Article (Scientific journals)
Effect of extraction conditions on the yield and purity of apple pomace pectin precipitated but not washed by alcohol
Garna, Haikel; Mabon, Nicolas; Robert, Christelle et al.
2007In Journal of Food Science, 72 (1), p. 1-C9
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Abstract :
[en] A study of the influence of extraction condition (pH: 1.5 to 2; temperature: 80 to 90 degrees C; extraction time: 1 to 3 h), on the yield and purity of apple pomace pectin without elimination of impurities by alcohol washing was carried out. The alcohol precipitate yields varied from 2.9% to 8.9% depending on the pH. At pH 1.5, these yields were higher than those obtained at pH 2 contrary to the galacturonic acid purity (%w/w). Compounds other than pectins were solubilized from the cell walls of apple pomace at pH 1.5, and they were precipitated with alcohol. The apple pectins obtained from the different extraction procedures were highly methylated (54.5% to 79.5%), especially when the conditions (temperature, pH) were drastic. Similar conclusions can be drawn for the neutral sugar content that decreased at pH 1.5 (arabinose, xylose, and galactose) or at the highest temperatures and extraction times (arabinose and galactose). The phenomenon of demethylation and pectin degradation of neutral sugars chains can be observed at acid pH, and long extraction times. The presence of high quantities of mannose or fructose, glucose, and xylose in the alcohol precipitate showed that pectin precipitation with ethanol was not specific.
Disciplines :
Food science
Author, co-author :
Garna, Haikel
Mabon, Nicolas
Robert, Christelle
Cornet, Charlotte
Nott, Katherine ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Legros, Hervé
Wathelet, Bernard ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Paquot, Michel ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Language :
English
Title :
Effect of extraction conditions on the yield and purity of apple pomace pectin precipitated but not washed by alcohol
Publication date :
2007
Journal title :
Journal of Food Science
ISSN :
0022-1147
eISSN :
1750-3841
Publisher :
Blackwell Publishing
Volume :
72
Issue :
1
Pages :
C1-C9
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 21 December 2009

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