2026, Vol. 7, Issue 1, Part A

Vitamin C (ascorbic acid) is an essential biological compound with significant antioxidant properties, widely used in the food and pharmaceutical industries. In this study, the chemical structure and integrity of vitamin C were investigated by FTIR spectroscopy. FTIR analysis allowed the identification of characteristic functional groups, including hydroxyl (-OH) and carbonyl (C=O) groups, through specific signals in the infrared spectrum. The results revealed characteristic vibrations in the regions 3200–3600 cm⁻¹ for O–H bonds and around 1750 cm⁻¹ for C=O bonds, confirming the identity and purity of the sample. The study demonstrates that FTIR is a rapid, non-destructive and efficient method for the structural and qualitative analysis of vitamin C, providing valuable information for quality control and research of food and pharmaceutical products. Vitamin C contains the following functional groups: O-H, C=O, C-H and C-C.