A randomised, double-blind, placebo controlled cross-over study to determine the gastrointestinal effects of consumption of arabinoxylan-oligosaccharides enriched bread in healthy volunteers

Nutrition Journal

Glenn R Gibson¹  Filip Arnaut²  Isabel Trogh²  Congyi Lu¹  Gemma E Walton¹ 

[1]Department of Food and Nutritional Sciences, University of Reading, Reading, RG6 6AP, United Kingdom

[2]Puratos Group, Industrialaan 25, Zone Maalbeek, 1702, Groot-Bijgaarden, Belgium

关键词: Human gut microbiota;    Faecal;    Intestine;    Butyrate;    Bifidobacteria;    Arabinoxylan-oligosaccharides;    Prebiotic;   

Others  :  824326
DOI  :  10.1186/1475-2891-11-36

 received in 2011-11-01, accepted in 2012-05-15,  发布年份 2012

【 摘 要 】

Background

Prebiotics are food ingredients, usually non-digestible oligosaccharides, that are selectively fermented by populations of beneficial gut bacteria. Endoxylanases, altering the naturally present cereal arabinoxylans, are commonly used in the bread industry to improve dough and bread characteristics. Recently, an in situ method has been developed to produce arabinoxylan-oligosaccharides (AXOS) at high levels in breads through the use of a thermophilic endoxylanase. AXOS have demonstrated potentially prebiotic properties in that they have been observed to lead to beneficial shifts in the microbiota in vitro and in murine, poultry and human studies.

Methods

A double-blind, placebo controlled human intervention study was undertaken with 40 healthy adult volunteers to assess the impact of consumption of breads with in situ produced AXOS (containing 2.2 g AXOS) compared to non-endoxylanase treated breads. Volatile fatty acid concentrations in faeces were assessed and fluorescence in situ hybridisation was used to assess changes in gut microbial groups. Secretory immunoglobulin A (sIgA) levels in saliva were also measured.

Results

Consumption of AXOS-enriched breads led to increased faecal butyrate and a trend for reduced iso-valerate and fatty acids associated with protein fermentation. Faecal levels of bifidobacteria increased following initial control breads and remained elevated throughout the study. Lactobacilli levels were elevated following both placebo and AXOS-breads. No changes in salivary secretory IgA levels were observed during the study. Furthermore, no adverse effects on gastrointestinal symptoms were reported during AXOS-bread intake.

Conclusions

AXOS-breads led to a potentially beneficial shift in fermentation end products and are well tolerated.

【 授权许可】

   
2012 Walton et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1 .

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