摘要
为分析冬枣果皮色素提取液的组成和色素的结构特征,对枣皮醇提液进行系统萃取后得乙酸乙酯相(Ⅰ)、正丁醇相(Ⅱ)、水相(Ⅲ)三组分,对各组分进行含量测定及显色反应后,又进一步测定了UV-vis和IR光谱。结果:乙酸乙酯(Ⅰ)、正丁醇(Ⅱ)和水(Ⅲ)三相颜色分别为黄、桔和红色;乙酸乙酯相(Ⅰ)中总黄酮和总酚含量最高而水相(Ⅲ)中两者含量均最低;乙酸乙酯相(Ⅰ)和正丁醇相(Ⅱ)均表现出典型二氢黄酮结构现象,水相的颜色变化较弱;UV-vis光谱:各组分在280nm附近均存在较强的吸收峰;其中乙酸乙酯相(Ⅰ)、正丁醇相(Ⅱ)分别在305和350nm附近存在肩峰吸收;IR光谱:三者均在3270、2930、1605、1447、1356、1280、1250、1197、1140、1060、1010、868、817、777、620cm-1附近存在吸收峰,其中(Ⅰ)和(Ⅱ)、(Ⅲ)在1670和1518cm-1附近存在显著差异。综上可得,冬枣皮色素溶液中含有多酚、黄酮和一类红色水溶性色素(极性较大,萃取后保留在水相中),鉴定反应和紫外图谱均说明其并非黄酮类物质,结合红外图谱特征分析该水溶性色素可能是一类含有苯环和羟基的大分子酚类物质。
In order to investigate the pigments＇ composition and structural properties of Ziziphus jujube peel extracts, after systematic extraction, the pigments were mainly distributed in ethyl acetate （I）, n - butanol （II） and aqueous （III） phases. Then, before the content measurement, the color reaction, UV-visible spectroscopy and infrared spectroscopy were detected successively. Conclusion. the colors of three phases were yellow, orange and red, respectively. Content measurement reflected that ethyl acetate phase （I） contained the highest total flavonoids and phenolic acids, while least in aqueous phase （111）. Both ethyl acetate （I） and n - butanol （II） exhibited obviously color change induced by the typical flavonoid structure substance, while the color changes of aqueous （111） phases were weak during the color reaction. It＇s observed that there were apparent peaks near 280nm for each phases, shoulder peaks near 305 and 350nm were observed in ethyl acetate （I） and n - butanol （11）, respectively in the UV-visible spectrum; IR spectrum revealed that 3270, 2930, 1605, 1447, 1356, 1280, 1250, 1197, 1140, 1060, 1010, 868, 817,777,620cm -1 were the main absorption of the three phases. It revealed that Ziziphus jujube peel extracts contained phenolic acids, flavonoids, and a kind of red pigment （water - soluble, enriched in aqueous phase （III））, according to phenomenon in aqueous phase, it could be neither flavonoid nor phenolic acids, but substances containing benzene and hydroxyl group.
出处
《食品工业科技》
CAS
CSCD
北大核心
2013年第13期99-102,105,共5页
Science and Technology of Food Industry
基金
林业局948项目(2012-4-12)
国家863项目(2011AA100802-9)
关键词
红枣皮
天然色素
化学结构
黄酮
多酚
ziziphus jujube peel
natural pigment
chemical structure
flavonoids
polyphenol
