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A high performance liquid chromatographic (HPLC) analysis of octenylsuccinic anhydride (OSA) reagent and its bound and un-reacted forms in modified starch was developed. The HPLC system consisted of a C 18 column, an elution system of acetonitrile and water containing 0.1% TFA (45:55, v/v), and a diode array detector (DAD). Using the combination of HPLC-DAD and HPLC-APCI (atmospheric pressure...
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