Journal of Industrial and Engineering Chemistry, Vol.7, No.6, 375-379, November, 2001
Quantitative Analysis of Crocetin Colorants in Gardenias (Gardenia jasminoides Ellis) by LC/DAD/MS
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For the quantification of yellow coloring materials in gardenia utilized as natural food colorants and for dyeing fabrics, the fruits of fully matured Gardenia jasminoides were characterized by LC/DAD/MS analysis. The five yellow coloring materials with crocetin chromophore were analyzed by HPLC and characterized by DAD and MS analysis. The molar compositions of each crocetin colorant were measured as follows; trans-crocetin di(β-gentiobiosyl) ester 1 [58 mol %], trans-crocetin mono(β-gentiobiosyl) monoglucosyl ester 2 [13 mol %], trans-crocetin diglucosyl ester 3 [20 mol %], crocetin 4 [7 mol %] and trans-crocetin monoglucosyl ester 5 [2 mol %]. With molar absorptivity of the major colorant 1 that was first measured as ε 103000 dm(3) mol(-1) cm(-1) at λ(max) 440 nm, total crocetin content per mass of dried whole gardenia fruit was quantified as 3.4 μ mole/g of crocetin aglycone.
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