脱氢醋酸钠、丙酸钙及其复配在面包中的防腐作用

研究了脱氢醋酸钠、丙酸钙及其复配形式对面包的防腐效果。结果表明 :脱氢醋酸钠和丙酸钙均能有效地延迟面包的霉变时间 ,且随用量的增大 ,效果越好 ;脱氢醋酸纳和丙酸钙复配的最佳比例为 2∶3。     

脱氢醋酸钠、丙酸钙及其复配形式在面包中的防腐作用

研究了脱氢醋酸钠、丙酸钙及其复配形式对面包的防腐效果。结果表明：脱氢醋酸钠和丙酸钙均能有效地延迟面包的霉变时间，且随用量的增大，效果越好；脱氢醋酸纳和丙酸钙的最佳比例为2：3。     

脱氢醋酸钠、丙酸钙及其复配在面包中的防腐作用

研究了脱氢醋酸钠、丙酸钙及其复配形式对面包的防腐效果。结果表明：脱氢醋酸钠和丙酸钙均能有效地延迟面包的霉变时间，且随用量的增大，效果越好；脱氢醋酸纳和丙酸钙复配的最佳比例为2：3。     

食品防腐剂复配形式在面包中的防腐应用研究

GB 2760-2007《食品添加剂使用卫生标准》中规定：面包中允许使用的防腐剂有3种：丙酸盐类、脱氢乙酸及其钠盐、山梨酸及其钾盐。研究了丙酸钙与脱氢醋酸钠两者复配形式、丙酸钙与脱氢醋酸钠和山梨酸钾三者复配形式对面包的防腐效果。结果表明,丙酸钙与脱氢醋酸钠两者复配形式更有利于延长面包保质期,复配的比例6∶4。     

食品防腐剂复配形式在面包中的防腐应用研究

食品防腐剂可防止微生物引起的食品腐败变质,有效延长面包的保质期和销售货架期,而各种防腐剂都有各自的作用范围,两种及以上的防腐剂合理复配使用,往往具有协同作用,比单独使用更为有效。我国《食品添加剂使用卫生标准》GB2760-2007中规定:面包中允许使用的防腐剂有三种:丙酸盐类、脱氢乙酸及其钠盐、山梨酸及其钾盐。本文选用丙酸钙、脱氢醋酸钠和山梨酸钾三种防腐剂,研究了丙酸钙与脱氢醋酸钠两者复配形式、丙酸钙与脱氢醋酸钠和山梨酸钾三者复配形式对面包的防腐效果。防腐剂复配添加量按各自用量占食品添加剂使用卫生标准规定的其最大使用量的比例之和等于1来确定,在面包制作工艺的主面团配料环节加入。结果表明,丙酸钙与脱氢醋酸钠两者复配形式更有利于延长面包保质期,复配的比例6:4。     

脱氢醋酸钠及其复配形式在食品中的防腐应用研究

脱氢醋酸钠是一种广谱性抑菌力极强的食品防腐剂,对霉菌、细菌、酵母的抑制能力尤强.本文系统地研究了脱氢醋酸钠及其复配形式在面制品、肉制品、豆制品中的防腐应用,结果表明单一防腐剂处理,脱氢醋酸钠的抑菌能力优于山梨酸钾、双乙酸钠、丙酸钙;复配形式以脱氢醋酸钠与月桂酸单甘油酯为主体,配以山梨酸钾或丙酸钙、双乙酸钠,其防腐效果较单一防腐剂效果好.     

脱氢醋酸钠及其复配形式在食品中的防腐应用研究

脱氢醋酸钠是一种广谱性抑菌力极强的食品防腐剂,对霉菌、细菌、酵母的抑制能力尤强.本文系统地研究了脱氢醋酸钠及其复配形式在面制品、肉制品、豆制品中的防腐应用,结果表明单一防腐剂处理,脱氢醋酸钠的抑菌能力优于山梨酸钾、双乙酸钠、丙酸钙;复配形式以脱氢醋酸钠与月桂酸单甘油酯为主体,配以山梨酸钾或丙酸钙、双乙酸钠,其防腐效果较单一防腐剂效果好.     

保鲜剂在湿玉米面条应用研究

湿玉米面条是当今广受人们喜爱食品,但由于其水分含量高,导致在常温下容易发霉变质,不能长时间保存。研究和探讨几种防腐保鲜剂：双吸剂、乳酸链球菌素、优利、脱氢醋酸钠、丙酸钙等在常温下对湿玉米面条防腐保鲜效果,结果表明：几种防腐保鲜剂均具有一定防腐保鲜作用,并以Nisin0．1g/kg+优利0．5g/kg+丙酸钙0．315g/kg为最佳；脱氢醋酸钠0．5g/kg+丙酸钙0．4g/kg次之；而双吸剂无论单独使用或结合以上几种防腐保鲜剂同时使用,都具有良好保鲜效果,保鲜期可达2个月。     

栅栏技术在面包防腐中的应用

应用栅栏技术,对面包的水分活度(甘油和山梨糖醇)、复配防腐剂(脱氢乙酸钠与丙酸钙复配)和复合充气包装(二氧化碳与氮气复配)3个栅栏因子进行研究,以贮存时间和感官评分为指标,确定面包保存的最佳栅栏条件。通过正交实验,得到最佳栅栏条件:水分活度(甘油2%、山梨糖醇4%)、脱氢乙酸钠与丙酸钙复配比例2∶3、二氧化碳与氮气的充气比例1∶2。通过试验验证,在此条件下,面包贮存时间最长为61天。     

几种防腐剂对面包蛋糕防霉作用的比较

本文以面包、蛋糕为材料,对六种防腐剂的防霉作用进行了比较。试验结果表明,所用的防腐剂都具有一定的防霉作用,在生产当中适当的选择防腐剂对防止面包、蛋糕的霉变是很重要的,并着重报道了效果较好的丙酸钙、丙酸钠和脱氢醋酸的作用。     

An internet compendium of analytical methods and spectroscopic information for monomers and additives used in food packaging plastics

An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.     

