Carboxymethylation of cashew tree exudate polysaccharide

被引：146
作者：
Silva, DA
de Paula, RCM
Feitosa, JPA
de Brito, ACF
Maciel, JS
Paula, HCB
机构：
[1] Univ Fed Ceara, Dept Quim Organ & Inorgan, BR-60455760 Fortaleza, Ceara, Brazil
[2] Univ Fed Ceara, Dept Quim Analit & Fis Quim, BR-60455760 Fortaleza, Ceara, Brazil
来源：
CARBOHYDRATE POLYMERS | 2004年 / 58卷 / 02期
关键词：
Anacardium occidentale; cashew gum; carboxymethylation; polymer modification; derivative;
D O I：
10.1016/j.carbpol.2004.06.034
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Cashew tree gum was carboxymethylated in aqueous alkaline medium using monochloroacetic acid (MCA) as etherifying agent. The effects of reaction parameters such as alkali concentration, MCA/cashew gum (CG) ratio and temperature on reaction yield and degree of substitution (DS) were investigated. Products were characterized by C-13 nuclear magnetic resonance, infrared Fourier transform spectroscopy, gel permeation chromatography and flow capillary viscosity. Carboxymethyl gum samples with DSs between 0.10 and 2.21 were prepared. The reaction yield was in the range of 31-70%. The best MCA efficiency towards production of carboxymethylated macromolecules was obtained in 5.5 M sodium hydroxide concentration, 55degreesC, 3 h reaction time and 1:1 MCA/CG molar ratio. Degradation of the chain length of the starting material during carboxymethylation occurred with intensity dependent on reaction conditions. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码：163 / 171
页数：9
相关论文
共 18 条
[1]   Optimization of a process for preparing carboxymethyl cellulose from water hyacinth (Eichornia crassipes) [J].
Barai, BK ;
Singhal, RS ;
Kulkarni, PR .
CARBOHYDRATE POLYMERS, 1997, 32 (3-4) :229-231
[2]   A comparative account of conditions for synthesis of sodium carboxymethyl starch from corn and amaranth starch [J].
Bhattacharyya, D ;
Singhal, RS ;
Kulkarni, PR .
CARBOHYDRATE POLYMERS, 1995, 27 (04) :247-253
[3]   Synthesis and preliminary characterisation of charged derivatives and hydrogels from scleroglucan [J].
de Nooy, AEJ ;
Rori, V ;
Masci, G ;
Dentini, M ;
Crescenzi, V .
CARBOHYDRATE RESEARCH, 2000, 324 (02) :116-126
[4]   Composition and rheological properties of Albizia lebbeck gum exudate [J].
de Paula, RCM ;
Santana, SA ;
Rodrigues, JF .
CARBOHYDRATE POLYMERS, 2001, 44 (02) :133-139
[5]   COMPOSITION AND RHEOLOGICAL PROPERTIES OF CASHEW TREE GUM, THE EXUDATE POLYSACCHARIDE FROM ANACARDIUM-OCCIDENTALE L [J].
DEPAULA, RCM ;
RODRIGUES, JF .
CARBOHYDRATE POLYMERS, 1995, 26 (03) :177-181
[6]  
Ege S. N., 1989, ORGANIC CHEM, P446
[7]   Determination of substituents distribution in carboxymethylpullulans by NMR spectroscopy [J].
Glinel, K ;
Sauvage, JP ;
Oulyadi, H ;
Huguet, J .
CARBOHYDRATE RESEARCH, 2000, 328 (03) :343-354
[8]   Experimental studies on the carboxymethylation of arrowroot starch in isopropanol-water media [J].
Kooijman, LM ;
Ganzeveld, KJ ;
Manurung, RM ;
Heeres, HJ .
STARCH-STARKE, 2003, 55 (11) :495-503
[9]   Controlled functionalization of the polysaccharide chitin [J].
Kurita, K .
PROGRESS IN POLYMER SCIENCE, 2001, 26 (09) :1921-1971
[10]   Preparation of carboxymethyl-gellan [J].
Miyamoto, K ;
Tsuji, K ;
Nakamura, T ;
Tokita, M ;
Komai, T .
CARBOHYDRATE POLYMERS, 1996, 30 (2-3) :161-164
12