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

Table 3

Average recovery yields (%) and relative standard deviation (%) at each level of concentration in spiked beverage samples (𝑛=4 at each level, i.e., 2 replicates and 2 injections).

Sample		GL				DGuA
		Concentration level^1				Concentration level^1
		1	2	3	4	1	2	3	4
1	% recovery	99.10	109.01	101.24	99.38	94.20	85.72	90.14	103.57
	% RSD	27.90	9.12	0.65	3.23	14.66	5.44	3.43	4.17
2	% recovery	85.16	111.86	100.18	99.63	95.42	111.43	100.47	99.37
	% RSD	1.99	3.29	1.88	1.57	15.10	4.77	6.83	2.44
3	% recovery	105.69	91.58	99.18	100.10	88.82	87.96	101.58	99.90
	% RSD	23.90	4.91	11.14	4.80	6.70	3.69	9.13	3.13
4	% recovery	96.58	98.57	101.49	99.79	97.60	94.20	100.78	100.18
	% RSD	2.96	1.15	1.63	1.75	6.64	1.94	2.16	4.02

11 is the lowest and 4 is the highest level of concentration in spiked samples.