An experimental study has been conducted to determine the combined effects of different extraction conditions and precipitation method on the yield and quality of high methoxyl pectin from lemon peels. Pectin was extracted using different mineral acids (HCl, HNO3 and H2SO4) at four concentration levels (0.025; 0.05; 0.1 and 0.2 m), at 70 °C for 4 h. The soluble pectin was precipitated by iso-propanol or by an aluminium sulphate, Al 2(SO 4) 3, solution at pH 4. The extraction with HCl and HNO 3, at the highest concentrations investigated, followed by aluminium precipitation led to the best results in terms of yield (22-25%), quality and gelling power of pectin with a remarkable decrease of alcohol consumption as compared to the alcoholic precipitation under the same extracting conditions.
Effect of different extraction and precipitation methods on yield and quality of pectin
SEGGIANI, MAURIZIA;PUCCINI, MONICA;
2009-01-01
Abstract
An experimental study has been conducted to determine the combined effects of different extraction conditions and precipitation method on the yield and quality of high methoxyl pectin from lemon peels. Pectin was extracted using different mineral acids (HCl, HNO3 and H2SO4) at four concentration levels (0.025; 0.05; 0.1 and 0.2 m), at 70 °C for 4 h. The soluble pectin was precipitated by iso-propanol or by an aluminium sulphate, Al 2(SO 4) 3, solution at pH 4. The extraction with HCl and HNO 3, at the highest concentrations investigated, followed by aluminium precipitation led to the best results in terms of yield (22-25%), quality and gelling power of pectin with a remarkable decrease of alcohol consumption as compared to the alcoholic precipitation under the same extracting conditions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
