Evaluation of Nano Zinc (ZnO) for Surface Enhancement of ATR–FTIR Spectra of Butter and Spread

Abstract

The effect of nano zinc (ZnO) particles in surface enhancement of attenuated total reflection-Fourier transform mid-infrared spectroscopy (ATR-FTIR) has been studied in butter and spread. Due to the health implications associated with consumption of trans fats, the studies also included the determination of band corresponding to trans fats of butter/ spread in the nano-zinc-treated samples. The FTIR spectra of nano-zinc-treated butter showed enhancement of bands related to (-C-O, -CH 2 -) at wave number 1,238 cm −1 and (O-C-C) band of esters at wave number 1,100 cm −1 . Shifting in wave number to 1,150 cm −1 and reduction in its peak intensity was observed with the band corresponding to 1,162 cm −1 (-C-O stretch). Reduction in peak intensity of the bands at about 2,915 and 2,850 cm −1 (C-H groups) was also observed. In the case of spread, nano zinc reduced the peak intensities of FTIR bands at 2,915 cm −1 , 2,850 cm −1 (-C-H-(CH 2 ) stretches), 1,746 cm −1 (-C═O ester), 1,465 cm −1 (-C-H (CH 2 , CH 3 )), 1,375 cm −1 (-C-H (CH 3 )) and 1,156 cm −1 (C-O, -CH 2 ). Trans fats band corresponding to ═C-H stretch (trans bonds, 966 cm −1 ), was observed in pure butter and spread. Trans fatty acids in butter and spread were quantified with the aid of calibration/ validation standards using trielaidin and triolein and by using partial least squares regression analysis. However, the band at 966 cm −1 was hindered in Zn-treated butter and reduced in Zn-treated spread.

Cheese-Matrix Characteristics During Heating and Cheese Melting Temperature Prediction by Synchronous Fluorescence and Mid-infrared Spectroscopies

“…They are considered to be sensitive, nondestructive, rapid, environmentally friendly, and noninvasive, which makes these methods suitable for online or at-line process control (Zaïdi et al 2008;Shao and He 2009;Liu et al 2010;Contreras et al 2010). In addition, these analytical tools require limited sample preparation and can be predictive Karoui et al 2008;Woodcock et al 2008;Alexandrakis et al 2010).…”

Electro‐induced Crystallization Over Amorphous Indium Hydroxide Gels Toward Ampere‐Level Current Density Formate Electrosynthesis

“…As shown in the Fourier transform infrared spectroscopy (FTIR) results (Figure 2e), the intensity of the band at 1159 cm −1 may be assigned to δ(OH) as the terminal hydroxyl group of In‐OH. [ 14 ] Moreover, the band located at 500 cm −1 corresponds well with In‐O of In‐OH, which further confirmed the presence of In‐OH bindings. [ 15 ] Moreover, the local structure of amorphous In gel was investigated through In L edge X‐ray absorption near edge structure (XANES analysis (Figure 2f), where the main features of In L 3 XANES was composed of two pre‐edge peaks (s 1 and s 2 ) and one peak (p 1 ) located at ≈3730, 3748, and 3761 eV, respectively.…”

Synthesis of Co 3 O 4 –ZnO mixed metal oxide nanoparticles by homogeneous precipitation method

“…In the spectrum of the as-prepared sample the bands at 1330 and 1625 cm -1 are assigned to the binding of acetate ion to zinc (II) and these disappear in case of calcined samples [48]. The band at 1249 cm -1 is due to -C-O stretching in the spectra of asprepared sample [49]. The bands at 490 and 777 cm -1 are associated with Co-O stretching and…”