Pectin substances

There are a few data in the literature concerning ability of Penicillia to split pectin substances in comparative — taxonomic aspect. The species, which were not described previously (such as P. fellutanum, P. thomii and P. multicolor) have been found among those possessing pectolytic activity. Such species of fungi as P. wortmanii and P. velutinum were found to be potentially low active. 

Emulsions and aqueous discharges were analyzed for pH, soluble solids (°Brix), recoverable oil with the Clevenger method [19], total pectin substances as anhydrogalacturonic acid [20,... 

During a study of the biosynthesis of pectin substances, a sensitive micromethod for the assay of pectinesterase activity was developed111 that uses a biosynthetically prepared [14C] methyl-labelled pectin as the substrate after enzymic de-esterification, the substrate remaining is precipitated with an excess of methanol and, after centrifugation, the [14C]methanol present in the supernatant liquor is counted in a liquid scintillation counter in order to assess the pectinesterase activity. 

Tisza, S., Molnar-Perl, I., Friedman, M., Sass, P. (1996). Simultaneous capillary GC of acids and sugars as their silyl(oxime) derivatives Quantitation of chlorogenic acid, raffinose, and pectin substances. J. High Resolut. Chromatogr, 19, 54-58. 

The location of various pectin substances in plant tissues is well established. Pectins make up most of the middle lamella in unripe fruit and are to be found in the cell walls and in small proportion in all plant tissues. The genesis and fate of pectins in plant tissues have not been fully determined. 

Pectin substances in solution behave as typical colloids. See also Colloid Systems. Diy, purified pectins are light in color and soluble in hot water to the extent of 2-3%. The pH of pectin solutions is usually 2-3.5. 

Underlying the waxy cuticle is the primary cell wall, which is composed of two distinct layers [108]. The outermost layer is comprised primarily of pectin substances (usually designated as pectin) in the form of free pectic acid (linear polymer of (1 4)-D-galacturonic acid)... 

Kawabata, A. 1977. Studies on chemical and physical properties of pectin substances from fruits, viscoelasticity of fruit pectin gels, Memoirs Tokyo Univ. Agric., 19 166-178. 

Anderson, J.W. Chen, W.L. Plant fiber Carbohydrate and lipid metabolism. Am. J. Clin. Nutr. 32 346, 1979. Ershoff, B.H. Wells, A.F. Effect of methoxyl content on anticholesterol activity of pectin substances In the rat. Exptl. Med. Surg. 20 272, 1962. 

Com, wheat, and potato are the economic crops which are rich in starch. In addition to starch, the materials also contain protein, cellulose, and pectin substances. The feedstock with rich amylase is required in the alcohol fermentation industry. At present, the technology producing alcohol with starch feedstock is widely used in the USA and European countries. Fignre2 shows the general production process (Dong et al. 2007). 

Dietz, J, H. Rouse, A. H. 1953. A rapid method for estimating pectin substances in citrus juices. Food Res. 1953, 18, 69-111. 

The general term pectin( ) or peclic (pectin) substances now refers to previously differentiated categories, which were... 

Hydrolysis of pectin substances proceeds by the action of enzymes and in acidic or alkaline solutions. A number of native enzymes and enzymes produced by microorganisms are involved in the enzymatic hydrolysis of pectins of fruits and vegetables. Two groups of enzymes can be distinguished ... 

Pectin substances are macromolecules that consist essentially of galac-... 

Pectins are polysaccharides that contain 1,4-linked a-D-galactosyluronic acid residues. Pectin substances are present in various proportions in plants and act as an intercellular cement. Their gelling properties allow the formation of films which are often used for as fruit or vegetable coating. ... 

There is a primaiy wall under the cuticle consisting of a cellulose liamewoik and fatty-wax-pectin substances. The upper layer of the primary wall is less densely packed as compared with the inner one, due to fiber surface expansion during its growth. Cellulose fibrils in the primaiy wall are not regularly oriented. 

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