Fourier transform Raman spectroscopic studies of a novel wood pulp bleaching system

Weinstock, Ira A.; Atalla, Rajai H.; Agarwal, Umesh P.; Minor, James L.; Petty, Chris

doi:10.1016/0584-8539(93)80106-k

Cited by 22 publications

(16 citation statements)

References 8 publications

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“…In the field of paper making important insights into the understanding of photochemistry and bleaching chemistry of mechanical pulp were gained [104][105][106][107]. Furthermore solid wood modification with chemicals, e.g.…”

Section: "Modified" Cell Wallsmentioning

confidence: 99%

The potential of Raman microscopy and Raman imaging in plant research

Gierlinger

Schwanninger

2007

Journal of Spectroscopy

236

173

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To gain a better understanding on structure, chemical composition and properties of plant cells, tissues and organs several microscopic, chemical and physical methods have been applied during the last years. However, a knowledge gap exists about the location, quantity and structural arrangement of molecules in the native sample or what happens on the molecular level when samples are chemically or mechanically treated or how they respond to mechanical stress. These questions need to be answered to optimise utilization of plants in food industry and pharmacy and to understand structure-function relationships of plant cells to learn from natures unique. Advances in combining microscopy with Raman spectroscopy have tackled this problem in a non-invasive way and provide chemical and structural informationin situwithout any staining or complicated sample preparation. In this review the different Raman techniques (e.g. near infrared Fourier Transform Raman spectroscopy (NIR-FT), resonance Raman spectroscopy, surface-enhanced Raman spectroscopy) are briefly described before approaches in plant science are summarised. Investigations on structural cell wall components, valuable plant substances, metabolites and inorganic substances are included with emphasis on Raman imaging. The introduction of the NIR-FT-Raman technique led to many applications on green plant material by eliminating the problem of sample fluorescence. For mapping and imaging of whole plant organs (seeds, fruits, leaves) the lateral resolution (~10μm) of the NIR-FT technique is adequate, whereas for investigations on the lower hierarchical level of cells and cell walls the high resolution gained with a visible laser based system is needed. Examples on high resolution Raman imaging are given on wood cells, showing that changes in chemistry and orientation can be followed within and between different cell wall layers having dimensions smaller than 1 μm. In addition imaging the distribution of amorphous silica is shown on horsetail tissue, including an area scan from a cross section as well as a depth profiling within a silica rich knob of the outer stem wall.

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Section: "Modified" Cell Wallsmentioning

confidence: 99%

The potential of Raman microscopy and Raman imaging in plant research

Gierlinger

Schwanninger

2007

Journal of Spectroscopy

236

173

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“…The use of NIR-FT-Raman spectroscopy for the study of lignocellulosic materials was discussed. An application utilizing this technique to study a novel chlorinefree process for the bleaching of wood pulps was presented in detail by Weinstock et al [78]. The results from FT-Raman measurements of polyoxometalate-treated pulps were compared with those from chemical, spectroscopic and optical techniques commonly used in the pulp and paper industry.…”

Section: Specific Comments On Papers Related To Ir-microspectroscopymentioning

confidence: 98%

“…Several reports have been published which demonstrate the potential use of the microspectroscopic particle counter applied to problems associated with pulp and paper manufacturing ( S o m e r & Katon, [76, 771; Weinstock et al [78]; Sommer, [79]). …”

Section: Infrared Microspectroscopymentioning

confidence: 99%

Infrared Microspectroscopy in the Pulp and Paper-Making Industry

Durán¹,

Angelo²

1998

Applied Spectroscopy Reviews

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“…4f, unfoxed area). The "yellowing" that occurs upon exposure of these products to light arises from photochemical changes in the lignin component of the paper (Weinstock et al, 1993). Mechanical pulping results in fiber degradation and leaves a high level of residual lignin.…”

Section: C-o-c As Well As C-c-h and O-c-h Deformation Vibrations C-mentioning

confidence: 99%

Analytical and Microbiological Characterization of Paper Samples Exhibiting Foxing Stains

et al. 2015

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This work comprises the use of a multi-analytical approach combined with microbiological studies to characterize six paper samples, containing foxing stains, from the 20th century, regarding their cellulose matrix, fillers, and sizing materials, and to evaluate possible paper degradation that might have occurred during the foxing stains. Photography under different illuminations and optical microscopy were used for morphological characterization of the paper samples and foxing stains. Scanning electron microscopy coupled energy dispersive spectroscopy (SEM-EDS) was of particular importance for defining the presence of fiber disorder and disruption on the surface of some of the stains, and localized accumulations of mineral-like particles on the surface of others. SEM-EDS, attenuated total reflection Fourier transform infrared spectroscopy (ATR-FT-IR), and energy dispersive X-ray fluorescence (EDXRF) were used for the identification of mineral fillers, whereas sizing agents were analyzed using ATR-FT-IR. EDXRF results showed that no differences, within the standard deviation, were found in iron and copper contents between the foxed and unfoxed areas. Fungi belonging to the genus Penicillium spp. were found in all the paper samples. Unfoxed areas presented lower contamination than the foxed areas.

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Fourier transform Raman spectroscopic studies of a novel wood pulp bleaching system

Cited by 22 publications

References 8 publications

The potential of Raman microscopy and Raman imaging in plant research

The potential of Raman microscopy and Raman imaging in plant research

Infrared Microspectroscopy in the Pulp and Paper-Making Industry

Analytical and Microbiological Characterization of Paper Samples Exhibiting Foxing Stains

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