The polymer characterization of putative MPs was performed through Fourier transformed infrared (FTIR) microscopy (µ-FTIR), using a Nicolet iN10 MX Infrared Imaging Microscope (Thermo Scientific, Waltham, MA, USA). The characterization was performed in reflection mode in a wavenumber range of 4000–650 cm−1. OMNIC™ Picta software (Thermo Scientific, Waltham, MA, USA) controlled the instrument. A total of 256 scans were acquired for each spectrum, with a spectral resolution of 4 cm−1. Different libraries were used for polymer identification, including HR Aldrich Polymers, HR Coatings Technology, HR Hummel Polymer and Additives, HR Industrial Coatings, HR Polymer Additives and Plasticizers, HR Rubber Compounding Materials, HR Spectra Polymers and Plasticizers, Hummel Polymer sample Library, and Polymer Laminate Films. While all the fragments were processed under µ-FTIR, only the 25% of fibers were randomly collected from the filters and characterized because of the high number we isolated from sediment samples. The polymer composition of the other fibers was assessed through the application of the fluorophore, the 1-pyrenebutyric acid N-hydroxysuccinimidyl ester (PBN). Indeed, a recent study confirmed the use of PBN as a rapid, simple, cost-effective, and highly efficient detection method for the identification of different plastic polymers (Lee and Chae 2021 (link)).
Nicolet in10 mx infrared imaging microscope
Manufactured by Thermo Fisher Scientific
Sourced in United States
The Nicolet iN10 MX Infrared Imaging Microscope is a laboratory instrument designed for infrared (IR) spectroscopic imaging. It provides high-resolution spatial and spectral data for analyzing samples at the microscopic level.
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3 protocols using nicolet in10 mx infrared imaging microscope
1
Polymer Characterization of Microplastics
2
ATR-FTIR Imaging for Material Analysis
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Mid Infrared spectroscopy measurements were carried out on a thin film in the ATR (Attenuated Total Reflectance) mode on a Thermo Scientific Nicolet iN10 MX Infrared Imaging Microscope. This apparatus is equipped with a microscope allowing micro-FTIR measurements. Samples were placed without preparation on the stage of FTIR imaging system and were analyzed using a liquid nitrogen-cooled Mercury Cadmium Tellurite (MCT) detector. The mapping area had a size of 160 mm  160 mm, and the images were acquired with a pixel size of 20 mm with 4 cm À1 resolution and 64 scans in the wave number range of 4000e675 cm À1 , indicating that 64 spectra (8  8) were involved in an ATR/FTIR image. The MIR spectrometer was situated in an air-conditioned room (21 C) and air was taken as reference for the background spectrum before each map. Between maps, the ATR accessory was cleaned with ethanol solution, enabling to dry the ATR. Cleanliness was verified by collecting a background spectrum and comparing to the previous background spectrum. The analyzed depth is wavelength dependent and is between 0.5 and 3 mm.
3
Characterization of Cinnarizine and Captisol Films
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A FTIR spectrophotometer (Two Perkin Elmer, USA) was used in combination with a crystal diamond universal attenuated total reflectance (UATR) to characterize pure CIP and pure CA as well as the BLK and DL films. Samples were placed to cover the crystal and the metal tip turned around in order to allow intimate contact of the samples with the crystal.
Spectra were recorded in transmission mode between 650 and 4000 cm -1 at a resolution of 4 cm -1 (4 scans per spectrum). A background spectrum was taken before analysing the samples to calibrate the instrument. IR mapping of the surface of the films was performed using a Nicolet™ iN™ 10 MX Infrared Imaging Microscope (Thermo Fisher Scientific, USA) equipped with OMNIC™ Picta™ to investigate the chemical distribution of materials within the polymeric films. Liquid nitrogen was poured into the system to analyse the samples with cooled detector in the measurement range 4000-650 cm -1 and spectra were collected in reflection mode with 3s collection time. For each spectrum, 70 spots and 16 scans were combined. Four characteristic peaks for the films (CA-BLK and CA-DL) were selected as spectral markers of pure CA.
Spectra were recorded in transmission mode between 650 and 4000 cm -1 at a resolution of 4 cm -1 (4 scans per spectrum). A background spectrum was taken before analysing the samples to calibrate the instrument. IR mapping of the surface of the films was performed using a Nicolet™ iN™ 10 MX Infrared Imaging Microscope (Thermo Fisher Scientific, USA) equipped with OMNIC™ Picta™ to investigate the chemical distribution of materials within the polymeric films. Liquid nitrogen was poured into the system to analyse the samples with cooled detector in the measurement range 4000-650 cm -1 and spectra were collected in reflection mode with 3s collection time. For each spectrum, 70 spots and 16 scans were combined. Four characteristic peaks for the films (CA-BLK and CA-DL) were selected as spectral markers of pure CA.
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