5-Aminofluorescein doped polyvinyl alcohol film for the detection of formaldehyde in vegetables and seafood. Issue 6 (20th January 2016)

• Record Type: Journal Article
• Authors: Aksornneam, L.; Kanatharana, P.; Thavarungkul, P.; Thammakhet, C.
• Is Part Of: Analytical methods. Volume 8:Issue 6(2016)
• Page Start: 1249
• Page End: 1256
• Publication Date: 2016-01-20
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/c5ay02719e
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : A simple, sensitive and low cost sensor has been developed for the determination of formaldehyde using a polyvinyl alcohol (PVA) film with entrapped 5-aminofluorescein (Fl-NH2 ). Abstract : A simple, sensitive and low cost sensor has been developed for the determination of formaldehyde using a polyvinyl alcohol (PVA) film with entrapped 5-aminofluorescein (Fl-NH2 ). The fluorescence intensity (excitation and emission wavelengths at 444 and 520 nm, respectively) of the sensing film increased with formaldehyde concentration. Under the optimal conditions, the PVA sensing film exhibited a linear response in the concentration range from 5.0 to 100.0 μg L −1 ( R 2 = 0.9978) with a detection limit of 3.820 ± 0.079 μg L −1 and a good sensor-to-sensor reproducibility (RSD < 2.5%). This sensor was applied for the analysis of formaldehyde in soak water from vegetables (9 samples), fruits (2 samples) and seafoods (2 samples). Formaldehyde was detected in only 2 samples, one from Chinese cabbage (7.5 ± 3.5 μg L −1 ) and the other from broccoli (19.1 ± 2.0 μg L −1 ), but for the rest of the soak water samples being tested formaldehyde was not detected. Good recoveries (88 ± 13% to 113.5 ± 4.7%) were obtained with spiked samples. This developed PVA sensing film is not only simple to use, by immersing into a sample solution without any sample pretreatment step, but also reusable for up to 10 times (RSD < 3.0%).