Abstract
The possibility of purity analysis of Citrus Unshiu juice by means of the carotenoid pattern has been examined.
Investigations of carotenoid pattern of several citrus fleshes showed two typical pattern; one was the Naruto orange type which contained about 50% of diol diepoxid and the other was Unshiu type in which monol carotenoid occurred in amounts of 70% or more.
The carotenoid pattern of commercial mature green Unshiu flesh was identical to the pattern of general Unshiu fleshes at immature stage. Carotenoid patterns of mature Unshiu fleshes which obtained from eight main growing districts indicated that the fleshes contained 2mg% or more of total carotenoids and 70% or more of monol plus monol monoepoxide carotenoids and 10% or less of hydrocarbon carotenoids regardless of growing area and varieties.
The carotenoid pattern of ten commercial samples of canned straight juice were quite similar to that of raw materials "Citrus Unshiu."
These results suggested the applicability of carotenoid pattern for the purity analysis of Citrus Unshiu juice.
