酯化条件对脱臭馏出物中维生素E含量的影响

以油脂脱臭馏出物为原料,采用酸碱酯化工艺提取其中的维生素E,探讨了不同酯化条件下产物中维生素E含量及酸值的变化情况。通过单因素实验和正交实验确定最佳酯化工艺条件为:硫酸溶液质量浓度0.025 g/mL,碱液质量浓度0.008 g/mL,碱酯化前物料水分含量0.6%,碱酯化时间3 h。在此条件下,产物中维生素E含量为6.26%,酸值(KOH)由96.42 mg/g降至3 mg/g。     

棕榈油脱臭馏出物中生育酚及生育三烯酚的富集

采用工业化从大豆油脱馏出物中富集维生素E的工艺,对棕榈油脱臭馏出物中生育酚及生育三烯酚进行了富集。结果表明,采用酯化、酯交换、一次分子蒸馏、冷析、树脂吸附分离、二次分子蒸馏的工艺,可将棕榈油脱臭馏出物中生育酚及生育三烯酚含量从1. 29%浓缩到95%以上,收率可达70%以上。     

离子交换法提纯天然维生素E的工艺研究

天然维生素E是一种具有良好生理功能和药理价值的抗氧化剂,具有广阔的开发前景和市场需求.论述了油脂脱臭馏出物中天然维生素E的特性,对从大豆脱臭馏出物中提取天然维生素E的工艺进行了研究,提出了适合于工厂进行提取天然维生素E的工艺及工艺条件.采用以弱碱阴离子交换树脂对天然维生素E浓缩液进行纯化的工艺条件.考察了上样量、洗脱速度与洗脱剂对分离的影响,以天然维生素E的含量和回收率为评价指标.实验结果表明,弱碱阴离子交换树脂纯化天然维生素E的最佳操作条件为上柱量90mg/mL,洗脱液流速5mL/min,洗脱剂环己烷∶乙醇体积比为75 ∶ 25.天然维生素E含量可由原来的30%提高到90%以上,回收率达到80%以上.今后对天然维生素E的进一步深入研究会取得更好的工艺条件.     

响应面法优化生物酶法催化脱臭馏出物甲酯化

为实现脱臭馏出物绿色、清洁、高效甲酯化,达到环保生产的目的,通过单因素实验和响应面实验对生物酶法催化脱臭馏出物甲酯化反应的工艺条件进行了优化,测定了反应前后维生素E含量的变化,并将新工艺应用于实际生产线。结果表明：生物酶法催化脱臭馏出物甲酯化的最佳反应条件为加水量1%(以脱臭馏出物质量计)、甲醇用量11.5%(以脱臭馏出物质量计)、固定化脂肪酶用量0.3%(以脱臭馏出物质量计)、反应温度35.6℃,在最佳条件下反应8 h脱臭馏出物中游离脂肪酸酯化率达到92.59%,甘油酯酯化率达到94.95%;生物酶法催化脱臭馏出物甲酯化反应过程中维生素E损失少,收率达到93%;与浓硫酸催化甲酯化工艺相比,产品维生素E(50%维生素E)总收率提高了3.47百分点,植物甾醇总收率提高了3.26百分点。综上,生物酶法催化脱臭馏出物甲酯化,可以得到较高的酯化率,提高了产品维生素E和植物甾醇收率。     

响应面法优化维生素E提取工艺

以植物油脱臭馏出物经酯化、冷析、水洗过滤后的酯化液为原料,采用分子蒸馏工艺从酯化液中提取维生素E,通过响应面法分析分子蒸馏过程产生的馏出液中维生素E的含量和回收率,从而优化维生素E提取工艺参数。根据相关研究的经验,进料流量和蒸馏温度是非常重要的工艺参数,进料流量为2～6ml/min,蒸馏温度为90～140℃时,对维生素E提取作用显著。实验结果表明:蒸馏温度110℃,进料流量4.0ml/min,维生素E质量分数达13.32%,回收率达95.12%。在进料流量较低、蒸馏温度较高的条件下,优化分离条件可获得高浓度的维生素E。     

大豆油脱臭馏出物中同时提取角鲨烯、生育酚和植物甾醇的工艺研究

采用酯化—高真空蒸馏工艺路线,从大豆油脱臭馏出物中同时提取角鲨烯、生育酚及植物甾醇。考察酯化条件(甲醇、催化剂浓硫酸用量及反应时间)对酯化率、角鲨烯和生育酚含量的影响。优化得到的最佳工艺为:催化剂浓硫酸添加量0.5%,醇油摩尔比10∶1,反应温度70℃,反应时间120 min,大豆油脱臭馏出物酯化率达到98.2%,生育酚和角鲨烯保留率分别为97.7%和97.5%。酯化后的物料通过冷析结晶,抽滤得到植物甾醇粗品,滤液高真空蒸馏,初步分离得到脂肪酸甲酯、角鲨烯、生育酚等组分。各组分中角鲨烯富集到12.2%,生育酚富集到28.6%,植物甾醇富集到60%左右,初步实现了大豆油脱臭馏出物中角鲨烯、生育酚、植物甾醇的同时提取,为角鲨烯、生育酚及植物甾醇的进一步富集提供了参考依据。     

双低菜籽油脱臭馏出物提取天然VE的酯化工艺研究

探讨了从双低菜籽油脱臭馏出物中提取天然VE的酯化工艺条件,依据正交实验确定了第一次酯化的最佳工艺参数为:馏出物:甲醇(W/V)10:9,酯化温度60℃,酯化时间2 h;第二次酯化的最佳工艺参数为:甘油酯:甲醇(摩尔比)1:6,催化剂用量1.0%,酯化温度45℃,酯化率98.9%.     

