Radiolysis studies of aqueous κ-carrageenan

被引：15

作者：

Abad, L. V. ^{[1
]}

Kudo, H. ^{[2
]}

Saiki, S. ^{[2
,3
]}

Nagasawa, N. ^{[3
]}

Tamada, M. ^{[3
]}

Fu, H. ^{[2
]}

Muroya, Y. ^{[2
]}

Lin, M. ^{[2
,4
]}

Katsumura, Y. ^{[2
,4
]}

Relleve, L. S. ^{[1
]}

Aranilla, C. T. ^{[1
]}

DeLaRosa, A. M. ^{[1
]}

机构：

[1] Philippine Nucl Res Inst, Quezon City, Philippines

[2] Univ Tokyo, Grad Sch Engn, Nucl Profess Sch, Naka, Ibaraki 3191188, Japan

[3] Japan Atom Energy Agcy, Quantum Beam Sci Directorate, Takasaki, Gunma 3701292, Japan

[4] Japan Atom Energy Agcy, Adv Sci Res Ctr, Naka, Ibaraki 3191195, Japan

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2010年 / 268卷 / 10期

关键词：

kappa-Carrageenan; Radiation degradation yield; Pulse radiolysis; Conformation; MOLECULAR-WEIGHT CARRAGEENANS; DYNAMIC LIGHT-SCATTERING; TO-HELIX TRANSITION; ANTI-HIV ACTIVITY; LAMBDA-CARRAGEENAN; HYDRATED ELECTRON; IOTA-CARRAGEENAN; CONFORMATIONAL-CHANGE; RATE CONSTANTS; DEGRADATION;

D O I：

10.1016/j.nimb.2010.02.006

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The effects on N2O and N-2 gas on the radiation degradation yield of aqueous kappa (kappa-) carrageenan were investigated. The G(d) of solution saturated with N2O solution was expectedly much higher than in air (1.7 and 1.2 X 10(-7) mol J(-1)). On the other hand, a lower G(d) of 1.1 x 10(-7) mol J(-1) was obtained from kappa-carrageenan solution saturated with N-2. The rate constant of reaction of OH radicals with sonicated and irradiated kappa-carrageenan were determined using e-beam pulse radiolysis. The rate constant of OH center dot interaction with sonicated kappa-carrageenan decreased with decreasing molecular weight. On the other hand, the OH center dot interaction with irradiated kappa-carrageenan decreased but did not vary significantly with decreasing molecular weight. Metal ion (Na+) induced conformational transition into helical form decreased the rate constant of OH center dot reaction with kappa-carrageenan. Likewise, the G(d) in aqueous form was affected by the conformational state of kappa-carrageenan. The helical conformation gave a lower G(d) (7 x 10(-8) mol J(-1)) than the coiled conformation (G(d) = 1.2 x 10(-7) mol J(-1)). (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：1607 / 1612

页数：6

共 47 条

[1] Rate constants of reactions of κ-carrageenan with hydrated electron and hydroxyl radical [J].