Structue of branche-points in natural rubber: Analysis decomposition with physical treatment

K. Nawamawat; J. Sakdapipanich; D. Mekkriengkrai; Y. Tanaka

Structue of branche-points in natural rubber: Analysis decomposition with physical treatment

K. Nawamawat
, J. Sakdapipanich
, D. Mekkriengkrai
, Y. Tanaka

Mahidol University

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

The structure of branch-points in natural rubber (NR) was studied by structural analysis after washing of fresh and aged NR latices with centrifugation three times in the presence of sodium dodecyl sulphate (SDS). The nitrogen content of rubberfrom aged latex (HG-NR) and fresh latex (LG-NR) decreased to 0.02% after three times centrifugation, which is similarto enzymatic deproteinized NR. The gel content of HG-NR and LG-NR differently decreased, i.e., stepwise decreased to ca. 6% for the former, whereas the latter was leveled off at ca. 3 % after centrifuge. The decrease of M_w value and Huggins' k' constant by washing of latex indicated the step-by-step decreasing of branch-points of HG-NR. This suggests that the proteins participate in the gel formation of NR latex. The SDS-PAGE analysis of proteins extracted from cream and serum fractions revealed that all the proteins including those on the surface of rubber particles were totally diminished by washing without protein degradation.

Original language	English
Pages (from-to)	518-522
Number of pages	5
Journal	KGK Kautschuk Gummi Kunststoffe
Volume	61
Issue number	10
Publication status	Published - Oct 2008
Externally published	Yes

Keywords

Branch-point
Gel fraction
Natural rubber
Physical treatment

Cite this

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title = "Structue of branche-points in natural rubber: Analysis decomposition with physical treatment",

abstract = "The structure of branch-points in natural rubber (NR) was studied by structural analysis after washing of fresh and aged NR latices with centrifugation three times in the presence of sodium dodecyl sulphate (SDS). The nitrogen content of rubberfrom aged latex (HG-NR) and fresh latex (LG-NR) decreased to 0.02\% after three times centrifugation, which is similarto enzymatic deproteinized NR. The gel content of HG-NR and LG-NR differently decreased, i.e., stepwise decreased to ca. 6\% for the former, whereas the latter was leveled off at ca. 3 \% after centrifuge. The decrease of Mw value and Huggins' k' constant by washing of latex indicated the step-by-step decreasing of branch-points of HG-NR. This suggests that the proteins participate in the gel formation of NR latex. The SDS-PAGE analysis of proteins extracted from cream and serum fractions revealed that all the proteins including those on the surface of rubber particles were totally diminished by washing without protein degradation.",

keywords = "Branch-point, Gel fraction, Natural rubber, Physical treatment",

author = "K. Nawamawat and J. Sakdapipanich and D. Mekkriengkrai and Y. Tanaka",

year = "2008",

month = oct,

language = "English",

volume = "61",

pages = "518--522",

journal = "KGK Kautschuk Gummi Kunststoffe",

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TY - JOUR

T1 - Structue of branche-points in natural rubber

T2 - Analysis decomposition with physical treatment

AU - Nawamawat, K.

AU - Sakdapipanich, J.

AU - Mekkriengkrai, D.

AU - Tanaka, Y.

PY - 2008/10

Y1 - 2008/10

N2 - The structure of branch-points in natural rubber (NR) was studied by structural analysis after washing of fresh and aged NR latices with centrifugation three times in the presence of sodium dodecyl sulphate (SDS). The nitrogen content of rubberfrom aged latex (HG-NR) and fresh latex (LG-NR) decreased to 0.02% after three times centrifugation, which is similarto enzymatic deproteinized NR. The gel content of HG-NR and LG-NR differently decreased, i.e., stepwise decreased to ca. 6% for the former, whereas the latter was leveled off at ca. 3 % after centrifuge. The decrease of Mw value and Huggins' k' constant by washing of latex indicated the step-by-step decreasing of branch-points of HG-NR. This suggests that the proteins participate in the gel formation of NR latex. The SDS-PAGE analysis of proteins extracted from cream and serum fractions revealed that all the proteins including those on the surface of rubber particles were totally diminished by washing without protein degradation.

AB - The structure of branch-points in natural rubber (NR) was studied by structural analysis after washing of fresh and aged NR latices with centrifugation three times in the presence of sodium dodecyl sulphate (SDS). The nitrogen content of rubberfrom aged latex (HG-NR) and fresh latex (LG-NR) decreased to 0.02% after three times centrifugation, which is similarto enzymatic deproteinized NR. The gel content of HG-NR and LG-NR differently decreased, i.e., stepwise decreased to ca. 6% for the former, whereas the latter was leveled off at ca. 3 % after centrifuge. The decrease of Mw value and Huggins' k' constant by washing of latex indicated the step-by-step decreasing of branch-points of HG-NR. This suggests that the proteins participate in the gel formation of NR latex. The SDS-PAGE analysis of proteins extracted from cream and serum fractions revealed that all the proteins including those on the surface of rubber particles were totally diminished by washing without protein degradation.

KW - Branch-point

KW - Gel fraction

KW - Natural rubber

KW - Physical treatment

UR - https://www.scopus.com/pages/publications/54249128403

M3 - Article

AN - SCOPUS:54249128403

SN - 0948-3276

VL - 61

SP - 518

EP - 522

JO - KGK Kautschuk Gummi Kunststoffe

JF - KGK Kautschuk Gummi Kunststoffe

IS - 10

ER -

Structue of branche-points in natural rubber: Analysis decomposition with physical treatment

Abstract

Keywords

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