Crystallization behavior of glucomannan

Chanzy, H.; Grosrenaud, A.; Joseleau, J.P.; Dubé, M.; Marchessault, R. H.

doi:10.1002/bip.360210206

Cited by 72 publications

(42 citation statements)

References 19 publications

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“…(c) The presence of slightly branched Man residues in fraction K4p would also contribute to the insolubility of this material. Glucomannans can crystallize on to cellulose [36], and may be expected to form an insoluble complex with the less branched xyloglucans. (d) The presence of significant amounts of 4-linked Xyl residues in and the absence of branched Xyl residues from fractions KIA and K3A suggest that a proportion of these residues may form integral parts of the xyloglucans.…”

Section: Glycosidic-linkage Analysis Of Koh-soluble Fractionsmentioning

confidence: 99%

Cell-wall polysaccharides and glycoproteins of parenchymatous tissues of runner bean (Phaseolus coccineus)

Ryden

Selvendran

1990

Biochemical Journal

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1. Polymers were solubilized from the cell walls of parenchyma from mature runner-bean pods with minimum degradation by successive extractions with cyclohexane-trans-1,2-diamine-NNN'N'-tetra-acetate (CDTA), Na2CO0 and KOH to leave the a-cellulose residue, which contained cross-linked pectic polysaccharides and Hyp-rich glycoproteins. These were solubilized with chlorite/acetic acid and cellulase. The polymers were fractionated by anion-exchange chromatography, and fractions were subjected to methylation analysis. 2. The pectic polysaccharides differed in their ease of extraction, and a small proportion were highly cross-linked. The bulk of the pectic polysaccharides solubilized by CDTA and Na2C03 were less branched than those solubilized by KOH. There was good evidence that most of the pectic polysaccharides were not degraded during extraction. 3. The protein-containing fractions included Hyp-rich and Hyp-poor glycoproteins associated with easily extractable pectic polysaccharides, Hyp-rich glycoproteins solubilized with 4M-KOH + borate, the bulk of which were not associated with pectic polysaccharides, and highly cross-linked Hyp-rich glycoproteins. 4. Isodityrosine was not detected, suggesting that it does not have a (major) cross-linking role in these walls. Instead, it is suggested that phenolics, presumably linked to C-5 of 3,5-linked Araf residues of Hyp-rich glycoproteins, serve to crosslink some of the polymers. 5. There were two main types of xyloglucan, with different degrees of branching. The bulk of the less branched xyloglucans were solubilized by more-concentrated alkali. The anomeric configurations of the sugars in one of the highly branched xyloglucans were determined by 13C-n.m.r. spectroscopy. 6. The structural features of the cell-wall polymers and complexes are discussed in relation to the structure of the cell walls of parenchyma tissues. INTRODUCTIONThe plant cell wall has a complex structure, with properties that depend on the tissue type and stage of development. The physical characteristics and biological functions of the cell walls depend primarily on the constituent structural polymers and how they interact with each other to form the wall matrix. The challenge is to identify the cell-wall polysaccharides, glycoproteins, proteoglycans and phenolics and understand how these are assembled in a particular cell type. Cell-wall models have been proposed based mainly on studies of suspensioncultured sycamore cells, which are deficient in polymers of the middle lamella [1,2]. In these studies exhaustive treatment with polygalacturonase was initially used, so that information on the composition and structure of some of the pectic polysaccharides would have been lost. In previous papers we have studied parenchyma cell walls from the pods of Phaseolus coccineus in some depth, but the pectic polysaccharides were degraded by the conditions of extraction used [3]. Nevertheless much information about the constituent glycoproteins [4,5], proteoglycans [6] and xyloglucans [7,8] has been obtained.We ha...

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Section: Glycosidic-linkage Analysis Of Koh-soluble Fractionsmentioning

confidence: 99%

Cell-wall polysaccharides and glycoproteins of parenchymatous tissues of runner bean (Phaseolus coccineus)

Ryden

Selvendran

1990

Biochemical Journal

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“…It was shown that with mannan and glucomannan polymers, the mannan I structure was obtained more easily with low molecular weight material, whereas mannan II corresponded to higher molecular weight (4,8). A close resemblance exists thus between the crystallization of cellulose IV^ and mannan I as with both polymers, the crystallization phenomena appear to be directed by related parameters.…”

Section: Discussionmentioning

confidence: 82%

“…This is in particular described in the case of mannan and glucomannan polymers (4,8) where crystals of mannan I are usually obtained with low degree of polymerization (DP) material, whereas only mannan II is found when higher DP are recrystallized.…”

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confidence: 94%

Polymorphic and Morphological Aspects of Recrystallized Cellulose as a Function of Molecular Weight

Quenin

Chanzy

1987

ACS Symposium Series

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The polymorphism and morphology of cellulose precipitated from solutions in amine oxide by the slow diffusion of water vapors, was investigated, as functions of the temperature of recrystallization and the degree of polymerization(DP) of the material to be recrystallized. At temperatures around 90°C, low DP cellulose crystallized almost exclusively as cellulose IV II , whereas higher DP material was found in the form of cellulose II. Substantial differences were also found in the morphologies of the various samples: with cellulose II, rod-like crystals were obtained with low DP material while a crystalline fibrillar gel precipitated when high DP samples were recrystallized. In all cases, cellulose IV II was obtained as a granular precipitate.The crystallization behaviour of polysaccharides is influenced not only by their chain conformation but also by the multiple possibilities of inter and intra molecular hydrogen bonding (1,2). This multiplicity, in particular, explains why several polymorphic forms can be obtained when different crystallization conditions are selected for a given specimen.A survey of the various parameters which have a role in directing the crystallization of a given polysaccharide toward one or another polymorph, presents the temperature of crystallization as being the most influential: polysaccharides such as cellulose (3), mannan (4), dextran (5,6), etc. are particularly sensitive to changes in crystallization temperatures as they yield completely different crystals at low or high temperature.In other instances, it is the solvent of crystallization which plays a decisive role in orienting the crystallization toward one or the other polymorph. Such solvent dependant crystallization is well documented in the case of amy lose (7) where minute changes in solvent/precipitant ratio have a dramatic effe ct on shifting the recrystallized amylose among three polymorps: amylose A,Β and V.

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“…The properties of this gel were reviewed by Okimasu et al (1). There have been, however, very few data on the morphological characteristics of the gel (2,3). We have studied the liquid crystalline behaviors of cellulosic materials and reported about the crosslinked hydroxypropyl cellulose (HPC) films retaining cholesteric liquid crystalline order (4).…”

Section: Introductionmentioning

confidence: 99%

“…When konjac mannan is blended with HPC, the resultant material is expected to exhibit some novel properties. Konjac mannan is known to have an affinity to cellulose (2) or xanthan (5).…”

Section: Introductionmentioning

confidence: 99%

Scanning electron microscopy of blend of konjac mannan and hydroxypropyl cellulose.

et al. 1992

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Crystallization behavior of glucomannan

Cited by 72 publications

References 19 publications

Cell-wall polysaccharides and glycoproteins of parenchymatous tissues of runner bean (Phaseolus coccineus)

Cell-wall polysaccharides and glycoproteins of parenchymatous tissues of runner bean (Phaseolus coccineus)

Polymorphic and Morphological Aspects of Recrystallized Cellulose as a Function of Molecular Weight

Scanning electron microscopy of blend of konjac mannan and hydroxypropyl cellulose.

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