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1.
《食品工业科技》2017,(22)
采用大孔吸附树脂对黑果枸杞中的原花青素粗提液进行纯化。以吸附能力和解吸附能力为指标,考察了AB-8,D130,D101,HPD100,D101-1和聚酰胺6种树脂对原花青素的纯化效果;以解吸能力为指标,考察洗脱剂体积分数、洗脱流速对洗脱效果的影响。结果表明,以D101树脂可用于黑果枸杞中原花青素的纯化,静态吸附以后,使用95%的乙醇,在2.5 BV/h的洗脱速度下,用4.0 BV进行洗脱,原花青素纯度由31.33%提高至68.03%;通过乙酸乙酯萃取可制得低聚原花青素样品,其平均聚合度由8.98降低至3.17,用HPLC方法可检测到低聚物中含有儿茶素、表儿茶素、原花青素B2等重要的原花青素单体和低聚物,根据峰面积计算三种物质的总含量达18.73%。 相似文献
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3.
山楂叶总黄酮的水浸提和纯化工艺研究 总被引:5,自引:0,他引:5
研究山楂叶总黄酮的水浸提和大孔吸附树脂纯化耦合工艺.重点探讨采用水浸提法提取山楂叶总黄酮的最佳工艺条件.试验结果表明:山楂叶黄酮类化合物的最优水提工艺参数是料液比为1:20(g/mL).浸提时间为120 min,提取次数2次.在此条件下进行回流提取,山楂叶总黄酮的提取率达到87.2%.采用水浸提法与D101型大孔吸附树脂耦合时山楂叶总黄酮进行吸附纯化.该树脂对总黄酮的动态吸附率大于80%,稳定性试验重复次数为5,以体积分数70%乙醇为洗脱剂时解吸率大于86%.山楂叶总黄酮经上述工艺分离纯化后,得率为1.9%,纯度为82.8%. 相似文献
4.
为了筛选出对紫玉米花青素粗提液纯化性能好的树脂,采用AB-8型、X-5型、D101型和NKA-9型4种大孔树脂对紫玉米花青素进行静态吸附和解吸实验,研究了大孔树脂对紫玉米花青素的静态吸附动力学曲线,以Langmuir单层吸附方程制定吸附等温曲线,并研究了不同pH条件下对大孔吸附树脂吸附的影响及不同树脂的解吸特性。结果表明:X-5树脂吸附平衡速率常数最大,达到饱和吸附量所用时间最短,经Langmuir单层吸附回归方程预测出X-5树脂静态吸附时最大吸附量可达到53.1915mg/g。在pH=4时,饱和吸附量最大。因而X-5可用做纯化紫玉米花青素较为合适的吸附剂,解吸时宜选用40%乙醇做为洗脱液。 相似文献
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为确定大孔树脂对山楂黄酮的分离效果,比较了10种大孔吸附树脂对山楂黄酮的静态吸附效果,在确定了适合的大孔树脂后,通过进一步的动态吸附过程分析,确定D101树脂适合于山楂黄酮的吸附,其静态吸附率为88.1%,解吸率为92.9%。并对其动态吸附特性进行了研究,确定的最佳工艺参数为:进样黄酮浓度18.75mg/mL、pH3~4、上样流速1BV/h、洗脱液乙醇体积分数75%、洗脱液流速1BV/h;上样量达到6BV时,树脂达到吸附平衡,当洗脱液用量为3BV,达到洗脱终点。经D101树脂在最佳工艺条件下纯化后,所获得纯化产物中芦丁、金丝桃苷和槲皮素的总含量达到65.47%,回收率为86.22%。 相似文献
6.
大孔吸附树脂纯化葡萄籽原花青素的研究 总被引:3,自引:2,他引:3
通过对6种大孔树脂的静态吸附和动态吸附试验,选择HPD600和HPD450两种大孔树脂做柱层析。分析结果表明:HPD600为吸附葡萄籽原花青素的最佳树脂,以上样流速为0.41mL/min,洗脱流速为0.38mL/min时的纯化效果最好,原花青素的纯度达到了95%。 相似文献
7.
以柑橘柠檬苦素为考察指标,研究大孔树脂分离纯化柠檬苦素的工艺条件。结果表明,D101大孔树脂对柑橘柠檬苦素有较好的吸附分离性能,是分离纯化柑橘柠檬苦素的适宜大孔树脂;D101大孔树脂分离纯化柑橘柠檬苦素的最佳工艺条件为:上样流速1?m L/min、上样质量浓度0.5?mg/m L、用p H 6、80%的乙醇溶液作洗脱剂、洗脱流速2?m L/min。通过树脂回收重复使用,发现D101树脂通过再生处理后,其吸附性能未有明显降低,可以重复使用。采用上述方法得到D101大孔树脂对柠檬苦素的吸附率为88.53%,解吸率为93.47%,得率为82.75%。高效液相色谱检测可知,柠檬苦素的含量达到了92.79%。 相似文献
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《食品与发酵工业》2016,(1):108-113
比较6种不同极性大孔树脂对核桃青皮提取物中胡桃醌的静态吸附和解吸性能,筛选出最佳的大孔树脂。通过与胡桃醌标准品HPLC保留时间相比较的方法对胡桃醌含量进行分析。结果表明:D101树脂为纯化核桃青皮胡桃醌的最佳树脂,较佳的动态吸附条件为上样液胡桃醌浓度0.114 mg/m L,p H 2.0,上样速率为1.0 m L/min,吸附率可达81.85%;较佳的洗脱条件为体积分数95%的丙酮,p H 4.0,洗脱速率为0.33 m L/min,解吸率为76.5%。经HPLC鉴定和分析,D101分离纯化核桃青皮胡桃醌不会造成组成变化和较大损失。D101大孔树脂对核桃青皮胡桃醌有较好的分离纯化效果。 相似文献
9.
