Acylation of starch with vinyl acetate in water

被引：37

作者：

Mormann, W ^{[1
]}

Al-Higari, M ^{[1
]}

机构：

[1] Univ Siegen, FB 8, Lab Makromol Chem, D-57068 Siegen, Germany

来源：

STARCH-STARKE | 2004年 / 56卷 / 3-4期

关键词：

acetylation; vinyl acetate; base catalysis; substituent distribution;

D O I：

10.1002/star.200300238

中图分类号：

TS2 [食品工业];

学科分类号：

0832 ;

摘要：

Acetylation of different types of starch with vinyl acetate in water in the presence of a base is described. Maximum degree of substitution under these conditions is 1.1. Vinyl esters of higher homologous acids (vinyl laurate) react very slowly giving very low degrees of substitution after long reaction times. The reaction mixture is biphasic, because vinyl esters are not miscible with water. Formation of two layers reduces loss of acylating agent due to reaction with water - which is a major problem encountered for esterification with acid anhydrides or chlorides - to less than 5%. Unlike acylation of starch in DMSO with vinyl esters, the acetates of starch obtained by the method reported do not show regioselective distribution of acetyl groups within the anhydroglucose units.

引用

页码：118 / 121

页数：4

共 9 条

[1]

DEUS C, 1991, MAKROMOL CHEM, V192, P75

[2]

Dicke R., 2000, AM CHEM SOC POLYM PR, V47, P1550

[3] Analysis of side group motion in O-acetyl-starch using regioselective 2-O-acetyl-starches by means of dielectric spectroscopy [J].

Einfeldt, J ;

Kwasniewski, A ;

Klemm, D ;

Dicke, R ;

Einfeldt, L .

POLYMER, 2000, 41 (26) :9273-9281

[4] SOME ASPECTS OF THE CONTINUOUS PRODUCTION OF LOW-ACETYLATED POTATO STARCH [J].

JOOSTEN, GEH ;

STAMHUIS, EJ ;

ROELFSEMA, WA .

STARKE, 1982, 34 (12) :402-405

[5]

KLOHR EA, 2000, Patent No. 1035135

[6] FACILE PREPARATION OF STARCH TRIACETATES [J].

MARK, AM ;

MEHLTRETTER, CL .

STARKE, 1972, 24 (03) :73-+

[7]

MEZYNSKI L, 1992, Patent No. 159476

[8]

Tuschoff JV., 1962, US Patent, Patent No. [3 022 289, 3022289]

[9] THE ACYLATION OF CORN STARCH, AMYLOSE AND AMYLOPECTIN [J].

WOLFF, IA ;

OLDS, DW ;

HILBERT, GE .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1951, 73 (01) :346-349

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