Colourants - Raw SugarTopics:
By Bento, Luis San Miguel
Posted on 2007-06-16 Last edited on 2012-01-24
Colourants distribution in the crystal and in the syrup layer is important to understand colour distribution during refining. Raw sugar is considered to have good refing quality when, after affination, the percentage of colourants in the affined crystal is low.
Phenolic compounds of flavonoid type also contribute to raw sugar colour. Concentration of these compounds in Australian raws vary between 10 ppm and 60 ppm, contributing untill 30% of sugar colour, at pH 7 (Smith and Paton, 1985).
Bento et al. (1997) using GPC - Gel Permeation Chromatography and a ELS - Evaporative Light Scattering detector demonstrated that clourants with high molecular weight in raw sugar have tendency to remain in sugar crystal after affination.
Bento L.S.M., Pereira M.E., Sa S., 1997, Gel permeation chromatography of sugar
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