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米糠油脱臭馏出物中生物活性成分的研究
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摘要
本文以米糠油脱臭馏出物为研究对象,研究了精炼工艺对脱臭馏出物中生物活性成分的影响,分析了脱臭馏出物的性质,为其进一步开发利用奠定了科学基础;建立了脱臭馏出物中甾醇测定的方法;研究了物理脱酸与酶法酯化为基础的甾醇和生育酚分离提取技术;建立了甾醇精制工艺,评价了米糠甾醇调节血脂的作用。
     研究了米糠油精炼过程中,脱胶、脱酸、脱色、脱蜡、脱臭等工艺对米糠油脱臭馏出物的影响,发现米糠油精炼过程中,毛油的水分、酸度和过氧化值有较大幅度地下降,经过精炼工艺水分从1.12%下降到了0.05%,酸度从8.25%下降到了0.09%,过氧化值从8.54meq/kg下降到了0.26meq/kg,不皂化物的含量没有明显改变,大量浓缩到脱臭馏出物中,脂肪酸的绝对含量及相对含量、生育酚的含量也没有明显降低。
     分析了脱臭馏出物的主要组成成分及其理化性质,其水分含量达到了0.8%,酸度高达49.35%,如果提取其中的生物活性成分,必须除去其中的脂肪酸成分,并在预处理工序中要将水分降低到合理的水平,发现脱臭馏出物的脂肪酸组成与米糠油基本一致,在脂肪酸中棕榈酸、油酸和亚油酸的比例为20.32%,41.29%,和31.78%,其中不饱和脂肪酸达到了75.26%,容易引发氧化反应,宜采用充惰性气体保存,证实脱臭馏出物的不皂化物含量23.03%,甾醇含量14.82%,生育酚含量1.42%,具有分离提取甾醇和生育酚的价值。
     研究了比色法测定脱臭馏出物的甾醇含量,确定了显色反应时间15分钟和测定波长630nm,建立了一种简便、快捷的甾醇测定方法,样品回收率91-103%,相对标准偏差小于5%,采用该方法测定了米糠油、菜籽油、大豆油和玉米油四种脱臭馏出物的甾醇含量。建立了一种植物甾醇的气相色谱检测方法,先以石油醚为溶剂,将样品溶解,再使其硅烷化,最后用气相色谱火焰离子检测器分析,色谱条件:氦载气流速0.5ml/min,检测器温度:320℃,FID空气流速280ml/min,FID氢气流速30ml/min,FID补充氮气流速-20ml/min。
     建立了脱臭馏出物物理脱酸、酶催化酯化、甘油酯转酯化、冷却结晶、分子蒸馏的甾醇和生育酚分离提取工艺,研究了脱臭馏出物的预处理技术,在105℃温度和100Pa真空度下,经过薄膜蒸发,米糠油脱臭馏出物水分含量从0.8%降到了0.05%,对影响脱臭馏出物分子蒸馏后酸值和生育酚回收率的四个因素进料速度、蒸馏温度、蒸馏压力和刮膜转速进行了单因素实验,进一步通过正交实验,确定了影响酸值的顺序是:压力、温度、转速和进料速度。通过极差分析获得了四个因素的最佳组合条件,在进料速度11ml/min,蒸馏温度145℃,蒸馏压力13Pa,刮膜转速300转/分时,生育酚回收率达到了82.52%,游离脂肪酸降低了76.01%。
     研究了脱臭馏出物的酶催化酯化工艺,经过单因素实验,确定的反应条件为酶剂量0.0010g/g,反应温度60℃,反应时间4h,酯化率95%左右。研究了脱臭馏出物甘油酯的转酯化反应,在料液比10g/ml,转酯化温度70℃,酯化时间2h的条件下,甘油酯含量从18.65%下降到了0.58%。研究了脱臭馏出物酯化产物的冷却结晶工艺,比较了自然降温和冰箱降温方式及养晶温度对甾醇纯度和回收率的影响,得到了纯度为50%左右的甾醇样品。
     建立了脱臭馏出物的四次分子蒸馏工艺,第一、二次分子蒸馏条件为进料速度11ml/min,蒸馏温度105℃,蒸馏压力13Pa,刮膜转速300转/分;第三次分子蒸馏条件为进料速度11ml/min,蒸馏温度195℃,蒸馏压力13Pa,刮膜转速300转/分;第四次分子蒸馏条件为进料速度11ml/min,蒸馏温度135℃,蒸馏压力13Pa,刮膜转速300转/分。经过四次分子蒸馏,生育酚纯度52.35%,回收率78.45%。
     分析了甾醇精制过程中降温速度、液料比和养晶时间对纯度和回收率的影响,通过响应面优化实验,甾醇纯度和回收率分别达到了92.25%和86.68%,最佳精制条件为降温速度1.54℃/min,液料比10(ml/g),养晶时间9.40h。对比了自制甾醇和商品甾醇的外观、纯度、熔点和旋光度等物理指标,二者差异不大。
     研究了三种剂量米糠甾醇对大鼠高血脂症的预防和治疗作用,米糠甾醇能显著降低高血脂症大鼠的血清总胆固醇、低密度脂蛋白、甘油三酯和动脉硬化指数,对高密度脂蛋白无显著影响。建立了高血脂症大鼠的建模方法,研究了米糠甾醇对高血脂症大鼠肝脏的影响,实验表明米糠甾醇能够显著降低大鼠的肝重和肝系数。RBS55低剂量组、RBS55高剂量组和RBS90组的实验结果对比表明,纯度为90%的米糠甾醇调节血脂效果优于纯度为55%的低剂量组和高剂量组甾醇。
The object of this study is rice bran oil deodorizer distillate. We investigated the relationship between refining process and bioactive components in deodorizer distillate, explored the characteristics of deodorizer distillate, and provide the foundation of the science of further utilization. The simultaneously analytical method of crude sterol and phytosterol was developed in our study. We also founded the techniques about extraction and isolation of sterol and tocopherol, which were based on the physical deacidification and enzymatic esterification. Furthermore, we established the refining process of sterol, and evaluated function of rice bran sterol regulating the blood fat in rats.
