兴安杜鹃花色素的提取工艺

以柠檬酸为提取剂从兴安杜鹃花中提取天然色素。探讨提取剂浓度、提取温度、提取时间、液固比等因素对兴安杜鹃花色素提取效果的影响,通过L9(34)正交试验确定了最佳提取条件。结果为提取剂浓度2%、提取温度50℃、提取时间1 h、液固比10:1(mL:g)。     

火龙果果皮色素提取工艺及稳定性研究

以红皮白肉火龙果为原料,采用溶剂萃取法探讨不同萃取剂、料液比、时间、温度、pH对其色素提取率的影响;同时研究不同温度、pH、光照、糖浓度、盐浓度、金属离子及氧气对该色素稳定性的影响.结果表明,火龙果果皮色素最适提取工艺条件:萃取剂为蒸馏水,料液比1∶20(m∶V),提取时间50 min,提取温度30℃,提取pH 6.火龙果红色素的热稳定性差,温度越高越不利于色素稳定;pH在5～6时色素最稳定;光照和氧气都可降低色素的稳定性;糖和食盐对色素稳定性影响不显著;Ca2+可降低色素的稳定性,Zn2+有护色作用,K+、Fe2+、Mg2+对色素稳定性的影响不显著.     

超声波辅助提取大花金鸡菊花色素及其稳定性研究

以新鲜大花金鸡菊(Coreopsis grandiflora)花瓣为原料,采用超声波提取法对大花金鸡菊花色素的提取条件及理化性质进行研究。结果表明,大花金鸡菊花色素提取最佳工艺条件为:乙醇体积分数70%、料液比1∶5(w/v)、提取温度30℃,提取时间20min。大花金鸡菊花色素耐酸碱和耐氧化、还原性物质。常用的食品添加剂(葡萄糖、氯化钠等)以及金属离子Na+、Cu2+、Mg2+、Ca2+等对色素无明显影响。     

五味子色素的提取工艺优化及其稳定性研究

以五味子色素提取液中花色素苷含量为指标,乙醇浓度、提取时间、料液比、提取温度为考察因素,在单因素实验基础上利用响应面方法优化五味子色素提取工艺,并以色素色度为指标,研究五味子色素的稳定性。结果表明,以55%浓度乙醇为提取液,按1∶20 g/mL的料液比,在80℃下提取80 min,五味子色素提取量最大,为11.89 mg/L。五味子色素稳定性实验表明:五味子色素光稳定性较好;蔗糖、抗坏血酸对色素有稳定、增色作用;五味子色素易被双氧水氧化;在酸性、中性和弱碱性条件下五味子色素较稳定,强碱条件下颜色改变;Ca2+、Mg2+、Na+、K+对色素稳定性无明显影响,Al3+对色素稳定性有破坏作用,Fe3+、Cu2+对色素稳定性有保护作用。     

红菇色素超声波提取及其稳定性和抗氧化性研究

研究了超声波辅助提取红菇色素的最佳工艺条件及其稳定性和抗氧化性。实验结果表明:最佳提取条件为:料液比1∶40(g∶m L),超声时间60 min,乙醇体积分数45%,超声功率550 W。色素的稳定性研究表明:色素在低温条件下稳定,但耐光性较差,葡萄糖、Na2+存在利于色素稳定,柠檬酸、K+、Cu2+、Mg2+、Zu2+、Ca2+影响色素稳定性。抗氧化性研究表明:红菇色素具有较强的清除羟自由基、超氧阴离子自由基和DPPH自由基的能力。     

辛夷色素的提取和稳定性研究

采用单因素试验及L(934)正交试验,以辛夷色素的吸光度为指标,研究了辛夷色素提取条件和稳定性,并通过单因素递变法结果校正,得到了辛夷色素提取的最佳工艺条件:1∶15的料液比,65℃提取2次,每次60min的提取效率最好;该色素属于水溶性色素,pH值对色素影响明显;金属离子Al3+、Ba2+、Na+、Ca2+、K+、Mg2+对色素色泽无影响,Cu2+、Fe3+对其稳定性有不良影响;温度对色素影响不大;紫外光对色素影响较大;色素抗还原能力较差而耐氧化性能较好;蔗糖、食盐和淀粉添加剂对色素无影响。     

