... Mill.) ASIF SAEED 1, KHIZAR HAYAT, ASIF ALI KHAN AND SAJID IQBAL Department of Plant Breeding... more ... Mill.) ASIF SAEED 1, KHIZAR HAYAT, ASIF ALI KHAN AND SAJID IQBAL Department of Plant Breeding and Genetics, University of Agriculture, Faisalabad38040, Pakistan 1Corresponding author's e-mail: asifuaf@gmail.com ABSTRACT ... Rahman et al. ...
A variety of biscoumarins (1-21) with variable substituents at C-11 were synthesized with an impr... more A variety of biscoumarins (1-21) with variable substituents at C-11 were synthesized with an improved method and evaluated as urease inhibitors. The synthesized compounds showed varying degree of urease inhibitory activity ranging from 15.06-91.35 microM. The size and electron donating or withdrawing effects of substituents influenced the activity, which lead to the urease inhibitors.
Bulletin of Environmental Contamination and Toxicology, 2011
A simple, easy, cheap and efficient analytical method for determination of multiple pesticide res... more A simple, easy, cheap and efficient analytical method for determination of multiple pesticide residues including organochlorine, organophosphorus, synthetic pyrethroids and herbicides in rice grain by capillary gas chromatography is developed. The quantification of residues was done by capillary gas chromatography with a μ-ECD detector and a HP-5MS capillary column. Known amounts of a mixture of pesticides were added to grain prior to extraction, cleanup and GC-determination. Recoveries were checked at two fortification levels; 0.1 and 0.5 μg/g. Qualitative and quantitative analysis were carried out based on the retention time and peak area basis. The results show that the average recovery of the analytical method for the fortified rice samples was in the range of 74%-111% and %RSD in the range of 2.41–12.42. The analytical method was used to analyze commercial rice grain samples.
Bulletin of Environmental Contamination and Toxicology
The undesirable effects of green revolution include residues of extensively used pesticides in va... more The undesirable effects of green revolution include residues of extensively used pesticides in various food commodities. Several studies showed that pesticides could cause health problems. Keeping in view the problem of pesticide residues in various food commodities, the present study was conducted on domestic stored wheat as well as on imported wheat for the qualitative and quantitative analysis of organochlorine, organophosphorus and pyrethroids. Among the imported wheat, 22.5% samples were found contaminated by organophosphorus (chlorpyrifos 0.073–0.230 μg/g, malathion 0.0419–0.1003 μg/g) and pyrethroids (cypermethrin 0.1404–0.2005 μg/g, permethrin 0.0140–0.0480 μg/g) while in domestic wheat 6.7% samples were found contaminated by pyrethroids (deltamethrin 0.0650–1.2903 μg/g) only. Method used for extraction and analysis of insecticides was validated both by recovery studies and inter laboratory comparison proficiency test. The method recovery results show that the average recovery of the fortified wheat samples was in the range of 73.77%–100.17% with the RSD in the range of 2.21–9.27 whereas, the Z-scores of the inter laboratory comparison proficiency test’s result was less than 2.
HRMAS 1 H NMR is reported for the first time as a useful technique to gain insight into the dynam... more HRMAS 1 H NMR is reported for the first time as a useful technique to gain insight into the dynamic properties of aggregates present in supramolecular gels. The study of several low molecular weight gelators with this technique in toluene and acetonitrile is described.
... Mill.) ASIF SAEED 1, KHIZAR HAYAT, ASIF ALI KHAN AND SAJID IQBAL Department of Plant Breeding... more ... Mill.) ASIF SAEED 1, KHIZAR HAYAT, ASIF ALI KHAN AND SAJID IQBAL Department of Plant Breeding and Genetics, University of Agriculture, Faisalabad38040, Pakistan 1Corresponding author's e-mail: asifuaf@gmail.com ABSTRACT ... Rahman et al. ...
A variety of biscoumarins (1-21) with variable substituents at C-11 were synthesized with an impr... more A variety of biscoumarins (1-21) with variable substituents at C-11 were synthesized with an improved method and evaluated as urease inhibitors. The synthesized compounds showed varying degree of urease inhibitory activity ranging from 15.06-91.35 microM. The size and electron donating or withdrawing effects of substituents influenced the activity, which lead to the urease inhibitors.
Bulletin of Environmental Contamination and Toxicology, 2011
A simple, easy, cheap and efficient analytical method for determination of multiple pesticide res... more A simple, easy, cheap and efficient analytical method for determination of multiple pesticide residues including organochlorine, organophosphorus, synthetic pyrethroids and herbicides in rice grain by capillary gas chromatography is developed. The quantification of residues was done by capillary gas chromatography with a μ-ECD detector and a HP-5MS capillary column. Known amounts of a mixture of pesticides were added to grain prior to extraction, cleanup and GC-determination. Recoveries were checked at two fortification levels; 0.1 and 0.5 μg/g. Qualitative and quantitative analysis were carried out based on the retention time and peak area basis. The results show that the average recovery of the analytical method for the fortified rice samples was in the range of 74%-111% and %RSD in the range of 2.41–12.42. The analytical method was used to analyze commercial rice grain samples.
Bulletin of Environmental Contamination and Toxicology
The undesirable effects of green revolution include residues of extensively used pesticides in va... more The undesirable effects of green revolution include residues of extensively used pesticides in various food commodities. Several studies showed that pesticides could cause health problems. Keeping in view the problem of pesticide residues in various food commodities, the present study was conducted on domestic stored wheat as well as on imported wheat for the qualitative and quantitative analysis of organochlorine, organophosphorus and pyrethroids. Among the imported wheat, 22.5% samples were found contaminated by organophosphorus (chlorpyrifos 0.073–0.230 μg/g, malathion 0.0419–0.1003 μg/g) and pyrethroids (cypermethrin 0.1404–0.2005 μg/g, permethrin 0.0140–0.0480 μg/g) while in domestic wheat 6.7% samples were found contaminated by pyrethroids (deltamethrin 0.0650–1.2903 μg/g) only. Method used for extraction and analysis of insecticides was validated both by recovery studies and inter laboratory comparison proficiency test. The method recovery results show that the average recovery of the fortified wheat samples was in the range of 73.77%–100.17% with the RSD in the range of 2.21–9.27 whereas, the Z-scores of the inter laboratory comparison proficiency test’s result was less than 2.
HRMAS 1 H NMR is reported for the first time as a useful technique to gain insight into the dynam... more HRMAS 1 H NMR is reported for the first time as a useful technique to gain insight into the dynamic properties of aggregates present in supramolecular gels. The study of several low molecular weight gelators with this technique in toluene and acetonitrile is described.
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