An overview of the technological development of atmospheric echosounders (SODARS)

Kleppe, John A.

doi:10.1007/bfb0009559

Cited by 1 publication

(1 citation statement)

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“…The isolation of GX usually needs a previous or simultaneous partial delignification of the wood. [1,4,6,[9][10][11][12][13][14] During this process, also the chemical and physicochemical properties of the polysaccharide might be affected to various extent resulting in chemical modification and/or degradation of the xylan molecule.…”

Section: Introductionmentioning

confidence: 99%

The Structural, Molecular and Functional Properties of Lignin‐Containing Beechwood Glucuronoxylan

Hromàdková

Ebringerová

Malovı́ková

2005

Macromolecular Symposia

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ummary: The samples of 4-O-methyl-D-glucurono-D-xylan (GX) with different lignin and uronic acid (MeUA) contents were prepared from beechwood by various procedures. The re-dissolution process of the partially water-soluble GX-2 lyophilizate in aqueous medium depended on the content and distribution of MeUA. In contrast to the supernatant after ultracentrifugation, the sediment had a significantly lower MeUA content and showed mainly high-molecular mass components. A part of lignin degradation products is separable by repeated dissolution and precipitation of GX in acidic and alkaline 80% ethanolic media with assistance of ultrasound. Irradiation in acidic ethanol (GX-3/ac) showed no effect on the distribution of the UV 254 -absorbing component. GX-3 sonicated in neutral and alkaline media (GX-3/ne, GX-3/alk) lost water solubility. The lignin-rich GX samples showed remarkable emulsifying efficiency and protein foam stabilization effect. In addition, the presence of phenolics provided antioxidant properties to these xylan preparations indicating their potential as polymeric radical scavengers.

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