期刊文献+
共找到1,537篇文章
< 1 2 77 >
每页显示 20 50 100
Preliminary Identification of Red Pigment and Positive Correlation between the Contents of Red Pigment and Total Saponins of Panax notoginseng Fruits 被引量:1
1
作者 赵昶灵 陈中坚 +3 位作者 陈文龙 支伟特 魏富刚 宋德功 《Agricultural Science & Technology》 CAS 2012年第9期1891-1895,共5页
[Objective] This study aimed to identify red pigment of Panax notoginseng fruits and explore the correlation between pigment content and total saponins of the fruits. [Method] The red pigment of Panax notoginseng frui... [Objective] This study aimed to identify red pigment of Panax notoginseng fruits and explore the correlation between pigment content and total saponins of the fruits. [Method] The red pigment of Panax notoginseng fruits was preliminarily identi- fied with specific color reactions and UV-vis spectra, and the contents of the pigment and total saponins were determined via spectrophotometry. [Result] The red hues of the fruits were contributed by anthocyanins and/or the anthocyanidins. The contents of anthocyanins and total saponins of the fruits both decreased along with thinning of the red hues. The content difference of the anthocyanins in fruits with different red hues reached extremely significant level, but that of total saponins just reached significant level. [Conclusion] The red pigment of P. notoginseng fruits is anthocyanins which are of extremely significant positive correlation with total saponins in contents. 展开更多
关键词 Panax notoginseng fruits red pigment Anthocyanins Total saponins Content correlation
下载PDF
Purification of specularite by centrifugation instead of flotation to produce iron oxide red pigment 被引量:1
2
作者 Xi Zhang Shun-wei Zhu +3 位作者 Yu-jiang Li Yong-li Li Qiang Guo Tao Qi 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2021年第1期56-65,共10页
This study used specularite, a high-gradient magnetic separation concentrate, as a raw material in reverse flotation.An iron concentrate with a grade of 65.1 wt% and a recovery rate of 75.31% were obtained.A centrifug... This study used specularite, a high-gradient magnetic separation concentrate, as a raw material in reverse flotation.An iron concentrate with a grade of 65.1 wt% and a recovery rate of 75.31% were obtained.A centrifugal concentrator served as the deep purification equipment for the preparation of iron oxide red pigments, and its optimal rotating drum speed, feed concentration, and other conditions were determined.Under optimal conditions, a high-purity iron oxide concentrate with a grade of 69.38 wt% and a recovery rate of 80.89% were obtained and used as a raw material for preparing iron oxide red pigment.Calcining with sulfuric acid produced iron red pigments with different hues.Simultaneously, middlings with a grade of 60.20 wt% and a recovery rate of 17.51% were obtained and could be used in blast furnace ironmaking.High-value utilization of specularite beneficiation products was thus achieved. 展开更多
关键词 SPECULARITE RECONCENTRATION centrifugal concentrator iron oxide red pigment
下载PDF
Research and Development of Cadmium Sulphoselenide Red Pigment 被引量:3
3
作者 吴建锋 LI Kun +3 位作者 XU Xiaohong ZHANG Yaxiang XU Xiaoyang LAO Xinbin 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第6期1247-1254,共8页
