Download Advances in Macromolecular Carbohydrate Research, Volume 1 by R.J. Sturgeon PDF

By R.J. Sturgeon

Lately the main major advances in carbohydrate study were made within the wisdom of the constitution and serve as of carbohydrates within the macromolecular country. This identify addresses these parts of the topic during which the authors think crucial paintings is being performed.

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Extra resources for Advances in Macromolecular Carbohydrate Research, Volume 1

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Aculeatus A. nidulans MW (Da) Optimum pH pl Activity towards: Linear (l->5)-a-L-arabinan Beet arabinan p-Nitrophenyl a-Larabinofiiranoside Products after prolonged incubation* Reference A. niger N400 A. 9 ++ + — ++ + — ++ + — ++ + — A2 + A3 Note: ^A2 arabinobiose; A3 arabinotriose. 137 A2+A3 149 138, 149 172,173 50 BELDMANETAL. with the A. niger enzyme having five binding subsites and the A. aculeatus enzyme six [174]. The extent and rate of branched arabinan hydrolysis by all ewrfo-arabinanases appears affected by the degree of substitution on the arabinan backbone by (l->3)- or (l->2)-a-L-arabinofuranosyl residues [19,30,117,137,173].

The ^^C-NMR spectrum of the L-arabinan (3% in D2O) (reprinted with permission from ref. 23). signal intensities may be affected by differences in segmental motion between the arabinan side chains and the pectic backbone [77] or by other unidentified factors. In general, NMR can be used as a quick and effective method to study the structure of water-soluble arabinans. Other Characteristics Churms et al. [14] characterized their microcrystalline linear L-arabinan also by X-ray crystallographic analysis and deduced Table 4.

Awamori enzyme Arabinans and Arabinan Degrading Enzymes 49 [88] is designated AXH-m, while the enzyme from B. adolescentis is designated AXH-(i3 [168]. endo- 1-^5-a-i-Arabinanase. e«(io-Arabinanases have been recently described from SQWQval Aspergillus species, namely^, aculeatus [137], A. nidulans [149], and a few further A. niger strains [138,171,172]. The physicochemical properties of these enzymes, summarized in Table 17, are comparable to those of the previously examined ewtio-arabinanases (see Table 10).

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