采用大孔吸附树脂对鸡血藤原花青素进行纯化,并对原花青素纯度、1,1-二苯基-2-三硝基苯肼(1,1-diphenyl-2-picrylhydrazyl,DPPH)自由基清除活性及α-葡萄糖苷酶抑制活性进行评价。比较3种大孔吸附树脂对原花青素静态吸附及解吸附能力,从D101、X-5及AB-8树脂筛选出X-5型树脂用于纯化。对X-5型树脂的动态吸附及解吸附条件进行优化,获得最适条件为:上样质量浓度6.00 mg/mL,上样流速2 BV/h,上样量10 BV,洗脱流速1 BV/h,洗脱剂用量2 BV。利用不同体积分数乙醇洗脱可得到不同纯度的原花青素,其中70%乙醇纯化物原花青素纯度最高,具有最强的DPPH自由基清除活性及α-葡萄糖苷酶抑制活性。相关性分析表明原花青素可能是鸡血藤抗氧化及抑制α-葡萄糖苷酶的主要活性成分。 相似文献
10.
火龙果皮原花青素提取纯化及定性分析 总被引:2,自引:0,他引:2
采用大孔树脂对原花青素粗品进行分离纯化。比较了AB-8、DM130、ADS-17三种大孔树脂对原花青素的吸附和解吸能力,选择AB-8型大孔树脂为吸附树脂。对AB-8大孔树脂吸附解吸条件进行优化,探讨上样流速、解吸流速和解吸剂体积分数3个因素对分离纯化效果的影响。结果表明:AB-8大孔树脂提纯工艺的最佳条件为上样流速2 m L/min、解吸流速1 m L/min、解吸剂体积分数50%。通过花青素反应与高效液相色谱-质谱对提取物进行定性分析,证实该提取物中含有的原花青素为儿茶素、表儿茶素和二聚体,且原花青素纯度为96.65%。 相似文献
11.
Textural Properties of Cold-set Gels Induced from Heat-denatured Whey Protein Isolates 总被引:2,自引:0,他引:2
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. 相似文献
12.
Anne Theobald Catherine Simoneau Philippe Hannaert Patrizia Roncari Anna Roncari Thomas Rudolph Elke Anklam 《Food Additives & Contaminants》2000,17(10):881-887
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. 相似文献
13.
A. Boenke 《Food Additives & Contaminants》2001,18(12):1135-1140
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. 相似文献
14.
为研究低温带皮菜籽粕微粉的不同粒级部分的功能特性,以经低温脱脂的带皮菜籽粕为原料,经微粉碎后筛分成212~425μm、150~212μm和106~150μm的3个不同粒级的微粉样品,检测这些样品的吸水性、吸油性、乳化性和乳化稳定性、蛋白质体外消化率。结果表明:1 3个不同粒级的微粉样品之间的粗纤维含量存在显著差异,表明三者的结构组成成分有一定差异。23个微粉样品的乳化活性和乳化稳定性随粒度级别的减小而显著增加(P0.01)。33个微粉样品的蛋白质体外消化率随粒度级别的减小而显著增加(P0.01)。4不同粒级带皮菜籽粕微粉样品的吸水性与吸油性受其结构组成物质不同和粒度的双重影响,与粒度的相关性不明显。 相似文献
15.
Microbiology of food taints 总被引:2,自引:0,他引:2
Fresh and processed foods are often spoilt by the presence of undesirable flavours and odours caused by microbial action. The aim of this paper is to review the current knowledge of microbiologically induced taints that occur in a wide range of foodstuffs, including meats, poultry, fish, crustaceans, milk, dairy products, fruits, vegetables, cereals and cereal products. Examples have been chosen where the compounds responsible for the taint have been identified and sufficient data obtained to demonstrate the involvement of microorganisms. However, in some cases the full identity of the causative organism may not have been elucidated. The types of microorganisms covered by this review include bacteria, fungi, yeasts, actinomycetes and cyanobacteria. Although cyanobacteria do not in general infect foods, their presence in aqueous systems and water supplies can lead to off-flavours in aquatic organisms and processed foodstuffs. Several examples of each of these processes are discussed. Wherever possible, the likely biosynthetic pathway used by the microorganism to produce the offending compound in a foodstuff is indicated. 相似文献
16.
