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Articles by Supradip Saha
Total Records ( 3 ) for Supradip Saha
  Supradip Saha , N. K. Hedau , S. Kumar , V. Mahajan and H. S. Gupta
  Screening of natural biodiversity for the variation in quality traits is of prime importance for quality-breeding programmes. The objective of this investigation was to select candidate accession of hot pepper having high concentrations of ascorbic acid, capsaicin, β-carotene, and total phenols for use as parents in breeding for these compounds. Forty-two accessions of pepper (Capsicum annuum) were field grown and their mature fruits were analysed for their functional and nutritional composition. Wide variations were observed in most of the measurements, e.g. ascorbic acid (25-217mg per 100g), total phenolics (38.4-188.1mg per 100g catechol eq.), and capsaicin (0.08-0.67%), suggesting that there are considerable levels of genetic diversity. Across all accessions the concentration of ascorbic acid was negatively correlated with that of β-carotene (r=-0.33, p <0.05). Concentrations of L-ascorbic acid were significantly greater in VLC 22-I-2-1, VLC-29-II-1-1, VLC-30-I-1, and Janjeera Mirch compared with other accessions analysed. Total capsaicin concentrations were greatest (0.67%) in VLC-30-II-1 and lowest (0.08%) in VLC-32-3. Four factors were computed by principal-component analysis to explain 67% of the variation in the traits. The great variability for these phytochemicals suggests that these selected accessions may be useful as parents in breeding programmes to produce fruits with value-added traits.
  Supradip Saha and Gita Kulshrestha
  The kinetics of hydrolytic degradation of Sulfosulfuron was investigated to predict the fate of the herbicide in an aqueous environment. The study revealed that the hydrolytic degradation of Sulfosulfuron followed first-order kinetics. The degradation of the herbicide was dependent on pH and temperature. Hydrolysis rate was faster in acidic condition (t1/2 = 9.24 d at pH 4.0) than alkaline environment (t1/2 = 14.14 d at pH 9.2). Several fold increase in the degradation rate was found when temperature was increased from 10 ± 1°C (t1/2 = 518 h) to 50 ± 1°C (t1/2 = 10 h). Activation energy (Ea) was also calculated as 63.87 KJ mol-1, which is required for the hydrolytic degradation of the molecule. Both media pH and temperature effects were coupled together and derived a complex equation to estimate the overall effect of these two abiotic factors. The major degradation mechanism of the compound was the breaking of the sulfonylurea bridge yielding corresponding sulfonamide and aminopyrimidine. The possible significance of the results to persistence of the herbicide in the field condition is discussed.
  Aditi Kundu and Supradip Saha
  We investigated the antifungal potentiality of multifunctional novel picolinamide derivatives against various phytopathogens. Picolinic acid is a microbial secondary metabolite reported to possess wide biological potential. Picolonic acid was esterified, condensed with hydrazine hydrate and subsequent refluxing with various substituted aromatic aldehydes to synthesize sixteen novel substituted picolinamides. Synthesized novel compounds were characterized by various physico-spectral techniques. Structure antifungal activity relationship of the synthesized molecules was predicted by evaluating individual derivatives. Picolinamide derivatives were found to possess significant antifungal activity against the wide range of soil borne pathogens. Chloro substituted picolinamide derivatives exhibited maximum antifungal activity against R. solani (ED50 29.08 μg mL-1) followed by A. alternata (ED50 33.90 μg mL-1). Antifungal bioassay results testify that these compounds can be of interest in search for new fungicides.
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