     In the study of refining process, we discussed the characteristics of rice bran oil deodorizer distillate effected by degumming, deacidification, bleach, dewaxing, and deodorization technology. Our results proved that the water content, acidity and peroxide value decreased from1.12%,8.25%and8.54meq/kg to0.05%,0.09%and0.26meq/kg in refining process, respectively. At the same time, the contents of unsaponifiable matter, fatty acid and tocopherol were rarely changed in the refining process.
     We analyzed the components and physicochemical characteristics of deodorizer distillate. The water content and acidity were0.8%,49.35%respectively. Moreover, the content of unsaponifiables, crude sterol, tocopherol was23.03%,14.82%and1.42%respectively, which proved that the rice bran oil deodorizer distillate was important source for isolation of sterol and tocopherol. It is necessary to remove fatty acid, and control the water content in pretreatment process when we extracted the bioactive components in deodorizer distillate. Our data proved that the fatty acids were similar with them in rice bran oil. The ratio of palmitic acid, oleic acid and linoleic acid in deodorizer distillate was20.32%,41.29%, and31.78%respectively. In the storage of rice bran oil deodorizer distillate, the package should be filled with inert gas, because that the content of unsaturated fatty acid was75.26%easily initiating oxidation reaction.
     We established the colorimetric analytical method detecting sterol in the deodorizer distillate, which was a rapid and convenient determination with recovery rate as91-103%, and relative standard deviation less as5%. The color reaction was15minutes, and determinated wavelength was630nm. With above analytical methods, we detected the content of crude sterol in the deodorizer distillate of rice bran oil, rapeseed oil, soybean oil and corn oil. Moreover, we also found the analytical method based on gas chromatography for plant sterol. The sample was firstly dissolved with petroleum ether, then made it for silanization, finally analyzed with flame ionization detector. The detailed chromatography parameters were helium carrier gas flow rate as0.5ml/min, detector temperature as320℃, FID air flow rate as280ml/min, FID hydrogen flow rate as30ml/min, and FID supplemental nitrogen flow rate as-20ml/min.
     We established the extraction and isolation technology of sterol and tocopherol, which were based on the physical deacidification, enzyme catalyzed esterification, tryglyceride ester transesterification, cooling crystallization, molecular distillation. The pretreatment technology was temperature as105℃, vacuum degree as100Pa. The water content decreased from0.8%to0.05%after thin-film evaporation. Meanwhile, we analyzed the recovery rate of tocopherol and acid value of molecular distillation by single factor and orthogonal experiments. The important index decided the efficiency of molecular distillation was in proper sequence as distillation pressure, vapourizing temperature, scraped film speed and feed rate. The optimum technological conditions determined by extreme difference analysis were feed rate as11ml/min, vapourizing temperature as145℃, distillation pressure as13Pa, and scraped film speed as300rpm/min, recovery rate of tocopherol as82.52%, free fatty acid as76.01%. Moreover, we founded the technological process of enzyme catalyzed esterification by single factor experiment, which include enzyme dose as0.0010g/g, temperature as60℃, reaction time as4h, and recovery rate as95%. Furthermore, we studied the conditions of glyceride transesterification, such as solvent ratio as lOg/min, temperature as70℃, transesterification time as2h. The content of glyceride decreased from18.65to0.58%. We also found the conditions of cooling crystallization, comparing with natural cooling process, cooling with refrigerator and cultured crystallization temperature, and obtained the crude sterol with purity as50%.
     We explored the four phase distillation process. The first and second distillation were same as feed rate as11ml/min, vapourizing temperature as105℃, distillation pressure as 13Pa, and scraped film speed as300rpm/min. The third distillation was feed rate as11ml/min, vapourizing temperature as195℃, distillation pressure as13Pa, and scraped film speed as300rpm/min. The fourth distillation was feed rate as11ml/min, vapourizing temperature as135℃, distillation pressure as13Pa, and scraped film speed as300rpm/min. The purity of tocopherol was52.35%, and recovery rate was78.45%after fourth-molecular distillation process. At last, we analyzed purity and recovery rate of sterol effected by the cooling rate, solvent ration and cultured crystallization time. With the response surface optimization experiment, the purity and recovery rate of sterol was92.25%and86.68%, when the optimal conditions were such as cooling rate1.54℃/min, solvent ration10(ml/g) and cultured crystallization time9.40h. Our product was similar with commercial sterol at appearance, purity, melting point, optical rotation and other physical characteristics.
     We explored the important role of rice bran sterol in preventing and curing the hyperlipemia in rats. The total serum cholesterol, low density lipoprotein, triglyceride and atherogenic index except for high density lipoprotein were obviously decreased in rats administered with our rice bran sterol. We also found that the live weight and liver coefficient of rats decreased with hyperlipidemia rat model fed with rice bran sterol. When compared the results of RBS55low dose group, RBS55high dose group and RBS90group, we found the sterol with purity of90%was more efficient in modulating hyperlipemia than the RBS55low dose group and RBS55high dose group.
引文
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