脱臭馏出物提取VE的酶预处理

研究了以大豆油脱臭馏出物为原料,采用脂肪酶Novozym435为催化剂,催化脂肪酸与甲醇的酯化反应。反应最佳工艺条件为:反应试剂摩尔比(甲醇∶脱臭馏出物中游离脂肪酸)为2.2∶1,催化剂用量为2.5%,反应温度为35℃,反应时间为10 h。在最佳反应条件下酯化率为95.9%。     

水力空化强化大豆油脱臭馏出物酯化脱酸反应研究

大豆油脱臭馏出物是提取天然维生素E的重要原料。以大豆油脱臭馏出物为原料,在新型水力空化反应器内进行酯化脱酸研究,考察了空化元件入口压力、催化剂(浓硫酸)用量、循环流量和油醇空化体积比对酯化脱酸反应和维生素E收率的影响,并将水力空化混合技术与传统机械搅拌进行了对比。通过实验确定了水力空化反应器内酯化脱酸反应的最适参数:空化元件入口压力0.3 MPa,催化剂用量为油质量的3%,循环流量300 m L/min,油醇空化体积比5∶1;在上述最适参数条件下反应180 min酯化率可达到99%,维生素E的收率为99%。在相同原料配比条件下,与机械搅拌相比,水力空化强化混合条件下酯化率最高提高了12.1%。     

分子蒸馏技术提取茶油脱臭馏出物中维生素E

以茶油脱臭馏出物为原料,采用阳离子交换树脂催化酯化反应,然后将酯化产物进行三次分子蒸馏,逐步脱除脂肪酸和少量的其他杂质。通过正交试验法对分子蒸馏试验条件进行优化。结果表明,当蒸发温度为200℃,进料速率为4 m L/min,刮膜转速为150 r/min时,产物维生素E的纯度达到最高,为0.93%。应用高效液相色谱法对原料成分进行分析,建立了从原料到产品的维生素E含量分析方法,为生产维生素E提供技术参考。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

Review of techniques to manufacture micro-hydrogel particles for the food industry and their applications

Microgels are ‘soft’ microscopic cross-linked polymeric particles that are being increasingly exploited in a variety of industries for rheology control, encapsulation and targeted delivery. They are valued because of the ability to tune their functionality to address specific applications in oil recovery, coatings, drug delivery, cosmetics, personal care and foods. Food microgels are typically biopolymer hydrogels in the form of microspheres, nanospheres (also called nanogels), spheroids and fibres. The utilisation of engineered microgels in foods has so far been limited, despite their great potential to address several needs in the food industry, including: satiety control, encapsulation of phytonutrients and prebiotics, texture control for healthier food formulations (e.g. reduced fat products), and targeting delivery to specific areas in the digestive tract. We review the scientific and patent literature on the utilisation and manufacturing methods for producing microgels with an emphasis on micro-hydrogels for food applications.     

12—A CRITIQUE OF SOME HYPOTHESES RELATING TO THE HETEROGENEITY OF THE HIGH-SULPHUR PROTEINS OF WOOL

Joubert and Burns prepared a large number of fractions from the high-sulphur proteins of wool and estimated their molecular weights and amino-acid compositions. Their data have been re-examined in order to look for statistically significant interrelations between amino acids and between the proportion of various amino acids and molecular weight. Statistical analysis of the data is also used to examine the credibility of some hypotheses concerning the mechanism of keratin biosynthesis and to provide further evidence for the existence of families of proteins within the high-sulphur fractions of wool.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of     

The Latest Data about Development of Chinese Printing Industry in 2013

In the 2014 China（Shanghai）International Printing Week,Director Wang Yanbin released the latest data about development of Chinese printing industry in 2013.According to statistics,in 2013,the total output value of Chinese printing industry exceeded 1trillion Yuan for the first time,reaching 1.03985 trillion Yuan.There were 105,000 printing enterprises in China,employees were 3.415 million.The total asset was 1.06247 trillion Yuan;     

The State Council Issued "Directory of Government Approved Investment Projects(2013 Edition)"

正On December 2nd,2013,the State Council issued the notification of"Directory of Government Approved Investment Projects(2013 Edition)"(hereafter referred to as"notification").It is pointed out in the"notification"that in order to further deepen reforms in investment systems and administrative examination and approval systems,simplify administrative procedures and delegate powers to lower levels,earnestly     

Top Ten News of China's Paper Industry 2013

On December 24th, 2013, the meeting on the selection of top 10 news of China＇s paper industry 2013 sponsored by 〈China Paper Newsletters〉 was held in Beijing. The yearly selection of the top l0 news, which began in 2000, has become a brand activity widely recognized in the industry thanks to the support from the authorities at all levels and public participation.     

National Development and Reform Commission Issued Announcement for Selection of Major Preliminary Research Projects for the "13~(th) Five-Year Plan"

In Apri Commi major p Plan＂ （h 2014, the National Development and Reform ssion issued an announcement for selection of reliminary research projects for the ＂13th Five-Year ereafter referred to as ＂The Announcement＂）     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the latest scientific     

China textile machinery: taking off in progress

正Among the 1600 exhibitors who take apart in the ITMA ASIA+CITME2014 2/3 are Chinese manufactures.If the numerous figures failed to attract your attention,the increase of quality should draw your focus.To adopt the demand of developing textile machine market,domestic textile machinery enterprises now follow the slogan of"technology drives development"to enhance product competitiveness.Our domestic sellers will showcase product ranging from spinning,weaving,dyeing and printing,