pectic acid

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Related to Polygalacturonic acid: pectic acid

d-ga·lac·tu·ron·ic ac·id

(gă-lak-tūr-on'ik as'id),
The d-isomer is an oxidation product of d-galactose, in which the 6-CH2OH group has become a -COOH group; occurs in many natural products (for example, pectins) and cell walls.
Synonym(s): pectic acid

pectic acid

(pĕk′tĭk)
n.
Any of several transparent gelatinous acids that are insoluble in water and are formed by partial or complete hydrolysis of certain esters of pectin.

pectic acid

C17H24O16, an acid derived from pectin by hydrolyzing its methyl ester group.
See also: acid
References in periodicals archive ?
Pectin- consists mainly of the partial methyl esters of polygalacturonic acid and their sodium, potassium, calcium and ammonium salts; obtained by extraction in an aqueous medium of edible plant material, usually citrus fruits or apples.
When occur woolliness incidence, the polygalacturonic acid (main component of pectin) shows reduced methylation (due to higher PME activity), without subsequently degradation of pectin (due to lower PG activity), resulting large pectin molecules with reduced methylation that gelling and can cause more free water to be bound into gel, leading to less juice content and causing woolly texture (LURIE; CRISOSTO, 2005).
Recent researches have shown that polygalacturonic acid found in pectin can reduce plasma cholesterol and sugar the most [41].
Work done on this fraction of common foods (particularly potato, garlic, ginger and red peppers) at the University of Osaka in Japan found that the pectin-like substances become soluble after restricted degradation of naturally occurring polygalacturonic acid chains with protopectinase.
Determination of the esterification degree of polygalacturonic acid.
Pectin and Cellulose are important polysaccharides constituent of plant cell walls, made of fragments of polygalacturonic acid chains, which interact with Ca2+ and Mg2+ (as the important exchanged ions with heavy metals) to form a three dimensional polymer by (-COO) 2Ca and or (-COO) 2Mg bindings as the ion exchanging bases [7].