似文献
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长链脂肪醇磷酸酯合成新方法的研究 总被引:7,自引:0,他引:7
以C12—14混合醇为原料,在n(脂肪醇)∶n(P2O5)∶n(水)=2∶1∶1、反应时间3 h、反应温度75℃的条件下,得到含C12—14混合醇磷酸酯体系并作为预分散介质物,用于后面磷酸化时均匀分散P2O5,再添加脂肪醇进行磷酸酯化反应。通过对比实验发现预分散体系的工艺技术方法可大大减少P2O5在酯化反应中的结块现象,反应平稳缓和,产品颜色浅淡,产物中单酯含量高。在P2O5预分散条件下脂肪醇磷酸酯的制备过程中,先磷酸化再水解的工艺方法要优于先加水再磷酸化的工艺方法,预分散工艺循环2次以后产物基本组成趋于平衡。这是一种脂肪醇磷酸酯合成的新工艺方法,有推广实际应用前景。 相似文献
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麦芽糊精挤压生产的试验研究 总被引:3,自引:0,他引:3
探讨应用双螺杆挤压机挤压生产麦芽糊精的可行性,采用中心组合试验设计和响应面分析,重点研究了机筒温度、物料水分含量和酶浓度3个参数对麦芽糊精DE值的影响。结果表明:机筒温度、物料水分含量和酶浓度3个参数均对DE值有显著影响,DE值随水分含量的增加而增大;随着酶浓度的增加而增加,但是酶浓度达到1.4(mL/kg淀粉)DE值达到最大值;随机筒温度的增加,先增大后减小,在95℃DE值达到最大。并制备了不同DE值的麦芽糊精。 相似文献
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Cheddar cheese was made from milk concentrated by reverse osmosis (RO) to increase the lactose content or from whole milk. Manufacturing parameters (pH at coagulant addition, whey drainage, and milling) were altered to produce cheeses with different total Ca contents and low pH values (i.e., <5.0) during ripening. The concentration of insoluble (INSOL) Ca in cheese was measured by cheese juice method, buffering by acid-base titration, rheological properties by small amplitude oscillatory rheometry, and melting properties by UW-Melt Profiler. The INSOL Ca content as a percentage of total Ca in all cheeses rapidly decreased during the first week of aging but surprisingly did not decrease below approximately 41% even in cheeses with a very low pH (e.g., ∼4.7). Insoluble Ca content in cheese was positively correlated (r = 0.79) with cheese pH in both RO and nonRO treatments, reflecting the key role of pH and acid development in altering the extent of solubilization of INSOL Ca. The INSOL Ca content in cheese was positively correlated with the maximum loss tangent value from the rheology test and the degree of flow from the UW-Melt Profiler. When cheeses with pH <5.0 where heated in the rheometer the loss tangent values remained low (<0.5), which coincided with limited meltability of Cheddar cheeses. We believe that this lack of meltability was due to the dominant effects of reduced electrostatic repulsion between casein particles at low pH values (<5.0). 相似文献
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探讨了磷酸三丁酯对壬烷基酚聚氧乙烯酸的润湿增效作用。通过表面张力、接触角、润湿时间等物理量的测定,讨论了磷酸三丁酯增效作用的机理;同时还讨论了活性剂浓度、温度、介质酸碱性等因素对该润湿效果的影响。 相似文献
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Polyphenol oxidase (PPO) was selectively extracted from reconstituted freeze-dried apple skin using reverse micelles formed by a cationic surfactant, dodecyl trimethyl ammonium bromide (DTAB). An optimum forward extraction was achieved with sodium phosphate buffer (pH 6, 100 mM, no added KCl) and an organic phase (isooctane:hexanol at a ratio of 5:1) containing 100 mM DTAB. The solubilised PPO was efficiently recovered by a stripping solution (pH 6, 1 M KCl) containing 10% ethanol. Under the optimised conditions, the purification fold and recovered activity of PPO were 12.6% and 71%, respectively. This purification fold and recovery were maintained when the extraction volume increased from 10–200 ml. Overall, reversed micellar extraction can be used as an efficient first step for the purification of PPO from apple skin. 相似文献