Konjac root fiber, broken down smartly, feeds gut bacteria better
Yang S, Chen X, Li Z, Yang R, Zhao D
Gut Microbiome
Konjac, the starchy corm behind the konjac yam and products like shirataki noodles, turns out to work even better for gut health when processed in a specific way, so how a food is made matters as much as what it's made from.
Researchers took the fiber from konjac, a starchy root plant also called konjac yam, and used a bacterial enzyme to chop it into smaller pieces. These smaller fiber fragments turned out to be great food for helpful gut bacteria like Bifidobacterium and Lactobacillus strains, while actually suppressing troublemakers like E. coli relatives and Klebsiella. In lab fermentation tests mimicking the gut, the treated fiber boosted beneficial bacterial diversity and increased production of short-chain fatty acids, compounds linked to a healthier gut lining and reduced inflammation.
Key Findings
Enzymatic treatment produced konjac oligo-glucomannan (KOGM) with average molecular weight of 13.4 kDa, optimized at 50°C, pH 6.0, 80 U/mL enzyme, 180 minutes
KOGM selectively promoted growth of beneficial bacteria (Lacticaseibacillus paracasei, Lactiplantibacillus plantarum) while inhibiting harmful bacteria (Klebsiella pneumoniae, Enterobacter spp.)
Fecal fermentation tests showed KOGM combined with enzyme produced highest acetate (2062.72 µg/mL) and lowest pH (3.89), while untreated konjac glucomannan (KGM) alone produced the most butyrate (206.7 µg/mL), and KOGM enriched beneficial genera like Bifidobacterium and Prevotella while reducing Escherichia-Shigella
chevron_right Technical Summary
Scientists used a bacterial enzyme to break down konjac root fiber into smaller sugar chains that feed good gut bacteria while starving harmful ones, boosting beneficial microbes and the short-chain fatty acids that support gut health.
Abstract Preview
Original paper
Prebiotic potential and modulation of the fecal microbiota by konjac oligo-glucomannan prepared using Pediococcus acidilactici mannanase.
In this study, konjac oligo-glucomannan (KOGM) was prepared from konjac glucomannan (KGM) by enzymatic hydrolysis using β-mannanase derived from Pediococcus acidilactici HDM2. The prepared KOGM had...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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Amorphophallus konjac, commonly known as juruo, konnyaku or konjac, or moyu, is a species of flowering plant in the family Araceae. In English, it is also referred to as devil's tongue, voodoo lily, snake palm, or elephant yam.