Theae nigrae folium: Comparing the analytical performance of benchtop and handheld near-infrared spectrometers

Mayr, Sophia; Schmelzer, Julia; Kirchler, Christian G.; Pezzei, C.; Beć, Krzysztof B.; Grabska, Justyna; Huck, Christian W.

doi:10.1016/j.talanta.2020.121165

Cited by 41 publications

(16 citation statements)

References 35 publications

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“…Bio-active constituents of medicinal plants and natural products have been examined with help from quantum chemical calculation of NIR spectra as well. Examples include thymol [96], rosmarinic acid [75], caffeine and L-theanine [97]. In particular, the studies of thymol supported by spectra simulation opened a new trend-setting research direction, as they yielded fundamental findings about the relationship between the specific vibrational modes and the features of PLS regression coefficients vector [96].…”

Section: Active Pharmaceutical Ingredients (Apis) In Medicinal Plantsmentioning

confidence: 99%

Near-Infrared Spectroscopy in Bio-Applications

2020

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Near-infrared (NIR) spectroscopy occupies a specific spot across the field of bioscience and related disciplines. Its characteristics and application potential differs from infrared (IR) or Raman spectroscopy. This vibrational spectroscopy technique elucidates molecular information from the examined sample by measuring absorption bands resulting from overtones and combination excitations. Recent decades brought significant progress in the instrumentation (e.g., miniaturized spectrometers) and spectral analysis methods (e.g., spectral image processing and analysis, quantum chemical calculation of NIR spectra), which made notable impact on its applicability. This review aims to present NIR spectroscopy as a matured technique, yet with great potential for further advances in several directions throughout broadly understood bio-applications. Its practical value is critically assessed and compared with competing techniques. Attention is given to link the bio-application potential of NIR spectroscopy with its fundamental characteristics and principal features of NIR spectra.

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Section: Active Pharmaceutical Ingredients (Apis) In Medicinal Plantsmentioning

confidence: 99%

Near-Infrared Spectroscopy in Bio-Applications

2020

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“…This enables the suitability of SW‐NIR spectrometers for certain purposes to be roughly estimated. On the other hand, differences between instruments, in their capacity to analyze the LW‐NIR region, are more difficult to predict and require more systematic approaches [52] …”

Section: Essential Backgroundmentioning

confidence: 99%

“…In some cases, a higher requirement of sample preparation for successful analysis by miniaturized spectrometers was reported as well. For instance, milling of plant material may significantly improve the performance of the analysis [52] …”

Section: Miniaturized Nir Spectroscopy In Practical Applicationsmentioning

confidence: 99%

“…This makes it difficult to anticipate the performance of a given spectrometer without prior systematic feasibility studies. Recently, a successful attempt to obtain more general insights into instrumental differences, expressed through the ability to analyze chemical contents with significant differences in their NIR absorption spectra, was conducted by Mayr et al [52] . Differences in the prediction of CAF and l ‐theanine contents (considered the quality parameters) in black tea by microPHAZIR and MicroNIR instruments could be associated with their sensitivity towards characteristic absorption bands of these two constituents.…”

Section: Miniaturized Nir Spectroscopy In Practical Applicationsmentioning

confidence: 99%

“…Hence, the wavenumber regions meaningful for NIR analysis performed with both devices, which, in this case, largely differed in their operational spectral regions, could be established. These accomplishments enabled the performance of each of these two spectrometers to be predicted in analyzing compounds similar to either CAF or l ‐theanine [52] …”

Section: Miniaturized Nir Spectroscopy In Practical Applicationsmentioning

confidence: 99%

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Principles and Applications of Miniaturized Near‐Infrared (NIR) Spectrometers

Beć

Grabska

Huck

2020

Chemistry A European J

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228

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This review article focuses on the principles and applications of miniaturized near‐infrared (NIR) spectrometers. This technology and its applicability has advanced considerably over the last few years and revolutionized several fields of application. What is particularly remarkable is that the applications have a distinctly diverse nature, ranging from agriculture and the food sector, through to materials science, industry and environmental studies. Unlike a rather uniform design of a mature benchtop FTNIR spectrometer, miniaturized instruments employ diverse technological solutions, which have an impact on their operational characteristics. Continuous progress leads to new instruments appearing on the market. The current focus in analytical NIR spectroscopy is on the evaluation of the devices and associated methods, and to systematic characterization of their performance profiles.

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Miniaturized Near‐Infrared Spectroscopy – The Ultimate Analytical Tool in Food and Agriculture

Grabska¹,

Beć²,

Huck³

2022

Encyclopedia of Analytical Chemistry

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Near‐infrared (NIR) spectroscopy is widely used in qualitative and quantitative analysis in various fields of applications. Compared to conventional methods of analytical chemistry, NIR spectroscopy offers many practical advantages in terms of speed, efficiency, minimal (or no) requirements for sample preparation, and the applicability to many types of samples. In the past decade, the technology of portable NIR spectrometers has rapidly advanced, which enabled new applications of this technique in science and industry where the capacity to perform spectral analysis directly on site is the key advantage. Miniaturization introduced NIR spectroscopy to practical use in analytical scenarios that were unattainable for standard laboratory equipment. The advantages of miniaturized NIR spectroscopy are particularly evident in several areas where fast and nondestructive on‐site analysis is essential – e.g. natural products and resources, and agri‐food items in particular. The sample types commonly focused in these applications are characterized by chemical complexity and diversity depending on the geographic origin, conditions of cultivation and/or storage, or harvest time. Miniaturization necessitated different engineering solutions that introduced wide diversity in the elements used for construction of portable spectrometers. Consequently, the applicability of these instruments and their performance in a given application attract keen attention. Intensive studies are devoted to method development and evaluation of miniaturized NIR sensors in a variety of analytical problems. This article discusses the essential topics related to fundamentals and applications of miniaturized NIR spectrometers, with an emphasis on practical applications in food and agriculture sectors. However, an overview of the design principles of portable NIR instruments and their relationships with analytical figures of merit are provided as well in an attempt to draw a comprehensive picture of the state‐of‐the‐art and future potential of this increasingly influential analytical technique.

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Theae nigrae folium: Comparing the analytical performance of benchtop and handheld near-infrared spectrometers

Cited by 41 publications

References 35 publications

Near-Infrared Spectroscopy in Bio-Applications

Near-Infrared Spectroscopy in Bio-Applications

Principles and Applications of Miniaturized Near‐Infrared (NIR) Spectrometers

Miniaturized Near‐Infrared Spectroscopy – The Ultimate Analytical Tool in Food and Agriculture

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