کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7583964 | 1492021 | 2019 | 31 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Molar absorptivities (ε) and spectral and colorimetric characteristics of purple sweet potato anthocyanins
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کلمات کلیدی
CAFInternational Commission on IlluminationCIEEtOHEthanol - اتانولColor - رنگCyanidin - سایانیدینIpomoea batatas - سیب زمینی IpomoeaMolar extinction coefficient - ضریب انقراض مولیMethanol - متانولMeOH - مونPelargonidin - پلارگونیدینPeonidin - پیونیدینHigh pressure liquid chromatography - کروماتوگرافی مایع با فشار بالاHPLC - کروماتوگرافی مایعی کاراGlu - گلوGlucoside - گلوکوزید
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Purple sweet potato, a source of acylated cyanidin and peonidin derivatives, is commercially available as a food colorant. Our objectives were to determine molar absorptivities (ε), spectral and colorimetric properties of purple sweet potato anthocyanins. Anthocyanins were isolated by semi-preparative HPLC, weighed, dried, and redissolved in acidic methanol or water. Anthocyanins were diluted in pH 1-9; ε, spectra, and color were measured on the methanolic and aqueous solutions. Higher ε were obtained in 0.1% HCl methanol (10,797-31,257â¯L/(molâ¯Ãâ¯cm)) than in aqueous solution pH 1 (8861-24,303â¯L/(molâ¯Ãâ¯cm)). Peonidin-3-sophoroside-5-glucoside had greatest ε in pH 1, but in alkaline pH, ε of acylated Peonidin-3-sophoroside-5-glucoside derivatives were greatest. Generally monoacylation decreased ε while diacylation increased ε. Location of acylation also affected ε of two Peonidin isomers (pH 1: 15,999 and 21,011â¯L/(molâ¯Ãâ¯cm)). All anthocyanins expressed red-pink hues (330°-13.2°) in acidic pH and blues (230°-262°) in alkaline pH.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Chemistry - Volume 271, 15 January 2019, Pages 497-504
Journal: Food Chemistry - Volume 271, 15 January 2019, Pages 497-504
نویسندگان
Gregory T. Sigurdson, Rebecca J. Robbins, Thomas M. Collins, M. Mónica Giusti,