Validation of a simple, rapid and cost effective method for the estimation of caprylic acid and sodium caprylate from biological products using NEFA-C kit

The method for the determination of caprylic acid and sodium caprylate from biological products was systematically validated using NEFA-C kit. The results obtained demonstrated that the kit method was simple, rapid, reliable, sensitive, reproducible and cost effective in comparison to the current methods i.e. colorimetric, High Performance Liquid Chromatography (HPLC) and Gas Chromatography (GC) methods. The assay exhibited excellent linearity, accuracy, precision and robustness. Mean recoveries ranged between 95 and 101.3% (n = 6). The proposed method was linear over the concentration range of 0.05–10 mM of caprylate with values of coefficient of regression being >0.99. Method showed sensitivity of 0.05 mM (7.21 μg/ml for caprylic acid and 8.31 μg/ml for sodium caprylate). The % Relative standard Deviation (%RSD) for intra and interprecision studies was less than 5%. In conclusion the validated method was successfully used in monitoring of processed bulk and final products generated during production of biological products thus laying emphasis on strict control of release criteria for biological products fractionated using caprylic acid.