Standard oven drying methods vs. TGM800: Direct moisture determination

Working with grains requires a lot of thermogravimetric analyses, but standard oven drying methods were conventionally time-consuming

9 Dec 2019
Laura Sisman
Administrator / Office Personnel

LECO Africa reached out to Jolanda Nortjé, Laboratory Manager of The Southern African Grain Laboratory (SAGL), with a suggestion of a comparison of a primary moisture loss-on-drying determination using the TGM800 and standard oven drying methods.

Three types of grains were analyzed by SAGL in this comparison: whole sunflower seeds, maize meal, and flour (whole wheat and white wheat). These samples were production samples currently being analyzed by SAGL, so the results would demonstrate how applicable the TGM800 was to the actual work the laboratory was doing. The TGM800 and standard oven drying methods were performed on the same day for each type of grain to eliminate any variation from moisture loss during storage.

For the oven-drying methods, AACCI 44-15.02 Moisture in Maize Meal, ICC 110/1 Moisture in Whole Wheat Flour (2 hours), ICC 110/1 Moisture in White Wheat Flour (1.5 hours), and ISO665-2000(E) Moisture in Whole Sunflower Seeds were followed.

Depending on the flour matrix, oven times could range from 1 hour to 17. Whole grains analysis can take a full 72 hours.


The SAGL found that the differences in average moisture between manual and automated methods using the TGM800 were on average 0.06%. The TGM800 was providing the SAGL with the same results as the oven drying methods.

However, the difference came with the analysis time. For the whole sunflower seeds alone, the oven drying method took 6 hours to complete. In the TGM800, the laboratory had the results in 2 hours and 37 minutes. This was a time savings of 3 hours and 23 minutes for just two samples.

After the comparison concluded, Nortjé is budgeting to purchase the TGM800 for her lab. Not only was she pleased with the reliability of the LECO instruments she's used in the past, but she also values our after-sales service and support.

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