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. 2015 Sep 3;29(1):80–88. doi: 10.5713/ajas.15.0219

Table 2.

Chemical composition of crude glycerin used in this experiment 1, 2

Items Content Analytical method
Total glycerin (%) 88.91 ASTM D 6584-00E01, titration assay (AOAC, 1995)
Moisture (%) 5.60 AOAC3 method 984.20
DM (%) 94.40 Determined by difference
Methanol4 (%) 0.52 Gas chromatography
Ash4 (%) 3.51 AOAC method 942.05
Sodium4 (%) 2.24 AOAC methods 956.01, 9.15.01
Sulfur4 (%) 0.10 AOAC method 956.01
Free fatty acid4 (%) 0.09 AOAC method Ca 5a-40
Crude protein4 (%) 0.01 AOAC method 990.03
Gross energy (kcal/kg) 3,961 Adiabatic bomb calorimeter
1

Crude glycerin was obtained from New Biodiesel Co., Ltd., Surat Thani Province.

2

Analysis by Central Laboratories (Songkhla, SK), Co., Ltd., Songkhla 90110, Thailand.

4

Expressed as a percentage of crude glycerin DM.