Natrium carboxymethyl cellulose (Na-CMC) is a cellulose derivative that is produced commercially in greater amounts than other cellulose derivatives. Natrium carboxymethyl cellulose (Na-CMC) is a linear cellulose polymer and is an anion compound that is biodegradable, odourless, colourless, non-toxic, tasteless, flexible and transparent. Natrium carboxymethyl cellulose (Na-CMC) is usually found in the form of granules or powders which are soluble in water but cannot dissolve in organic solutions. Natrium carboxymethyl cellulose (Na-CMC) has a pH range of 6.5-8 and is stable in a pH range of 2-10. Na-CMC is found in several types of plants, such as water hyacinth, durian, elephant grass, rice, peanuts, pineapple, corn, oranges, baobab and sugar cane. Na-CMC is obtained from these plants. Na-CMC is widely used in the pharmaceutical, cosmetic, food, paper, textile, lithography and tobacco industries. Na-CMC sourced from natural materials is characterized by Fourier Transform Infrared Spectroscopy (FTIR). The functional groups of cellulose and carboxymethyl cellulose were investigated using infrared spectroscopy spectra. The pellets were made with CMC with potassium bromide (KBr). The absorbance level was measured for the wave number 3800-400 cm-1. The results of the extraction of cellulose and carboxymethyl cellulose were characterized using the Fourier Transform IR (FTIR) instrument. To obtain the spectrum, the pellets made from the sample were grounded with KBr. Transmission was measured in the wave number range 4000-4400cm-1. Infrared spectroscopy is one of the most versatile techniques used in chemistry and certainly one of the most important analytical methods available. It is a versatile experimental technique and it is relatively easy to obtain a reliable spectrum from a sample in almost any situation. In general, the infrared spectrum is used to determine the functional group of an organic compound and to find out the structural information of an organic compound.