Passion fruit by-product and fructooligosaccharides stimulate the growth and folate production by starter and probiotic cultures in fermented soymilk

• Published in: International journal of food microbiology 2017-11, Vol.261, p.35-41
• Main Authors: Albuquerque, Marcela Albuquerque Cavalcanti, Bedani, Raquel, LeBlanc, Jean Guy, Saad, Susana Marta Isay
• Format: Article
• Language: English
• Subjects: Bacteria; Bioreactors; Byproducts; Coculture Techniques; Culture Media - metabolism; Diet; Environmental conditions; Fermentation; Fermented soymilk; Folate; Folic acid; Folic Acid - biosynthesis; Formulations; FOS; Fructooligosaccharides; Fruit - metabolism; Fruit - microbiology; Fruits; Lactobacilli; Lactobacillus - growth & development; Lactobacillus - metabolism; Microorganisms; Oligosaccharides; Oligosaccharides - metabolism; Passiflora - metabolism; Passiflora - microbiology; Passion by-product; Passion fruit; Probiotic; Probiotics; Probiotics - metabolism; Soy Milk - metabolism; Soya bean milk; Starter cultures; Strains (organisms); Streptococcus - growth & development; Streptococcus - metabolism; Vitamin B; Waste Products - analysis
• ISSN: 0168-1605; 1879-3460
• DOI: 10.1016/j.ijfoodmicro.2017.09.001

Two starter cultures (Streptococcus (St.) thermophilus ST-M6 and TA-40) and five probiotic strains (St. thermophilus TH-4, Lactobacillus (Lb.) acidophilus LA-5, Lb. rhamnosus LGG, Lb. fermentum PCC, and Lb. reuteri RC-14) were used to ferment different soymilk formulations supplemented with passion fruit by-product and/or fructo-oligosaccharides (FOS) with the aim of increasing folate concentrations. Growth and folate production of individual strains were evaluated and the results used to select co-cultures. Both St. thermophilus ST-M6 and TH-4 were the best folate producers and were able to increase the folate content of all soymilk formulations when used alone or in co-culture with lactobacilli strains, especially in the presence of both passion fruit by-product and FOS. Thus, passion fruit by-product and FOS could be used as dietary ingredients to stimulate the folate production by selected bacterial strains during the fermentation of soymilk. It was also shown that vitamin production by microorganisms is strain-dependent and may also be influenced by nutritional and environmental conditions. •St. thermophilus and Lactobacillus strains were applied in soymilk bioenrichment.•STM-6 and TH-4 produced the highest folate content in all soymilk formulations.•Passion fruit by-product improved growth and folate production by LA-5 and PCC.•Folate production was strain dependent and influenced by the food matrix.•Passion fruit by-product and FOS improved the folate production by TH-4+LGG.