Table 3. Acid group content and red/green ratio.

Sample type	Acid groups μmol /g	95% CI	R-G ratio	95% CI
Microcrystalline cellulose	37	2	0.52	0.01
Fresh-cut spruce	79	4	0.97	0.07
Acetic-acid-washed spruce	117	6	1.16	0.05
Acid-chlorite-treated spruce	186	9	1.69	0.05
Fully delignified spruce	482	24	1.83	0.06
Oxidized cellulose	571	29	1.43	0.02
Carboxymethyl agarose beads	1118	56	1.89	0.06

95% CI = 95% confidence interval calculated using a Student’s t formalism