外源酶对糙米中植酸降解的影响

利用外源酶制剂降解糙米中的抗营养因子植酸,以提高糙米营养价值。以植酸降解量为指标,考察pH值、温度、酶作用时间和加酶量对外源植酸酶作用的影响,并考察纤维素酶和果胶酶与植酸酶的协同作用效果。结果显示植酸酶作用的适宜条件为：酶用量0.4U/mL,作用温度50℃,pH5.2,浸泡时间4h;添加纤维素酶和果胶酶能有效促进植酸酶的降解作用,大大提高植酸降解率。外源酶制剂能有效降解糙米中的植酸。     

菜籽粕中抗营养因子植酸酶解条件的研究

在菜籽粕中直接添加外源植酸酶,作用于菜籽粕,使其一种主要的抗营养因子(ANF)--植酸分解,根据影响酶反应的主要因素:温度、pH值、反应时间、酶浓度等进行单因素试验,选择合适的因素水平按L9(34)设计,通过正交试验对酶解条件进行了优化.结果表明:植酸酶酶解的优化条件为温度45℃、pH值4.7、反应时间90 min、酶浓度2.4%(菜籽粕量),植酸酶解率可达60%.     

酶法降解米糠中植酸的工艺研究

通过酶法降解米糠中植酸,植酸酶能将植酸及其二价盐类菲丁水解生成肌醇。以酶用量、酶解时间、p H值、酶解温度为影响因素,以代谢产物肌醇含量为判定依据进行单因素试验及正交试验以得出较优组合。通过试验得出四因素对植酸酶酶解植酸所得的肌醇含量的影响大小顺序为:酶用量p H值反应时间反应温度,植酸最佳酶解条件为酶用量60 U/g,反应时间20 min,p H值4.0,反应温度55℃。验证试验测得肌醇含量为66.21 mg。酶解法反应条件温和、耗能低,为工业化生产提供了一种新的思路。     

酶解法制备香菇酱工艺条件的研究

在酶解法制备香菇酱的工艺中,采用正交试验设计分别对纤维素酶酶解条件和蛋白酶酶解条件进行了选择优化。结果表明,纤维素酶酶解的最佳工艺条件为酶解温度50℃、pH值6.5、酶用量0.3%、酶解时间60 min;蛋白酶酶解的最佳工艺条件为酶解温度50℃、pH值4.5、酶用量1%、酶解时间30 min,在此工艺条件下香菇酱的氨基酸含量为0.92%。     

响应面法优化枇杷核多糖的提取工艺

采用响应面分析法(RSM)优化超声波辅助酶法提取枇杷核多糖工艺条件,在单因素实验基础上,选取纤维素酶用量、酶解pH、酶解温度、酶解时间为影响因子,以枇杷核多糖得率为响应值,应用Box-Behnken中心组合实验设计建立数学模型,进行响应面分析,得出优化后的提取工艺条件为:料液比1:15,超声处理温度60℃,超声处理时间30min,纤维素酶用量1.8％,酶解温度49℃,酶解时间1.8h和酶解pH 4.7.在此优化工艺条件下,干燥处理后枇杷核多糖的得率为9.96％.     

牡丹叶黄酮的酶法提取条件优化及其对亚硝酸盐的清除作用

以牡丹叶为原料,采用酶法提取牡丹叶黄酮,以纤维素酶用量、pH值、酶解温度、酶解时间为单因素,以牡丹叶黄酮提取率为考察指标,通过正交试验确定酶法提取牡丹叶黄酮的最佳工艺参数为：纤维素酶用量12.5 U/mL、pH 4.5、酶解温度45 ℃、酶解时间4 h。在此条件下牡丹叶黄酮提取率为2.43%。提取得到的牡丹叶黄酮浸提液可用于亚硝酸盐清除,通过正交试验优化得到牡丹叶黄酮清除亚硝酸盐的最佳反应条件为：反应温度70 ℃、pH 4.0、牡丹叶黄酮提取液添加量25 mL（10 μg亚硝酸钠）、反应时间20 min。在此条件下牡丹叶黄酮对亚硝酸盐清除率可达62.15%。     

玉米秸秆酶解工艺条件优化

研究了不同的因素对纤维素酶酶解玉米秸秆的影响,包括时间、反应温度、底物浓度、酶用量等.采用5因素和4水平进行玉米秸秆酶解正交试验.结果表明,影响玉米秸秆酶解的因素为反应温度>水解时间>底物浓度>速度>酶用量:得到纤维素酶酶解玉米秸秆的最佳条件为反应时间48h,酶解温度55℃,底物浓度20g/L,速度130r/min,酶用量为200U/g.该研究为玉米秸秆的生物利用提供了理论依据.     

红枣-发芽糙米饮料酶解工艺研究

以红枣和发芽糙米为原料,对酶解条件进行研究,采用高温淀粉酶水解红枣和发芽糙米,经过正交试验,得到优化酶解条件为酶用量15U/g、温度85℃、时间65min和pH6.0。经过优化酶解工艺处理的红枣-发芽糙米饮料组织状态均匀,口感良好,具有红枣的特殊风味。     

酶法降低糙米植酸含量工艺条件的优化

以糙米为研究对象，借助超声波强化传质过程，利用植酸酶降低糙米中植酸的含量，研究液料比、温度、pH值对植酸水解反应的影响，采用中心组合试验方案设计和响应面分析方法对植酸水解的工艺条件进行优化。研究结果表明，植酸水解工艺的优化条件为：pH值6．5，温度为53℃，液料比为10。     

酶对发芽糙米皮层结构影响的研究

糙米经过发芽,激发内源酶使得营养价值得以提升的同时,皮层结构也发生了变化,使口感得以变好,但与白米相比还有一定差距。以实验室生产的发芽糙米为原料,利用木聚糖酶和纤维素酶的共同作用对发芽糙米皮层的纤维结构进行部分降解,以酶解释放出的葡萄糖量为指标进行单因素实验,在保证皮层结构的前提下得出结论:在pH5.0,木聚糖酶和纤维素酶质量分数为0.1%,酶解时间5h,酶解温度45℃的条件下,酶解释放出的葡萄糖的浓度为8.39mg/ml。通过扫描电镜可见,经过酶解的发芽糙米皮层结构明显比原糙米及发芽糙米松散。     

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,