Dye adsorption revisited: application of the cationic dye adsorption method for the quantitative determination of the acidic surface groups of nanocellulose materials

Dye adsorption revisited: Application of the cationic dye adsorption method for the quantitative determination of the acidic surface groups of nanocellulose materials

10.21203/rs.3.rs-234234/v1 ◽

2021 ◽

Author(s):

Jun Araki

Keyword(s):

Dye Adsorption ◽

Carboxyl Groups ◽

Cationic Dye ◽

Cellulose Nanowhiskers ◽

Adsorption Method ◽

Short Period ◽

Light Absorbance ◽

Mercapto Groups ◽

Rapid Treatment

Abstract The surface carboxyl and sulfate groups on cellulose nanowhiskers were quantified via the adsorption of toluidine blue O (TBO), a cationic dye. Here, simple and rapid protocols, such as mixing the nanowhisker suspensions with a dye solution, separating the supernatants via centrifugation, and determining the excess dye concentration via visible light absorbance techniques, were used to obtain reproducible results comparable with those obtained via titration. In addition to facilitating the discrete quantification of the sulfate and carboxyl groups, the TBO adsorption method enabled carboxyl quantification in the presence of mercapto groups, which was difficult to achieve via titration. The adsorption of TBO onto the carboxyl groups was completed within 30 min, enabling the rapid treatment of many samples within a short period.

Download Full-text

Quantitative determination of surface groups in silica : IR-analysis of isolated silanol groups in pyrogenic silica

Journal of Molecular Structure ◽

10.1016/0022-2860(80)80100-1 ◽

1980 ◽

Vol 60 ◽

pp. 409-414 ◽

Cited By ~ 16

Author(s):

Siegmar Läufer

Keyword(s):

Quantitative Determination ◽

Surface Groups ◽

Silanol Groups ◽

Pyrogenic Silica ◽

Ir Analysis

Download Full-text

The quantitative measurement of Alcian Blue–glycosaminoglycan complexes

Biochemical Journal ◽

10.1042/bj1310343 ◽

1973 ◽

Vol 131 (2) ◽

pp. 343-350 ◽

Cited By ~ 230

Author(s):

P. Whiteman

Keyword(s):

Complex Formation ◽

Quantitative Determination ◽

Alcian Blue ◽

Quantitative Measurement ◽

Cationic Dye ◽

Molecular Binding ◽

Maximum Precipitation ◽

Hurler’S Syndrome ◽

Acid Glycosaminoglycans

1. A simple new quantitative micro method was developed to study the interaction of the cationic dye Alcian Blue 8GX and acid glycosaminoglycans under different conditions. After washing with ethanol the precipitated Alcian Blue–glycosaminoglycan complex was dissociated in Manoxol IB solution and the amount of bound dye measured spectrophotometrically. 2. Reaction profiles of complex-formation were determined in the presence of different concentrations of MgCl2 at pH5.8, and could be used to study the critical electrolyte concentrations of glycosaminoglycans. At least 50mm-MgCl2 was required to produce maximum precipitation of, and maximum uptake of, Alcian Blue by standard glycosaminoglycans. Maximum uptake of Alcian Blue by glycosaminoglycans in the urine of a patient with Hurler's syndrome required the presence of 25–50mm-MgCl2. 3. Under standard conditions of maximum interaction, calibration curves for the quantitative determination of a series of standard glycosaminoglycans in 20μl volumes were nearly linear over the range 1–10μg. 4. The technique was used to determine the molecular binding ratios of Alcian Blue to glycosaminoglycans under controlled conditions.

Download Full-text

Studies on the effect of clay and organic matter contents on the determination of cation exchange properties in clay soils by the ammonium acetate and methylene-blue methods

Agricultural and Food Science ◽

10.23986/afsci.71727 ◽

1969 ◽

Vol 41 (2) ◽

pp. 73-81

Author(s):

Raimo Erviö ◽

Osmo Mäkitie

Keyword(s):

Methylene Blue ◽

Organic Matter ◽

Ammonium Acetate ◽

Organic Matter Content ◽

Dye Adsorption ◽

Clay Content ◽

Matter Content ◽

Exchangeable Cations ◽

Adsorption Method

The correlation between CEC-values obtained by ammonium acetate and methylene-blue adsorption methods is relatively good (r = 0.86***). The latter method gives, however, about 30 per cent lower values for exchangeable cations. The extraction ratio used in the dye adsorption method has a clear effect on the level of the CEC-values. More complete adsorption was obtained with wider ratios. With increasing clay and humus contents the adsorption becomes more dependent on the soil-dye ratio. The effect of humus is more pronounced than that of clay. The CEC-values obtained by the ammonium acetate method were in better correlation to the clay content of soils than the values obtained by the dye-adsorption method, while the latter values were better correlated to the organic matter content of the soil. The percentages of exchangeable potassium, sodium and, especially, of magnesium, decrease when the clay content decreases, while that of calcium increases slightly. The ratio between exchangeable calcium and magnesium depends on the clay content of the soil ( r = 0.56***) so that the value of the ratio Ca:Mg increases when the clay content decreases (Table 1, q).

Download Full-text

Quantitative Determination of Dyes in Textile Fibers

Textile Research Journal ◽

10.1177/004051757604600703 ◽

1976 ◽

Vol 46 (7) ◽

pp. 483-484 ◽

Cited By ~ 2

Author(s):

Krik Kissa

Keyword(s):

Quantitative Determination ◽

Cationic Dyes ◽

Disperse Dyes ◽

Cationic Dye ◽

Textile Fibers ◽

Polyester Fibers

The dye content of polyester fibers on fiber blends containing both disperse and cationic dyes is determined by extracting the disperse dyes with chlorobenzene, followed by extraction of the cationic dye with DMF containing 55 g/l. ZnCl2, 8 ml/l. conc HCl (37%), and 20 g/l. 2,6-di- t-butyl-4-methylphenol.

Download Full-text