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KMID : 0380619950270010097
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Korean Journal of Food Science and Technology
1995 Volume.27 No. 1 p.97 ~ p.100
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Stability of Naphthoquinone Pigments Isolated from the Roots of Lithospermum erythrorhizon by Various Temperatures and Metal Ions
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Abstract
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The pigments of acetylshikonin and isobutylshikonin isolated from the roots of Lithospermum erythrorhizon were determined over a period of storage for their stabilities influenced by temperatures and metal ions. In dark condition, both pigment solution were unstable at 488 and 560 nm; alcoholic solutions of acetylshikonin pigment were stable at 25℃ and 50℃ for 1 hour, but isobutylshikonin showed severe discoloration within 1 hour at 95℃ . Buffered solutions of acetylshikonin tended to be discolored with the addition of Fe^(++), while those of isobutylshikonin with Fe^(++) and Cu^(++). These studies indicated that acetylshikonin and isobutylshikonin can be used in foods as the natural colorant under selected conditions in case of considering storage temperature and metal ions.
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