The OLCHEMIM Enzyme Immunoassay Kits are available for the detection and quantification of plant growth regulators, cytokinins and the appropriate N9- and N3-substituted derivatives, auxins and abscisic acid. The OlChemIm ELISA Kits utilise the principle of competitive binding to measure the concentration of hormone in plant extracts. The immunoassays based on OlChemIm Kits are fast, cost effective, precise, specific, sensitive and easy to perform. In little over 3 hours total time, the plant growth regulators can be measured at 0.01 to 50 pmol/50 mL using only 50 mL of partially purified plant extracts. The Kits are cheaper than other immunoassays and suitable for a large number of samples.