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Title: Sequential injection system for simultaneous determination of sucrose and phosphate in cola drinks using paired emitter-detector diode sensor
Authors: Phoonthawee Saetear
Kittiwut Khamtau
Nuanlaor Ratanawimarnwong
Kamonthip Sereenonchai
Duangjai Nacapricha
Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs.
Mahidol University
Srinakharinwirot University
Thammasat University
Keywords: Chemistry
Issue Date: 24-Jun-2013
Citation: Talanta. Vol.115, (2013), 361-366
Abstract: This work presents the simultaneous determination of sucrose and phosphate by using sequential injection (SI) system with a low cost paired emitter-detector diode (PEDD) light sensor. The PEDD uses two 890 nm LEDs. Measurement of sucrose in Brix unit was carried out based on the detection of light refraction occurring at the liquid interface (the schlieren effect) between the sucrose solution and water. Phosphate was measured from the formation of calcium phosphate with turbidimetric detection. With careful design of the loading sequence and volume (sample - precipitating reagent - sample), simultaneous detection of sucrose and phosphate was accomplished with the single PEDD detector. At the optimized condition, linear calibrations from 1 to 7 Brix sucrose and from 50 to 200 mg PO43-L-1were obtained. Good precision at lower than 2% RSD (n=10) for both analytes with satisfactory throughput of 21 injections h-1was achieved. The method was successfully applied for the determination of sucrose and phosphate in cola drinks. The proposed method is readily applicable for automation and is found to be an alternative method to conventional procedures for on-line quality control process in cola drink industry. © 2013 Published by Elsevier B.V.All rights reserved.
ISSN: 00399140
Appears in Collections:Scopus 2011-2015

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