Application of ultrasonic-assisted and solid phase extraction using MWCNTs sorbent for formaldehyde analysis in food samples

Name: Nutnicha Sakornkhum

Organization : Rajamangala University. Faculty of Science and Technology

Name: Paitoon Sub-Udom

Organization : Rajamangala University. Faculty of Science and Technology

Name: Netnapit Kaewchuay

Organization : Rajamangala University. Faculty of Science and Technology

Email : netnapit_k@rmutt.ac.th

keyword: Solid-phase extraction

LCSH: Formaldehyde -- Analysis

LCSH: Food contamination -- Analysis

LCSH: Ultrasonic waves

Abstract: This study is focused on investigating sample preparation techniques for the extraction of formaldehyde in food samples. Ultrasonic-assisted extraction (UAE) and solid-phase extraction (SPE) were chosen as techniques for extracting formaldehyde. Under the optimum conditions, a sample (shiitake mushrooms) of 0.1 g in acetic acid as a solvent using a power rate of 80% of probe 6 mm for 10 minutes was performed successfully for extraction in the UAE. Then, the SPE technique was used for extraction and preconcentration. Multi-walled carbon nanotubes were synthesized and used as sorbents in SPE. Formaldehyde was eluted with eluent, 2 mL of acetonitrile-methanol, from SPE and was derivatized with Nash’s reagent before analysis by a UV-visible spectrophotometer. Good linearity (R² = 0.998) was achieved in concentration ranges of 0.25 to 10.0 mg kg−1, with limits of detection and quantitation at 0.08 mg kg−1 and 0.27 mg kg−1, respectively. The method demonstrated good accuracy, with recoveries ranging from 98.16 ± 0.007 to 108.34 ± 0.015%, and good precision, with RSDs ranging from 1.29% to 3.65%. Formaldehyde concentrations detected in shiitake mushrooms, tremella mushrooms, and jellyfish were 0.15 ± 0.02, 0.16 ± 0.02, and 0.13 ± 0.02 mg kg−1, respectively. This simple and cost-effective method uses minimal sample and solvent, making it suitable for food analysis.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2025

Modified: 2025-10-22

Issued: 2025-10-22

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BibliograpyCitation : In The Chemical Society of Thailand under the Patronage of Professor Dr. Her Royal Highness Princess Chulabhorn Krom Phra Srisavangavadhana and Suranaree University of Technology. Institute of Science. School of Chemistry. Pure and Applied Chemistry International Conference 2025 (PACCON 2025) (pp.59-65). Bangkok : The Chemical Society of Thailand under the Patronage of Professor Dr. Her Royal Highness Princess Chulabhorn Krom Phra Srisavangavadhana in association with the School of Chemistry, Institute of Science, Suranaree University of Technology, 2025

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