Characterization of curdlan in aqueous sodium hydroxide

Nakata, Mitsuo; Kawaguchi, Tsuyoshi; Kodama, Yuzo; Konno, Akira

doi:10.1016/s0032-3861(97)00417-5

Cited by 78 publications

(47 citation statements)

References 36 publications

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“…The existence of (1 ? 3)--D-glucan-OH À described in this article can be used to assess the effects of solvent on the chain conformation and give a satisfactory explanation to the experimental observation of Nakata et al, 34 who have demonstrated that the curdlan chain in the waterdiluted cadoxen is appreciably contracted compared with that in the 0.3 M NaOH solution.…”

Section: Excluded-volume Effectssupporting

confidence: 56%

“…value of lentinan in 0.1M NaOH solution may be attributed to the steric hindrance caused by side chains and the interaction between lentinan molecules and OH À anions. 34 of curdlan in 0.3M NaOH solution and substantially smaller than that expected for the theoretical coil-limiting value. It is believed that the smaller F value may be attributed to the increased stiff nature, 38 resulting from the interaction between macromolecules and solvent.…”

Section: Chain Conformation Characteristicsmentioning

confidence: 52%

“…Schizophyllan dissolves in DMSO as a single-stranded flexible chain with the viscosity exponent ¼ 0.697 on the basis of the research by Kashiwagi et al, 31 Yamakawa, 32 and Yanaki et al 33 In addition, Nakata et al 34 have mentioned that the curdlan may be a relatively flexible chain in 0.3M NaOH solution with the viscosity exponent ¼ 0.78, similar to that for lentinan in 0.1M NaOH solution. Obviously, the viscosity exponent of the -(1 ?…”

Section: Resultsmentioning

confidence: 97%

“…They have found that the persistence length is less than 3 nm, which is smaller than that of lentinan in 0.1M NaOH solution. Moreover, Nakata et al 34 have reported the persistence length of curdlan in 0.3M NaOH (2q ¼ 13.5 nm). The Monte Carlo method has neglected solvent effects because of the inherent difficulties in dealing quantitatively with glucan-solvent interactions.…”

Section: Excluded-volume Effectsmentioning

confidence: 99%

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Effects of excluded volume and polydispersity on solution properties of lentinan in 0.1 M NaOH solution

Zhang¹,

Xu²,

Zhang³

2005

Biopolymers

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Seven lentinan fractions of various weight-average molecular weights (M(w)), ranging from 1.45 x 10(5) to 1.13 x 10(6) g mol(-1) were investigated by static light scattering and viscometry in 0.1M NaOH solution at 25 degrees C. The intrinsic viscosity [eta] - M(w) and radius of gyration s(2)(z) (1/2) - M(w) relationships for lentinan in 0.1M NaOH solution were found to be represented by [eta] = 5.1 x 10(-3)M(w) (0.81) cm(3) g(-1) and s(2)(z) (1/2) = 2.3 x 10(-1)M(w) (0.58) nm, respectively. Focusing on the effects of the M(w) polydispersity with the Schulz-Zimm distribution function, the data of M(w), s(2)(z) (1/2), and [eta] was analyzed on the basis of the Yoshizaki-Nitta-Yamakawa theory for the unperturbed helical wormlike chain combined with the quasi-two-parameter (QTP) theory for excluded-volume effects. The persistence length, molecular weight per unit contour length, and the excluded-volume strength were determined roughly to be 6.2 nm, 980 nm(-1), and 0.1, respectively. Compared with the theoretical value calculated by the Monte Carlo model, the persistence length is longer than that of the single (1 --> 3)-beta-(D)-glucan chain. The results revealed that lentinan exists as single-stranded flexible chains in 0.1M NaOH solution with a certain degree of expansion due to the electrostatic repulsion from the interaction between the OH(-) anions and lentinan molecules.

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Section: Excluded-volume Effectssupporting

confidence: 56%

Section: Chain Conformation Characteristicsmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 97%

Section: Excluded-volume Effectsmentioning

confidence: 99%

See 2 more Smart Citations

Effects of excluded volume and polydispersity on solution properties of lentinan in 0.1 M NaOH solution

Zhang¹,

Xu²,

Zhang³

2005

Biopolymers

View full text Add to dashboard Cite

show abstract

“…l may be 0.425 nm for glucopyranose of the phosphated derivative (Nakanishi et al, 1993), together with −1 = 12.0 ± 2 nm, M L = 780 ± 40 nm −1 , C ∝ of the phosphated derivative in 0.15 M NaCl was calculated to be 15.1 ± 1. The C ∝ value was significantly larger than that of amylose, (1 → 4)-␣-d-glucan in Me 2 SO (C = 5.0) (Nakanishi et al, 1993), and that of curdlan, (1 → 3)-␤-d-glucan in 0.3 M NaOH aqueous sulution (C = 10.5) (Nakata, Kawaguchi, Kodama, & Konno, 1998). The results indicated that the phosphated derivative molecules with main chain structure of (1 → 3)-␣-d-glucan were more extended than those of the (1 → 4)-␣-d-glucan and the (1 → 3)-␤-d-glucan, which was in good agreement with the conclusion from Burton and Brant (1983).…”

Section: Conformation Parametersmentioning

confidence: 84%