Comparison of methods of zeta potential and residual turbidity of pectin solutions using calcium sulphate/aluminium sulphate as a precipitant
| Autor: | Vladimir Filipović, Tatjana Kuljanin, Violeta Knezevic, Milica Nićetin, Biljana Lončar |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
food.ingredient
Pectin Chemistry General Engineering chemistry.chemical_element 04 agricultural and veterinary sciences 010501 environmental sciences Calcium Residual 040401 food science 01 natural sciences residual turbidity Aluminium sulphate zeta potential 0404 agricultural biotechnology food lcsh:Technology (General) Zeta potential lcsh:T1-995 calcium sulphate/aluminium sulphate Turbidity 0105 earth and related environmental sciences Nuclear chemistry |
| Zdroj: | Acta Periodica Technologica, Vol 2017, Iss 48, Pp 177-185 (2017) |
| ISSN: | 1450-7188 |
| Popis: | The affinity of calcium ion binding from CaO used in the most common process of purification of sugar beet juice is relatively low. Therefore, large amounts of this compound are required. This paper presents the theoretical basis of a novel sugar beet juice purification method based on the application of the binary system CaSO4/Al2(SO4) . In order to monitor the process of coagulation and precipitation of pectin in the presence of CaSO4/Al2(SO4)3, two methods were compared: measurement of the zeta potential and of residual solution turbidity. The zeta potential of pectin solution was determined by electrophoretic method, while the residual turbidity was determined by spectrophotometry. Two model solutions of pectin (0.1 % w/w) were investigated. Studies were performed with 10 different concentrations of the binary solution CaSO4/Al2(SO4)3 (50 - 500 g dm-3). The amount of the precipitant CaSO4/Al2(SO4)3 (1:1 w/w) needed to achieve the minimum solution turbidity and charge neutralization of pectin particles (zero zeta potential) were measured and compared. Colloidal destabilization occurred before a complete neutralization of the surface charge of pectin particles (zeta potential ~ 0 mV). Optimal quantities (490 - 705 mg g-1 pectin) of the applied binary mixture, were obtained using both methods. This is much lower than the amount of CaO that is commonly used in the conventional process of sugar beet juice purification (about 9 g• g-1 pectin). The use of these precipitants could be important from both economic and environmental point of view. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. TR 31055] |
| Databáze: | OpenAIRE |
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