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5. Quantitative analysis of detailed lignin monomer composition by pyrolysis-gas chromatography combined with preliminary acetylation of the samples

Author

Sonoda, Tetsuya, Ona, Toshihiro, Yokoi, Hiroaki, Ishida, Yasuyuki, Ohtani, Hajime, and Tsuge, Shin

Subjects
Chemistry, Analytic -- Quantitative, Lignin -- Analysis, Chromatographic analysis -- Usage, Phytochemistry -- Research, Plants -- Chemical analysis, Monomers -- Identification and classification, Chemistry
Abstract

Detailed quantitative analysis of lignin monomer composition comprising p-coumaryl, coniferyl, and sinapyl alcohol and p-coumaraldehyde, coniferaldehyde, and sinapaldehyde in plant has not been studied from every point mainly because of artifact formation during the lignin isolation procedure, partial loss of the lignin components inherent in the chemical degradative methods, and difficulty in the explanation of the complex spectra generally observed for the lignin components. Here we propose a new method to quantify lignin monomer composition in detail by pyrolysis-gas chromatography (Py-GC) using acetylated lignin samples. The lignin acetylation procedure would contribute to prevent secondary formation of cinnamaldehydes from the corresponding alcohol forms during pyrolysis, which are otherwise unavoidable in conventional Py-GC process to some extent. On the basis of the characteristic peaks on the pyrograms of the acetylated sample, lignin monomer compositions in various dehydrogenative polymers (DHP) as lignin model compounds were determined, taking even minor components such as cinnamaldehydes into consideration. The observed compositions by Py-GC were in good agreement with the supplied lignin monomer contents on DHP synthesis. The new Py-GC method combined with sample preacetylation allowed us an accurate quantitative analysis of detailed lignin monomer composition using a microgram order of extractive-free plant samples.

Published
2001

12. Effect of staged crestal maxillary sinus augmentation: A case series.

Author

Sonoda, Tetsuya, Yamamichi, Kensuke, Harada, Takehiro, and Yamamichi, Nobuyuki

Subjects
MAXILLARY sinus, SINUS augmentation, NASAL mucosa, ALVEOLAR process, CONE beam computed tomography, MAXILLA surgery, MAXILLARY sinus surgery, DENTAL implants, ORAL surgery
Abstract

Background: In sinus augmentation, when remaining bone height is ≤5 mm, a lateral window approach is often the preferred choice; nonetheless, patients prefer to have a less invasive approach such as crestal sinus augmentation (CSA). Prior case reports have described the use of various staged approaches of a CSA technique in cases of limited bone height. The aim of this report was to describe the results of a case series in which a two-stage CSA technique was used in patients with 4 to 6 mm of bone height.Methods: Nineteen subjects with 28 sinuses of initial vertical bone height of 4 to 6 mm were included in which a two-stage CSA technique was used in place of a lateral window approach. In the first surgery, 0.3 mL graft material was inserted into all sites. In the second surgery, 13 sites were filled with 0.2 mL graft material and remaining 15 sites were filled with 0.4 mL.Results: No damage was observed in the maxillary sinus floor membrane after first 0.2 mL filling; however, one case had Schneiderian membrane perforation after filling 0.4 mL. The average elevation height (EH) after first surgery was 5.81 ± 0.7 mm, 5.15 ± 0.91 mm before second surgery, 6.69 ± 0.89 mm with 0.2 mL filling (total 0.5 mL) and 8.11 ± 1.24 mm with 0.4 mL filling (total 0.7 mL). The thickness of maxillary sinus membrane before first surgery was 2.6 ± 2.59 mm; however, it has become 0.97 ± 1.59 mm before second surgery, with a decrease of 1.6 mm estimate.Conclusion: This case series that assessed outcomes of staged crestal maxillary sinus augmentation was an effective approach to elevating 6 or 8 mm alveolar bone height without causing major membrane perforation. However, the two-stage approach was used in the limited residual bone height (4 to 6 mm) and required two separate surgical procedures. [ABSTRACT FROM AUTHOR]

Published
2020
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24. Microstructure and Antibacterial of Thermal-sprayed Photocatalytic Coating Using Agglomerated Oyster Shell Powder from Disposed Oyster Shell and Photocatalytic Powders

Author

Kuwashima, Takayuki, primary, Yasuoka, Junichi, additional, Kawata, Hiroki, additional, Ota, Toshio, additional, Sato, Kazuhiko, additional, Kawasaki, Sakae, additional, Hirano, Takahiro, additional, Sato, Megumi, additional, Sonoda, Tetsuya, additional, Saito, Takashi, additional, Hirata, Toh-Ichi, additional, Kidoba, Yuka, additional, Sato, Naoto, additional, and Moro, Yuuetsu, additional

Published
2013
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32. Increasing fiber length and growth in transgenic tobacco plants overexpressing a gene encoding the Eucalyptus camaldulensis HD-Zip class II transcription factor

Author

Sonoda, Tetsuya, primary, Koita, Hisako, additional, Nakamoto-Ohta, Shiho, additional, Kondo, Keiko, additional, Suezaki, Tazuko, additional, Kato, Tomohiko, additional, Nagai, Kana, additional, Iida, Nanae, additional, Sato, Shigeru, additional, Umezawa, Toshiaki, additional, and Hibino, Takashi, additional

Published
2009
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