PerkinElmer Software -First take a background spectrum with the empty tube inside the FTIR spectrometer.-This will automatically save a background transmittance. Add 2-3 drops of HCl to the tube and reinsert it into the FTIR. In the top left corner set the wavenumber from 3500 cm-1 to ...
peaks 标记峰值 标记吸收峰的纵 横坐标值 Clear All Peak Labels 清除峰值标记 Add/Edit Text 加入/编辑文字 四 PROCESS 光谱处理菜单 Undo 取消 Date turn-up 专家系统光谱处理 可包括基线校正 平滑处理和扣空白 Absorbance 转换为吸光度 3 Transmittance 转换为透过率 Kubelka-Munk K-M 漫反射校正转换 Convert ...
1. Introduction Characterized by wavelengths longer than the mid-infrared region, the far-infrared region is also referred to as the terahertz region. In recent years, this region has been used to evaluate crystal polymorphs for pharmaceuticals and semiconductor device materials, as well as for arch...
Table 1 List of integrated peaks, integration limits, and baseline points. Full size table Statistical analysis All statistical analyses and visualizations were performed using OriginPro 2017 SR2 and SPPS statistics for Windows, version 22.0 (IBM Corp., NY, USA). Shapiro–Wilk test and Kolmogrov–...
The peaks, which are also called absorbance bands, correspond with the various vibrations of the sample’s atoms when it’s exposed to the infrared region of the electromagnetic spectrum. For mid-range IR, the wave number on the infrared spectrum is plotted between 4,000 to 400 cm-1. The...
Full size table Figure 2 shows the standardized infrared spectra of thyroid patients with and without malignant tumor metastasis from 500 to 4000 cm-1. There are common infrared peaks at 1080, 1243, 1314, 1400, 1455, 1540, 1647, 2867, 2931, and 2959 cm-1. The infrared spectra of serum ...
Based on the variable importance of projection (VIP) scores, the ATR-FTIR peaks as 3000–2825, 2154–2150, 1780–1712, 1487–2483, 1186–1126, 1107–1097, and 1012–949 cm−1 were identified to be the most related to PV and TBARS on green coffee beans shelf life. ATR-FITR showed ...
The main peaks were manually selected in order to define the starting conditions for the best-fit procedure. The bestfit was then performed to determine the envelope of peaks with optimized intensities, positions, and widths, adopting 𝜒2χ2 parameter as the performance index. The choice of ...
Table 3 displays the FTIR spectrum peaks of the P. luminescens crude compound in its possible assigned functional groups. Figure 3. The FTIR analysis of bacterial crude compounds of (A) X. stockiae and (B) P. luminescens. Table 2. FTIR spectrum peaks of X. stockiae crude compound in ...
As follows from Figure 6, each of the isolated fractions (BM1 and BM2) of the matrix, in line with the analyses of their compositions (see Table 2) and chromatographic separation data (broadened peaks in Figure 6), is represented by a complex of proteins and the LPS. The heterogeneity ...