Cadmium sulphoselenide was synthesized continuous substitution solid solution and the only known pigment to yield bright red color on ceramic decoration. Encapsulated cadmium sulphoselenide pigments could yield abunda... Cadmium sulphoselenide was synthesized continuous substitution solid solution and the only known pigment to yield bright red color on ceramic decoration. Encapsulated cadmium sulphoselenide pigments could yield abundant hues from yellow to red with high opacity at high temperature. The color generation has a linear function relation with the substitution rate. The encapsulation formation process of zirconium silicate encapsulated cadmium sulphoselenide was shown. Insuffi cient encapsulation effi ciency and potential hazard to human and environment had limited the industrial application of cadmium sulphoselenide red pigment. Ink-jet printing decoration required fi ne size cadmium sulphoselenide red pigment on ceramic decoration. The review mainly focused on the synthesis techniques and industrial application of cadmium sulphoselenide red pigment. 展开更多
关键词 cadmium sulphoselenide red pigment encapsulation effi ciency potential hazard industrial application
下载PDF
Preparation of SiO_2 coated Ce_2S_3 red pigment with improved thermal stability 被引量:9
4
作者 陈观宏 朱振峰 +2 位作者 刘辉 武英峰 朱春奎 《Journal of Rare Earths》 SCIE EI CAS CSCD 2013年第9期891-896,共6页
SiO2 coated Ce2S3 red pigment was prepared in ethanol/H2O system via sol-gel method and TEOS were used as silica sources. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy... SiO2 coated Ce2S3 red pigment was prepared in ethanol/H2O system via sol-gel method and TEOS were used as silica sources. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX), UV-visible spectro-photometer and automatic colorimeter were used to investigate the properties of the samples. The results showed that the compact SiO2 film formed on the surface of Ce2S3 pigment at a cerium silicon molar ratio of 2. The thermal stability temperature of Ce2S3 pigment was improved to 450 oC after SiO2 coating. In addition, the color of Ce2S3 pigment was not affected significantly through coating colorless and transparent SiO2 and it could be used as safe red pigment in higher temperature fields. 展开更多
关键词 Ce2S3 red pigment SiO2 coating cerium silicon molar ratio thermal stability rare earths
原文传递
Novel environmentally friendly inorganic red pigments based on calcium bismuth oxides 被引量:2
5
作者 WENDUSU Tetsuro YOSHIDA +1 位作者 Toshiyuki MASUI Nobuhito IMANAKA 《Journal of Advanced Ceramics》 SCIE CAS CSCD 2015年第1期39-45,共7页
Novel environmentally friendly inorganic red pigments based on calcium bismuth oxide Ca3(Bi1-xREx)8O15(0≤x≤0.09;RE=Sc^(3+),Er^(3+),Y^(3+),Ho^(3+)and Dy^(3+)),were successfully synthesized and the color properties we... Novel environmentally friendly inorganic red pigments based on calcium bismuth oxide Ca3(Bi1-xREx)8O15(0≤x≤0.09;RE=Sc^(3+),Er^(3+),Y^(3+),Ho^(3+)and Dy^(3+)),were successfully synthesized and the color properties were characterized.The color of these pigments depended on the composition and the synthesis condition,and the most vivid red color was obtained for the Ca3(Bi0.93Y0.07)8O15 sample calcined thrice at 800℃for 2 h.The L*and a*values corresponding to brightness and red chromaticity for this pigment were 45.6 and+30.6,respectively,which were greater than those of a commercially available Fe2O3 pigment(L^(*)=38.4,a^(*)=+29.5).Since the present pigment is composed of nontoxic and safe elements,it should be an attractive alternative to the conventional Fe2O3 pigment. 展开更多
