UV Spectrophotometric Method For The Estimation of Seratrodast in Bulk and Pharmaceutical Dosage Form

A simple, specific, accurate and precise U.V Spectroscopy method was developed and validated for the estimation of Seratrodast in pharmaceutical dosage forms. The stock solution was prepared by weighing 100 mg of Standard Seratrodast in 100ml volumetric flask containing distilled water. The final stock solution was made to produce 100

Development of catalyst complexes for upgrading biomass into ester-based biolubricants for automotive applications: a review

Biomass-derived oils are recognised as the most promising renewable resources for the production of ester-based biolubricants due to their biodegradable, non-toxic and metal adhering properties. Homogeneous acid catalysts have been conventionally used in catalytic esterification and transesterification for the synthesis of ester-based biolubricants. Although homogeneous acid catalysts encounter difficulty during phase separation, they exhibit superior selectivity and good stereochemistry and regiochemistry control in the reaction. Consequently, transition metal complex catalysts (also known as homogeneous organometallic catalysts) are proposed for biolubricant synthesis in order to achieve a higher selectivity and conversion. Herein, the potential of both homogeneous transition metal complexes and heterogeneous supported metal complexes towards the synthesis of biolubricants, particularly, in esterification and transesterification, as well as the upgrading process, including hydrogenation and in situ hydrogenation–esterification, is critically reviewed

Eco-Friendly Multipurpose Lubricating Greases from Vegetable Residual Oils

Environmentally friendly multipurpose grease formulation has been synthesized by using Jatropha vegetable residual oil with lithium soap and multifunctional additive. The thus obtained formulation was evaluated for its tribological performance on a four-ball tribo-tester. The anti-friction and anti-wear performance characteristics were evaluated using standard test methods. The biodegradability and toxicity of the base oil was assessed. The results indicate that the synthesized residual oil grease formulation shows superior tribological performance when compared to the commercial grease. On the basis of physico-chemical characterization and tribological performance the vegetable residual oil was found to have good potential for use as biodegradable multipurpose lubricating grease. In addition, the base oils are biodegradable and non toxic

An Efficient Catalyst for Esterification of Biodegradable Polyol Ester Lubricants

Increasing environmental awareness and regulations have accelerated the developmental activity of rapid biodegradable lubricants in some part of the globe in last few years. Biodegradable products carry a significant price premium over conventional mineral oils. Ester based products are generally compatible with most construction materials, and also used as environmentally acceptable t1uids in high performance lubricants. Polyol esters are gaining importance because of their inherent good oxidation, better thern;tal stability and low volatility prop~rties as compared to mineral oils. Coupled with their higher t1ash point and auto-ignition temperature; low order of toxicity for vapor inhalation, ingestion and skin irritation along with high biodegradability, these are safe for lubricant formulations with lesser impact on environment. Ion exchange resins are found to be efficient catalyst for the synthesis of various types of biodegradable/ecofriendly esters. The physicio-chemical properties of the esters synthesized from 2,2-dimethyll,3-propane diol, 2,2-diethyll,3-propane diol,l,l,l-tris hydroxy methyl propane and C5-C10 dicarboxylic acids with mono alcohol have been determined to evaluate their suitability as synthetic lubricating oil base stocks. The paper highlights the results of these complex esters