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NOTA SÔBRE A DOSAGEM IODOMÉTRICA DA VITAMINA C NOS FRUTOS CÍTRICOS
Alternative title
Iodometric determination of vitamin C in citrus fruit juicesAffilliation
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Rio de Janeiro, RJ, Brasil.
Instituto de Higiene Experimental de Assunção. Paraguai
Instituto de Higiene Experimental de Assunção. Paraguai
Abstract
Ascorbic acid was determined in pure aquous solutions and in citrus fruit juices by iodometric, dichlorophenolindophenol and iodate methods. More constant values were obtained with iodate and Tillmans methods. Iodate is preferable owing to the stability of solution and the simplicity of the method. In the analysis of citrus juices the iodate method proposed by Ballentine is very accurate and suitable for routine work (Table I and II). Recovery experiments recorded in Table III show that the results are reproducible. The averages obtained for some fruits are shown in Table IV. Lemon: 45,4 to 67,3; orange: 28,0 to 60,8; lima: 25,2 to 38,2 and mandarine: 32,0 to 59,3. Values expressed in mg per 100 cc. of juice.
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