食品伙伴网导读：台湾中山医学大学的科研人员公布的一项研究结果：玉米提取物中的益生元---异麦芽低聚糖可改善易便秘的老年人的排便习惯。根据营养（Nutrition）杂志的报道，每日摄入10g的异麦芽低聚糖可改善肠道中菌群的状况，也可降低血液中胆固醇的水平。“异麦芽低聚糖（IO），如异麦芽糖、潘糖、异麦芽三糖和异麦芽四糖在日本发酵食品味噌，酱油等之中是自然存在的，而这些商品则是使用玉米淀粉制造的，所以，玉米淀粉即将成为一种功能性食品配料。”研究者解释。
台湾研究人员招募了13名便秘的平均年龄82.5岁的老人作为受试者，随机分派他们接受日常异麦芽低聚糖补充剂（每天10克）或安慰剂（果糖）进行八周实验。 数据表明，4周后摄入异麦芽低聚糖的小组，粪便中双歧杆菌，乳酸杆菌的水平显着增加，而梭状芽胞杆菌的水平下降后。 8周后，总胆固醇水平从4.1 mmol / L下降到3.6 mmol / L，而低密度脂蛋白水平从2.4 mmol / L下降到2.1 mmol / L。
原文报道：Corn extract may ease constipation in the elderly
By Stephen Daniells, 20-Jul-2010
Daily supplements of potentially prebiotic isomalto-oligosaccharides may improve bowel habits in elderly people susceptible to constipation, says a new study from Taiwan.
A daily dose of 10 grams of the isomalto-oligosaccharides was associated with improvements in the microflora profile in the colon, as well as improvements in blood cholesterol levels, according to findings published in Nutrition.
Researchers from the Chung Shan Medical University hypothesized that the benefits were linked to stimulated growth of bifidobacteria in the colon.
If additional studies support these findings it may see isomalto-oligosaccharides established as prebiotics – ingredients defined as “non-digestible (by the host) food ingredients that have a beneficial effect through their selective metabolism in the intestinal tract” (Gibson et al. 2004).
Sources
“Isomalto-oligosaccharides (IO), such as isomaltose, panose, isomaltotriose, and isomaltotetraose, naturally exist in Japanese fermented foods such as miso, soy sauce, and sako and are commercially produced from corn starch to be a functional food ingredient,” explained the researchers.
The ingredient used in this study was supplied by Taiwan’s Tamaru Enterprise Company.
Study details
The Taiwanese researchers recruited 13 constipated elderly subjects with an average age of 82.5 and randomly assigned them to receive either the daily isomalto-oligosaccharide supplements (10 grams per day) or placebo (fructose) for eight weeks.
Data showed that levels of bifidobacteria, lactobacilli, and bacteroides in the feces increased significantly increased in the isomalto-oligosaccharide group, while clostridia levels decreased, after four weeks.
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After the full eight weeks, the “effects were more pronounced”, said the researchers. The frequency of spontaneous defecation was also observed to increase, from an average of 1.2 events per week at the start of the study, to 2.0 after eight weeks of supplementation.
The mass of the feces also increased by 24 percent after the supplementation period, added the researchers. However, the after stopping the supplements bowel function declined, they said.
The isomalto-oligosaccharide supplements were also associated with improvements in blood levels of total and LDL cholesterol, compared with placebo. Specifically, total cholesterol levels decreased from 4.1 mmol/L at the start of the study to 3.6 mmol/L at the end, while LDL levels fell from 2.4 to 2.1 mmol/L, reported the researchers.
Safety profile
“The current study extended the feeding period to two months and found the bodyweight, plasma albumin, glucose, triglyceride, urea nitrogen, creatinine, and ALT levels did not change among periods,” wrote the researchers.
“No adverse abdominal symptoms were reported either. Therefore, this study suggests its safety for use in the elderly,” they concluded.
日期：2010-07-21
