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Table 2 Compositions of refined glycerol and crude glycerol

From: Medium chain length polyhydroxyalkanoates consisting primarily of unsaturated 3-hydroxy-5-cis-dodecanoate synthesized by newly isolated bacteria using crude glycerol

Analysis

Result

Analytical methods

Refined glycerol

 Glycerol content

99.5 wt % Min

A.O.C.S. Ea 7–50

 Specific gravity

1.26 Min

A.O.C.S. Ea 7–50

 Color (APHA)

10 Max

Lovibond

 Heavy metal

5 ppm Max

BS 5711: Part 15

 Water content

0.5 wt % Max

Karl fisher

 Combustibles

0.01 wt % Max

USP-30

 Arsenic

1.5 ppm Max

BS 5711: Part 10

 Diethylene glycol

0.1 wt % Max

USP-30

 Sulfate

0.002 wt % Max

USP-30

 Iron

10 ppm Max

USP-31

Crude glycerol

 Total organic carbon

300.9 g/L

Total organic carbon analyzer

 Glycerol content

50.2 wt %

HPLC

 Methanol content

12.0 wt %

GC

 Organic fraction

38.4 wt %

GC

 Lauric acid (C12:0)

1.0 wt %

GC

 Palmitic acid (C16:0)

5.4 wt %

GC

 Stearic acid (C18:0)

0.6 wt %

GC

 Oleic acid (C18:1)

11.9 wt %

GC

 Linoleic acid (C18:2)

17.7 wt %

GC

 Linolenic acid (C18:3)

1.8 wt %

GC