A highly sensitive and selective "turn off-on" fluorescent sensor based on Sm-MOF for the detection of tertiary butylhydroquinone. (July 2020)

• Record Type: Journal Article
• Authors: Liu, Xinfang; Zhang, Xiaoyu; Li, Rongfang; Du, Liyong; Feng, Xun; Ding, Yuqiang
• Is Part Of: Dyes and pigments. Volume 178(2020)
• Publication Date: 2020-07
• Subjects: Fluorescence detection -- Tertiary butylhydroquinone (TBHQ) -- Edible oils -- Samarium organic metal framework -- Energy transfer; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2020.108347
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: A "turn off-on" samarium-metal-organic-framework (Sm-MOF ) fluorescence sensor for detection of tertiary butylhydroquinone (TBHQ) in edible oil was designed. It was found that the fluorescence of Sm-MOF was quenched in the presence of Fe 3+ ion by forming Sm-MOF @Fe 3+ complex (turn off), then it was recovered after adding TBHQ (turn on) due to the competitive formation of TBHQ@Fe 3+ and release of Sm-MOF . Under the optimum Fe 3+ concentration, the fluorescence "turn off-on" approach exhibited superior selectivity and sensitivity, wide linear range (0–120 μg/mL) and low detection limit (5.6 ng/mL) toward TBHQ. The fluorescence recovery selectivity of TBHQ over other synthetic phenolic antioxidants was attributed to the synergistic effect of high EHOMO value and a small space steric hindrance. TBHQ spiked in edible oil was quantitatively detected by the standard curve method with recoveries of 101.2%–103.0%, suggesting that the "turn off-on" approach has potential application for TBHQ detection in oil-containing foods. Graphical abstract: The orange fluorescence of Sm-MOF was quenched in the presence of Fe 3+ by forming Sm-MOF @Fe 3+ complex (turn off), then it was recovered after adding TBHQ (turn on) due to the competitive formation of TBHQ@Fe 3+ and release of Sm-MOF . The highly selective and sensitive "turn off-on" process provides a new approach for the detection of TBHQ in edible oil or oil-containing foods. Image 1 Highlights: A Sm-MOF was synthesized via a one-step hydrothermal method. The fluorescence of Sm-MOF was quenched by Fe 3+ . The fluorescence of Sm-MOF@Fe 3+ was recovered by TBHQ. The fluorescence recovery selectivity and detection mechanism was analyzed. The "turn off-on" approach was used for TBHQ detection in edible oil.