In vitro fermentability of differently digested resistant starch preparations

✍ Scribed by Caroline Fässler; Eva Arrigoni; Koen Venema; Fred Brouns; Renato Amadò

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 724 KB
• Volume: 50
• Category: Article
• ISSN: 1613-4125
• DOI: 10.1002/mnfr.200600106

✦ Synopsis

Abstract

The in vitro fermentability of two resistant starch preparations type 2 (RS2) and type 3 (RS3) was investigated using human colonic microbiota. Prior to the fermentation experiments, samples were digested using two in vitro models, a batch (ba) and a dynamic (dy), as well as an in vivo method (il) for RS3. Digestion residues were fermented in vitro using a simple batch model lasting 24 h and a more sophisticated dynamic model enduring 72 h. During batch fermentation, metabolite productions and starch degradation rates were similar for RS2 and RS3 but higher for dy‐ compared to ba‐digested samples. RS3__il__ led to the lowest fermentability. Furthermore, increased butyrate ratios were observed for all preparations. The varying RS preparations behaved similarly in the dynamic fermentation but showed high SDs. Moreover, the fermentability was slow during the first 24 h, indicating that the microbiota needed an adaptation period to ferment RS. Propionate ratios increased at the expense of butyrate with exception for RS2__dy__ showing an increase in acetate only. Differences in fermentability observed between the dynamic model, allowing a closer simulation of the in vivo behavior, and the batch model, recommended for screening purposes, could be due to the varying microbiota used.