响应面法优化微波膨化紫心甘薯片的工艺

将水分含量为20%的紫心甘薯片微波膨化,可得色泽、口味、膨化酥脆度适中的脆片。在单因素试验基础上,采用Plackett Burman试验,筛选出具有显著性影响因素,通过响应曲面法进一步分析这些因素的交互作用对微波膨化紫心甘薯脆片的影响,得到最佳膨化工艺参数,薯片厚度为1 mm,水分含量20%,均湿时间2 d,微波功率430 W,膨化时间40 s。     

预处理对猕猴桃压差膨化脆片品质的影响

将处理工艺与压差膨化技术相结合,以猕猴桃为原料,探讨了切片厚度、预脱水、冷冻等预处理方式对猕猴桃压差膨化脆片品质的影响。通过试验得出猕猴桃压差膨化最佳预处理条件为:切片厚度约8 mm,预脱水方式选择微波干燥,最佳条件为微波功率60 W处理30 s,于-4℃条件下冷冻16 h,在膨化温度95℃,压力差为0.41 MPa,停滞时间为10 min,抽空温度为70℃,抽空干燥时间为180 min的条件下制备的猕猴桃脆片品质优良,具有良好的酥脆性。     

微波膨化再造型黑洋葱紫山药平菇营养脆片的工艺研究

对再造型黑洋葱紫山药平菇营养脆片进行微波膨化,研究糯米粉添加量、料胚厚度、水分均衡时间、微波功率和微波时间对微波膨化效果的影响。得出再造型脆片制作的最佳工艺参数:糯米粉添加量9%、料胚厚度0.6mm、水分均衡60 min、中高档(640 W)微波膨化120 s,在此条件下生产的食用菌脆片休闲食品具有良好营养价值和保健功效,酥脆度、色泽和外型均较好。     

微波膨化荸荠脆片加工工艺的研究

对微波膨化荸荠脆片的加工工艺进行了研究.结果表明,鲜荸荠片先预干燥,再微波膨化,最后二次干燥可获得品质优良的膨化荸荠脆片;最佳微波工艺参数为:微波功率475W,膨化时间14s,预干含水量35%.     

微波膨化猕猴桃脆片工艺的优化

以猕猴桃为原料,研究了微波膨化猕猴桃脆片的最佳工艺。通过单因素实验分别考察了水分含量、切片厚度以及微波时间等因素对膨化率的影响。在此基础上,以膨化率为指标,设计了响应面分析方案,通过数学推导及实验分析,得出微波膨化猕猴桃脆片的数学模型及相关参数。结果表明,微波膨化猕猴桃脆片的最佳工艺参数为:猕猴桃片的水分含量为20%、切片厚度4mm、微波时间62s,在此优化条件下得到的猕猴桃脆片膨化率为73.8%,与回归方程的预测值(73.1%)基本一致。膨化后猕猴桃脆片的水分含量为5.4%,因此会有较酥脆的口感和贮藏稳定性。VC含量在猕猴桃片干燥的过程中和膨化后都显著的减少了。     

甘薯片真空微波干燥工艺的优化

为了获得高品质的膨化甘薯脆片,对真空微波干燥甘薯片工艺进行优化研究.在预干燥甘薯片水分含量、真空度、微波功率和加热时间对真空微波干燥甘薯片品质影响的单因素试验基础上,采用二次回归正交旋转组合设计优化真空微波干燥甘薯片的工艺条件.研究结果表明,适宜的水分含量、微波功率和加热时间可以提高甘薯片的膨化率和脆度,高真空度较利于甘薯片膨化;最佳真空微波干燥甘薯片的工艺参数组合为:预干燥甘薯片水分含量31.23％,微波功率771.38 W,微波加热时间39 s,真空度0.085 MPa.     

冻干胡萝卜片护色工艺的优化

为解决现有技术造成的胡萝卜片色泽差的质量问题,保证产品的天然性,试验在不添加任何添加剂的条件下,经过切片厚度、预干燥方式、含水率、预冻时间和堆叠高度等与胡萝卜片护色效果相关的单因素试验,再经正交试验优化得胡萝卜片护色最佳工艺条件。试验结果表明:胡萝卜片在沸水中预漂烫3 min,POD完全失活;随着切片厚度的增加,脆片的色差降低,7 mm厚度的胡萝卜片在真空冻干之后色差最小;预干燥方法为微波干燥时,对胡萝卜片的色差及外观影响较小;预冻时间和堆叠片数对胡萝卜片色差无显著影响。正交试验表明6 mm切片厚度在240W微波功率下干燥至含水率60%,冻干后的胡萝卜片与新鲜胡萝卜片颜色差异最小。     

响应面法优化甘薯脆片干燥工艺

为探究甘薯脆片热泵干燥最佳工艺,在单因素试验基础上,以烘干温度、烘干时间、切片厚度、汽漂时间为影响因素,以含油率及感官评分为响应值,用Box-Behnken试验设计建立响应面分析模型。结果表明,甘薯脆片烘干最佳工艺为:烘干温度74℃、切片厚度2.7 mm、汽漂时间3 min,烘干时间为3.5 h,在此优化条件下,甘薯脆片油炸后感官评分为88.75分,含油率为7.84%,在此条件下得到的产品色香味俱全。     

微波膨化菊芋脆片的研制

对不同预处理的菊芋片进行微波膨化,研究菊芋片厚度、预处理方式、水分含量、水分均衡时间、微波功率和时间、固化处理方式对微波膨化效果的影响。得出最佳工艺参数：菊芋片厚度6mm,90℃热风干燥3.5h,预处理后菊芋片初始水分含量降至20%,水分均衡4h,用低档(额定功率800W)进行微波膨化150s,在此条件下,产品的酥脆度、色泽和外型均良好,最大膨化率达到2.18。以不同质量浓度糊精、NaCl 或CaCl2 处理新鲜菊芋片。结果表明：NaCl 是影响膨化的最重要因素,其次是糊精和CaCl2,实验的最优组合为NaCl 1.5g/mL、糊精1g/mL、CaCl2 0.4g/mL,此条件处理后的菊芋脆片的酥脆性、膨胀率和色泽均得到了改善。     

微波膨化甘薯鱼糜脆片的加工工艺优化

以甘薯泥和三文鱼加工副产物制作而成的鱼糜为主要加工原料,采用微波膨化技术制作甘薯鱼糜脆片,以产品的感官品质和质构特性为评价指标,通过单因素实验,研究微波膨化条件、植物油添加量、糯米粉添加量、小苏打与碳酸氢铵添加量及其添加比例对甘薯鱼糜脆片的品质影响,并通过正交试验确定最佳工艺。结果表明:以鱼糜与甘薯泥总质量为基准,添加植物油4%,糯米粉30%,小苏打和碳酸氢铵以2:1比例添加1.0%,在500 W功率下微波膨化120 s,制得的甘薯鱼糜脆片感官得分为(86.5±1.01)分,硬度值与脆度值分别为(7654.125±123.521) g、(8165.365±105.347) g,外观完整,色泽均匀,口感酥脆。     

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.