Specific optical-based biosensor to rapid detection of Salmonella Typhimurium using FTIR: evaluation in natural orange juice, as an application in food products

Specific Detection of Uropathogenic Escherichia coli via Fourier Transform Infrared Spectroscopy Using an Optical Biosensor

“…This band was directly related to the structural conformation of the antibodies, 29,52−55 and the amide II band at 1548 cm −1 was attributed to in-plane N−H bending vibrations and C−N stretching vibrations (Figure 4a). 29,53,55 The amide III peak at 1243 cm −1 was attributed to the bending vibrational modes of N−H bonds and the stretching vibrational modes of C−N bonds (Figure 4a). 55 Analysis of the second-derivative FTIR spectra of the anti-PapG antibodies in the amide I region (1700−1600 cm −1 ) revealed bands related to components of the secondary structure.…”

“…Moreover, a band at 1106 cm −1 , corresponding to the stretching vibrational modes of the Si−O bonds (both bands generated by the interaction of oxygen coming in the environment with crystalline silicon), and a band at 612 cm −1 , corresponding to the stretching vibrational modes of the Si−Si bonds (Figure 5a), were observed. 29,56,57 Regarding the functional groups generated on the surface by the reaction with APTMS, characteristic bands at 1024 and 1109 cm −1 were attributed to the vibrational modes of the Si−O−Si bonds; these bands corresponded to the formation of siloxane bonds between the silanol groups of APTMS and were generated due to the thermal oxidation process. 56−59 Bands attributed to the C−N bending vibrational modes at 1310 cm −1 , C−H stretching vibrational modes at 1380 cm −1 , and Si−C bending vibration modes at 1445 cm −1 were observed, as well as a band attributed to the amino group N−H stretching vibrational mode at 1584 cm −1 .…”

“…This response involves several steps that are crucial for the fabrication of biosensors, such as the use of novel materials as substrates. 28,29 Substrates based on silicon (Si) have shown promising results in biomaterial applications (micro-and optoelectronic devices, memory chips, and sensitive biosensors) due to their semiconducting properties and biocompatibility; in addition, surface modifications and biomolecule anchoring can be easily achieved. 28 Silicon is a material that, through chemical modification of the surface through the creation of self-assembled monolayers (SAMs), can obtain interfacial properties on its surface.…”

Application of Fourier Transform Infrared Spectroscopy (FTIR) in combination with Attenuated Total Reflection (ATR) for rapid analysis of the tequila production process

“…The quality of tequila in its different step productions has been studied using Gas Chromatography (López-Ramírez et al, 2013, Arellano et al, 2008, Arrizon et al, 2006, Vallejo-Cordova et al, 2004 or High Performance Liquid Chromatography (HPLC) (Muñoz-Muñoz et al 2008, Muñoz-Rodríguez et al, 2005, Raman spectroscopy (Frausto-Reyes et al, 2005), UV-Vis spectroscopy (Contreras et al, 2010, Barbosa-García et al, 2007, and Fourier Transform Infrared spectroscopy (FTIR), in the infrared medium region (4000-650 cm −1 ) (Smyth andCozzolino, 2013, Lachenmeier et al, 2005). The FTIR spectroscopy in combination with the ATR interaction accessory, has been widely used to characterize various types of biopolymers (Arrieta-Almario, et al, 2019) as well as alcoholic and nonalcoholic beverages (Gómez-Montaño et al, 2021, Belchior et al, 2019, Lohumi et al, 2015, Silva et al, 2014, Leopold et al, 2011, Karoui et al, 2010, Llario et al, 2006, Paradkar et al, 2002. FTIR spectroscopy features the following advantages: fast response to obtaining spectra, for the analysis it is only needed a small amount of the sample, it is low-cost equipment, it has high repeatability, and often it does not require chemical agents for the preparation of the tested sample.…”

Formulation and characterization of Ciprofloxacin encapsulated liposomes: in vitro antimicrobial activity against multi drug resistant Salmonella typhi

“…2017). It is commonly known as "Typhoid fever" caused by a Gram-negative bacteria Salmonella typhi (Gómez-Montaño et al, 2021;Malik-Kale et al, 2011); a causative agent of Salmonella typhi (Azhar et al, 2019). The typhoid fever is responsible for morbidity and mortality in humans (Masuet-Aumatell et al, 2021).…”