4.6 Article

Effect of Addition of Pectins from Jujubes (Ziziphus jujuba Mill.) on Vitamin C Production during Heterolactic Fermentation

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MOLECULES
卷 25, 期 11, 页码 -

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MDPI
DOI: 10.3390/molecules25112706

关键词

jujube; harvesting stage; pectin; methoxylation degree; kefir; vitamin C; heterolactic fermentation

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Soluble fibers, including pectins from apple and lemon, are commonly used as prebiotic and to prepare functional foods. The present study aimed to investigate the physicochemical and functional properties of pectins extracted from jujubes (Ziziphus jujuba Mill.). Pectins were extracted from jujubes at three stages of harvesting and characterized by FTIR and SEM analyses. Whole milk inoculated with kefir grains was supplemented by 0.25 mgmL(-1) of pectins. The pH value and vitamin C content were evaluated after 24 and 48 h of fermentation. Pectins from jujubes at the first harvesting stage (PJ1K) showed the lowest methoxylation degree. The addition of pectins enhanced the production of vitamin C during heterolactic process. This result was found to depend on jujube harvesting stage as PJ1K stimulated the growth of yeasts in kefir grains yielding to the highest amount of vitamin C (0.83 +/- 0.01 mu gmL(-1)) compared to other samples (0.53-0.60 mu gmL(-1)) at 24 h. Lactic acid bacteria diminish pH rapidly with respect to control (4.13 +/- 0.05), according to the stage of maturation, reducing its initial value by 38.3% in PJ1K. Besides being an excellent prebiotic, pectins from jujubes could be used to enrich kefir with vitamin C.

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