Detection of adulteration of locust bean gum with guar gum by capillary electrophoresis and polarized light microscopy

Capillary electrophoresis (CE) and polarized light microscopy (PLM) were utilized in the detection of the adulteration of locust bean gum with guar gum. For CE analyses, standards of locust bean and guar gums were extracted with 30% CH₃CN, removing the residual proteins from the gum matrix. A 8.75 mM NaH₂PO₄-20.6 mM Na₂B₄O₇ buffer, pH 9, was used to separate these proteins and to identify marker proteins that were present in the guar gum. These markers did not co-migrate with components in the extracts of mechanically processed locust bean gum, and are used as indicators of adulteration. Using PLM with toluidine blue and iodine staining techniques, unadulterated locust bean gum samples were distinguished from mixed samples through the differential staining of components in locust bean versus guar and tara gums. These experiments in the use of CE and PLM provide orthogonal and complementary methods for the verification of 'true' positives and the elimination of 'false' positives.     

10—THE WRINKLING BEHAVIOUR OF WOOL FABRICS: THE EFFECT OF ANNEALING AND CROSS-LINKING

An investigation is described in which various polyfunctional compounds were applied to wool in attempts to stabilize the temporary improvements in wrinkle-recovery brought about by ‘annealing’. Several reactive systems involving formaldehyde were found to produce the desired permanently improved wrinkle-recovery.     

Excellent Enterprises:keep on leading technology

正As a biennial industry event,ITMA ASIA+CITME2014 has attracted leading enterprises within global textile industry from Europe,American and Japan etc..To showcase the comprehensive development of oversea enterprises,The Textile Machiney Magazine has selected representative enterprises ranging from spinning,weaving,chemical fiber,knitting,nonwovensindustrial,accessories,dyeing and printing,to exhibit their advanced technology and equipment.In the era that global textile industry have ushered a new round     

"National Strategy on Adaptation to Climate Changes" Issued

On November 18th, 2013, the ＂National Strategy on Adaptation to Climate Changes＂ （hereafter referred to as the ＂The Strategy＂ ） jointly formulated by Nationa Development and Reform Commission, Ministry of Finance Ministry of Housing and Urban-Rural Development Ministry of Transport, Ministry of Water Resources, Ministry of Agriculture, Bureau of Forestry, China Meteorologica Administration, and State Oceanic Administration was issued by the agencies with an announcement on the issuance.     

Ministry of Industry and Information Technology Confirmed 2014 Main Expected Targets for Energy-Saving and Comprehensive Utilization

Ministr y of Industr y and Information Technology confirmed that the main expected targets for energysaving and comprehensive utilization in 2014 are：energy consumption and CO2 emissions per unit of industrial added-value decreases by 4.5%,water consumption per ten thousand Yuan of industrial added-value decreases by7%,comprehensive utilization of industrial solid waste is further improved,and pollution emissions in key industries is markedly reduced.     

2013 Annual Report of China's Paper Industry

According to the survey made by China Paper Association （CPA）, in 2013, there were about 3,400 paper ＆ board manufacturers. The total production and consumption of paper ＆ board were 101.10 million tons and 97.82 million tons, decreased by 1.37% and 2.65% compared to the previous year respectively; paper ＆ board per capita consumption was 72 kg. From 2004 to 2013, the average annual growth rate of paper ＆ board production was 8.26%, and the average annual growth rate of paper ＆ board consumption was 6.74%. As shown in Fig. 1.     

2014 China International Paper Technology Exhibition and Conference （CIPTE） Will Be Held in Shanghai

In order to promote the development of China＇s paper industry, display the technical achievements of a conlmu of paper nication paper industry, and provide platform for the enterprises and relative industries, China Paper Association,     

Distribution and stability of aflatoxin M1 during processing, ripening and storage of Telemes cheese

Telemes cheeses were produced using milk that was artificially-contaminated with aflatoxin M1 at the levels of 0.050 and 0.100 microg/l. The cheeses produced in the two cheese-making trials were allowed to ripen for 2 months and stored for an additional 4 months to simulate commercial production of Telemes cheese. Concentrations of aflatoxin M1 in whey, curd, brine, and the produced cheeses were determined at intervals by liquid chromatography and fluorometric detection coupled with immunoaffinity column extraction. Concentrations of aflatoxin M1 in the produced curds were found to be 3.9 and 4.4 times higher than those in milk, whereas concentrations in whey were lower than those in curd and milk. Aflatoxin M1 was present in cheese at higher concentrations at the beginning than at the end of the ripening/storage period, and it declined to concentrations 2.7 and 3.4 times higher than those initially present in milk by the end of the sixth month of storage. Concentrations of aflatoxin M1 in brine started low and increased by the end of the ripening/storage period but only a portion of the amounts of aflatoxin M1 lost from cheese was found in the brine. Results showed that Telemes cheeses produced from milk containing aflatoxin M1 at a concentration close to either the maximum acceptable level of 0.05 microg/l set by the European union (EU) or at double this value, will contain the toxin at a level that is much lower or slightly higher, respectively, than the maximum acceptable level of 0.250 microg of aflatoxin M1/kg cheese set by some countries.     

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.