摘要
Short-chain fatty acids (SCFAs) are products of dietary fiber fermentation. As such, fiber digestibility is thought to be related to SCFA production. The effects of two concentrations of cereal fiber as wheat bran (WB) and vegetable fiber (VF) on fiber digestibility were examined in 34 free-living volunteers. Five diets consisting of a fiber-free liquid nutrition supplement and quick breads containing either (1) 0 g of fiber, (2) 10 g of WB, (3) 30 g of WB, (4) 10 g of VF, or (5) 30 g of VF were consumed in random order. Apparent digestibility of neutral detergent fiber (NDF) was determined. Colonic fluid, collected by in vivo dialysis in 9 subjects, was analyzed for SCFAs by gas chromatography. Digestibility of NDF was greater with WB than with VF ingestion in those 9 subjects, but digestibility was not different with ingestion of both fibers when all 34 subjects were considered. No effect of intake level was seen with either WB or VF. Fiber ingestion increased acetate, propionate, and butyrate concentrations above those on the 0 g of fiber diet (43%, 31%, and 90%, respectively; p < .0001). Propionate and butyrate concentrations were greater on WB than VF (p < .01); acetate concentrations were similar with both fibers. No correlation between NDF digestibility and SCFA concentrations was observed. Despite differences in origin, chemistry, particle size, and subject transit time, the WB and VF were similar in NDF fermentability. Molar ratios of specific SCFAs were influenced by type of fiber ingested. (Journal of Parenteral and Enteral Nutrition18:14-19, 1994)
摘要译文
短链脂肪酸（SCFA）是膳食纤维发酵的产物。因此，纤维消化率被认为与SCFA生产有关。在34名自由生活的志愿者中检查了两种浓度的谷物纤维（如麦麸（WB）和植物纤维（VF））对纤维消化率的影响。（1）0g纤维，（2）10g WB，（3）30g WB，（4）10g VF，或者含有纤维的液体营养补充剂和快速面包或（5）以随机顺序消耗30克VF。测定中性洗涤纤维（NDF）的表观消化率。通过9名受试者体内透析收集的结肠液，用气相色谱分析SCFAs。在这9个受试者中，用WB测得NDF的消化率高于VF，但考虑到所有34名受试者的消化率与两种纤维摄取无差异。无论是WB还是VF，摄入量都没有影响。纤维摄入增加醋酸，丙酸和丁酸的浓度高于0g纤维饲料（分别为43％，31％和90％; p 0.0001）。丙酸和丁酸的浓度在WB上高于VF（p 0.01）。醋酸盐浓度与两种纤维相似。未观察到NDF消化率和SCFA浓度之间的相关性。尽管起源，化学，粒度，和受试物通过时间，在NDF发酵性中，WB和VF相似。特定SCFAs的摩尔比受到摄入纤维类型的影响。（Journal of Parenteral and Enteral Nutrition18：14-19,1994）
Susan B. Fredstrom; MS; RD. Apparent Fiber Digestibility and Fecal Short-Chain Fatty Acid Concentrations With Ingestion of Two Types of Dietary Fiber[J]. Journal of Parenteral and Enteral Nutrition, 1994,18(1): 14-19