红龙果食用红色素的提取及理化性质分析(Ⅰ)

从红龙果中提取了食用红色素H和副产物,研究了该食用红色素的理化性质,包括红色素的溶解性和可见吸收光谱特征,溶液pH值、加热、光等对色素稳定性的影响;还进行了色素和副产物的IR分析,红龙果挥发油成分的GC-MS分析;研究表明该色素为水溶性色素,其吸收光谱因pH而异,在pH=4～7、低温、避光条件下稳定性好;副产物为肌醇.     

石楠叶红、绿色素成分比较及抗氧化活性研究

采用多溶剂筛选最佳提取溶剂;以紫外分光光度法、高效液相色谱法、红外光谱法系统比较石楠红、绿色素成分的差别;同时考察红、绿色素对DPPH·清除能力、还原Fe3+能力和清除·OH自由基能力。结果以90%乙醇和乙酸乙酯-乙醇(1∶1)提取红色素、绿色素效果较好;通过显色反应、紫外光谱、红外光谱鉴别和高效液相色谱分析,基本确定红色素成分为黄酮类,绿色素成分为叶绿素类。抗氧化实验结果表明,在达到最大浓度0.34mg·m L-1时,石楠叶红、绿色素和维生素C对DPPH·清除率依次为79.6%,70.8%,66.9%,红、绿色素对·OH自由基的清除率依次为67.1%,51.2%,且红色素还原Fe3+能力较强。     

紫外可见分光光度法测定放线菌BOS-011产红色素的稳定性

自长白山土壤中纯化得到一株具有产红色素功能的放线菌BOS–011,为明确此红色素的应用和储存条件,采用紫外可见分光光度法对其稳定性进行了研究。色素样品经发酵、分离、研磨、溶解,在527 nm波长下测定样品溶液的吸光度。该色素溶解于大部分有机溶剂,微溶于水和正丁醇;耐热性较差;在酸性介质中稳定性优于碱性介质;光照、氧气、常用防腐剂对色素的稳定性影响较小;蔗糖、Na+对色素有增色和保护作用;金属离子对色素的稳定性略有影响。该方法测定结果表明放线菌BOS–011所产红色素具有较好的着色性,可作为着色剂应用于生产中。     

果汁中天然色素紫胶红的UPLC/TUV定量检测及UPLC - MS/MS结构确证

建立了天然色素紫胶红各组分的UPLC/TUV定量检测及UPLC - MS/MS结构确证方法,并将所建立的分析方法应用于果汁中紫胶红色素的定性定量检测.通过Oasis(R) HLB小柱固相萃取技术净化、提取果汁饮料样品中的紫胶红色素.使用Waters Acquity UPLC BEH Shield RP C18(1.7 ...     

LC-ESI/MS分析食品中微量苏丹红Ⅰ~Ⅳ

建立了准确可靠的用LC-ESI/MS分析食品中4种苏丹红色素的方法。样品中的苏丹红用乙腈提取,不需纯化。色谱柱为AgilentC18(15cm×2.1mm,3μm),流动相为乙腈-0.5%乙酸溶液(体积比72∶28)。采用正离子电离方式,每种化合物选择3个碎片离子为定性离子以获得高选择性,选取每个化合物丰度最高的碎片为定量离子以获得高灵敏度。4种苏丹红色素的检出限(LOD)和定量下限(LOQ)均为ng/g水平。标准加入量为0.2μg/g水平时的回收率为86%~98%,且重复性良好。本方法仪器分析时间仅需8min,适合于大量样品的日常快速分析。     

枸杞子中红色素的提取及稳定性

枸杞子中红色素的提取及稳定性伍明，王杰，闪春霞，任仲皎，宋锡瑾，詹国庆（中南民族学院化学系武汉４３００７４）关键词枸杞，色素，液泛提取法枸杞子为茄科枸杞属植物的果实，具有补肾养肝，润肺明目以及调节机体免疫力，抑制肿瘤生长和细胞突变，延缓衰老及抗脂肪肝...     

