混合菌种生物转化甘薯原料为菌体蛋白的饲料的研究注

通过少孢子根霉和树状假丝酵母混合菌种的直接生物转化,由甘署原料制得了菌体蛋白饲料。在较佳培养条件下,经２８℃浅盘发酵７２ｈ,产物干基粗蛋白含量为２２．１％,采用自制固态生物反应器２８℃固态发酵４８ｈ,每１００ｇ革薯粉可得８２．８ｇ发酵产物（折干）,其粗蛋白含量为１５．９％,每ｇ湿料中酵母数为３６亿个,氨基酸含量较原料提高１倍。甘薯原料经混合菌种于１０１外循环气升式发酵罐液态发酵４８ｈ后,培养液中菌     

混菌株固态发酵高温豆粕工艺优化

选出最佳的菌种组合黑曲霉、酿酒酵母菌、枯草芽孢杆菌、植物乳酸杆菌后,调整混合菌种比例为2∶2∶1∶1,菌株进行固态发酵高温豆粕的最佳工艺条件:接种量10%,料水比1∶3,发酵时间96 h,发酵温度33℃,p H7.0,Mg SO4·7H2O 0.04 g,Ca Cl20.02 g,KH2PO40.04 g。粗蛋白含量为54.22%,比原料豆粕中的增加了24.36%。抗原蛋白7S球蛋白亚基和11S酸性亚基大部分被混合菌株分泌的酶系降解为分子质量更小的蛋白亚基;氨基酸含量由发酵前的41.53%提高到的48.18%;胰蛋白酶抑制剂(TI)含量由发酵前的16.91 mg/g降到0.20 mg/g,粗蛋白和氨基酸含量大幅度提高,抗原蛋白大部分被降解,TI含量显著降低,营养价值得到了很大改善,且发酵产物有豆香味、黄褐色。     

微生物转化麦芽根为蛋白饲料的研究

通过组合发酵确定黑曲霉、产朊假丝酵母、扣囊拟内孢霉为发酵麦芽根生产酸性蛋白酶蛋白饲料的最佳菌种组合,发酵培养基组成为麦芽根85%,麸皮15%,（NH4）2SO43%,pH5.5,含水量65%;发酵工艺为培养周期74h,两层纱布覆盖,30℃培养,接种量10%,发酵产物酸性蛋白酶活力达6489u/g(干基）,粗蛋白含量可达34.24%,比所用培养基粗蛋白含量提高36.3%,比原料本身粗蛋白含量提高50.3%,发酵产物粗纤维含量比原料下降32%。     

固态发酵马铃薯渣生产菌体蛋白饲料的研究

以马铃薯淀粉生产中产生的废渣为主要原料,以黑曲霉、白地霉和热带假丝酵母为发酵菌种,优化了马铃薯薯渣固态发酵生产菌体蛋白饲料的发酵工艺,初步确定了薯渣固态发酵的适宜条件,即采用自然pH值,物料质量比(薯渣:麸皮)为90:10(w/w),发酵温度32℃,发酵时间66h,在此条件下发酵饲料中粗蛋白含量较高.     

红芪药渣固态发酵生产蛋白饲料工艺条件优化

以红芪药渣为原料,利用白腐菌（Phanerochaete chrysosporium）/产朊假丝酵母（Candida utilis）混合菌种对其进行固态发酵生产蛋白饲料。采用单因素和正交试验,研究了氮源添加量、装料量、水含量、发酵时间对发酵效果的影响,确定了红芪药渣固态发酵生产蛋白饲料的最佳工艺条件为：（NH4）2SO4添加量30 mg/g干药渣、装料量50%、水分含量2.0 g/g干药渣、发酵时间5 d、发酵温度30 ℃,在上述发酵条件下,发酵产物中真蛋白含量达19.05%,比原来提高了101.16%;粗纤维含量达19.94%,比原来降低了34.79%。利用复合菌固态发酵中药渣,可降低发酵产物中粗纤维含量,同时提高真蛋白含量,为中草药下游产品的开发和应用提供科学依据。     

复合酶降解高温蒸煮玉米秸秆的饲料化研究

利用复合酶在其最优条件下降解高温蒸煮玉米秸秆,然后接入混合酵母同步发酵产菌体蛋白.确定了复合酶降解的最优条件:4g底物(蒸煮秸秆3.072g)加入30mL pH4.8柠檬酸缓冲液,调pH4.8,121℃灭菌20min,待冷却,无菌操作下加入25mg纤维素酶、10mg木聚糖酶、6mg β-葡聚糖酶、1.3mg果胶酶,在50℃、100r/min条件下酶解16h,产糖量0.9349g/30mL.混合酵母发酵实验结果表明.玉米秸秆粗蛋白含量为27.125%,是原秸秆蛋白含量的4.13倍,效果显著,酶用量低,发酵周期短.     

