Results (
Thai) 1:
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Ground root sample (0.1 g) was extracted with 8ml of
methanol containing HCl and n-hexane and sonicated for
5 min in a sonicator (Sonoplus HD 200, Japan). The extract
was centrifuged at 1400 × g for 15 min at 4 ◦C. The supernatant
was then collected and evaporated under N2 until it
was dry. It was then resuspended in 300 l of methanol,
then passed through a 13 mM-pore-size cellulose nitrate
filter [40]. For the analysis of -tocopherol (Vitamin E), a
HPLC method similar to that described by Keles and Dnul
[41] was used. -Tocopherol was separated on a RP-C18
column using acetonitrile water as an eluant at a flow rate
of 0.9 ml min−1. The injection volume was 100 l, and
UV detection was carried out at 292 nm (Theremo Separation
Product, SP) for 10 min. Detection of -tocopherol
was quantified by peak area integration using data acquisition
software (ThermoQuest, ChromQuest Chromatography
Data system). The -tocopherol peak was identified
according to a standard (Sigma).
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