Publication: Variation of Nutrients and Functional Properties within Young Shoots of a Bamboo Species (Yushania alpina) Growing at Mt. Elgon Region in Western Kenya
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2015
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NACOSTI
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Science and Education Publishing
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Abstract
Yushania alpina is an indigenous bamboo species growing at Mt. Elgon forest in Western Kenya and its
young shoots are consumed by the local people as a vegetable. This study was done to determine some physicochemical properties and their distribution within the shoot. Each shoot was divided into the upper and lower portions
which were analyzed separately, and results were expressed in dry weight basis. On proximate composition, there
was no significant difference (p<0.05) between the two portions in terms of moisture, protein, ash and fat content,
which ranged 92.2-92.4% fresh weight, 33.0-33.4% dry weight basis (dwb), 17.0-17.1% dwb and 2.0% dwb,
respectively. Significant difference was found in fiber and carbohydrates, whose content was 23.9 and 23.6% dwb in
the upper portion compared to 30.7 and 17.3% dwb in the lower part, respectively. The upper portion contained Ca
of 2,670, Mg of 4,300, K of 35,900 and P of 7,630 µg/g dwb, whereas the lower portion had Ca of 1,060, Mg of
1,270, K of 27,600 and P of 4,810 µg/g dwb. The upper portion was found to contain thiamine, riboflavin and
vitamin C of 2.2, 8.4 and 78.2 µg/g dwb, respectively, whereas the lower part contained 1.8, 7.3 and 51.2 µg/g dwb,
respectively. Fructose was found to differ significantly with the upper portion having 2.19 % against 0.62 % in the
lower portion. Total polyphenol and flavonoid content of 27.6 and 24.6 mg/g dwb, respectively, were observed in
the upper part compared to 25.9 and 20.1 mg/g dwb, respectively in the lower part. The upper portion was observed
to exhibit better antioxidant activity with LC50 of 1 mg/ml compared to 5 mg/ml for the lower part, and higher
Hunter’s L* value.
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Keywords
Yushania alpina, bamboo, nutrients’ distribution, minerals, polyphenol, flavonoids, antioxidant activity
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https://repository.nrf.go.ke/handle/123456789/1011
https://repository.nrf.go.ke/handle/123456789/1011