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Lateef M.,Bahria University | Perwaiz S.,University of Karachi | Sidduqui B.S.,University of Karachi | Azhar A.,University of Karachi | And 4 more authors.
Journal of the Chemical Society of Pakistan | Year: 2015

The current study explores the antioxidant potential of anthrarobin and its synthesized derivatives determined by various methods including DPPH radical scavenging ability, reducing power and superoxide scavenging activity. Anthrarobin was acetylated with acetic anhydride in the presence of pyridine to afford anthracen-1, 10-dihydroxy-2-acetate (1), anthracen-1-hydroxy-2, 10-diacetate (2) and anthracen-1, 2, 10-triacetate (3). Anthrarobin exhibited good antioxidant potential with 68 and 78% at 50 μM and 100 μM concentrations, respectively. Reducing power of anthrarobin increases with increase in concentration in a dose-dependent manner as could be seen from 37 and 54% activity at the concentration of 50 and 100 μM, respectively. 3-Tetra-butyl-4-hydroxyanisole (BHA) used as standard showed 84 and 93% activities at 50 and 100 μM, respectively. BHA and anthrarobin were compared to determine that how much superoxide radicals were scavenged in alkaline DMSO by different concentrations. It was found that 50 μM of anthrarobin was needed to scavenge 50% radicals while 12.5 μM of BHA scavenged 50% radicals in DMSO. It is concluded that anthrarobin has highest antioxidant potential as compared to its derivatives. It is postulated that position and numbers of hydroxyl group in anthrarobin are responsible for antioxidant potential and the activity decreases with the substitution of acyl groups at various positions in synthesized derivatives.

Hassan F.,Lahore College for Women University | Aftab T.,Lahore College for Women University | Aftab T.,Pakistan Council of Scientific and Industrial Research Complex | Shafique T.,Lahore College for Women University | And 2 more authors.
Asian Journal of Chemistry | Year: 2010

A characterization study has been conducted for the boiler water of different industries that includes rubber, paper, textile, maize products and plastic industries. The water samples were collected individually from the industries and characterized by colour, turbidity, conductivity, TDS, SS alkalinity and hardness. It is a comparative study carried out to nvestigate the quality of boiler feed water and the outlet water of the industries. The quality of feed water if poor it would effect different parts of the boiler by producing contamination like corrosion, scale and foaming which would in turn effect the quality of the chemical process taking place inside the boiler and results in great loss to the expenditure and the economy of the industry. The poor quality of outlet water depends upon the feed water used and also the type of boiler along with the chemical process taking place inside the boiler. This water if contaminated enters the streams, rivers or crops and cause water pollution.

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