沙棘黄色素稳定性的研究

研究了沙棘果实中黄色素的稳定性。结果表明 :p H值对色素色泽影响不明显 ,该色素适用于酸性或弱碱性的食品。氧化剂 ( H2 O2 )、还原剂 ( Na2 SO3 )、葡萄糖、金属离子 ( Na+ 、Zn2 + 、Ca2 + )对色素无不良影响 ,而 Cu2 + 、Fe3 + 对色素的色泽有一定影响。色素的热稳定性较好 ,其热降解遵循一级反应动力学规律。光对色素有明显的降解作用 ,在自然光照条件下 ,放置 2天色素就降解了 68.3% ,放置 8天降解 88.93%     

玉米黄色素稳定性的研究

从玉米淀粉下脚料——玉米渣皮中提取的玉米黄色素是一种完全、无毒的天然植物色素。本文研究了食品中常用的几种食品添加剂对玉米黄色素稳定性的影响,并对色素的耐氧化性、耐还原性、耐热性、耐光性等性质进行了探讨。旨在为玉米黄色素的开发、利用提供有用的信息。     

玉米黄色素的稳定性研究

主要研究了玉米黄色素的稳定性.该色素耐光性、耐热性较差,对氧化剂极不稳定,对Al3 、Fe3 等离子稳定性较差,而对酸、碱、还原剂、食品添加剂及Na 、K 等离子较稳定.     

南瓜黄色素的提取工艺优化及稳定性研究

用95%乙醇提取南瓜黄色素,并考察了光照、温度、pH值、金属离子及常用食品添加剂等对其稳定性的影响。结果表明:南瓜黄色素的最佳提取条件为:料液比1∶11g/mL,95%乙醇提取3.5h、pH6.0,提取温度60℃。南瓜黄色素溶液在强光和高温下不稳定,对pH值波动、大部分金属离子和食品添加剂溶液中表现稳定,但溶液中的Fe3+和十二烷基磺酸钠(SDS)对该色素有较大影响。     

南瓜黄色素提取工艺优化及稳定性评价

通过单因素实验法优化了南瓜黄色素的提取工艺条件,并对其及稳定性进行了评价,确定了南瓜黄色素提取的最佳工艺条件为:在搅拌条件下,以95%乙醇为提取剂,1∶15的料液比,温度为60℃,提取时间为3 h。色素稳定性试验表明:在常温下南瓜黄色素具有一定抗氧化性和抗还原性,对金属离子稳定,随时间分解缓慢,但高温和光照对色素有破坏作用。     

氧化还原剂及金属离子对栀子黄色素稳定性的影响研究

探讨了食品中常见氧化剂、还原剂及金属离子对栀子黄色素稳定性的影响.以栀子黄色素为材料,栀子黄色素色素损失率为表征指标,改变不同食品中常见氧化剂、还原剂及其浓度,改变金属离子种类,通过紫外可见分光光度计对处理后的栀子黄色素溶液进行全波长扫描,计算栀子黄色素色素损失率.试验所得数据通过Excel软件进行统计分析,使用LSD...     

栀子黄色素稳定性的研究简

对栀子黄色素稳定性进行了较为全面的研究。结果表明：栀子黄色素总体具有较好的稳定性。栀子黄色素热稳定性、耐酸碱性较好,但室外自然光、紫外光对栀予黄色素有一定的影响;金属离子（Fe3＋、Cu2＋、Al3＋）、H2O2、Na2SO3、柠檬酸对栀子黄色素有较大影响。     

沙棘果综合利用的研究

什么是沙棘的综合利用？从广义上讲沙棘的综合利用是指充分发挥沙棘 的经济效益、生态效益和社会效益。从狭义上讲，沙棘的综合利用是指充分挖掘沙棘的经济潜力，进行沙棘的无废料加工。用一组数字能很清楚地说明这个问题。以100吨沙棘果来计算，可生产原汁70．5吨，若按每吨1300元计算，为91650元；出果渣6．8吨；若按每吨600元计算，为4080元；出种子4吨，若按每吨6000元计算，为24000元；出果油634．5公斤，若按每公斤200元计算，为126900元；可提种子油352公斤，若按每公斤500元计算，是176000元；6．8吨果渣可出油492公斤，若按每公斤200元计算，是98400元。由此看来，如果只生产沙棘汁，其产值不过9万元，如果把种子，果渣都变为商品，再把沙棘油全部提取出来，总产值可达52万元，增值4．7倍，若再真正实现了沙棘的无废料加工，其经济效益就更为可观。     

