辣椒红色素提取工艺研究

以邱北辣为原料,以辣椒红色素相对量为评价指标,考察了提取温度、提取时间、液料比以及提取次数对辣椒红色素提取的影响。在单因素实验的基础上,采用正交实验对辣椒红色素的提取工艺进行优选。结果表明,以乙酸乙酯为提取溶剂,提取温度80℃,提取时间95 m in,液料比(mL/g)为20∶1,提取2次时,提取的辣椒红色素色价可达105.6,得率为9.68%。     

陇东地区干红辣椒中辣椒红素的提取工艺研究

辣椒红素是一种重要的天然红色素,可从干红辣椒中提取得到。用浓度15％的氢氧化钠溶液除辣,采用不同有机溶剂对辣椒红素的提取工艺进行了比较研究。分别考察了丙酮、正己烷、乙酸乙酯以及乙酸乙酯与丙酮的混合溶剂对辣椒红素提取的影响,实验结果表明：正己烷为比较好的提取溶剂,在温度为80℃时提取4 h,可以从陇东地区辣椒中得到高产率、高色价、无异味的辣椒红素。     

三明产小辣椒红色素提取和脱除辣素工艺研究

以10%NaOH溶液,60℃下皂化4 h,除去辣椒粉中辣椒红色素和粗品中的杂质。有机溶剂浸提的较佳提取温度为70℃,提取时间为4 h,m(辣椒)∶m(溶剂)=1∶4,辣椒红色素色价最高可达144(乙醇+石油醚),提取产率为4.29%。在提取辣椒红色素的工艺中,皂化前处理对提高色价有很好的效果,且辣味明显减小。     

红辣椒中红色素的提取与性质研究

研究了红辣椒中红色素的提取及其理化性质。结果表明无水乙醇、5％NaOH及丙酮中易于提取,得到红色粉末状的辣椒红色素,该色素对热、糖类、氧化剂和还原剂具有较好的稳定性。     

辣椒红色素的研究进展

辣椒红色素被认为是一种高色价的天然类胡萝卜素食用色素,它不仅无毒副作用,还有益于身体健康。广泛应用于食品、医药、保健品、化妆品等工业中。本文综述了溶剂法、超声波辅助提取法、闪式提取法、超临界CO2流体萃取法等辣椒红色素的提取方法,并介绍了辣椒红色素的纯化方法、分析方法以及应用前景。     

辣椒红色素和辣椒碱的研究进展

综述了辣椒红色素和辣椒碱的性质、提取方法及用途。简要介绍了辣椒红色素和辣椒碱的应用前景。     

食用天然草莓红色素的性质,提取及应用研究

研究了草莓红色素的性质、不同种类提取剂的提取率及提取工艺。实验表明：草莓红色素用水、盐酸、醋酸、柠檬酸的水溶液均可提取，草莓红色素易溶于水，在ｐＨ９，温度２０℃￣１００℃，日照１０ｄ均很稳定。可用于食品、饮料。     

微波辅助法提取辣椒红色素的探讨

文章对辣椒红色素的提取进行了较为详尽的研究。结果表明,适宜选用乙醇作为提取剂,提取液的最大吸收波长为471 nm;佳工艺条件是提取温度为55℃;提取时间2.5 h;物料比(g/ml)为1∶6.5。对微波辅助提取辣椒红色素的工艺进行了研究,最佳工艺条件:即微波功率为大火(600 W),微波作用12 min。该工艺具有溶剂用量少,提取周期较短,提取率较高等特点。且验证实验表明,该工艺条件操作稳定,有较好的重复性。     

龙虾虾壳的综合利用（I）—虾壳红色素的提取及其性质研究

本文研究了从龙虾虾壳中提取红色素的工艺，以及红色素的性质和该色素对温度和时间的稳定性。     

辣椒红色素的提取工艺研究

本文以红辣椒为原料,考察了提取辣椒红色素的几个影响因素,确定了提取辣椒红色素的优化条件。实验结果表明,提取的最佳条件为:提取溶剂为石油醚,原料粒度为20~40目,液固比为9:1mL/g,提取时间4h。     

