B S Sekhon is currently Professor of Chemistry and Head of the Department of Biochemistry and Chemistry, Punjab Agricultural University, Ludhiana. His main research interests are in different areas of chemi-stry and biochemistry.

Manjeet K Sangha is Assistant Biochemist in the Department of Biochemistry and Chemistry, Punjab Agricultural University, Ludhiana. Her main research interests are in the areas of Enzymology and Plant Biochemistry.

Presently used detergent formulations generally consist of surfactants, builder and cobuilder, bleaching agents, additives for secondary benefits and enzymes. Zeolites are basically hydrated crystalline aluminium silicates which function as ion exchangers and make the water soft by removing calcium, magnesium and other ions. The different zeolite types A, P, X and AX and their advantages over previously used phosphate builders are described. The emphasis on compact detergents has increased the demand for zeolite builders. Enzymes in detergent formulations are stable at high pH and temperature and remove the stubborn stains of proteins and lipids by converting the larger stains into smaller water soluble fragments. Enzymatic detergent requires low workable temperature, low mechanical energy and is less toxic and non-corrosive. .

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Address for Correspondence
B S Sekhon and Manjeet K Sangha
Department of Biochemistry and Chemistry
Punjab Agricultural University Ludhiana 141 004, India