关键词 calcium bismuth oxide environmentally friendly red pigment solid solution cation complexation method
原文传递
Effect of Sr^2+ and Dy^3+ co-doping on coloration and temperature stabilization of a γ-Ce2S3 red pigment 被引量:2
6
作者 Yueming Li Qi Liu +3 位作者 Fusheng Song Zhumei Wang Zongyang Shen Yan Hong 《Journal of Rare Earths》 SCIE EI CAS CSCD 2020年第2期213-218,共6页
In this paper,a Sr^2+and Dy^3+co-doped γ-Ce2S3 red pigment was synthesized via a combination of coprecipitation and sulfurization processes.Mixed oxide was prepared by presintering the coprecipitates,(Ce,Sr,Dy)CO3,fo... In this paper,a Sr^2+and Dy^3+co-doped γ-Ce2S3 red pigment was synthesized via a combination of coprecipitation and sulfurization processes.Mixed oxide was prepared by presintering the coprecipitates,(Ce,Sr,Dy)CO3,followed by high-temperature sulfurization under a CS2 atmosphere.The effects of the sulfurization temperature,time,and doped proportion on the phase composition,color performance and temperature stability of γ-Ce2S3 were systematically studied.The results show that a stable γ-Ce2S3 red pigment can be obtained through Sr^2+and Dy^3+co-doping at 730℃ for 200 min.The diffraction peaks of all the samples shift to higher 2θ values with increasing doping proportion,indicating that part of the Dy^3+species enter the lattice and form a solid solution.The band gap of the samples remains practically constant at 2.01-2.04 eV,which causes their red color.The best red-color quality(L*=37.13,a*=34.77,b*=29.44) is achieved when the pigment has a Dy^3+/Ce^3+molar ratio of 0.15,and the material maintains its excellent red color(L*=31.49 a*=30.94 b*=25.33) after being heated at 410℃ for 30 min. 展开更多
关键词 γ-Ce2S3 red pigment CO-PRECIPITATION Sr^2+ Dy^3+ CO-DOPED Rare earths
原文传递
Determination and thermal stability experiments of red pigment from large-scale silver deposit hosted in the Sinian strata in South China and their significance 被引量:1
7
作者 卢家烂 庄汉平 《Chinese Science Bulletin》 SCIE EI CAS 1995年第16期1347-1350,共4页
Over the past years a kind of red organic pigment was found in various strata in Chi-na. Recently, the authors have discovered the similar red pigment in a large-scale sil-ver deposit hosted in the Sinian black shale,... Over the past years a kind of red organic pigment was found in various strata in Chi-na. Recently, the authors have discovered the similar red pigment in a large-scale sil-ver deposit hosted in the Sinian black shale, and confirmed that the pigment is an 展开更多
关键词 silver DEPOSIT red pigment thermal stability.
原文传递
Preparation of Cr-Doped YAlO3 Red Ceramic Pigment and the Coloration Mechanism 被引量:1
8
作者 池至铣 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2017年第9期1439-1446,共8页
