Evaluation of Glycerol Profiles in Sugarcane Spirits
                  <i>(Cachaças)</i>

Garcia, André C.; Serafim, Felipe A. T.; Keukeleire, Denis De; Franco, Douglas W.

doi:10.5935/0103-5053.20140213

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Journal of the Brazilian Chemical Society

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Articles • J. Braz. Chem. Soc. 26 (1) • Jan 2015 • https://doi.org/10.5935/0103-5053.20140213 copy

Evaluation of Glycerol Profiles in Sugarcane Spirits (Cachaças)

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A new method for glycerol quantification in sugarcane spirits (cachaças) is proposed, based on sample derivatization using benzoyl chloride followed by solid-phase extraction and high performance liquid chromatography with diode array detection analysis. The limits of detection and quantification for glycerol analysis are 0.25 mg L⁻¹ and 0.74 mg L⁻¹, respectively. The accuracy is of 97.5%, the precision 93.5% and the linearity r² = 0.998 in the range of 0.56 mg L⁻¹ to 112.0 mg L⁻¹ of glycerol. Experiments with forty eight samples of aged and non-aged cachaças and seven alcoholic extracts of wood showed that the aging process contributes to increase the glycerol concentration. The average concentration of glycerol in aged cachaças were about 10-fold higher than in non-aged cachaças.

glycerol analysis; sugarcane spirits; alcoholic wooden extracts

	Aged^a a 34 samples;		Non-aged^b b 14 samples.
	Glycerol	Fatty acids	Glycerol	Fatty acids
Minimum	< LOQ	1.61	< LOD	0.86
Maximum	66	51.3	5.3	7.45
Average	17.5	13.3	1.75	3.63
Median	12.5	10.6	1.4	3.2

Wood	Glycerol^b b glycerol: MW = 92.09 g mol-1 LOD = 0.25 mg L-1 LOQ = 0.74 mg L-1;	Decanoic acid^c c decanoic acid: MW = 172.26 g mol-1, LOD = 225 μg L-1, LOQ = 750 μg L-1;	Dodecanoic acid^d d dodecanoic acid: MW = 200.32 g mol-1, LOD = 45 μg L-1, LOQ = 150 μg L-1;	Tetradecanoic acid^e e tetradecanoic acid: MW = 228.37 g mol-1, LOD = 45 μg L-1, LOQ = 150 μg L-1;	Hexadecanoic acid^f f hexadecanoic acid: MW = 256.42 g mol-1, LOD = 45 μg L-1, LOQ = 150 μg L-1.	Molar ratio: acids/ glycerol
Cachaça (blank)	< LOD	< LOD	0.22 ± 3.0 x 10^-2	0.20 ± 2.0 x 10^-2	0.44 ± 1.0 x 10^-2	-
Oak A	15 ± 0.46	6.5 ± 0.17	0.54 ± 1.0 x 10^-2	1.0 ± 0.31	0.54 ± 2.0 x 10^-2	0.34
Oak B	4.2 ± 0.40	9.5 ± 5.0 x 10 ²	0.53 ± 7.0 x 10^-2	1.2 ± 2.0 x 10^-2	1.1 ± 2.0 x 10^-2	1.75
Amburana	42 ± 0.11	24 ± 3.0 x 10 ²	0.59 ± 1.0 x 10^-2	6.5 ± 1.0 x 10^-2	1.2 ± 2.0 x 10^-2	0.40
Jatobá	12 ± 0.33	19 ± 0.13	0.60 ± 0.40	2.4 ± 0.34	1.1 ± 0.15	0.98
Jequitibá Br. A	3.4 ± 6.0 x 10 ²	1.7 ± 6.0 x 10 ²	0.48 ± 3.0 x 10^-2	0.38 ± 2.0 x 10^-2	0.63 ± 2.0 x 10^-2	0.56
Jequitibá Br. B	7.7 ± 9.7 x 10 ²	11 ± 0.15	0.52 ± 1.0 x 10^-2	0.89 ± 0.18	1.5 ± 0.20	0.99
Amendoim	4.0 ± 0.18	7.5 ± 0.41	0.56 ± 1.0 x 10^-2	0.96 ± 3.0 x 10^-2	1.0 ± 0.20	1.43

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