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Your search keyword '"Amjad Gilani, Mazhar"' showing total 15 results
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15 results on '"Amjad Gilani, Mazhar"'

14. Enzyme-assisted Extraction for Optimized Recovery of Phenolic Bioactives from Peganum hermala Leaves Using Response Surface Methodology

Author

Anwar Farooq, Ahmad Mukhtar, Amjad Gilani Mazhar, Qadir Rahman, and Nadeem Yaqoob Muhammad

Subjects
chemistry.chemical_classification, Nutrition and Dietetics, Enzyme, Chromatography, chemistry, biology, Extraction (chemistry), Medicine (miscellaneous), Response surface methodology, Peganum, biology.organism_classification
Abstract

This study investigates the effect of enzyme formulations (Zympex-014, Kemzyme dry-plus and Natuzyme) on recovery of phenolics from Peganum hermala (harmal) leaves, under optimized conditions using response surface methodology. As compared to the other enzyme complexes, the yield (34 g/100g) obtained through Zympex-014-assisted extraction was higher under optimized conditions such as time (75 min), temperature (70°C), pH (6.5) and enzyme concentration (5 g/100 g) using central composite design (CCD). Effectiveness of Zympex-014 towards hydrolysis of P. hermala leaves cell wall was examined by analyzing the control and enzyme-treated leave residues using scanning electron microscope (SEM). GC/MS characterization authenticated the presence of quercetin (1.44), gallic acid (0.23), caffeic acid (0.04), cinnamic acid (0.05), m-coumaric acid (0.23) and p-coumaric acid (0.37 μg/g) as the potent phenolics in Zympex-014 based extract. It can be concluded from the findings of the current work that pre-treatment of P. hermala leaves with Zympex-014 significantly enhanced the recovery of phenolics that supports its potential uses in the nutra-pharamaceutical industry.

Published
2018
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15. Chiral Imidazolinium Salts with TIPS Groups for the Palladium-Catalyzed α-Arylation and as Chiral Solvating Agents.

Author

Amjad Gilani, Mazhar, Rais, Eduard, and Wilhelm, René

Subjects
*PALLADIUM catalysts, *ARYLATION, *CATALYSIS, *AMIDES, *CARBENES, *CHEMICAL synthesis
Abstract

The synthesis of imidazolinium salts from low-cost amino alcohols incorporating different sterically demanding silyl groups is described. The new salts were analyzed and investigated as carbene precursors in a palladium-catalyzed asymmetric intramolecular a-arylation of an amide. The easily accessible carbene precursors gave enantiomeric excesses of up to 72% with nearly quantitative yields. The salts were also successfully applied as chiral solvating agents with the potassium salt of Mosher's carboxylate and can therefore contribute to the field of chiral recognition. [ABSTRACT FROM AUTHOR]

Published
2015
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