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Biosensors for Food Component Analysis
Published in C. Anandharamakrishnan, S. Parthasarathi, Food Nanotechnology, 2019
Praveena Bhatt, Monali Mukherjee, Uchangi Satyaprasad Akshath
Formaldehyde (HCHO) is reported to be a potent neurotoxic and carcinogenic agent (IARC Monograph, 2006). Although banned for use in food preservation, HCHO continues to be added to products like fish, milk, noodles, wine, etc. for extension of storage life of the products (Akshath and Bhatt, 2016a). A fluorescence turn-on probe using GNPs, CTAB, and fluorescein dye was developed by the author’s group recently. Extensive fluorescence quenching was observed upon interaction of fluorescein with the growth solution that consisted of CTAB, Au3+, and fluorescein dye. However, the addition of NADH led to a dose-dependent fluorescence turn-on (Figure 15.7). This behavior was successfully employed for ultrasensitive detection of formaldehyde (0.01 pg–300 pg/mL) as a function of NADH using the formaldehyde dehydrogenase enzyme.
Functionalized ionic liquids for CO2 capture under ambient pressure
Published in Green Chemistry Letters and Reviews, 2023
Carbon dioxide can be converted to methanol by a cascade enzymatic reaction involving three dehydrogenases (see Figure 4): formate dehydrogenase (FateDH) converting CO2 to formate/formic acid, formaldehyde dehydrogenase (FaldDH) converting formate/formic acid to formaldehyde, and then alcohol dehydrogenase (ADH) converting formaldehyde to methanol (108). In each of these three reactions, reduced nicotinamide adenine dinuncleotide (NADH) acts as the terminal electron donor; with suitable electron donors, dehydrogenases are able to catalyze the reverse reactions (i.e. reduction). However, these reactions are usually carried out in aqueous buffers, where the solubility of CO2 is very small. The low substrate (CO2) availability becomes the bottleneck of the overall cascade reaction. In addition, the first reaction is usually considerably slower (e.g. 30 times (109)) than its reverse reaction (i.e. the oxidation of formate to CO2), partly due to the low substrate solubility (110), but also due to low affinity of CO2 with the enzyme (109).
Formaldehyde removal in the air by six plant systems with or without rhizosphere microorganisms
Published in International Journal of Phytoremediation, 2019
Suya Zhao, Yuanyuan Zhao, Hanxiao Liang, Yuhong Su
It has been reported that many potted plants can effectively remove formaldehyde from the air, including Chlorophytum comosum (Godish and Guindon 1989; Su and Liang 2015), Epipremnum aureum (Oyabu et al. 2001, 2003; Xu et al. 2011), Aloe vera (Wolverton et al. 1989), and Hedera helix (Aydogan and Montoya 2011; Jin et al. 2013). Formaldehyde removal from indoor air involves stomatal uptake (diffusion), enzymatic metabolism in the plant (reaction), and degradation by soil microorganisms (Haslam et al. 2002; Xu et al. 2011). Formaldehyde dehydrogenase plays an important role in formaldehyde degradation by plant tissues (Ke et al.2014; Nian et al. 2013), and formaldehyde removal by some plants may be diffusion-limited rather than reaction-limited (Xu et al. 2011). The leaf area might thus be important for the removal efficiency (Sriprapat et al. 2014; Weyens et al. 2015). There is also ample literature demonstrating that plants assimilate formaldehyde more rapidly in the light than in the dark (Schmitz et al. 2000; Xu et al. 2011), which results in a higher removal efficiency during the day (Kondo et al. 1995; Schmitz et al. 2000; Kim et al. 2008). Formaldehyde level in the air is another important factor affecting the plant removal efficiency because formaldehyde can be transferred to the plant-air interface (Guieysse et al. 2008).
Roles of reactive oxygen species and antioxidant enzymes on formaldehyde removal from air by plants
Published in Journal of Environmental Science and Health, Part A, 2019
Hanxiao Liang, Suya Zhao, Kaiyan Liu, Yuhong Su
After formaldehyde in air is absorbed by plant shoots, there are two important mechanisms for its dissipation: metabolism in plants[24,25] and degradation by microorganisms in the rhizosphere solution.[26,27] Formaldehyde dehydrogenase plays a critical role in the metabolic mechanism.[28,29] Degradation in the rhizosphere may contribute to the overall degradation, but the effect may be limited because of the small contact area between potted soil and air. Therefore, formaldehyde breakdown in plants and formaldehyde transmission by plants should be the two critical processes examined to evaluate formaldehyde removal from air by plants. In addition to formaldehyde dehydrogenase, reactive oxygen species (ROS) also play a significant role in formaldehyde breakdown in plants,[30,31] although more evidence is required to verify the hypothesized redox reaction for formaldehyde breakdown.