Pectin and galacturonic acid from citrus wastes

University essay from Högskolan i Borås/Institutionen Ingenjörshögskolan

Abstract: In this work an investigation to find new method of extraction of pectin from orange peel with shortening time of extraction is carried out. Pectin was extracted from dried orange peel at higher temperature by employing stainless steel reactors. In this investigation the effect of extraction conditions (temperature: 120, 150, 200°C; extraction time: 5, 15, 30 min) with sulphuric acid, on the yield and purity of citrus pectin was performed. Moreover, optimizing other methods of extraction and analyzing of pectin is tested. In addition, effect of adding special reagent such as Sodium polyphosphate to extract solvent examined. Furthermore, two different acids are used for extraction and the results are compared as described. Pectin is solubilized by HCl and H2SO4 at different concentrations, retention time and temperature. The effect of extraction conditions (pH: 1.5 to 2; temperature: 80 to 90°C; extraction time: 1 to 3 hours) with sulphuric acid, on the yield and purity of citrus pectin was carried out. The solubilized pectin is precipitated from the solution by using organic solvents such as 2-propanol and ethanol and then analysis was done with different methods such as carbozole and meta-hydroxy-diphenyl method. A same test was run for hydrochloric acid and comparison between them was done.

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