The red ceramic pigment is widely used in industrial production, but the pigments with pure color and bright red performance are rare. Therefore, it is important to study and develop new red ceramic pigment with perfe... The red ceramic pigment is widely used in industrial production, but the pigments with pure color and bright red performance are rare. Therefore, it is important to study and develop new red ceramic pigment with perfect color performance. This paper reports the preparation of Cr-doped YAlO_3 red ceramic pigment rendering by sol-gel method with high temperature resistance, good color and proposed color mechanism. The prepared samples were characterized by XRD, SEM, EDS and UV-vis, and the effects of Cr on the crystal structure, color rendering properties and color mechanism were discussed. The results showed that the optimum concentration of coloring agent(Cr) in Cr:YAlO_3 red ceramic pigment was 3 at.%. The main color mechanism was also discussed. Compared with the solid phase sintering and precipitation methods for the synthesis of red ceramic pigment, the sol-gel method possessed obvious advantages, such as perfect mixing of the raw materials, uniform dispersion of doping ions and the pure color. 展开更多
关键词 red ceramic pigment Cr:YAlO3 sol-gel method color mechanism
下载PDF
High-Efficiency Synthesis and Properties of Latent Pigment Red 272DPP-BOC by Microwave Irradiation
9
作者 Tomoji Ohishi Yu Kimura +2 位作者 Kiyohiko Nakajima Masayuki Watanabe Noboru Aoyagi 《Materials Sciences and Applications》 2020年第3期195-203,共9页
A high-efficiency synthesis method for a latent pigment of red pigment diketo-pyrrolo-pyrrole (Pig. Red 272:272DPP), which is important as a functional organic pigment, was investigated, and the investigation results ... A high-efficiency synthesis method for a latent pigment of red pigment diketo-pyrrolo-pyrrole (Pig. Red 272:272DPP), which is important as a functional organic pigment, was investigated, and the investigation results revealed that irradiation of microwaves (MWs) for several seconds to 272 DPP in NMP (N-methyl-2-pyrrolidone) solvent yielded DPP latent pigment (272DPP-BOC) at a high yield of 86.2%. Two kinds of latent-pigment crystals, namely, red and yellow, were obtained by recrystallization, and it was found that the fluorescence-emission properties of the two kinds differ significantly. Single-crystal X-ray structural analysis showed that the difference in the fluorescence-emission properties of the two types is derived from the difference in their crystal structures. 展开更多
关键词 LATENT pigment Diketopyrrolopyrrol pigment red 272 High Efficiency SYNTHESIS Microwave Irradiation SINGLE-CRYSTAL X-Ray Analysis
下载PDF
Isolation of a Prodigiosin-producing Strain and Analysis of It's Pigments 被引量:1
10
作者 段学辉 傅奇 +2 位作者 魏斌 郭炳其 贾奎艳 《Agricultural Science & Technology》 CAS 2010年第11期25-27,72,共4页
[Objective] The aim was to isolate a prodigiosin producing strain and study its pigment fractions.[Method] Red pigment-producing bacteria was identified by physiological and biochemical characteristics after isolation... [Objective] The aim was to isolate a prodigiosin producing strain and study its pigment fractions.[Method] Red pigment-producing bacteria was identified by physiological and biochemical characteristics after isolation in plate.By using column chromatography and thin-layer chromatography,pigment fractions were separated and purified from the extractives of the strain after fermentation in flask,and then pigment fractions were analyzed via UV-Vis and LC/MS.[Result] A red pigment-producing Serratia marcescens strain NS-17 sampled from soil of Nanchang was isolated and identified.2 pigment fractions showing similar UV-Vis and LC/MS characters were separated and purified,the characters of fraction 1 were identical to those of prodigiosin,while fraction 2 showed a special UV-Vis absorption spectrum that had not been reported.[Conclusion] A prodigiosin-producing Serratia marcescens strain NS-17 and its 2 pigment fractions were isolated. 展开更多