不同温度、pH、光照条件对栀子黄色素稳定性研究

目的 探讨研究不同pH、温度和光照条件对栀子黄色素稳定性的影响.方法以栀子黄色素为材料,色素损失率为表征指标,改变栀子黄色素所处pH、温度和光照条件,通过紫外可见分光光度计对处理后的栀子黄色素溶液进行全波长扫描,计算栀子黄色素色素损失率.试验所得数据通过Excel软件进行统计分析,使用LSD和SPPSS19.0对时间结...     

姜黄色素的提取和稳定性的研究

以姜黄为原料 ,用食用乙醇提取黄色素并对该色素的稳定性进行了研究 ,结果表明 :可得到 2 4%的黄色素浆 ,该色素对光和热都有一定的稳定性     

辣椒红色素的提取工艺及稳定性研究

红辣椒中含有纯天然辣椒红色素，研究了辣椒红色素的几种提取方法。用有机溶剂从辣椒中提取红色素，同时对不同温度、不同时间下的色素提取率进行测试，以确定最佳提取条件；研究发现，乙酸乙酯法可以有效地去除辣椒中的辣味，使产品应用于更广泛的领域。本文还研究了辣椒红色素对pH值、光照、温度、金属离子的稳定性。     

Drying of Seabuckthorn (Hippophae rhamnoides L.) Berry: Impact of Dehydration Methods on Kinetics and Quality

Convective hot air drying and freeze drying were investigated as potential dehydration processes to obtain powders of seabuckthorn fruit pulp. Halved seabuckthorn fruits were placed in a hot air dryer and dried at 1 m/s and at 50 or 60°C or freeze dried at less than 30 mTorr and at 20 or 50°C shelf plate temperature. An initial characterization of the seabuckthorn pulp (moisture, pH, soluble solid content, vitamins C and E, total phenolics, and carotenoids) was performed. Water loss, total phenolic compounds, total carotenoids, and vitamin C were determined at different processing times. Vitamin E was determined before and at the end of drying.

Freeze-drying kinetics were faster than air drying, probably due to lower moisture diffusion in the compact, sugary, and oily structure of the air-dried tissue. The temperature had an important impact on hot air–drying and freeze-drying kinetics. Drying method and processing times affected the remaining phenolic, carotenoid, and vitamin contents of seabuckthorn berries. Freeze drying was revealed as a superior method to obtain seabuckthorn powders because of the lower residual moisture content, the ease of grinding, as well as the better nutritional retention.     

Preparation and thermal reflectivity of nickel antimony titanium yellow rutile coated hollow glass microspheres composite pigment

In order to reduce the urban heat island effect, nonwhite lightweight pigments with high near infrared reflectance were studied. Nickel Antimony Titanium Yellow Rutile pigments (TiNiY) coated hollow glass microspheres (HGM@TiNiY) with core-shell structure were prepared by a novel mixing slurry-sintering method. The Reflective property of HGM@TiNiY/SR composite coating prepared by mixing HGM@TiNiY with silicone resin (SR) was investigated by an UV–Vis–NIR spectrum analyzer. The results showed that the size distribution of TiNiY particles was from 150 to 450?nm with an average size of 230?nm, and the binding mode of TiNiY particles with HGM and the formation mechanism of TiNiY Shell were discussed. The UV–Vis–NIR reflectance of HGM@TiNiY/SR coating was not only better than that of others filled with HGM powders or TiNiY powders alone but also higher than that of the coating filled with the mixture of HGM and TiNiY powders at the same volume ratio. A possible mechanism of HGM@TiNiY/SR coating on thermal reflection was discussed. This clearly indicates that the pigment of HGM@TiNiY with core-shell structure could be applied as a good colour cool pigment.     

