甜高粱茎秆及其籽粒固态发酵酒精的研究

以含糖量为11 g/100 g的甜高粱秸秆为原料,采用固态发酵生产乙醇.工艺条件为:秸秆采用揉搓切碎机切至1～2 cm,籽粒粉碎至60目,0.1 MPa灭菌30min,接种10%的酵母种子,28℃静置培养48 h.发酵醅酒精含量为5 g/100 g以上,平均酒精得率87.9%.添加20%籽粒淀粉发酵,发酵后酒精含量达9 g/100 g以上,平均酒精得率89.5%.(孙悟)     

甜高粱秆固态发酵制取酒精的研究

甜高粱秆液态发酵中,存在着榨汁难,糖分损失严重等问题.采用固态发酵的方式,进行了甜高粱发酵酒精的研究,确定了发酵过程中发酵时间、接种率、初始pH、营养盐等因素的优化方案.将总糖含量为13%,含水量约80%的甜高粱秆直接绞碎至约0.3cm长,在最佳优化条件下35℃固态发酵24h,酒精的理论产率为0.332g乙醇/g甜高梁秆干料,实际得率为0.298g乙醇/g甜高梁秆干料(达到理论产率的89.8%),生产1t酒精需要3.01t的甜高粱秆干料.     

甜高粱秸秆榨汁发酵实验研究

对以甜高粱秸秆榨汁的酒精发酵、原汁的保存期进行了研究.结果表明,调整原汁的酸度,能够防止杂菌污染,在29℃恒温条件下,可延长甜高粱榨汁的保存期至2～3d;耐高温活性干酵母的加量为0.1g/100 mL,并可实现甜高粱秸秆榨汁的浓醪发酵;发酵时间控制在28h左右;高糖度发酵醪含糖量为20.6 g/100 mL,成熟醪酒精度达12.8%vol.     

甜高粱秸秆固态发酵生产燃料乙醇的工艺研究

利用选育的耐酸耐高温酵母Q-10,采用甜高粱秸秆固态发酵生产燃料乙醇.当接种量为5%,发酵温度34℃,发酵起始pH4.0,糖化酶和纤维素酶用量分别为50U/g原料和20U/g原料,发酵周期4d时,乙醇体积分数达到6.5%.小试试验乙醇体积分数达到6.4%.工业试验乙醇体积分数达到6.0%.     

甜高粱秸秆发酵菌种的诱变育种及其固态发酵工艺的研究

以耐酒精高活性干酵母为原始出发菌株进行60Co-γ辐射诱变处理,经逐级筛选和300g甜高粱秸秆固态发酵,确定H13为最佳诱变菌种;并对H13菌株的甜高粱秸秆固态发酵工艺进行研究,结果表明,粉碎后的甜高粱秸秆300g,5‰的菌体接种量、68％的基质含水量、36℃条件下发酵60h,乙醇产率达6.4g/100g鲜秸秆.     

甜高粱秆固态发酵制乙醇条件的优化及优势菌种的选择

以甜高粱秸秆为原料,采用固态发酵工艺,对3株酵母菌进行了不同温度、pH值和不同接种量的比较试验.选出适于甜高粱秸秆发酵的优良菌株No.1,其最佳发酵条件为温度36%,pH5.0,接种量1.0mL/g,发酵周期为24h.     

混合菌糖化发酵甜高粱秸秆的研究

为得到糖化降解甜高粱秸秆最优的条件,甜高粱秸秆进行NaOH处理后,利用多种分解纤维素的菌种进行混合发酵。结果发现,白腐菌、黑曲霉和康宁木霉组合发酵NaOH处理过的秸秆,其降解率最高,糖化率达到3.19mg/mL。     

菌酶协同发酵甜高粱秸秆工艺的优化

以产朊假丝酵母、黑曲霉混菌为发酵菌种,添加木聚糖酶、纤维素酶,探究菌酶协同发酵对高粱秸秆营养价值的改善效果。试验以甜高粱秸秆粉为原料,通过添加不同酶,比较单一酶、混合酶对发酵后秸秆中蛋白质含量的影响。通过单因素试验和正交试验,优化菌酶协同发酵高粱秸秆生产蛋白质饲料的条件,考察发酵时间、酶菌比例、pH值和发酵温度对高粱秸秆发酵饲料粗蛋白质含量的影响。得出了最佳发酵条件为:发酵时间5 d,酶菌混合比例1∶3,pH 4.5,温度40℃。在此条件下,发酵产品的粗蛋白质质量分数达15.51%,菌酶协同处理可以提高甜高粱秸秆的饲用品质。     

甜高梁秆固态发酵制取酒精的研究

甜高粱秆液态发酵中，存在着榨汁难，糖分损失严重等问题。采用固态发酵的方式，进行了甜高粱发酵酒精的研究，确定了发酵过程中发酵时间、接种率、初始pH、营养盐等因素的优化方案。将总糖含量为13％，含水量约80％的甜高粱秆直接绞碎至约0．3cm长，在最佳优化条件下35℃固态发酵24h，酒精的理论产率为0．332g乙醇／g甜高粱秆干料，实际得率为0．298g乙醇／g甜高粱秆干料（达到理论产率的89．8％），生产It酒精需要3．01t的甜高粱秆干料。     

乙醇及发酵废液预处理秸秆条件的研究

利用酒精厂的乙醇发酵废液对小麦秸秆进行预处理,处理液仍在本厂回收后再利用,这样有助于降低预处理成本,促进纤维素乙醇的发展。经实验,处理小麦秸秆的最佳条件为乙醇、杂醇油体积比为1∶1,处理温度110℃,处理时间为200min,处理后的秸秆酶解率达到83.3%,比直接酶解高出近50%,但由于纤维糖化液中抑制发酵成分的存在,使得发酵的酒精度只有6%左右。     

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).