Spectrophotometric Determination of Boron in Food Products by Ester Borate Distillation Into Curcumin

Abstract

Spectrophotometric determination of boron in food products by ester borate distillation into curcumin was studied. The sensitivity and selectivity of curcumin method were overcome by generating ester borate at proper temperature, time and pH. Boron was separated as triethyl borate by distillation in a vessel using ethanol solvent and reacted with curcumin. Distillation system reached optimum condition at temperature of 75oC and pH 5-6. Boron-curcumin complex was measured at 555 nm after 10 minutes of reaction. Separation of boron by distillation method complied with validation parameters. The standard curve was linier at concentration range of 1.2-4.8 ppm (R2=0.9995) and had molar extinction value (?) 4.7 x 105 L mol-1 cm-1 for high sensitivity level which is higher than the previous study. Percent recovery was found to be 96.09-104.92 %. Boron content in meatball and tofu products was in the range of 1.406-3.589 and 0.010-1.085 mg/kg. Ester borate distillation into curcumin has been successfully applied to the determination of boron in food products because of its high selectivity and sensitivity.

Critical Quality Control on Determination of Boron Using ICP-OES with Gravimetric Method

“…The ICP-OES with the gravimetric method has good accuracy for low, medium, and high measurement levels. Based on the data in Table 6 shows that the ICP-OES method has a high accuracy [10], [13] as the AAS [5]; UV-Vis spectrophotometry [8]; and ICP-MS [10]. Based on the precision values obtained and the previous research data presented in Table 6 and the acceptability requirements of the accuracy range, it is a critical aspect in reviewing the selection of boron analysis methods with ICP-OES.…”

“…These tests require methods that can detect at low concentrations with high precision and accuracy. The determination of boron can be carried out by the method of atomic absorption spectroscopy (AAS) [4]- [6]; UV-Vis spectrophotometer [4], [7], [8]; inductively coupled plasma-optical emission spectrometry (ICP-OES) [4], [9], [10]; inductively coupled plasma mass spectrometry (ICP-MS) [4], [9], [10], inductively coupled plasma atomic emission spectroscopy (ICP-AES) [11], [12] and microwave plasma atomic emission spectrometry (MP-AES) [6].…”