• Applied Biological Chemistry
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• v.47 no.1
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• pp.130-134
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• 2004

The arils of Euphoria longana L. was extracted with 80% aqueous MeOH, and the concentrated extract was partitioned with EtOAc, n-BuOH and $H_2O$. From the n-BuOH fraction, four compounds were isolated through the repeated silica gel, ODS and Sephadex LH-20 column chromatographies. From the result of physico-chemical data including NMR, MS and IR, the chemical structures of the compounds were determined as 1,1-dimethyl-2propenyl $1-O-{\beta}-D-glucopyranoside$, ethyl ,${\beta}-D-glucopyranoside$, 5-(hydroxymethyl)-2-furfur-aldehyde and uridine. Uridine exhibited inhibition effect of 79% on platelet aggregation at the concentration of$5\;{\mu}g/ml$.

• Journal of Applied Biological Chemistry
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• v.48 no.1
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• pp.32-34
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• 2005

Arils of Euporia longana L. was extracted with 80% aqueous MeOH and partitioned successively with EtOAc, n-BuOH and $H_2O$. From the n-BuOH fraction, furan compound was isolated through silica gel column chromatography. The results of physico-chemical data including NMR, MS and IR revealed the compound to be 5-(hydroxymethyl)-2-furfuraldehyde. This compound stimulated GDH I activity by $19.2{\pm}0.6$, $41.2{\pm}0.9$, $68.4{\pm}1.1$, $80.3{\pm}0.9$ and $85.9{\pm}1.6%$ at in vitro concentrations of 0.005, 0.008, 0.02 and 0.03 %, respectively.

• Food Science and Preservation
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• v.14 no.5
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• pp.531-537
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• 2007

Antioxidant anticancer activities and nitric oxide (NO) production of Vietnamese and Thai yonganyook (Euphoria longana) fermented with lactic acid bacteria and Bacillus subtilis were investigated. Total organic acid contents (TAC) of Thai raw yonganyook (473.49 mg/g, 89.2% of TAC) were higher 3.2 tims than those of Vietnamese raw yonganyook (148.48 mg/g, 86.8% of TAC) and major organic acids of two materials were formic acid and malic acid. Total free sugars contents of Vietnamese raw yonganyook (434.63 mg/g) were higher 1.2 times than those of Thai raw yonganyook (378.77 mg/g) and major free sugar of two materials welt sucrose, glucose and fructose. NO production of RAW264.7 cell treated with methanol extract of Vietnamese fermented yonganyook was shown to be a lower level than that of Thai fermented yonganyook. It's production by fermented yonganyook was strongly exhibited in low dose (0.2 mg/mL) than in high dose (1.0 mg/mL) as compared with raw yonganyook Electron-donating ability (EDA) of Vietnamese raw yonganyook ($41.72{\pm}3.59%$) at $600\;{\mu}g/assay$ was higher 1.4 times than that of Thai yonganyook ($30.20{\pm}4.8%$). EDA of Vietnamese yonganyook fermented with B. subtilis at $600\;{\mu}g/assay$ was $43.57{\pm}2.07%$ which was the highest level of all samples tested. Anticancer activity of raw yonganyook on human HeLa cell was similar to between Vietnamese and Thai yonganyook. In inhibitory effect of HepG2 cell growth, methanol extract of Thai yonganyook ($46.13{\pm}4.80%$) was higher than that of Vietnamese yonganyook ($33.07{\pm}0.92%$). Inhibitory activity of fermented yonganyook on HeLa and HepG2 cell growth were $39.21{\pm}1.46%$ and $48.07{\pm}1.63%$ when $200\;{\mu}g/assay$ of methanol extract of Vietnamese and Thai yonganyook fermented with B. subtilis were used, respectively.