栀子黄色素提取工艺的研究进展

栀子黄色素是从栀子果实中提取得到的天然色素,广泛应用于食品、医药和化妆品行业。目前栀子黄色素的生产工艺复杂,产品的得率和色价较低,制取高色价高纯度的栀子黄色索是近年来研究的热点。本文按照提取精制方法的不同,综述了近10年来国内外对栀子黄色素的研究成果,着重探讨了栀子黄色素的性质和分离纯化的工艺条件,并展望了栀子黄色素的...     

粒度对高温色料色度的影响

运用离子呈色理论、晶体场理论,较好地解释了颜色釉的呈色机理,并根据色料的晶体结构及在釉中的存在状态,借助粒度分析仪、色度仪研究了色料的粒度大小对色度的影响规律.     

乌饭树果红色素的研究——Ⅳ乌饭树果红色素的性能研究

研究了乌饭树果红色素的理化性能,进行了乌饭树果红色素的毒性试验和应用试验,为该色素的制备、贮藏和应用提供了科学依据。     

枸橼果实化学成分研究

研究枸橼Citrusmedica L.果实的化学成分,采用硅胶柱色谱、Sephadex LH-20、ODS等方法分离纯化化合物,应用波谱方法鉴定其结构。从枸橼果实中分离得到13个化合物,分别为:柠檬内酯(Ⅰ)、东莨菪亭(Ⅱ)、β-谷甾醇(Ⅲ)、奥巴叩酮(Ⅳ)、诺米林(Ⅴ)、柠檬苦素(Ⅵ)、异奥巴叩酸(Ⅶ)、橙皮素(Ⅷ)、胡萝卜苷(Ⅸ)、1-O-(β-D-葡萄糖基)-(2S,3S,4E,8E)-2-[(2′R)-2′-羟基十六酰氨基]-4(E),8(E)-十八二烯-1,3-二醇(Ⅹ)、柚皮素-7-O-β-D-葡萄糖苷(Ⅺ)、柚皮苷(Ⅻ)、橙皮苷(■)。     

Influence of organic pigment particles on millbase flow of nitro-cellulose/alcohol-rich liquid inks

Millbase flow of nitro-cellulose/alcohol-based inks deteriorates above a critical pigment weight fraction in the ink which differs from pigment to pigment. Below this critical concentration the inks are flocculation-resistant by virtue of a stabilizing adsorbed layer of NC resin on the pigment particle surfaces. The pigment particles are large aggregates of crystals, from which additives such as abietyl resin have been shown to dissolve off into the ink medium. The aggregates are associated with liquid medium immobilized within the shear boundary near the pigment/medium interface (includes adsorbed layers and liquid within pores). This results in the effective pigment volume fraction in the ink being higher than that calculated from the weight fraction. When considered in terms of the effective volume fraction, most of the pigments have the same critical concentration of about 0.2–0.25. This indicates that deterioration in flow at higher concentrations is due in the first instance to crowding of particles, rather than to the failure of the mechanism of flocculation resistance per se. The robustness of the flocculation resistance is indicated by a low rate of increase of the strength of the structure with an increase in the effective volume fraction above the critical concentration. Robustness is important in maintaining manageable flow at high concentrations. Increasing the proportion of ethyl acetate in the solvent blend can adversely affect the millbase rheology of dispersions of some pigments in NC ink media due to induced flocculation and structure formation. The improved solvency of the blend for NC resin has been shown to reduce the amount of NC resin adsorbed on the particles of an ester-sensitive pigment. Other pigments give inks with rheology insensitive to ester content. This is attributed to more specific interaction of the NC resin with the pigment particle surfaces. The effect of temperature on flocculation resistance is consistent with these views.     

Modeling the effect of pigment morphology on the dynamic compression of coating layers using DEM

In the present paper, discrete element method (DEM) was employed to investigate the effect of pigment morphology on packing dynamics and compressive behavior of paper coating layers in calendering process. Spherical, platy, and needle-like particles, representing GCC, delaminated clay, and aragonite PCC pigments, were considered in this study. For each particle shape, the compression of coating structures formed by mono-sized and poly-dispersed pigments were modeled. Stress–strain behavior of the coating layers and in-plane and out-of-plane movements of the pigment particles during the compression were computed under the same maximum compressive stress. Simulation results revealed that the in-plane movements of the pigment particles during compression in the calender nip were small in magnitude (<0.35 μm). These findings help to better understand the smoothening phenomena of coating structures during the calendering process.