Iron(III) ions could be reduced to iron(II) ionic species and released in solution, and the remaining uronic acids
residues would bind to a new iron(III) ionic species striking a balance.
The uronic acids
assay: a method for the determination of chemical activity on biofilm EPS.
Asboe-Hansen, New method for quantitative determination of uronic acids
Stephen suggested that the polysaccharide components of the gum from peach tree belonged to the arabinogalactan group with amounts of arabinose, xylose, galactose, glucose, and uronic acids
Asboe Hansen, "New method for quantitative determination of uronic acids
," Analytical Biochemistry, vol.
Compared to cranberry pomace, all extracts obtained with the microwave-assisted approach contained higher percentages of uronic acids
and a lower percentage of neutral sugars, while maintaining similar proportions of arabinose and galactose.
In kernels of Sclerocarya birrea, uronic acids
constituted more than 90% of both dietary fibre fractions.
Due to the significance of chemical analysis and to collect more data on the fibrous raw material in question, chemical characterization of the reed fibers was done by employing the following analyses: the extractive content in acetone (TAPPI T 280 [micro]m-99), total extractive content (TAPPI T 264cm-97-adapted), insoluble lignin (TAPPI T 222 om-98-adapted) and soluble TAPPI A 250) in acid, sugar composition (HPLC-PAD according to WALLIS et al., 1996), inorganic compounds (TAPPI T 211 and TAPPI T 244) and uronic acids
(SUNDBERG et al., 1996).
were determined by the method of Filisetti-Cozzi & Carpita (1991).
The total uronic acids
and acetyl group contents (Figure 2), both hemicelluloses components, also showed negative correlation with harvesting age, especially for clone B.
Wave number/[cm.sup.-1] Assignments * 3434 O-H (stretching) 2927 C-H (stretching) 1645, 1542, 1398 C-O (bending vibrations of uronic acids
) 1454, 1238 C-H (deformation) 979 pyranose ring 836 a-D-Glucopyranoside bond vibration 665 Se-O-C (asymmetric stretching) * Refer to [24, 25].
Carpita, "Measurement of uronic acids
without interference from neutral sugars," Analytical Biochemistry, vol.