The influence of water activity on the stability of curcuminoid pigments in curcumin- and turmeric oleoresin- microcrystalline cellulose model systems during storage at 21 ± 1C was investigated. The water adsorption characteristic of the model systems was determined. The samples were stored under nitrogen/darkness, nitrogen/light, air/darkness and air/light at water activities of 0.33, 0.57 and 0.97. At specific time intervals, samples were analyzed spectrophotometrically for curcuminoid pigments content. The degradation of curcuminoids in every condition tested followed a first order reaction. Curcuminoid pigments were observed to be sensitive to light, however the combined effects of air and light were the most deleterious. There was no influence of water activity on the stability of curcuminoid pigments in curcumin- and turmeric oleoresin-microcrystalline cellulose model systems.
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Souza et al. (1997) studied this question.
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