Polymers intended for food contact use have been analysed for organic residues which could be attributed to a range of substances employed as polymerization aids (e.g. initiators and catalysts). A wide range of polymers was extracted with solvents and the extracts analysed by gas chromatography-mass spectrometry (GC-MS). The overwhelming majority of substances identified were not derived from aids to polymerization but were oligomers, additives and adventitious contaminants. However, a small number of substances were identified as initiator residues. These included tetramethylsuccinonitrile (TMSN) which was observed in two polymers and it derived from recombination of two azobisisobutyronitrile (AIBN) initiator radicals. Methyl benzoate, benzoic acid, biphenyl and phenyl benzoate were detected in one poly(methyl methacrylate) sample and in two polyvinylchlorides and they are thought to be derived from benzoyl peroxide initiator. TMSN was subsequently targeted for analysis of poly-(methyl methacrylate) plastics using proton nuclear magnetic resonance spectrometry (1 相似文献
17.
Jesus Simal-Gandara Miguel Sarria-Vidal Rinus Rijk 《Food Additives & Contaminants》2000,17(9):815-819
Experiments were performed to characterize the kinetics of the permeation of different medium molecular weight model permeants: bisphenol A, warfarin and anthracene, from liquid paraffin, through a surrogate potential functional barrier (25 microns-thick orientated polypropylene--OPP) into the food simulants olive oil and 3% (w/v) acetic acid. The characterization of permeation kinetics generally observed the permeation models previously reported to explain the experimental permeation results obtained for a low molecular weight group of model permeants. In general, the model permeants exhibited behaviour consistent with their relative molecular weights with respect to (a) the time taken to attain steady-state permeation into the food simulant in which they were more soluble, (b) their subsequent steady-state permeation rates, and (c) their partition between liquid paraffin and the OPP membrane. 相似文献
18.
H. J. Van Den Top A. Boenke P. A. Burdaspal
J. Bustos
H. P. Van Egmond T. Legarda
A. Mesego A. Mouri o W. E. Paulsch C. Salgado 《Food Additives & Contaminants》2000,17(6):419-433
This paper describes the first part of a project undertaken to develop mussel reference materials for Paralytic Shellfish Poisoning (PSP) toxins. Two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin (STX) and decarbamoyl-saxitoxin (dc-STX) in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the second part of the project: the certification exercise. In the first study, 18 laboratories were asked to measure STX and dc-STX in rehydrated lyophilized mussel material and to identify as many other PSP toxins as possible with a method of their choice. In the second interlaboratory study, 15 laboratories were additionally asked to determine quantitatively STX and dc-STX in rehydrated lyophilized mussel and in a saxitoxin-enriched mussel material. The first study revealed that three out of four postcolumn derivatization methods and one pre-column derivatization method sufficed in principle to determine STX and dc-STX. Most participants (13 of 18) obtained acceptable calibration curves and recoveries. Saxitoxin was hardly detected in the rehydrated lyophilized mussels and results obtained for dc-STX yielded a CV of 58% at a mass fraction of 1.86 mg/kg. Most participants (14 out of 18) identified gonyautoxin-5 (GTX-5) in a hydrolysed extract provided. The first study led to provisional criteria for linearity, recovery and separation. The second study revealed that 6 out of 15 laboratories were able to meet these criteria. Results obtained for dc-STX yielded a CV of 19% at a mass fraction of 3.49mg/kg. Results obtained for STX in the saxitoxin-enriched material yielded a CV of 19% at a mass fraction of 0.34mg/kg. Saxitoxin could not be detected in the PSP-positive material. Hydrolysis was useful to confirm the identity of GTX5 and provided indicative information about C1 and C2 toxins in the PSP-positive material. The methods used in the second interlaboratory study showed sufficiently consistent analysis results to undertake a certification exercise to assign certified values for STX and dc-STX in lyophilized mussel. 相似文献
19.
The Ministry of Environmental Protection Issued "Feasible Technology Guidelines for Pollution Prevention and Control in Wood Pulping Process of the Paper Industry (Trial)" and Two Other Guiding Technical Documents 下载免费PDF全文
《造纸信息》2014,(8):80-80
On December 27t", 2013, the Ministry of Environmenta Protection announced that, in order to implement "The Environmental Protection Law of the People' s Republic of China", improve the working system in environmenta protection technologies, and promote technologica advancement in pollution prevention, the Ministry of Environmental Protection sponsored the formulation of three guiding technical documents including "Feasible Technology Guidelines for Pollution Prevention and Contro n Wood Pulping Process of the Paper Industry (Trial)" 相似文献
20.
1~(st) Intelli-Tissue~ EcoEc Tissue Machine Supplied by PMP Group Successfully Put into Operation in China 下载免费PDF全文
《造纸信息》2014,(8)
正On April 29th,2014,Intelli-Tissue EcoEc tissue machine supplied by PMP Group successfully put into operation at Hebei Xuesong Paper Co.,Ltd.,this is the first such kind of paper machine of PMP Group in China. 相似文献