I have carried out a process of cationization, following materials have been used.
Na2SO4, Na3PO4 up to 10 gm with 15 gm of starch.
Similarly used 3gm of tetra methyl ammonium bromide as cationization agent.
the process was carried out in Alcoholic solution.
However when i measure the zeta potential the value is not more 3mV or around -1.
Why it does not cationize.
I need urgent help in this regard
thank you
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An aqueous alcoholic alkaline process for cationization of normal, waxy and high amylose starches from legume, cereal, tuber and root
Abstract
A starch cationization process comprises suspending the starch in an aqueous alcoholic alkaline solvent containing a critical level of water (starch to water ratio 1:0.5 to 3:1), heating the reaction mixture for 10 minutes at 30-80 °C, adding a cationizing reagent such as 3-chloro-2-hydroxypropyl-trimethylammonium chloride, heating for 1-24 hours at 30-80 °C, neutralizing, centrifuging, washing by organic solvent and drying of the cake to yield cationic starches with degrees of substitution of 0.01 to 0.12. Recycling of reagents comprises of either direct addition of ion exchange resin or recovering of catonizing reagent by ion exchange column, and the solvent by distillation. Pin milling the dry starch of certain species such as legumes increases the starch damage for enhancing the cationizing reaction rates.
Classifications
C08B31/125 Ethers having alkyl or cycloalkyl radicals substituted by heteroatoms, e.g. hydroxyalkyl or carboxyalkyl starch having a substituent containing at least one nitrogen atom, e.g. cationic starch
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