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| Articles
by
M. Mosihuzzaman |
Total Records (
2 ) for
M. Mosihuzzaman |
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S. Islam
,
M.S. Hossain
,
N. Nahar
,
M. Mosihuzzaman
and
M.I.R. Mamun
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A reverse phase high performance liquid chromatographic
method with an acetonitrile-water mobile phase gradient and UV/Visible
detection is described for the determination of three pesticides, frequently
used in agriculture, in eggplant samples. The samples were sprayed with
three pesticides namely, Diazinon, Malathion, Sumithion at three different
doses and were harvested at two different Pre-Harvest Interval (PHI) of
days 1 and 5 after the application of the pesticides. Sample preparation
involved extraction with ethyl acetate and clean up was accomplished by
solid-phase extraction using florisil columns. Calibration curves that
were constructed for the analytes with matrix matching followed linear
relationships with good correlation coefficients (R2>0.990).
The average recoveries of the pesticides which were sensitive to matrix
effects ranged from 88-120%. Detection limit of less than 0.02 mg kg-1
showed that the method developed can be used to determine the pesticide
residues in concentrations lower than the maximum residue limits. In the
analysis of residues, samples treated with Diazinon at all doses, residual
amounts above Maximum Residue Limit (MRL) (0.02 mg kg-1) were
found. Malathion and Sumithion were found above MRL (0.5 mg kg-1)
value in only one sample for each pesticide. |
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Nasim Sultana
,
Kaisarun Akter
,
Nilufar Nahar
,
M. Shahinul Hoque Khan
,
M. Mosihuzzaman
,
Md Hossain Sohrab
and
Karsten Krohn
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Three novel flavonoid glycosides, 5,6-dimethyoxy-3',4''-dioxymethylene-7-O-(6''-β-D-glucopyranosyl-β-D-glucopyranosyl) flavanone (1), 5,4'-dihydroxy-3-O-α-L-rhamnopyranosyl-6-C-glucopyranosyl-7-O-(6''-para-coumaroyl-β-D-glucopyranosyl) flavone (2) and 5,4'-dihydroxy-3-O-(2'''''-β-glucopyranosyl-α-L-rhamnopyranosyl)-6-C-glucopyranosyl-7-O-(6''-para-coumaroyl-β-D-glucopyranosyl) flavone (3) were isolated from the 1-butanol soluble fraction of the bulbs of the plant Urginea indica (Indian squill). The structures of the compounds were elucidated on the basis of spectral analysis, including homo- and heteronuclear correlation NMR experiments (COSY, NOESY, HSQC and HMBC) and mass spectra. |
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