关键词 red pigment Serratia marcescens PRODIGIOSIN UV-VIS LC/MS
下载PDF
Study on the Stability of Pigment in Red Pulp Plum
11
作者 YuZeyuan XuYaqin 《Journal of Northeast Agricultural University(English Edition)》 CAS 1997年第1期68-72,共5页
The stability was studied of the pigment in red pulp plum (Prunus salicina Lindl). The results showed that the pigment had a high resistance to heat and it′s stability seemed to be affected greatly by pH, and red pu... The stability was studied of the pigment in red pulp plum (Prunus salicina Lindl). The results showed that the pigment had a high resistance to heat and it′s stability seemed to be affected greatly by pH, and red pulp plum was suitable to be applied for making acid food. Several kinds of metallic ions including Na + 、Zn 2+ had an effect of reinforcement on its tone, however Fe 3+ had a disruptive effect. Sucrose had no undesirable effect, but vitamin C had a significant undesirable effect. Also the preservative of sodium benzoate had a definite undesirable effect. The pigment showed strong resistance to reducer sodium sulfite but was very weak in resistance to oxidizer hydrogen peroxide. 展开更多
关键词 pigment red pulp plum STABILITY
全文增补中
Culture medium optimization for pigment production with RSM method 被引量:2
12
作者 WU Hongqing TIAN Li +2 位作者 ZHANG Jiuming SUN Zhaobin HUANG Leping 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2005年第5期145-149,共5页
Response surface methodology was used to optimize a medium for a red-pigmented marine bacterium S-9801 strain (Flavobocterium sp.). In the first optimization step the influence of yeast extract, peptone, glucose and... Response surface methodology was used to optimize a medium for a red-pigmented marine bacterium S-9801 strain (Flavobocterium sp.). In the first optimization step the influence of yeast extract, peptone, glucose and sodium chloride on pigment production was evaluated using a fractional factorial design. Pigment production was positively influenced by glucose and sodium chloride while other components had no significant effect. In the second step the path of steepest ascent was used to approach the optimal region of the medium composition. In the third step the optimal concentration of glucose and sodium chloride was determined by a central composite design and response analysis. The optimized medium allowed pigment production (A 535-650) to be increased from 0.137 to 0.559, being 320% higher than the original medium. 展开更多
关键词 response surface methodology red pigment OPTIMIZATION
下载PDF
Construction of high-density genetic linkage map of Pyropia yezoensis(Bangiales,Rhodophyta)and identifi cation of red color trait QTLs in the thalli
13
作者 Lu WANG Kuipeng XU +3 位作者 Xianghai TANG Junhao WANG Fanna KONG Yunxiang MAO 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2021年第3期1103-1117,共15页