多菌种分步固态发酵果渣生产菌体蛋白饲料的工艺优化

实验研究了多菌种分步固态发酵果渣生产菌体蛋白饲料的工艺条件,以果渣为主要原料,麸皮、豆粕、谷糠等为辅料,通过对多菌种(黑曲霉、产朊假丝酵母、热带假丝酵母和酿酒酵母)接种及培养方法、菌液的接种量、发酵的最佳温度、共发酵时间、固液比及物料酸碱度因素的优化研究,获得了优化后的多菌种分步固态发酵果渣生产菌体蛋白饲料生产工艺。通过单因素试验及正交试验,确定最佳发酵条件为固液比60%,初始pH5.5,温度30℃,黑曲霉的接种量为7.50%,复合酵母液的接种量为10%,黑曲霉在发酵初期接入,复合酵母液在发酵24h后接入,共培养时间为72h。在最佳菌种配比和发酵条件下,发酵终产物的粗蛋白质含量从4.97%增加至27.60%,增长了22.63个百分点,达到优质蛋白饲料标准。     

太空诱变复合菌剂发酵苹果渣生产菌体蛋白的研究

试验利用太空诱变获得的优良菌种一黑曲霉ZM-8和啤酒酵母、热带假丝酵母以及白地霉复配制成复合菌剂,固体发酵苹果渣,得到的菌体蛋白中纤维素含量降低,粗蛋白含量显著提高,营养价值增加.通过正交试验获得了最适的培养基配方和复合菌剂的最佳配方.试验确定的最适培养基配方为白糖4g,硫铵7g,尿素1g,食盐2g,产物中粗蛋白的含量达26.4%,提高了306.3%.复合菌剂的最佳配方为黑曲霉突变株ZM-8(Asp.niger ZM-8)1.5g,酿酒酵母(Saccharomyces cerevisiae)0.5g,热带假丝酵母(Candida tropicalis)1.0g,白地霉菌(Gcotrichum candidum)0.5g,产物中粗蛋白的含量达27.9%,提高了337.5%.     

餐厨垃圾制备生物蛋白饲料的研究

以餐厨垃圾作为原料,利用混合菌种对其进行固态发酵,转化为菌体蛋白饲料,从而为餐厨垃圾资源化提供一条有益的途径。本试验以发酵时间、发酵温度、基质初始含水率、添加菌种量进行4因素3水平正交试验,最佳工艺条件为发酵时间2 d,发酵温度30℃,基质初始含水率70%,添加菌种量0.031 25%。按最佳条件发酵餐厨垃圾,最终所得产物粗蛋白质质量分数为28.74%,蛋白质含量已达到蛋白饲料标准的要求。     

鱼汁豆粕混合物限定混菌固态发酵工艺的研究

研究限定枯草芽孢杆菌和乳酸杆菌固态发酵鱼汁和豆粕的混合物，转化饲料多肽。以可溶性多肽含量和胰蛋白酶抑制因子（TI）的降解率为检测指标，通过正交实验确定其最佳发酵条件为：发酵温度35℃，接种量8%，豆粕与鱼汁浓缩液（粗蛋白含量20%）质量体积比（g/mL）1∶1，发酵时间60 h。对最佳发酵条件下的产物品质进行检测，其中可溶性多肽含量达到23.54%，TI降解率为93.4%，益生菌数量达8.7×10⁹ CFU/g。通过对比发酵原料和产物，结果表明鱼汁和豆粕混合物经混合菌发酵后，其品质得到明显改善。     

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     

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.     

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     

Contamination of animal feed and food from animal origin with mineral oil hydrocarbons

Oils and fats used for the production of animal feed can become contaminated with mineral oil material originating from gas oils (C₁₈-C₃₅) or synthetic oils (poly alpha olefins, C₂₅ to beyond C₄₅). An important cause is assumed to be the discharge of waste oils, such as motor oil and hydraulic oils. Mineral oil material was analysed by on-line LC-GC-FID directly in the fat or in a raw extract from animal feed or foodstuffs. In Switzerland in summer/autumn 1999 concentrations in oils and fats for feed production were often found to be between 100 and 1000mg/kg. In the feeds, the average concentration was around 100mg/kg with values ranging up to a maximum of 1000mg/kg; few samples were free of contamination. In animal body fat, the average concentration determined in summer 1999 was 25mg/kg, with a maximum of 150mg/kg, although in samples from December 1999, contamination was substantially lower. In the fat phase of eggs, the average concentration was 30mg/kg, with a maximum of 80mg/kg. Paraffin oil is used for feed production, which may account for part of the contamination problem (e.g. eggs).