Chiang Mai Journal of Science

Flow Injection System with Amperometric Detection for Determination of Iodine Value of Vegetable Oils

Paper Type	Contributed Paper
Title	Flow Injection System with Amperometric Detection for Determination of Iodine Value of Vegetable Oils
Author	Thidarat Kruatian, Kritsana Jitmanee* and Jaroon Jakmunee
Email	kritsana.j@cmu.ac.th
Abstract: A flow injection (FI) system with amperometric detection has been proposed for the determination of iodine value (IV) of vegetable oils. An aliquot of a sample of 0.010-g was treated with 1.00 mL of Hanus solution for 1 minute before adding with potassium iodide solution to generate tri-iodide. Then, the solution was injected into the FI-amperometric system to detect the tri-iodide by using a screen-printed carbon electrode (SPCE) at an applied potential of 750 mV (vs Ag/AgCl). The system was optimized to provide high sensitivity by utilizing various concentration of Hanus solutions for constructing a calibration graph, which was linear in a range of 40-100 μM (r2 = 0.997) with limit of detection of 3.6 IV. An injection frequency of 60 h-1 was achieved by using 2.5 mL/min flow rate. A good repeatability of injection (0.20-0.58 %RSD, n=11) and good reproducibility for replicated analysis of 5 aliquots of a sample (1.07-1.36 %RSD) were demonstrated. The proposed method was successfully applied to vegetable oil samples with low to high iodine value. The proposed method offers high sample throughput and low reagent consumption.
Start & End Page	557 - 567
Received Date	2020-05-20
Revised Date
Accepted Date	2020-07-26
Full Text	Download
Keyword	amperometric detection, flow injection analysis, iodine value, vegetable oil, hanus method
Volume	Vol.48 No.2 (March 2021)
DOI
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