. Author manuscript; available in PMC: 2014 May 15.

Published in final edited form as: J Agric Food Chem. 2013 May 3;61(19):4614–4621. doi: 10.1021/jf3054017

Table 3.

In Vitro Degradability of Soluble (SOL) and Insoluble (INS) Fractions of Total Polysaccharides and the Most Abundant Cell Wall Polysaccharide Sugar Components of Three Dietary Fibers (Carboxymethylcellulose (CMC), Gum Arabic (GA), and Psyllium (PSY)) Before and After Their Supplementation.^a Data Are the Proportion of Sugars Degraded at 24 h by Human Fecal Inocula.

Fiber Source/Component	Fiber Fraction			Human Subject Supplementation Groups Baseline and Supplement (Suppl) Study Periods						p-value
		Placebo Control		CMC		GA		PSY		Fiber Group Baseline Period	Fiber Group Overall	Period	Fiber Group Supplement Period^b
		Baseline	Suppl	Baseline	Suppl	Baseline	Suppl	Baseline	Suppl
CMC
Glucose	SOL	.36(.15)	.39(.10)	.42(.07)	.50(.11)	.38(.18)	.34(.13)	.41(.10)	.41(.11)	.66	.09	.36	.22
Glucose	INS	.77(.20)	.69(.21)	.77(.19)^C	.58(.13)^d	.76(.14)	.64(.12)	.80(.19)	.64(.14)	.95	.77	<.001	.50
Xylose	SOL	.52(.10)	.49(.12)	.59(.09)	.61(.08)	.58(.10)	.51(.12)	.53(.10)	.52(.24)	.23	.11	.35	.55
Xylose	INS	.77(.19)	.83(.21)^A	.72(.27)	.76(.12)^A	.79(.15)	.72(.21)^A	.73(.29)^c	.39(.25)^d ^B	.85	.004	.04	.002
Total	INS	.75(.20)	.67(.21)	.78(.23)^C	.59(.17)^d	.75(.13)	.59(.20)	.77(.21)	.54(.12)	.96	.82	<.001	.17
Total	SOL	.41(.19)	.43(.10)	.45(.20)	.56(.12)	.42(.12)	.40(.15)	.48(.11)	.43(.10)	.78	.06	.34	.09
GA
Arabinose	SOL	.93(.11)	.91(.13)^A	.99(.07)^c	.89(.15)^d ^B	.92(.11)	.94(.10)^A	.98(.11)	.92(.10)^A	.20	.89	.005	.009
Galactose	SOL	.92(.11)	.92(.12)^A	.98(.07)^c	.89(.14)^d ^B	.91(.11)	.94(.09)^A	.97(.10)	.91(.09)^B	.21	.93	.04	.01
Uronics	SOL	.97(.12)	.94(.08)	.93(.14)	.97(.07)	.94(.13)	.97(.05)	.92(.13)	.92(.06)	.80	.64	.61	.51
Total	INS	.59(.24)	.50(.27)	.68(.21)^c	.31(.15)^d	.64(.13)	.20(.38)	.42(.36)	.21(.44)	.43	.54	.004	.10
Total	SOL	.94(.10)	.91(.10)	.97(.04)	.88(.22)	.92(.08)	.95(.07)	.95(.07)	.92(.08)	.45	.97	.52	.07
PSY
Xylose	INS	.84(.06)^d	.89(.04)^c	.88(.04)	.86(.06)	.85(.06)	.87(.05)	.83(.09)^C	.87(.06)^d	.19	.80	.009	.003
Arabinose	INS	.72(.08)^d	.79(.05)^c	.74(.06)	.76(.06)	.73(.05)	.73(.10)	.73(.06)	.75(.04)	.75	.75	.009	.08
Uronics	INS	.89(.19)	.94(.16)	.99(.08)	.89(.06)	.97(.07)	.95(.11)	.92(.10)	.91(.08)	.15	.67	.12	.02
Total	INS	.79(.06)	.84(.07)	.83(.05)	.79(.06)	.81(.05)	.79(.06)	.78(.07)	.80(.02)	.20	.69	.92	.003^C
Total	SOL	.18(.11)	.30(.26)	.36(.09)	.47(.21)	.25(.14)	.32(.20)	.15(.13)	.70(.31)	.18	.26	.02	.92

Values are means (sds); supplement period means presented are unadjusted for baseline values; bolded values show where the substrate was the same as the fiber that the group ingested.

Because baseline values serve as the reference time point and are coded as 0, these p-values also test the significance of group × period interaction effect.

^c,d

Values for in vitro degradability of a fiber source component for baseline and supplementation periods within a fiber supplementation group that do not share a superscript within a row differ significantly (p <0.05).

^A,B

Values for in vitro degradability of a fiber source component in the supplementation period that do not share a superscript within a row differ significantly between fiber supplementation groups (p <0.05).

For this row, none of the comparisons between the values during the supplementation period were significantly different after adjustment for values in the baseline period.