Use of multivariate curve resolution and a high-speed diode array ultraviolet detector in size-exclusion chromatography of lignin-based copolymers

Nicholson, John; Meister, John J.; Patil, Damodar R.; Field, Larry R.

doi:10.1021/ac00277a042

Cited by 25 publications

(10 citation statements)

References 18 publications

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“…This method is quite sensitive for optical absorption and has been applied to trace analysis in parts-per-trillion (pg/mL) to sub-part-per-trillion levels (3,4). Trace analysis with PAS can be applied not only to true solutions but to turbid and colloidal solutions which are light scattering materials (5,6). Oda et al (5) have shown the sensitivity of PAS, that is the slope of the calibration curve, is independent of particle size, because the PA signal magnitude is proportional to the optical energy absorbed by the solution and is not affected by light scattering.…”

Section: Resultsmentioning

confidence: 99%

“…Trace analysis with PAS can be applied not only to true solutions but to turbid and colloidal solutions which are light scattering materials (5,6). Oda et al (5) have shown the sensitivity of PAS, that is the slope of the calibration curve, is independent of particle size, because the PA signal magnitude is proportional to the optical energy absorbed by the solution and is not affected by light scattering. They showed that two calibration curves for a precipitated BaS04 mixture of 6-20 and 0.5-6 jim particles overlapped each other when the 514.5-nm lasing line of an Ar laser was used for the excitation beam.…”

Section: Resultsmentioning

confidence: 99%

“…The combination of principal component analysis with the self-modeling technique, first proposed by Lawton and Sylvestre (1), has been used extensively in recent years (2)(3)(4)(5)(6). Modification of the original procedure and additional resolution conditions have been used to enhance the decomposition of relatively complicated two-component systems (7)(8)(9).…”

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confidence: 99%

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Three-component self-modeling technique applied to luminescence spectra

Sun¹,

Sears²,

Saltiel³

1987

Anal. Chem.

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It Is shown that the selection of pure component spectral coefficients Is Improved when additional applicable constraints are Imposed. The method Is demonstrated first for a twocomponent system (the phosphorescence and delayed fluorescence of benzophenone) and then extended to three components. It Is first shown that It succeeds In reproducing theoretical curves used to construct an artificial three-component Input matrix and then It Is applied to resolve experimental spectra composed of the fluorescence of two conformers of trans-,2-di(2-naphthyl)ethene (DNE) and a background spectrum dominated by Raman emission at the excitation wavelength region.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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Three-component self-modeling technique applied to luminescence spectra

Sun¹,

Sears²,

Saltiel³

1987

Anal. Chem.

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“…This capacity allows spectra to be taken at numerous times during the elution of a chromatographic peak and is critical to prove the existence of graft copolymers by multivariate curve resolution. 10…”

Section: Methodsmentioning

confidence: 99%

Synthesis and properties of several cationic graft copolymers of lignin

Meister¹,

Li²

1992

Macromolecules

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A method of grafting lignin has been developed which allows water-soluble, cationic graft copolymers of lignin to be made. The grafting reaction is a solution polymerization often run in aprotic, polar, organic solvents. The cationic copolymers are made by conducting the reaction with dimethyldiprop-2enylammonium chloride, (5-methyl-4-oxo-3-oxahex-5-enyl)trimethylammonium methyl sulfate, or (5-methyl-4-oxo-3-oxahex-5-enyl)trimethylammonium chloride. The lignins grafted have been obtained from pine by the kraft process.

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“…used the initial version of the above software package to perform curve resolution of lignin-based copolymers analyzed by size-exclusion chromatography. 21 After construction of a calibration curve, quantitative results were obtained for unresolved peaks, allowing the researchers to estimate the concentration of a chromophore adduct in a particular molecular size fraction.…”

Section: Methods Based On Lawton and Sylvestre's Methodsmentioning

confidence: 99%