水蜡果实色素的提取及色素性质的研究

以水蜡果实为原料,对影响果实中色素的提取条件进行了比较,另对水蜡色素性质进行了研究,结果得出:提取水蜡果实色素的最佳条件为提取剂C2H5OH 30%、提取温度75℃、固液比1∶10(mg/m L)、提取时间90 min;水蜡色素对光的稳定性差,食盐对色素的性质无影响,水蜡色素的抗氧化性差,Na2SO3对水蜡色素具有较强的还原性,Fe3+、Cu2+两种金属离子容易引起水蜡色素褪色。     

玫瑰花色素的提取工艺及其稳定性研究

以玫瑰花为原料,通过单因素试验和正交试验确定提取玫瑰花色素的工艺条件,并探讨玫瑰花色素的稳定性。结果表明,玫瑰花色素的最佳提取工艺条件为以40%乙醇作为提取剂,提取温度70℃,提取时间4 h,料液比为1∶40(g/mL)。玫瑰花色素稳定性试验表明:玫瑰花色素在酸性条件下较稳定,少量低浓度的氯化钠、蔗糖、柠檬酸、抗坏血酸和亚硫酸氢钠对玫瑰花色素有稳定增色的作用,玫瑰花色素在贮存过程中应尽量避免接触Fe~(2+)、Cu~(2+)及强氧化还原剂。     

密蒙花黄色素的提取及其稳定性研究

研究了密蒙花中天然黄色素提取的最佳工艺条件及其在不同条件下的稳定性。采用单因素和正交实验研究黄色素的最优提取工艺条件;分析其在不同p H值、温度、光线条件以及与常见金属离子、氧化剂、还原剂、糖等物质共存时黄色素的稳定性。结果表明,最佳的提取条件为:乙醇体积分数是60%,提取温度为60℃,提取时间为2.5 h,液料比为1∶50。密蒙花黄色素在p H2~8时较稳定,对高温比较敏感,在日光下较不稳定;对还原剂较敏感,有一定的抗氧化能力;对金属离子K+、Na+、Ca2+、Mg2+、Zn2+、Al3+、Cu2+比较稳定,对Fe3+和Pb2+不稳定;葡萄糖、蔗糖、麦芽糖、苯甲酸钠等常用食品添加剂对黄色素的稳定性无明显影响。可为密蒙花黄色素作为食用色素提供科学依据。     

紫叶酢浆草色素的提取及性质研究

研究紫叶酢浆草色素的提取条件和理化性质,结果表明:用料液比13∶0(g/mL)、pH1(10%盐酸调)的95%乙醇作提取剂、在70℃恒温浸提40min,提取效率较好。紫叶酢浆草色素属花青素类色素,pH值对色素影响明显,在酸性条件下色泽稳定且具有热稳定性;光照能加快色素降解;金属离子Na+、Ca2+、A13+、Cu2+、Zn2+对色素色泽无影响,而Fe3+、Pb2+有不良影响;色素的抗氧化还原性能较差;蔗糖、葡葡糖和盐等添加剂对色素无影响。急性毒性试验中白鼠无异常表现。     

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     

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     

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,     

Anti-mutagenic compounds from corn

In previous studies with aflatoxin-contaminated corn an uncharacteristic response for AFB₁ in the Salmonella/microsomal mutagenicity assay (Ames test) was observed and the presence of anti-aflatoxin factors in the corn was suggested. In the current study, corn was extracted and fractionated using thin layer chromatography (TLC) using different developing solvent systems and the Ames test was used to monitor for anti-mutagenic activity in the corn fractions. Both Salmonella tester strains TA98 and TA100 with metabolic activation (S9) were used. Several corn fractions, at different stages in the isolation and purification process, showed anti-mutagenic dose-responses when exposed to pure AFB₁. Corn extracts were non-toxic to the tester strains and TLC fractions that showed the best anti-mutagenic dose-responses were selected for further partial characterization analyses.