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 Citrus and Other Subtropical Products Research: Fort Pierce, FL
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ARS Home Southeast Area Fort Pierce, Florida U.S. Horticultural Research Laboratory Citrus and Other Subtropical Products Research Research Publications at this Location





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Title:   Author  item
                                            Bai, Jinheitem
                                            FORD, BRYAN - Former ARS Employeeitem
                                            Manthey, Johnitem
                                            Baldwin, Elizabeth

                                                         - *Liz*
  Submitted to: Proceedings of Florida State Horticultural Society
                                    Publication Type: Proceedings
                                    Publication Acceptance Date: 12/5/2010
                                    Publication  Date: 12/29/2010
                                    Citation: Bai, J., Ford, B.L., Manthey, J.A., Baldwin, E.A. 2010. A comparison of processed and fresh squeezed ‘Hamlin’ orange juice - nutrients and phytonutrients. Proceedings of Florida State Horticultural Society. 123:207-212.Interpretive Summary:
                                Technical Abstract: ‘Hamlin’ orange juices were extracted using one of following methods: 1) freshly squeezed with a commercial food service squeezer (fresh), 2) freshly squeezed + pasteurized (fresh/pasteurized), and 3) processed with industrial extractor and pasteurized (processed). Samples were taken directly after juice extraction and again after 4 days of storage at 5 °C for analysis of flavonoids, limonoids, alkaloids, carotenoids, ascorbic acid and total phenolic content. Processed juice had higher levels of insoluble solids, but lower levels of peel oil in comparison with fresh juices regardless of pasteurization. The majority of flavanones including hesperidin, narirutin, narirutin 4'-glucoside, 6,8-di-C-glucosyl apigenin and isosakuranetin rutinoside, which are rich in albedo and segment membranes, exhibited high levels in the processed juice. On the other hand, flavones associated with peel oil, such as quercetagetin hexamethyl ether, sinensetin, nobiletin, tetramethylscutellarein, heptamethoxyflavone and tangeretin had high contents in the fresh juices. Limonoids (limonin glucoside, limonin aglycone, nomilin glucoside, nomilinic acid glucoside, and nomilin aglycone), alkaloids (ferulyol putrescine and an unknown alkaloid) and carotenoids (zeaxanthin, lutein, ß-cryptoxanthin, a-carotene and ß-carotene) had higher contents in the processed juice than in the fresh juice regardless of pasteurization. The processed juice had higher total phenolic contents but lower ascorbic acid content than in the fresh juices. Thermal pasteurization increased contents of flavones, but decreased contents of carotenoids. During 4 d storage at 5 °C, 20-80% flavanones, including hesperidin, narirutin, narirutin 4’-glucoside and isosakuranetin rutinoside, precipitated in the processed juice but not the fresh juice.


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