APPLICABILITY OF AAS, UV-VIS, GC-MS AND FT IR METHODS FOR THE ANALYSIS OF MYANMAR COFFEE PRODUCTS
Abstract
- Spectroscopic methods and modern techniques were applied to study the mineral composition and caffeine contents of five brands of Myanmar coffee products (Shwe Pu Zun, Nan Myaing, Suu, Premier and Mr. Coffee). Measurements of preliminary chemical composition of Myanmar coffee products such as moisture and ash were performed by conventional method. The relative abundance of elements in the coffee products was determined by EDXRF. The total contents of some minerals; (Ca, Cu, K, Zn and Fe) in solid samples were determined by means of Atomic Absorption Spectroscopy (AAS). The content of calcium in those coffee products was found to be in the ranges of 232.50 –524.40 ppm, copper (0.04 – 1.00 ppm), potassium (425.80 – 832.80 ppm), zinc (46.80 – 75.80 ppm) and iron (0.10 – 0.93 ppm) respectively. Caffeine in Myanmar coffee products were extracted by solvent extraction method. By the extraction and recrystallization processes, the weight percentages of crude caffeine in those products (Shwe Pu Zun, Nan Myaing, Suu, Premier and Mr. Coffee) were 0.3268, 0.4012, 0.8704, 0.1128 and 0.7140 %. Those crude products were purified by acetone and the pure caffeine from those products was confirmed by UV-Vis, FT IR and GC-MS.
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Year
- 2019
Author
-
Sandar Aung
Subject
- Chemistry
Publisher
- Myanmar Academy of Arts and Science (MAAS)