枣渣水不溶性膳食纤维超声脱色工艺研究

红枣渣含有丰富的水不溶性膳食纤维,但直接从红枣渣制备的水不溶性膳食纤维色泽较深,影响其产品质量,因此,脱除枣渣水不溶性膳食的色泽对开发利用枣渣具有重要意义。为脱除枣渣水不溶性膳食纤维的色泽。本文采用超声辅助H2O2技术对枣渣水不溶性膳食纤维进行脱色,研究H2O2脱色浓度、脱色时间、脱色温度和超声功率对枣渣白度的影响,在单因素实验的基础上,采用正交实验对脱色工艺条件进行优化。结果表明:其最佳工艺条件为:脱色浓度7%,脱色时间20min,脱色温度47℃,超声功率160W,该条件下枣渣不溶性膳食纤维的白度达到62.3。表明超声辅助脱色技术是一种适宜的枣渣水不溶性膳食纤维脱色方法,为提高枣渣水不溶性膳食纤维产品的质量提供了参考依据。     

响应面法优化竹笋中不溶性膳食纤维的超声辅助提取工艺

以竹笋为原料,采用超声波处理法辅助提取竹笋中不溶性膳食纤维,以不溶性膳食纤维提取率作为考察指标。在颗粒粒径、液料比、超声功率、超声时间及超声温度五个单因素影响竹笋不溶性膳食纤维提取率的基础上,通过响应面分析法优化超声辅助提取竹笋不溶性膳食纤维的工艺。结果表明:在颗粒粒径60目、液料比43∶1 mL/g、超声功率454 W、超声时间25 min、超声温度72℃,在此条件下竹笋不溶性膳食纤维提取率为47.23%。     

响应面优化绿豆皮不溶性膳食纤维超声辅助提取工艺

以绿豆皮为原料,采用超声波辅助碱法提取绿豆皮不溶性膳食纤维,通过单因素实验来探讨提取时间、提取温度、超声功率、碱液浓度、液料比五个因素对不溶性膳食纤维提取率的影响,并通过响应面分析来优化工艺条件。结果表明:采用碱液浓度3.0 mol/L,液料比15:1 mL/g,温度52 ℃,在350 W超声波作用下提取148 min,不溶性膳食纤维提取率最大为66.28%±0.052%,此工艺可以有效地从绿豆皮中提取不溶性膳食纤维。     

苦杏仁皮水不溶性膳食纤维提取工艺优化及其特性分析

以苦杏仁皮为原料,选取NaOH溶液浓度、超声时间和超声温度为试验因素,采用响应面法优化苦杏仁皮中水不溶性膳食纤维的提取工艺,并对影响其持水性和溶胀性的因素进行研究。结果表明,苦杏仁皮中水不溶性膳食纤维提取的最佳工艺条件为NaOH溶液浓度0.70 mol/L、超声时间51 min、超声温度86 ℃,此时水不溶性膳食纤维提取率为49.73%。在研究范围内,其持水性和溶胀性受葡萄糖质量分数的影响较小,受酸碱度和超声温度的影响较为显著。     

新疆紫花苜蓿水不溶性膳食纤维的制备及脱色研究

以提取苜蓿蛋白后的新疆紫花苜蓿渣为原料,提取水不溶性膳食纤维的实验研究,研究的关键在于对膳食纤维进行脱色与去除草腥味.由正交实验结果表明:提取水不溶性膳食纤维的最优提取条件为:碱浸温度为30℃,碱浸时间40 min,酸浸温度为90℃,酸浸时间为3 h,得率为73.91%.采用混合溶剂处理使水不溶性膳食纤维呈白色且无草腥味,其膨胀力高达8.15 mL/g,持水力为830%.     

超声波酶法提取茭白不溶性膳食纤维的工艺研究

为了提高茭白的资源利用率和经济附加值,采用超声波酶法提取茭白不溶性膳食纤维。对料液比、水解时间、超声波功率、水解温度、加酶量进行单因素实验及正交试验分析。结果表明,超声波酶法提取茭白不溶性膳食纤维的最佳工艺为:超声波功率500Kw,水解时间15min,料液比1∶35,加酶量0.100g,水解温度60℃。经验证试验,得到茭白不溶性膳食纤维的提取率为45.321%。     

超声波处理对水不溶性膳食纤维膨胀力及持水力的影响

采用超声波法对马铃薯渣中的水不溶性膳食纤维(PIDF)进行处理,研究超声功率、超声时间、超声温度及料液比对水不溶性膳食纤维基本性质的影响。通过单因素和正交实验,确定最佳处理条件:膨胀力的最佳工艺条件为料液比1∶10,超声时间50min,超声温度70℃,超声功率70W,膨胀力为20.50mL/g;持水力的最佳工艺条件为料液比1∶15,超声时间40min,超声温度80℃,超声功率70W,持水力为14.81g/g。     

金盏花渣不溶性膳食纤维的提取

以富舍不溶性膳食纤维的金盏花渣为原料,通过单因素实验和正交实验研究了化学法从金盏花渣中提取不溶性膳食纤维的工艺条件,测定了不溶性膳食纤维的性能.实验结果表明,提取金盏花渣不溶性膳食纤维的最佳工艺条件为碱液浓度1.3mol·L-1,料液比1:13(g/mL),提取时间110min,提取温度40℃.在此条件下不溶性膳食纤维的提取率为60.75%,颜色为近白色,纯度为40.59%,持水力为10.8g/g,溶胀性为12.68mL/g.     

响应面法优化茶渣水不溶性膳食纤维的提取及性能研究

以石阡苔茶茶渣作为实验材料,碱提法对水不溶性膳食纤维进行提取。采用Design-Expert V8.0软件中的Box-Behnken(BBD)中心组合原理设计响应面实验,考察浸提温度、料液比、碱浓度、浸提时间对水不溶性膳食纤维提取率的影响,优化提取工艺,结果表明:优化的最佳提取工艺条件为:浸提温度32.6℃、碱浓度0.2mol/L、浸提时间50min、料液比1∶13.5(g/m L),茶渣中水不溶性膳食纤维的提取率为78.66%;性质研究的结果表明:提取得到水不溶性膳食纤维的持水力为183.92%,溶胀度为2.83m L/g。由此可知,响应面法优化提取水不溶性膳食纤维具有时间短、能耗低、提取率高等特点。     

碱法提取生姜中不溶性膳食纤维的工艺研究

以生姜为原料,对碱法提取其中不溶性膳食纤维的工艺进行了实验研究。考察了料液比、碱液浓度、浸提温度、提取时间对水不溶性膳食纤维得率的影响,通过正交实验优化出提取的最优工艺条件为:碱液浓度0.2%,提取时间90 min,提取温度60℃,料液比1:35(g/m L)。在此条件下,生姜不溶性膳食纤维得率达到64.1%,生姜不溶性膳食纤维的持水力为9.68 g/g,膨胀力为6.69 m L/g,高于标准麸皮纤维的相关功能性指标,显示生姜的水不溶性纤维有较高的利用价值。     

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.     

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.     

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.     

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.