辣椒红色素晶体制备技术的研究

色价为１００的油状辣椒红色素１００ｇ,加入１００ｍｌｃ（ＮａＯＨ）＝３．７５ｍｏｌ／Ｌ的溶液,并添加１％（ｗ）维生素Ｅ作为水解保护剂,９０℃下反应１．１７ｈ,得到吸附色素的固体皂化物,用饱和食盐水洗至中性,离心除去水分,用丙酮（３×５００ｍｌ）萃取皂化物中所吸附的色素,蒸馏除去丙酮,然后用３０ｍｌ石油醚（沸点６０～９０℃）结晶,得到辣椒红色素的晶体８．１ｇ,色价为１０１３。     

辣椒红色素制备新工艺研究

辣椒红色素在食品添加剂、饮料、化妆品和医药行业中应用广泛,有着较大的市场需求。今用正己烷(60℃,液固比5:1,提取时间3.5 h,提取2次)从辣椒中提取得到辣椒红色素粗提物,再用液-液萃取法精制;重点考察了乙醇溶液的浓度、原料液和乙醇溶液比值、萃取次数等对萃取过程的影响,建立了一条从辣椒中提取辣椒红色素的工艺路线。萃取过程合适的工艺条件为:常温下,选用60%(V/V)乙醇水溶液作萃取剂,原料液和萃取剂的体积比值为4:1,萃取一次。在上述条件下,得到的辣椒红色素的色价和辣椒素含量分别为87.3,0.16%,达到GB10783-2008要求。     

Grafting and quaternization of 2‐(dimethylamino)ethyl methacrylate onto polyamide‐6 fabric pretreated with acetone

Grafting of polyamide (PA‐6) pretreated with acetone was done using 2‐(dimethylamino)ethyl methacrylate (DMAEM). It was found that the percentage graft yield of acetone‐pretreated PA fabric was higher than the untreated and there was a difference of 4% under the same conditions. The graft yield was studied as a function of the different variable conditions such as monomer concentration, reaction time, and temperature. The pretreated and grafted DMAEM‐PA fabric was then quaternized with different alkylating agents including ethyl iodide, benzyl chloride, and epichlorohydrin. The grafted and quaternized fabrics had a significant increase in dyeability. The quaternized fabric showed higher moisture regain compared to the ungrafted one and that could enhance the antistatic effect of such fibers. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 2318–2323, 2001     

Control of gel time and exotherm behaviour during cure of unsaturated polyester resins

The curing behaviour of an unsaturated polyester resin has been studied by gel time and pseudo‐adiabatic exotherm measurements. The gel time corresponded closely with the initial rise in exotherm temperature. Incorporation of tert‐butyl catechol inhibitor increased the gel time in a linear fashion and the exotherm was similarly delayed. An increase in the concentrations of initiator (either methyl ethyl ketone peroxide or acetyl acetone peroxide) or cobalt octoate accelerator decreased the gel time in a reciprocal fashion and increased the rate of polymerization. These results are fitted to a theoretical model for inhibition and initiation. © 2001 Society of Chemical Industry     

金银忍冬果实色素的提取及稳定性研究

以金银忍冬果实为原料,研究其色素的提取工艺及稳定性。结果表明：金银忍冬果实色素易溶于乙醇、丙酮、石油醚,是脂溶性色素。质量分数为95％的乙醇是最佳提取剂。酸、碱、光、热稳定性较好。60℃条件下色素的提取效果最佳。Na^＋、Al^3＋、Mn^2＋、Zn^2＋金属离子对色素的稳定性无影响,且有不同程度的护色作用。而Fe^3＋、Cu^2＋对色素的影响较大。氧化还原剂、食品添加剂对其稳定性影响较小。     

