Prasad V.S.R.K.,Anil Neerukonda Institute of Science and Technology
Pharma Research | Year: 2011
India is the largest producer and processor of cashews (Anacardic occidental L). Cashew nut shell liquid (CNSL) is a dark brown viscous liquid present inside a soft honey comb structure of the cashew nut shell and is a byproduct obtained during the processing of cashew nuts. The present review discusses various application of CNSL as well as the applications of constituents of CNSL. Various methods of extraction of CNSL are available in the literature. They are hot-oil and roasting in which the CNSL oozes out from the shell. The traditional method of extracting CNSL is by roasting of the nuts over an open fire. This removes the CNSL by charring/degradation thereby wasting the liquid which is a valuable source of natural phenols. CNSL can properly be extracted by methods like cold extraction, hot solvent extraction using Soxlet extractior, supercritical Carbon dioxide extraction and vacuum pyrolysis. The review focuses on various methods of extraction, their merits and demerits. CNSL mainly consists of anacardic acid, cardol and cardanol in various proportions depending upon the type of extraction. This review also highlights various methods of isolation of these major constituents. The quantitative and qualitative analysis of CNSL is also presented in this review. Scope for future work is also discussed.