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Current Nutrition & Food Science

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ISSN (Print): 1573-4013
ISSN (Online): 2212-3881

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Research Article

Effects of Cooking Processes on Breath Hydrogen and Colonic Fermentation of Soybean

Author(s): Naoya Okumura, Naoya Jinno, Kentaro Taniguchi, Kenichi Tanabe, Sadako Nakamura, Takaharu Kondo and Akito Shimouchi*

Volume 16, Issue 4, 2020

Page: [488 - 493] Pages: 6

DOI: 10.2174/1573401316666200226104601

open access plus

Abstract

Background: Soybean is rich in dietary fibers; consequently, soybean ingestion considerably increases the breath level of hydrogen molecules via anaerobic colonic fermentation. However, the influence of cooking methods on this effect, which can affect the overall health benefits of soybean, remains unknown.

Objectives: The aim is to examine whether different methods of cooking soybean affect the colonic fermentation process.

Methods: Nine healthy adult volunteers participated in the study; they ingested either roasted soybean flour (kinako) or well-boiled soybean (BS). Differences in their breath components were compared. Both test meals were cooked using 80 g of soybeans per individual. After a 12 h fast, the participants ate the test meals, and their breath hydrogen level was analyzed every 1 h for 9 h by using a gas chromatograph with a semiconductor detector. In addition, particle size distribution and soluble/ insoluble fibers in the feces were examined.

Results: The oro-cecal transit time did not significantly differ between individuals who ingested kinako and BS. However, the area under the curve between 7 and 9 h after the ingestion of BS was significantly increased compared with that after the ingestion of kinako. The nutritional analysis indicated that the content of both soluble and insoluble fibers in BS was higher than that in kinako. In addition, the levels of unfermented fragments and soluble/insoluble fibers in the feces were increased after the ingestion of kinako compared with those after the ingestion of kinako.

Conclusion: Cooking methods alter the composition of non-digestible fibers in soybean, and this can result in the lack of fermentative particles in the feces, thereby causing alterations in the breath level of hydrogen via colonic fermentation.

Keywords: Boiled soybean, breath hydrogen, colonic fermentation, cooking process, kinako, soybean fiber.

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