Development of a Gas Chromatography-Mass Spectrometry Method for the Quantification of Glucaric Acid Derivatives in Beverage Substrates

Table 5

Quantification of GL and DGuA in beverage samples using the standard addition method.

Sample	GL			DGuA
	Concentration (ppm)	Average concentration (ppm)	% RSD	Concentration (ppm)	Average concentration (ppm)	% RSD
1	1.8	2.0	14%	11.4	12.0	7%
	2.2			12.6
2	0.009	0.008^1	28%	0.362	0.3	18%
	0.006			0.28
3	2.8	2.9	2%	3.5	3.5	2%
	2.9			3.6
4	1.3	1.2	11%	11.7	11.9	2.4%
	1.1			12.1

1Average concentration lower than LOQ but higher than LOD.