Pyropia yezoensis is an important macroalga because of its extensive global distribution and economic importance.Color is an important trait in the thalli of P.yezoensis,it is also an effective marker to identify the ... Pyropia yezoensis is an important macroalga because of its extensive global distribution and economic importance.Color is an important trait in the thalli of P.yezoensis,it is also an effective marker to identify the hybridization in genetic breeding.In this study,a high-density genetic linkage map was constructed based on high-throughput single nucleotide polymorphism(SNP)markers,and used for analyzing the quantitative trait loci(QTLs)of red color trait in the thalli of P.yezoensis.The conchospore undergoes meiosis to develop into an ordered tetrad,and each cell has a haploid phenotype and can grow into a single individual.Based on this theory,F1 haploid population was used as the mapping population.The map included 531 SNP markers,394.57 cM long on average distance of 0.74 cM.Collinear analysis of the genetic linkage map and the physical map indicated that the coverage between the two maps was 79.42%.Furthermore,QTL mapping identified six QTLs for the chromosomal regions associated with the red color trait of the thalli.The value of phenotypic variance explained(PVE)by an individual QTL ranged from 4.71%-63.11%.And QTL qRed-1-1,with a PVE of 63.11%,was considered the major QTL.Thus,these data may provide a platform for gene and QTL fine mapping,and marker-assisted breeding in P.yezoensis in the future. 展开更多
关键词 Pyropia yezoensis high-density genetic linkage map quantitative trait loci(QTL)mapping F1 haploid population red pigment variant
下载PDF
Preparation of Novel Scorzalite Imitated Phosphate Pigments
14
作者 Hiroaki Onoda Ryota Sasaki 《材料科学与工程(中英文A版)》 2021年第2期35-39,共5页
Novel phosphate pigments imitated with Scorzalite,FeAl2(PO4)2(OH)2,were prepared from iron and aluminum nitrate solutions,ascorbic acid,and phosphoric acid with pH adjustments(pH 5,7,9).The obtained precipitates were ... Novel phosphate pigments imitated with Scorzalite,FeAl2(PO4)2(OH)2,were prepared from iron and aluminum nitrate solutions,ascorbic acid,and phosphoric acid with pH adjustments(pH 5,7,9).The obtained precipitates were heated at 300,500,and 700°C for 1 h.The precipitates and their thermal products were estimated with X-ray diffraction(XRD),Infrared(IR)spectra,ultraviolet-visible(UV-Vis)reflectance spectra,and L*a*b*color space.The precipitated sample was not clearly colored,but it turned orange to red when heated.Samples prepared at low pH showed higher whiteness than samples prepared at high pH.The theoretical amount of ascorbic acid was sufficient to completely reduce iron during the adjustment.This study showed the possibility of novel inorganic phosphate red pigment. 展开更多
关键词 Iron aluminum phosphate natural ore red pigment
下载PDF
前体物和诱导剂对红曲霉液态发酵产红曲红色素的影响
15
作者 李平 汪璇 +1 位作者 石昕芸 王伟平 《工业微生物》 CAS 2024年第3期144-146,共3页
为了提高红曲霉(Monascus)GN01液态发酵产红曲红色素(MRPs)的产量,文章采用单因素实验法考察前体物和诱导剂的种类,以及添加量对红曲霉产MRPs的产量的影响。研究结果表明,前体物和诱导剂都有利于促进MRPs的产生,但促进程度存在一定的差... 为了提高红曲霉(Monascus)GN01液态发酵产红曲红色素(MRPs)的产量,文章采用单因素实验法考察前体物和诱导剂的种类,以及添加量对红曲霉产MRPs的产量的影响。研究结果表明,前体物和诱导剂都有利于促进MRPs的产生,但促进程度存在一定的差异。作为前体物,CH3COONH(41 g/L)和CH3COOK(3 g/L)的处理分别将MRPs的产量提升了2.96倍和1.54倍;作为诱导剂,ZnSO(40.2 g/L)和曲拉通X-100(7%v/v)的处理分别将MRPs的产量提升了6倍和3倍,但曲拉通X-100的处理不利于红曲霉的生长。因此,CH3COONH4(1 g/L)和ZnSO(40.2 g/L)的处理更有助于进一步提高MRPs的产量。 展开更多
