4.5 Article

Effect of lactic acid fermentation on the quality and phytochemical constituent in smoothies made from the leaves of different sweet potato (Ipomoea batatas L.) cultivars

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WILEY
DOI: 10.1111/ijfs.16576

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Antioxidants; carotenoids; lactic acid fermentation; Lactiplantibacillus plantarum 75; smoothies; sweet potato cultivars

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This study investigated the effects of fermentation by Lactiplantibacillus plantarum 75 (L75) on the properties of sweet potato leaf smoothies. Fermentation significantly improved the physicochemical properties, antioxidant content, and sensory characteristics of the smoothies. Principal component analysis showed a clear separation between fermented and unfermented smoothies. The survival of L75 was influenced by fermentation duration and sweet potato cultivar. Both fermented and unfermented smoothies were equally acceptable in terms of taste.
This study investigated the effect of fermentation by Lactiplantibacillus plantarum 75 (L75) on the physicochemical properties, survival of L75, sensory, antioxidants and their activities in leaf smoothies of six sweet potato cultivars [Orange-fleshed (OFSP): 'Bophelo', and 'Beauregard'; cream-fleshed (CFSP): 'Blesbok' and 'Ndou'; and purple-fleshed (PFSP): '08.21p' and 'Purple-purple']. Fermentation significantly affected the physiochemical properties. Fermentation for 24 h improved the carotenoid (TCC), ascorbic acid (AA) (6.8, 6.0 mg 100 g(-1)) and total phenolic (4435 mg 100 g(-1)) significantly in, 'Bophelo' smoothies. Whilst 48 h fermentation significantly increased the TCC, AA, organic acids, valine and alanine levels in 'Blesbok' smoothies'. Principal component analysis separated the unfermented 'Bophelo' and Purple-purple' leaf smoothies from fermented leaf smoothies of OFSP, CSFP, and PFSP. DPPH scavenging activity and alpha-carotene were effective markers for separating fermented from unfermented leaf smoothies in the variable importance study. Survival of L75 was influenced by fermentation duration and cultivar type. Fermented and unfermented smoothies were equally acceptable.

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