水酶法提取冬瓜籽油工艺优化及体外抗氧化活性研究

以冬瓜籽为原料,采用水酶法提取冬瓜籽油。通过单因素试验设计研究酶的种类、pH、酶解时间、酶解温度、料液比对冬瓜籽油提取率的影响,并利用Box-Behnken试验设计确定冬瓜籽油的最佳提取条件。由响应面分析得出冬瓜籽油的最佳提取条件为:以葡聚糖酶为酶解用酶,料液比1∶6,酶解时间6.1 h,酶添加量3%,酶解温度60℃,pH 4.22。在最佳提取条件下,冬瓜籽油提取率达90.67%。体外抗氧化活性研究表明:冬瓜籽油对DPPH自由基、羟基自由基清除率及铁离子还原能力随其质量浓度增加而增大;对DPPH自由基清除率IC_(50)为10.23 mg/mL,对羟基自由基清除率IC_(50)为0.39 mg/mL,冬瓜籽油质量浓度为1.0 mg/mL时,其对羟基自由基清除率为98.84%,与V_C的清除效果相当。     

超声辅助水酶法提取冬瓜籽油的工艺研究

以冬瓜籽为原料,采用超声辅助水酶法提取冬瓜籽油。在单因素实验的基础上进行正交实验,得出最佳提取工艺条件:颗粒粒度60目,液料比7∶1,酶用量2.0%(以冬瓜籽质量计),pH 8.0,酶解温度55℃,超声时间20 min,超声功率150 W,超声温度50℃。在最佳条件下,冬瓜籽油提取率为82.55%。     

响应面优化水酶法提取奇亚籽油工艺

以奇亚籽为原料,采用水酶法提取奇亚籽油。在单因素实验的基础上,采用响应面法对水酶法提取奇亚籽油的工艺条件进行优化。结果表明,水酶法提取奇亚籽油的最佳工艺条件为:碱性蛋白酶作为酶解用酶,酶解温度45℃,液料比8. 47∶1,pH 10,酶添加量5. 17%,酶解时间2. 16 h。在最佳条件下,奇亚籽油提取率为89. 53%。     

水酶法从巴旦木中提油及水解蛋白研究

采用水酶法从巴旦木中同时提取油与水解蛋白。依次使用复合细胞壁多糖水解酶(纤素酶;果胶酶=1:2)和碱性蛋白酶水解巴旦木浆,并对酶解工艺条件进行优化。通过单因素试验及正交试验,确定水酶法提取巴旦木油的最佳工艺条件为料液比1:5、粒径40目、复合细胞壁多糖水解酶用量3.5%、酶解温度40℃、酶解时间4h、碱提pH9.0、蛋白酶用量1.5%、酶解温度50℃、酶解时间2h;水酶法提取巴旦木水解蛋白的最佳工艺为料液比1:5、粒径30目、细胞多糖水解酶用量3%、提取温度50℃、提取时间3h、碱提pH8.5、蛋白酶用量1.5%、酶解温度50℃、酶解时间2.5h。在此最佳条件下进行实验验证,总的巴旦木游离油和水解蛋白得率分别为68.74%和74.39%。     

超声波辅助酶法制备山核桃油的工艺研究

以临安山核桃仁为原料,结合超声波辅助,研究水酶法提取山核桃油的加工工艺。结果表明,复合酶酶解制取山核桃油的最佳工艺条件：纤维素酶、半纤维素酶、果胶酶、中性蛋白酶4种酶配比为2∶5∶2∶4,料水比1∶5,加酶量1.6%,酶解温度45℃,酶解pH值为7.0,酶反应时间3h。在最佳工艺条件下,山核桃油得率为54.23%。     

超声辅助水酶法提取黄秋葵籽油的研究

为提高黄秋葵籽油的提取率,采用超声波辅助水酶法提取黄秋葵籽油,通过单因素试验和正交试验对超声波预处理条件、酶解条件进行优化。结果表明：超声波预处理条件为料液比1∶7（g/mL）、超声时间35 min、超声功率70%（总功率为500 W）、超声温度45℃,在此条件下黄秋葵籽油提取率为46.46%;最佳酶解条件为加酶量2.0%、酶解时间4 h、酶解pH 7.0,在此条件下黄秋葵籽油提取率为49.98%。     