天然红色素的提取研究进展

作为天然色素中的一大类,天然红色素在人们的日常生活中日益发挥着重要的作用。国内对天然红色素的提取研究起步较晚,但发展迅速。文章重点介绍了辣椒红色素、番茄红素、桑椹红色素等几种重要天然红色素的性质和提取方法,并比较了有机溶剂法、超临界CO2流体萃取法等提取方法的特点,同时对其效果和应用作了相应的展望。     

反相高效液相色谱法测定食品中胭脂虫红色素

胭脂虫红色素是一种蒽醌类天然色素,主要成分为胭脂红酸,理化性质比较稳定,胭脂红酸和氢氧化铝、明矾等铝盐反应可形成含水螯合物,是食品、化妆品、医药及纺织品的优良着色剂,也是唯一一种经美国食品药物管理局(FDA)允许可用于食品、药品和化妆品的天然色素。胭脂红酸在生物高新技术及生物标本制作上也有重要用途,且被视为最安全的天然色素之一。我国国家标准GB 2760—2007《食品添加剂使用卫生标准》已将胭脂虫红色素作为允许使用的食品添加剂并列入国家标准,同时     

紫薯中花青素的超声波提取工艺

花青素是允许使用的一类天然红色素、是以黄酮核为基础的糖甙,紫薯中的花青素具有较强耐热性和耐光性,稳定性好,抗突变性较强、抗氧化能力和活性氧消除能力很强,对动物的肝功能障碍具有缓解作用。从紫薯中提取花青素色素解决了以往工业生产葡萄、草莓原料生产季节性强、造价高等不足。目前,主要是以酸化乙醇在静置条件下加热浸提紫薯中的花青素,温度较高,时间较长。本文对超声波提取与冻结。融解法相结合,得出最佳的提取条件。     

D-101树脂对胭脂虫红色素吸附特性的研究

绘制了胭脂虫红色素的标准曲线,从9种不同性质的大孔吸附树脂中筛选出D-101树脂用于分离胭脂虫红色素,研究了D-101树脂对胭脂虫红色素吸附动力学曲线和不同温度下的吸附等温线。实验结果表明:胭脂虫红色素溶液浓度与吸光度之间显示良好的线性关系;D-101树脂对胭脂虫红色素的吸附速率快,120min达到平衡,吸附量为143.17mg/g树脂,吸附动力学曲线符合二级吸附动力学模型;D-101树脂对胭脂虫红色素的吸附等温线符合Freundlich方程,低温有利于吸附;通过热力学计算得到H、G、S均小于0,说明吸附是放热过程且能自发进行,吸附后体系趋向有序。研究结果可为胭脂虫红色素的分离提供有益的参考。     

品红甲亚胺染料影像光稳定性的研究——抗氧化剂和单重态氧的反应能力及其对染料影像光褪色的影响

本文研究了苯酚类(A),双酚类(B),对苯二酚类(C),色满类(D)和双螺色满类(E)抗氧化剂的性能。通过循环伏安法测定了它们的氧化电位;用类似Stern-Volmer关系图求得各抗氧化剂和单重态氧的反应速率常数。抗氧化剂的氧化电位越小,和单重态氧的反应速率常数越大,对品红甲亚胺染料影像的防褪色效果越好,进一步证实了染料褪色的光氧化反应机理。在这些抗氧化剂中,它们的防褪色效果依次为D>E>C>B>A。     

Analytical Utility of the Unique Colour Reaction Between Uranyl Ions and Alizarin Fluorine Blue

Abstract

The uranyl-alizarin fluorine blue chelate complex shows an absorption peak at 560 nm, 30 nm higher than that of any other single metal complex of the reagent. The complex shows, at pH 4.5, a conditional stability constant of 2.3 × 10⁶ litres mole^?1 and molar absorptivity of 4100 litres mole^?1 cm^?1. Study of the feasibility of using this reaction for the photometric determination of Uo₂ ⁺² in both one and two liquid phase systems reveals serious interference from other metal ions.     

Durability and cleaning of matt surface ceramic colour standards

Matt surfaced versions of the Ceramic Colour Standards are produced by CERAM Research by means of an abrasion technique applied to the normally gloss surface. These are available as an alternative to the existing matt standards made from opal glass, pressed powder and ‘plastic'. The existing standards have good matt surfaces but generally have a comparatively short life due to the delicate nature of the surface. This causes problems in maintaining continuity of measurement. The Ceram Research matts also have a good matt surface which, being ceramic should be durable. This paper reports the results of a series of measurements made on selected standards, which show that the standards are durable. In addition it was found that it was possible to clean the standards, returning them close to their original colour values.     

Der Chromat‐Nosean Na8[Al6Si6O24](CrO4) — ein zeolithisches Gelbpigment?