C.I.颜料红122在有机溶剂中的溶解行为研究

测试了C.I.颜料红122（PR122）在DMF、DMSO、乙酸乙酯、丙酮、乙醇、甲苯、正己烷和四氯乙烯等八种有机溶剂中的溶解行为,结果表明,PR122在DMF和DMSO中有可观的溶解度,它的最大吸收波长随溶剂极性的增大而增长,它在这两种溶剂中的摩尔吸光系数要比偶氮染料小1个数量级.PR122在乙酸乙酯、丙酮和乙醇中微溶,在甲苯、正己烷和四氯乙烯中几乎不溶.采用国家标准（GB/T5211.5-2008）方法测定该颜料在上述有机溶剂中的溶解度并不科学,原因在于该方法没有考虑到细小的颜料颗粒会穿过普通滤纸的孔径.在DMF中,PR122的溶解度标准曲线服从Y=136.5X＋ 0.156,该回归方程的相关系数为0.9835,标准方差为0.1155;在DMSO中PR122的溶解度曲线服从下列数学式：y=96.5X＋ 0.594,该方程的相关系数为0.9805,标准方差为0.0804.     

Participation of pepper seed in the stability of paprika carotenoids

The degradation of carotenoid pigments present in dried, milled pepper fruit in the absence and presence of different proportions of seed at 70°C in an oven was studied. The thermodegradation reaction rate was inversely proportional to the percentage of seed in the mixture in a first stage. Beyond that stage, the mixtures with lower proportions of seed lost pigmentation more slowly with increasing reaction time. In taking the experiment as a whole, the value of the reaction rate was inverted, and was higher the greater the amount of seed. The presence of higher seed levels involve the addition of unsaturated fatty acids (mainly linoleic) that are prone to oxidation. Finally, in a mixture representing a commercial paprika, the effect of the presence of some 40% of seed on the degradation of the red and yellow pigment fractions was determined.     

从葡萄穗轴废渣中提取白藜芦醇

白藜芦醇的提取主要以有限资源虎杖为原料。作者开发了以新的原料葡萄穗轴废渣提取白藜芦醇的工艺。经薄层层析法对提取液分离后,用紫外分光光度法测定吸光度,确定了白藜芦醇的含量。考察了不同提取剂(甲醇、乙醇、丙酮、乙酸乙酯)、不同乙醇体积比、温度、时间、物料比对白藜芦醇提取率的影响。通过单因素实验和正交实验确定了最佳提取条件:体积分数50%的乙醇为提取剂,提取温度70℃,m(葡萄穗轴)∶m(乙醇)=1∶13,提取时间4.0 h,白藜芦醇一次提取率达0.34%。     

Solubility measurement and thermodynamic properties of sulfamonomethoxine in pure solvents and sulfamonomethoxine hydrate in acetone + water binary solvent at different temperature

The experimental solubility of sulfamonomethoxine in six different pure solvents (methanol,ethanol,1-propanol,l-butanol,ethyl acetate and acetone) and sulfamonomethoxine hydrate in acetone + water mixture solvents were measured from 294.55 K to 362.15 K by a laser dynamic method under atmospheric pressure.Experimental results indicated that the solubility data of sulfamonomethoxine increased with temperature increasing in pure solvents and the solubility followed this order:acetone ＞methanol ＞ ethanol ＞ ethyl acetate ＞ 1-propanol ＞ 1-butanol,but solubility in ethyl acetate was not affected significantly by temperature.In acetone + water mixture solvent,the solubility of sulfa-monomethoxine hydrate increased with temperature and the acetone concentration.Thermodynamic equations were applied to correlate solubility data of sulfamonomethoxine and sulfamonomethoxine hydrate including the modified Apelblat equation,λh equation,Wilson equation,NRTL equation,Van't Hoff-Jouyban Acree equation and modified Apel-Jouyban-Acree equation.Furthermore,thermodynamic properties △Gd,△Hd and △Sd of sulfamonomethoxine and sulfamonomethoxine hydrate in dissolution process were obtained and discussed with the modified Van't Hoff equation and Gibbs equation.