Use of attenuated total reflectance infrared microspectroscopy combined with multivariate analysis to study membrane fouling

Gelaw, Tilahun K.; Güell, Carme; Ferrando, Montserrat; Lamo-Castellví, Sílvia de

doi:10.1016/j.jfoodeng.2014.06.032

Cited by 5 publications

(5 citation statements)

References 29 publications

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“…Overall, FTIR spectra for the membrane with longer polymer chain length had demonstrated higher transmittance intensity. Stronger peak intensity at 1640 cm -1 was corresponded to the symmetric stretching band of ONO2 groups, which confirm the presence of nitrate group in the synthesized membrane [30]. The other absorption band that relate to nitrate group were vs-NO2 at 1275 cm -1 and v-NO at 833 cm -1 [31].…”

Section: Figure 2 Schematic Of Lateral Flow Immunoassaymentioning

confidence: 51%

Thermal Mechanical Stretching to Imprint Pores Morphology of Nitrocellulose Membrane for Immuno-sensing Application

Khamis¹,

Low

2020

AMST

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Performance of membrane such as the lateral flow wicking time and protein binding ability are important to generate consistent results for diagnostics purposes. Different diagnostic kit need different surface properties of membrane, structures and dimension. This work evaluates the feasibility of controlling membrane pores morphology through thermal-mechanical stretching. Results shows that membrane fabricated using longer nitrocellulose (NC) polymer chain length produced smaller pores with lower porosity (56%). Thus, it took longer time of 32s to migrate the testing liquid along the membrane strip. By having higher membrane’s porosity (72.3%), the membrane synthesized using shorter NC chain length exhibited faster wicking time, which is 3 times faster (wicking time of 8s) than that of the membrane produced with longer NC chain length. In terms of the thermal-mechanical stretching effects, the stretched membranes (both uniaxial and biaxial directions) had demonstrated improved immunoassay performances compared to the unstretched membrane. Specifically, uniaxial stretching is preferable than biaxial stretching configuration, due to the great improvement of lateral wicking time (22% faster) without jeopardize the membrane protein binding capacity (only 1.7% decrement), in relative to the unstretched membrane. This study provides some interesting insight on the physical membrane modification to provide better performance in immunoassay applications.

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Section: Figure 2 Schematic Of Lateral Flow Immunoassaymentioning

confidence: 51%

Thermal Mechanical Stretching to Imprint Pores Morphology of Nitrocellulose Membrane for Immuno-sensing Application

Khamis¹,

Low

2020

AMST

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“…100 ATR-IR combined with soft independent modeling of class analogy can also be used to examine the efficiencies of different cleaning protocols applied to remove membrane fouling after membrane emulsification. 101 However, the application of chemometric methods can only interpret the spectral data as close to the real situation as possible. There are limitations that should be considered when applying these methods.…”

Section: Chemometric Approaches For Membrane-fouling Differentiationmentioning

confidence: 99%

Molecular Spectroscopic Characterization of Membrane Fouling: A Critical Review

Chen

Qian

Zhou

et al. 2018

Chem

101

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Membrane technologies have attracted growing interest in the fields of water purification and energy recovery. Membrane fouling is the bottleneck that limits the wide application of membrane-based technologies. Exploration of the fouling mechanism and the chemical composition, structure, and functions of foulants and their changes in the membrane filtration process is therefore of significant importance. Molecular spectroscopic methods are among the most efficient platform tools for characterizing membrane fouling because of their unique advantages, such as chemical identification at the molecular level, high sensitivity, and spatially temporally resolved feasibility. Here, an overview of spectroscopic and microspectroscopic approaches, including UV-vis, fluorescence, infrared, and Raman spectroscopy, for the online detection, identification, visualization, and chemical characterization of membrane fouling is provided, and their main advantages as well as limitations in membrane-fouling research are analyzed. Furthermore, future possibilities and challenges for the development of molecular spectroscopy for membrane-fouling characterization are envisaged in this critical review.

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“…However, disadvantages include the inability to obtain information about biofilm composition, the fact that these methods are labor intensive, and are based on critical specimen preparation procedures (Nguyen et al 2012). On the other hand, Fourier-transform infrared (FTIR) spectroscopy is a reliable, cheaper and quicker analytical technique (Al-Juboori and Yusaf, 2012;Amir et al 2013), suitable for the detection and identification of functional groups in organic compounds or in the biofilm layer on the membrane (Al-Degs et al 2011;Gelaw et al 2014). FTIR relies on the measurement of characteristic peaks associated with certain functional groups.…”

Section: Introductionmentioning

confidence: 99%

“…However, its application in membrane science is seldom reported. Gelaw et al (2014) used FTIR and multivariate analysis (soft independent modeling of the class analogy model; SIMCA) to investigate membrane fouling. These techniques helped them to differentiate between fouled and cleaned membrane and to determine the best cleaning protocol for removal of organic foulants.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the effect of antiscalants on membrane biofouling using FTIR and multivariate analysis

et al. 2019

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A combination of Fourier-transform infrared (FTIR) spectroscopy, multivariate analysis and conventional microbiological assays were utilized to characterize and differentiate membrane biofouling formed in the presence of antiscalants. Based on the FTIR spectra of biofouled reverse osmosis membranes obtained after incubating with antiscalants and H. aquamarina (as model microorganism), it was found that the biofouling intensity and composition was dependent on the type of antiscalants used. The growth of the bacterium was also highly affected by the type of antiscalants as shown by the colony forming unit (CFU) counts. By combining the techniques of principle component analysis (PCA) and FTIR, it was demonstrated that the biofouling was more intense and composed of proteins, polysaccharides and lipids, when polymer antiscalant was used. By applying PCA-FTIR with CFU counts, faster prediction of the effect of antiscalants on biofouling was made possible.

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Use of attenuated total reflectance infrared microspectroscopy combined with multivariate analysis to study membrane fouling

Cited by 5 publications

References 29 publications

Thermal Mechanical Stretching to Imprint Pores Morphology of Nitrocellulose Membrane for Immuno-sensing Application

Thermal Mechanical Stretching to Imprint Pores Morphology of Nitrocellulose Membrane for Immuno-sensing Application

Molecular Spectroscopic Characterization of Membrane Fouling: A Critical Review

Evaluating the effect of antiscalants on membrane biofouling using FTIR and multivariate analysis

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