期刊名称：Advance Journal of Food Science and Technology
印刷版ISSN：2042-4868
电子版ISSN：2042-4876
出版年度：2010
卷号：2
期号：3
页码：159-162
出版社：MAXWELL Science Publication
摘要：Analysis of the nutritional composition of fruits of three species of Grewia ( G. tenax , G. flavescens and G. villosa ) were carried out. The proximate composition as well as the content of amino acids, mineral elements (K, Ca, Mn, Fe, Cu and Zn), tannin and pectic substances was determined. The results, which referred to (%) dry weight, showed that G. tenax , G. flavescence and G. villosa contained 13, 15 and 14% moisture; 20.5, 42.8 and 25.5% crude fibre; 5.2, 3.4 and 4.0% ash and 66, 75 and 84% carbohydrates, respectively. G. tenax had the highest value of reducing sugar (13.8 %) and starch content (44.4%). The three species contained low amount of protein and fats, which ranged from 6.7% ( G. villosa ) to 8.7% ( G. flavescens ) and 1.30% ( G. flavescens ) to 1.7% ( G. tenax ) respectively. They all had similar distribution of amino acids but in varying amounts. The essential amino acids detected in G. tenax fulfil the requirements of the FAO/WHO 'standard protein'. The predominant mineral in the three species was potassium, which ranged from 817 mg/100 g ( G. tenax ) to 966 mg/100 g ( G. villosa ). The three Grewia spp contained remarkably high amounts of iron with values ranged from 20.8 mg/100 g ( G. tenax ) to 29.6 mg/100 g ( G. villosa ). This finding supports the traditional use of Grewia spp in the treatment of anaemia. Tannin content was low and ranged from 1.13% ( G. flavescens ) to 2.46% ( G. villosa ). Pectic substances content was higher in G. tenax (13.02%) and G. villosa (11.72%) than in G. flavescens (6.26%). The results of this study provide evidence that these local traditional fruits could be important contributors to improving the nutritional content of rural and urban people.
关键词：Amino acids ; G. tenax (Forsk.) Fiori ; G. villosa Willd ; Grewia flavescens Juss ; mineral ; pectic substances ; proximate
