The controlled release profile showed that these biodegradable PLGA/antimicrobial nanoparticles have great potential and should be given particular consideration in antimicrobial delivery systems. The antimicrobial activity of these nanoparticles was evaluated against gram positive and negative bacteria with MICs ranging

from 182 to 374 μg/mL, that is less than previously reported for free-form of them.15 Antimicrobial results showed that such nanoparticles are remarkably more effective for inhibiting growth of gram-positive bacteria. All authors have none to declare. “
“Parthenium hysterophorus also known as congress grass, belonging to family Asteraceae is an annual herb grows upto Y-27632 purchase 1.5 m in height and short lived. The seed production of a mature plant will be around 15,000–25,000. This plant was accidentally introduced in India during the transportation of cereal and it spreads easily by means of wind. It is toxic to both humans and animals causing allergy. Some time the reaction may be GSK1349572 molecular weight immediate or may be some time delayed. Inspite of its toxic nature, it is essential to study the ability of P. hysterophorus in tolerating pollution as they acts as a sink. Among the various pollutants present in nature, ozone and sulfur dioxide are the major causative factor in free radical formation in plants.

As plants are huge reservoir of natural antioxidants, they are better alternatives for synthetic antioxidants. Antioxidants are more diversified in plants and not easy to quantify individually. Flavonoid is an antioxidant, increases under stress, thereby inhibiting the generation of reactive oxygen species

and suppressing the generated during reactive oxygen species. The plant studied were collected from Periyar University campus, Salem, Tamil Nadu which is located in Bangalore highways and the possibility of vehicular pollution will be more. Hence, an attempt has been taken to study the APTI and antioxidant system which plays an important role in protecting plants against stress, pollution as it grows more in carbon dioxide rich environment and thus increasing flavonoid content. Fresh leaves of P. hysterophorus were collected during Feb–April 2013 from Periyar University campus, Salem, Tamil Nadu, India. 100 mg of fresh leaves were taken and ground with 1 ml of water. 0.1 ml from this was used for the analysis. Air pollution tolerance index was assessed by analyzing the biochemical parameters such as pH,1 ascorbic acid,2 total chlorophyll,3 relative water content,4 total phenolic5 and flavonoid content,6 metal chelating ability,7 reducing power,8 nitric oxide radical scavenging,9 total antioxidant activity10 was performed as a measure of secondary metabolites and antioxidant activity. Gallic acid, quercetin, ascorbic acid, EDTA were used as standards. The study area Periyar University is located in NH47, Bangalore National Highways.