混料设计优化水酶法提取西瓜籽油的工艺研究

以西瓜籽为原料,研究水酶法提取西瓜籽油的最优工艺并对其脂肪酸组成、理化特性进行分析。在单因素实验基础上,采用混料设计对复合酶不同配比进行优化。得到的最优分步酶解条件为:首先采用复合酶(纤维素酶、果胶酶、半纤维素酶)配比0.68∶0.22∶0.10,复合酶添加量2.0%,在p H 5.0、酶解温度50℃、液料比7∶1条件下酶解2 h;然后加入1.5%的碱性蛋白酶,在p H 7.5、酶解温度55℃条件下继续酶解2 h。在最优分步酶解条件下,西瓜籽油提取率为91.45%。所得西瓜籽油色泽淡黄,澄清透明,富含不饱和脂肪酸,其理化指标符合国家食用油卫生标准。     

水酶法提取胡麻籽油工艺条件的研究

采用水酶法提取胡麻籽油并对其工艺条件进行了详细研究。在单因素实验的基础上,通过正交实验得出了最佳工艺条件,即20 g研碎油料,加酶量为0.10 g,酶解温度50℃,酶解时间1h,最适pH 5.4,料液比1∶10,浸提温度90℃,浸提时间9 h。另外,水酶法提取胡麻籽油的提油率比水浸法提取胡麻籽油的提油率高24.55%。     

水酶法提取茶叶籽油工艺条件研究

采用水酶法提取茶叶籽油,通过单因素实验和正交实验优化提取工艺条件。结果表明,水酶法提取茶叶籽油优化工艺条件为:纤维素酶用量1.1%、果胶酶用量2.0%、蛋白酶用量0.2%,料液比1:6,酶解温度45℃、酶解pH值5.0、酶解时间8h,茶叶籽油得率28.64%。     

水酶法提取胡麻籽油的工艺及性质研究

以内蒙古胡麻籽为原料,采用水酶法提取胡麻籽油。在单因素试验的基础上,采用响应面分析优化工艺条件,并分析了胡麻籽油的品质。试验得到胡麻籽油的最佳提取工艺条件为料液比1∶14.34(g/mL)、pH 4.9、酶解温度48.9℃、酶解时间3 h、加酶量2.16%,在此条件下胡麻籽油的提取率为64.0%。经测定,水酶法提取的胡麻籽油气味、滋味纯正,水分及挥发物含量为0.132%,酸价(KOH)为1.21 mg/g。     

Textural Properties of Cold-set Gels Induced from Heat-denatured Whey Protein Isolates

A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.     

Occurrence of bisphenol-F-diglycidyl ether (BFDGE) in fish canned in oil

The levels of bisphenol-F-diglycidyl ether (BFDGE) were quantified as part of a European survey on the migration of residues of epoxy resins into oil from canned fish. The contents of BFDGE in cans, lids and fish collected from all 15 Member States of the European Union and Switzerland were analysed in 382 samples. Cans and lids were separately extracted with acetonitrile. The extraction from fish was carried out with hexane followed by re-extraction with acetonitrile. The analysis was performed by reverse phase HPL C with fluorescence detection. BFDGE could be detected in 12% of the fish, 24% of the cans and 18% of the lids. Only 3% of the fish contained BFDGE in concentrations considerably above 1mg/kg. In addition to the presented data, a comparison was made with the levels of BADGE (bisphenol-A-diglycidyl ether)analysed in the same products in the context of a previous study.     

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.     

Contribution of European research to risk analysis

The European Commission's, Quality of Life Research Programme, Key Action 1—Health, Food & Nutrition is mission-oriented and aims, amongst other things, at providing a healthy, safe and high-quality food supply leading to reinforced consumer confidence in the safety of European food. Its objectives also include the enhancing of the competitiveness of the European food supply. Key Action 1 is currently supporting a number of different types of European collaborative projects in the area of risk analysis. The objectives of these projects range from the development and validation of prevention strategies including the reduction of consumers risks; development and validation of new modelling approaches; harmonization of risk assessment principles, methodologies, and terminology; standardization of methods and systems used for the safety evaluation of transgenic food; providing of tools for the evaluation of human viral contamination of shellfish and quality control; new methodologies for assessing the potential of unintended effects of genetically modified (genetically modified) foods; development of a risk assessment model for Cryptosporidium parvum related to the food and water industries; to the development of a communication platform for genetically modified organism, producers, retailers, regulatory authorities and consumer groups to improve safety assessment procedures, risk management strategies and risk communication; development and validation of new methods for safety testing of transgenic food; evaluation of the safety and efficacy of iron supplementation in pregnant women; evaluation of the potential cancer-preventing activity of pro- and pre-biotic ('synbiotic') combinations in human volunteers. An overview of these projects is presented here.     

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     

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,     

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.