Techniques for Determining Alcohol Levels in Wine and Mulled Wine

Sammanfattning: The aim of this study is to in cooperation with Grythyttan Vin compare and evaluate the accuracy and precision of the Alcolyzer Wine. The Alcolyzer Wine is a Near Infrared based instrument that was compared to GC-FID, GC-MS and distillation. Samples were taken from cisterns at Grythyttan Vin along with finished product samples. These were then analysed using the mentioned analytical techniques. Multiple improvements can be made for the different techniques, such as use of internal standards. The relative standard deviations are higher than desired. Considering aspects such as precision, accuracy, cost, time consumption and user friendliness the preferred method of use is the Alcolyzer Wine. Even though it has limitations in the need to know sugar content it is the fastest and easiest instrument to use. Further studies have to be made to ensure the accuracy and precision of the GC-MS and the GC-FID.