• The Korean Journal of Food And Nutrition
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• v.22 no.2
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• pp.223-228
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• 2009

The principal objective of this study was to determine the available components in different varieties of Discorea spp. The Discorea spp. samples were divided into three groups by variety. The three groups were divided into Jangma(D. batatas Decaisne), Danma(D. japonica Decaisne), and Doonggunma(D. opposita Thumb), and then assessed with regard to the content of proximate compositions, minerals, sugars, crude saponin, and diosgenin. No substantial differences were noted to exist among samples in terms of carbohydrate and crude protein contents. The crude lipid contents were detected in the following order : Danma(D. japonica Decaisne, $0.71{\pm}0.15%$) > Jangma(D. batatas Decaisne, $0.65{\pm}10.12%$) > Doonggunma (D. opposita Thumb, $0.49{\pm}0.10%$). The Danma(D. japonica Decaisne) samples were determined to harbor the highest K($2.07{\pm}0.91%$), Ca($0.21{\pm}0.12%$), Fe($110.7{\pm}0.0$ mg/kg), Mn($20.6{\pm}3.4$ mg/kg) and Zn($31.2{\pm}3.9$ mg/kg) contents among all tested samples. The predominant sugar components in all samples were mannose($70.7{\pm}1.3{\sim}80.5{\pm}1.5%$), glucose($18.2{\pm}1.2{\sim}28.3{\pm}2.5%$) and sucrose($60.3{\pm}3.7{\sim}83.6{\pm}6.5%$). The crude saponin and diosgenin contents for Jangma(D. batatas Decaisne), Danma(D. japonica Decaisne) and Doonggunma(D. opposita Thumb) varieties were : $1.7{\pm}0.4%$, $3.9{\pm}0.8%$ and $3.2{\pm}0.7%$, and $13.59{\pm}1.74$ mg/g, $14.25{\pm}1.60$ mg/g and $18.00{\pm}1.92$ mg/g, respectively.

• Korean Journal of Plant Resources
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• v.25 no.2
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• pp.200-208
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• 2012

The bulbil of the $Dioscorea$ $species$ is produced, the amount of which is 2,000 tons annually, but it has been discarded without specific use. In this study the antioxidant and antimutagenicity of bulbil of the $Dioscorea$, which compared to bulbil of Danma($Dioscorea$ $japonica$ Decaisne) and Jangma($Dioscorea$ $batatas$ Decaisne), a major domestic cultivation species. The study was done by extracting bulbil of the Dioscorea methanol and the methanol extracts was re-extracted with chloroform, ethyl acetate, $n$-butanol and water. In methanol extract of Danma and Jangma, polyphenolic compounds contained 2.2 and 3.9 mg/g extract, respectively. The ethyl acetate fraction of Danma and Jangma had higher polyphenolic contents of 33.9 and 39.1 mg/g, whereas water fractions were much lower at 2.4 and 5.8 mg/g. Determination of antioxidant activity showed that the ethylacetate fraction strong DPPH radical scavenging activity and ABTS radical scavenging activity. The inhibitory effects of methanol extracts and chloroform, ethylacetate, $n$-butanol, water fraction from bulbil of Danma and Jangma on the mutagenicity in 1-NP, $AFB_1$, Trp-P-1 were investigated using $S.$ $typhimurium$ TA98. Danma and Jangma cultivars decreased the reverse mutation induced by 1-NP, $AFB_1$, Trp-P-1 in $S.$ $typhimurium$ TA98. The fraction of chloroform and ethylacetate showed strong inhibitory effects, in a dose dependant manner against the mutagenicities induced by 1-NP, $AFB_1$, Trp-P-1 in $S.$ $typhimurium$ TA98.