期刊
FOOD CHEMISTRY
卷 120, 期 3, 页码 850-857出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2009.11.026
关键词
Pitaya; Dragon fruit; Oligosaccharides; Prebiotic; Probiotic
资金
- Office of the National Research Council of Thailand
The major carbohydrates of white and red-flesh pitayas (dragon fruit) were glucose, fructose and some oligosaccharides (total concentrations of 86.2 and 89.6 g/kg, respectively). The molecular weight distribution of the extract was affected by the extraction solvent. The maximum oligosaccharides content (27.40%), which included fractions with molecular weights of 273-275, 448-500 and 787-911 Da, were obtained using 80% ethanol extraction at room temperature (28 +/- 2 degrees C). The low molecular weight fraction, including glucose and fructose, was successfully removed by yeast cultivation. The molecular weights of mixed oligosaccharides (716, 700, 490 and 474 Da) were confirmed by mass spectrometry. The mixed oligosaccharides showed that they were resistant to hydrolysis by artificial human gastric juice and human alpha-amylase, giving maximum hydrolysis of 4.04% and 34.88%, respectively. The mixed oligosaccharides were also found capable of stimulating the growth of lactobacilli and bifidobacteria. (C) 2009 Elsevier Ltd. All rights reserved.
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