THE OPTICAL CHARACTERISTIC PROPERTIES OF YAKULT DRINK USING UV / VIS SPECTROPHOTOMETER AND FTIR

• Main Author: SITORUS (NIM : 90216002), RIZQA
• Format: Theses
• Language: Indonesia
• Subjects: Fisika
• Online Access: https://digilib.itb.ac.id/gdl/view/30631
• Institution: Institut Teknologi Bandung

This research aims to qualitatively observe the light absorption response from Yakult to several spectra of electromagnetic waves. This absorption response will later be associated with Yakult's physical properties. The observation is carried out with different techniques depending on the tools used. For observation in the infrared region, Bruker ATR Alpha FTIR Spectrometer was used. While The observations in the UV and visible light area were used Thermo Scientific Evolution 220 UV-Visible Spectrophotometer with Diffuse transmittance technique. The recording time was done until there is a change in Yakult's absorption. Furthermore, additional recordings from expired Yakult. The measurement results obtained were in the form of the transmittance spectrum of the wavelength. Measurements in the infrared region showed some yakult content such as protein at ~ 6123 nm and lactose at ~ 9532 nm, in the UV region was associated with the reduction amount of protein while visible light region was associated with changes in the constituent particles of Yakult along with changes in pH. All observations refer to the literature. The results of this observation certainly do not represent all the contents of Yakult but they can be used as a reference to find out the safe time in consuming Yakult. This observation can be used not only on Yakult but also similar drinks that have milk content.