In Situ IR Transmission Spectroscopic Observation and Kinetic Analyses of Initial Stage of the Maillard Reaction as a Simulated Formation Process of Humic Substances

Nakaya, Yuki; Nakashima, Satoru

doi:10.1246/cl.160596

Cited by 6 publications

(8 citation statements)

References 9 publications

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“…7. They showed water absorptions around 772, 1635, 2110, and 3340 cm −1 and an absorption around 2350 cm −1 due to CO 2 on the optical path in the spectrometer [21,28,31]. The spectrum (a) also showed goethite absorption peaks at 790 cm −1 and 891 cm −1 .…”

Section: Atr-ir Measurements Of the Reactants On Goethitementioning

confidence: 97%

“…3 ) and the peaks at 1330 cm −1 and 1442 cm −1 originated from methyl group (>CH 2 ) [21,37,38]. The peaks at 1410 cm −1 and 1630 cm −1 [Fig.…”

Section: Figmentioning

confidence: 99%

“…8(R)] can be due to C=O stretching of COOH group [39,40]. The ribose peaks at 1044, 1088, 1120, and 1156 cm −1 [Fig .8(R+g, R, rib)] can be possibly originated from C-O bonds [21,41]. Some reported peaks by ribose can be recognized at 1010, 1226, 1246, 1348, and 1422 cm −1 [Fig.…”

Section: Figmentioning

confidence: 99%

“…Therefore, the Maillard reaction has been studied in a few geochemistry researches for understanding time scales, amounts and properties of the reaction and products (e.g. Abelson (1978) [20]; Yamamoto and Ishiwatari (1989) [19]; Nakaya and Nakashima (2016) [21]; Nakaya et al (2018) [22]). Some experimental works studied changes of bulk solution chemistry during the Maillard reaction in the presence of clay minerals (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, adsorption onto goethite at room temperature of the simulated Maillard reaction reactants is monitored by attenuated total reflection infrared (ATR-IR) spectroscopy. As reactants for the simulated Maillard reaction forming humic-like substances, glycine and ribose (0.1 mol L −1 ) were selected here based on our previous researches [21,22].…”

Section: Introductionmentioning

confidence: 99%

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Spectroscopic Study of Effects of Goethite Surfaces on the Simulated Maillard Reaction Forming Humic-like Substances

Nakaya

Okada

Ikuno

et al. 2018

e-J. Surf. Sci. Nanotech.

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Progress of the simulated Maillard reaction for 0.1 mol L −1 glycine and ribose mixture solution at 80 • C for 0-7 days forming humic-like substances in the presence/absence of goethite was examined by ultraviolet-visible (UV-VIS) spectroscopy. 254 nm and 420 nm absorption intensities for the product solutions with goethite increased faster than for those without goethite, indicating enhancement of the reaction progress in the presence of goethite in several days at 80 • C. Adsorption onto goethite of reactants of the reaction were directly monitored by attenuated total reflection infrared (ATR-IR) spectroscopy with thin layers of goethite on the ATR crystal (ZnSe). IR spectral changes with time for the reactant solution (0.1 mol L −1 glycine and ribose mixture solution) on the goethite layer suggested fast adsorption within a few hours at room temperature of oxygenated components of glycine onto positively charged goethite surface. In situ heating ATR-IR kinetic measurements of humic-goethite interfaces will be useful for examining mechanisms of surface processes leading to reaction enhancement.

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Section: Atr-ir Measurements Of the Reactants On Goethitementioning

confidence: 97%

“…3 ) and the peaks at 1330 cm −1 and 1442 cm −1 originated from methyl group (>CH 2 ) [21,37,38]. The peaks at 1410 cm −1 and 1630 cm −1 [Fig.…”

Section: Figmentioning

confidence: 99%