关键词 前体物 诱导剂 红曲红色素
下载PDF
改性蚕丝织物的胭脂虫红染色工艺探析
16
作者 武松梅 陈秀芳 《武汉纺织大学学报》 2024年第3期76-80,共5页
为使胭脂虫红上染蚕丝织物效果好,采用壳聚糖季铵盐(HACC)对蚕丝织物改性后,用胭脂虫红色素直接染色,探讨改性工艺。研究表明,最佳改性工艺条件为改性温度70℃,改性时间40 min,pH=5,HACC质量浓度4%。胭脂虫红对改性蚕丝织物进行直接染色... 为使胭脂虫红上染蚕丝织物效果好,采用壳聚糖季铵盐(HACC)对蚕丝织物改性后,用胭脂虫红色素直接染色,探讨改性工艺。研究表明,最佳改性工艺条件为改性温度70℃,改性时间40 min,pH=5,HACC质量浓度4%。胭脂虫红对改性蚕丝织物进行直接染色,得出优化的染色工艺条件为染色温度80℃,染色时间40min,pH=7,染液质量浓度6%。在最佳的工艺条件下,对未改性及改性蚕丝织物进行直接染色和后媒染,用环保的氯化镧稀土为媒染剂,对染色织物的染色性能、色牢度进行测试。结果表明,HACC改性试样经过后媒染法染色,其染色性能、色牢度最好,对生态染整技术发展提供积极的意义。 展开更多
关键词 胭脂虫红色素 真丝面料 壳聚糖季铵盐 改性工艺 染色工艺
下载PDF
滇鸡血藤红色素的提取工艺优化及其抑制COX-2活性研究
17
作者 乔子璇 姜丹 +4 位作者 任广喜 吴菲 李萌 华国栋 刘春生 《中国现代中药》 CAS 2024年第9期1570-1577,共8页
目的:研究滇鸡血藤红色素的最佳提取条件,考察其基本性质与环氧化酶-2(COX-2)抑制活性,为滇鸡血藤的临床用药及相关制剂开发提供参考。方法:以吸光度为指标,采用单因素试验和正交试验对滇鸡血藤红色素提取工艺中的液料比、浸提时间、乙... 目的:研究滇鸡血藤红色素的最佳提取条件,考察其基本性质与环氧化酶-2(COX-2)抑制活性,为滇鸡血藤的临床用药及相关制剂开发提供参考。方法:以吸光度为指标,采用单因素试验和正交试验对滇鸡血藤红色素提取工艺中的液料比、浸提时间、乙醇体积分数进行优化,确定滇鸡血藤红色素的最佳提取工艺,对提取得到的红色素光、热、pH稳定性进行考察,进一步采用COX-2抑制剂筛选试剂盒考察滇鸡血藤红色素对COX-2的抑制作用。结果:在50%乙醇、液料比为110、浸提12 h的条件下提取的滇鸡血藤红色素吸光度最大;其在室温避光、pH 1~9条件下有较好的稳定性;滇鸡血藤红色素对COX-2有较好的抑制作用,半数抑制浓度(IC50)为2.04 ng·mL^(-1)(生药质量浓度)。结论:明确了滇鸡血藤红色素的最佳提取条件和稳定性条件,可为滇鸡血藤资源的综合开发利用与临床用药研究提供参考。 展开更多
关键词 滇鸡血藤 红色素 环氧化酶-2 抑制率
下载PDF
索氏抽提法制备裂果枣红色素及其理化性质分析
18
作者 任瑞珍 薛建娥 《食品研究与开发》 CAS 2024年第10期171-180,共10页
以裂果枣粉为原料,采用索氏抽提法对裂果枣红色素进行提取,分别采用单因素试验和响应面试验进行提取条件的优化,并对裂果红枣色素进行理化性质研究(抗氧化活性及色素稳定性)。结果表明:索氏抽提法提取最佳条件为裂果枣粉添加量2.0 g/100... 以裂果枣粉为原料,采用索氏抽提法对裂果枣红色素进行提取,分别采用单因素试验和响应面试验进行提取条件的优化,并对裂果红枣色素进行理化性质研究(抗氧化活性及色素稳定性)。结果表明:索氏抽提法提取最佳条件为裂果枣粉添加量2.0 g/100 mL、乙醇体积分数69%、加热温度89℃、浸提时间26 min、抽提时间1.5 h,裂果枣红色素提取率4.540 mg/g,裂果枣红色素提取率较高。通过研究裂果枣红色素对DPPH自由基,·NO_(2)^(-)和ABTS+自由基的清除能力,结果显示裂果枣红色素浓度达到1.2 mg/mL时,DPPH自由基清除率可达67.8%,当裂果枣红色素浓度达到2.0 mg/mL时,NO_(2)^(-)清除率为69.4%,当裂果枣红色素浓度达到1.5 mg/mL时,ABTS^(+)自由基清除率达到63.5%。裂果枣红色素稳定性试验结果表明,索氏抽提法提取的裂果枣红色素具有良好的热稳定性,光照对其稳定性有一定的影响,pH值对裂果枣红色素稳定性的影响较大。 展开更多
关键词 裂果枣红色素 索氏抽提法 理化性质 抗氧化活性 稳定性
下载PDF
具有多刺激响应行为的颜料红254有机小分子荧光染料
19
作者 崔帅玮 梁东旭 +1 位作者 杨文君 张海昌 《青岛科技大学学报(自然科学版)》 CAS 2024年第5期62-66,共5页
对颜料红254进行N-烷基链双取代合成了化合物2,5-二庚烷基-3,6-二(4-氯苯基)-吡咯并吡咯-1,4-二酮(C7DPP),对其外界刺激条件产生变色的性质进行了研究,例如压力和温度。在365 nm紫外光激发下,旋转蒸发得到的固态粉末样品发出明亮的黄色... 对颜料红254进行N-烷基链双取代合成了化合物2,5-二庚烷基-3,6-二(4-氯苯基)-吡咯并吡咯-1,4-二酮(C7DPP),对其外界刺激条件产生变色的性质进行了研究,例如压力和温度。在365 nm紫外光激发下,旋转蒸发得到的固态粉末样品发出明亮的黄色荧光(563 nm),研磨后发光光色红移到了582 nm,经过溶剂熏蒸或135℃热处理的样品发出黄绿色荧光(537 nm),再次研磨又可回复到582 nm,光谱峰位移达到了45 nm。通过X射线衍射(XRD)测试分析表明,该分子表现出的力致变色行为与其分子的堆积结构变化有着密切的联系,表现出性能对结构的强响应。 展开更多
关键词 颜料红254 吡咯并吡咯二酮 力致变色 热致变色 多刺激响应型材料
下载PDF
超高压物理改性处理提高甜菜红的热稳定性及应用
20
作者 郑敦锦 祝顺 +4 位作者 敬思群 谭艳仪 张俊艳 郑庆东 丁志昆 《中国食物与营养》 2024年第6期43-50,共8页
目的:甜菜红易在碱性、高温等条件下发生褪色,分别采用超高压技术(UHP)、脉冲电场(PEF)、动态高压微射流(DHPM)技术对甜菜红进行物理改性,以吸光度值为考察指标,确定合适的提高甜菜红热稳定性的物理改性技术。方法:通过扫描电子显微镜(S... 目的:甜菜红易在碱性、高温等条件下发生褪色,分别采用超高压技术(UHP)、脉冲电场(PEF)、动态高压微射流(DHPM)技术对甜菜红进行物理改性,以吸光度值为考察指标,确定合适的提高甜菜红热稳定性的物理改性技术。方法:通过扫描电子显微镜(SEM)、傅里叶变换红外光谱(FTIR)及高效液相色谱(HPLC)分析揭示了超高压处理提高甜菜红热稳定性的机制;以未经超高压处理的甜菜红作对照组、超高压处理的甜菜红为原料制作曲奇饼干,验证超高压处理提高甜菜红热稳定性作用。结果:在400 MPa、保压时间30 min、室温的处理条件下,甜菜红的热稳定性显著高于其他条件下的样品;超高压处理提高了甜菜红的热稳定性,对甜菜红的特征官能团没有显著影响,但使其组分比例发生了改变;以超高压处理的甜菜红色素制作的饼干与未处理的相比,烘烤前后饼干色差变化幅度小。结论:超高压处理是提高甜菜红色素热稳定性的有效方法。 展开更多
关键词 甜菜红 稳定性 超高压处理 表征 饼干色差
下载PDF
上一页 1 2 77 下一页 到第
使用帮助 返回顶部