Calcium analysis of calcium fortified milk is difficult due to high concentration of calcium and interfering elements phosphates and citrates. The International methods were analyzed but accuracy was low. Therefore, the calcium analysis method for milk and milk products using flame absorption atomic spectroscopy was standardized. The atomic absorption spectrometer was calibrated, and true values ranged between 99.90 to 101.13%. The initial calibration verification values were 100.09 to 100.52% which showed that equipment analysis accuracy is perfect. The wet and dry digestion methods were used for sample preparation. Spike and duplicate sample analysis were used to select the best digestion method. Dry digestion for 16 h at 600 °C showed the best sample preparation method for analysis of calcium. Lanthanum oxide and lanthanum chloride were used for minimizing chemical interference. It was observed that lanthanum chloride (0.05% w/v) gave better results for calcium analysis. The calcium content ranged between 4506 ppm to 5823 ppm for market paneer samples and 5735 ppm to 7773 ppm for market khoa samples, respectively.
Citation: Kaushik R, Arora S. 2023. Standardization of Atomic Absorption Spectrometry Protocol for Calcium Analysis in Milk and Milk Products. J Food Chem Nanotechnol 9(1): 36-42.