A Chromate(VI) Oxide Ceramics Na₈[Al₆Si₆O₂₄](CrO₄) with Zeolitic Nosean Structure and Pigment Properties The cages of the zeolitic sodalite lattice can be occupied by half by the tetrahedral CrO₄^2— group, yielding a thermally stable, intense lemon‐yellow pigment, in which the colour centres are shielded completely from the atmosphere. The analyses yielded compositions Na₈[Al_6+2δSi_6—2δO₂₄](CrO₄)_1—δ with a small surplus of Al³⁺ and a CrO₄^2— deficiency (δ ≅ 0.15).     

新试剂苯并噻唑重氮氨基偶氮苯与镉的显色反应研究及其应用

在Ｔｒｉｔｏｎ Ｘ－１００存在下，ｐＨ９．０－１０．０时，新试剂苯并噻唑重氮氨基偶氮苯与镉形成３：１的橙红色络合物，最大吸收波长位于５３０ｎｍ，表观摩尔吸光系数为１．９１×１０＾－５Ｌ．ｍｏｌ＾－１；ｃｍ＾－１，镉量在０－１２μｇ／２５ｍＬ范围内遵守比尔定律。在混合掩蔽剂存在下，显色反应具有良好的选择性，直接应用于工业废水中微量镉的测定，获得了满意的结果。     

A comparative study of the behaviour of Crystal Violet,alizarin-9-imine and quinalizarin-9-imine as indicators in anhydrous acetic acid medium

A comparative study has been made of the behaviour of alzarin-9-imine, quinalizarin-9-imine and the widely used Crystal Violet as indicators in anhydrous acetic acid medium. The protonation constants of quinalizarin-9-imine, and the properties required by a base if it is to be titratable in acetic acid medium with use of the indicators studied, the chromaticity co-ordinates, optimal concentration for titration and the quality of the colour changes have been determined. The results obtained show Crystal Violet and alizarin-9-imine to be very good indicators in acetic acid medium but alizarin-9-imine gives better end-point location. Quinalizarin-9-imine is also a good indicator but exhibits poorer colour change quality than the other two.     

The Influence of Temperature Differences in Smoking Chamber and Furnace and Smoking Time on the Quality of Medium-Ground Sausages

The aim of the work was to determine the impact of two variants (A and B) of smoking (differing in temperature values, furnace, top and bottom of the smoking chamber and the length of smoking time) in the sausage technological process carried out in a traditional smoking chamber with an indirect furnace. The research material consisted of medium-ground sausages: Country, Home and Bieszczady sausages. The research showed that, as the temperature in the smoking chamber and the smoking time changed, the following texture parameters decreased: cycle hardness 1 and 2, springiness, gumminess and chewiness. In addition, there were shown statistically significant differences (p < 0.05) in the chemical composition of Country sausage between the applied smoking variants. It was also found that the temperature of the furnace, upper and lower smoking chamber and the length of smoking time did not have a statistically significant influence on the share of red (a*) and yellow (b*) in the analysed sausages.     

高效液相色谱法测定饮料中的食用色素

利用吸附-解吸过程提取饮料中的食用色素,采用YWG—C1810μm不锈钢柱,以甲醇-0．02mol／L乙酸铵溶液作流动相,紫外检测波长为254nm,利用梯度洗脱程序分离食用色素,采用高效液相色谱法测定。样品溶液的最佳pH值为6。柠檬黄、苋菜红、胭脂红、日落黄、亮蓝的检出限分剐为0．14、0．20、0．29、0．25、1.04μg／mL。回收率为90．0％～96．7％,测定结果的相对标准偏差为1．37％-2．98％。     

高效液相色谱法同时测定冰淇淋中的10种合成色素

建立了一种同时测定冰淇淋中靛蓝、新红、亮蓝、柠檬黄、日落黄、苋菜红、胭脂红、偶氮玉红、诱惑红、赤藓红10种合成色素的高效液相色谱分析方法.对提取试剂、流动相条件、最大吸收波长进行了研究,确定了最佳提取方法及色谱条件.待测样品经甲醇-水提取,加水稀释后上机分析,采用Symmetry C18柱(25 cm×4.6 mm×5...     

添加剂和注塑工艺对AES颜色稳定性的影响

通过透射电子显微镜(TEM)研究发现,未染色丙烯腈―三元乙丙橡胶―苯乙烯共聚物(AES树脂)的宏观颜色变化与其橡胶形态密切相关,而橡胶形态受配方中添加剂组分的影响很大。另外,注塑工艺也会影响AES注塑样品的宏观颜色变化。通过在体系中加入润滑剂硬脂酸钙或芥酸酰胺,可以有效地控制AES注塑样品的颜色变化。