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Type: Artigo de periódico
Title: HPLC analysis of carotenoids in orange juice
Author: Pupin, AM
Dennis, MJ
Toledo, MCF
Abstract: Lutein, zeaxanthin, beta-cryptoxanthin, alpha-carotene and B-carotene have been determined in samples of Brazilian orange juice (Citrus sinensis). The concentrations found in factory-produced concentrates have been compared with those obtained on the Brazilian retail market and with authentic hand-squeezed juices. The analyses of the latter enabled a comparison of varieties to be made. A concentration range of 0.11-1.21 mg litre(-1) was determined for total carotenoids with beta-carotene, the most important source of Vitamin A, being found in the highest concentration in the Pera variety followed by Val (e) over cap ncia, Natal, Lima and Baia varieties. The total carotenoids present in samples of frozen concentrated orange juice (FCOJ) obtained from factories ranged from 0.26-0.48 mg litre(-1), while retail samples of this product contained slightly more (0.46-0.81 mg litre(-1)). Frozen concentrated orange pulp-wash presented much lower concentrations, ranging from 0.04 to 0.08 mg litre(-1) of total carotenoids. Fourteen samples of retail freshly-squeezed orange juice contained carotenoids ranging from 0.04 to 0.55 mg litre(-1), with only one sample out of the range found for authentic samples. This could be due to the addition of pulp-wash to this sample, in which undeclared sorbic acid was also detected. (C) 1998 Elsevier Science Ltd. All rights reserved.
Country: Inglaterra
Editor: Elsevier Sci Ltd
Citation: Food Chemistry. Elsevier Sci Ltd, v. 64, n. 2, n. 269, n. 275, 1999.
Rights: fechado
Identifier DOI: 10.1016/S0308-8146(98)00095-8
Date Issue: 1999
Appears in Collections:Unicamp - Artigos e Outros Documentos

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