Several methods are used for the analysis of vitamins, depending on the specific vitamin being studied and the matrix in which it is present. Some common methods include: HPLC (High-Performance Liquid Chromatography): HPLC is widely used for the analysis of various vitamins due to its high sensitivity and selectivity. It involves separating the individual components of a sample based on their interaction with a stationary phase and a mobile phase. UV detection is commonly used for vitamins like B-group vitamins and vitamin C, while fluorescence detection may be used for vitamins like riboflavin and vitamin B12. GC (Gas Chromatography): GC is commonly used for the analysis of fat-soluble vitamins, such as vitamins A, D, E, and K, as well as some volatile vitamins like vitamin B6. In GC, the sample is vaporized and carried through a column by an inert gas, separating the components based on their volatility and interaction with the column material. LC-MS (Liquid Chromatography...