The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Yeonhee Lee - One of the best experts on this subject based on the ideXlab platform.
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HPLC and ToF‒SIMS Analyses of Toxicodendron Vernicifluum Tree Sap Mixed with Other Natural Lacquers.
Molecules (Basel Switzerland), 2021Co-Authors: Seung Wook Ham, Yeonhee LeeAbstract:Lacquer sap has been used by humans from antiquitywhen it was treated as a luxury item because of its desirable physical properties. In modern times, although access barriers are lower, lacquer is still considered to be rare and valuable. Thus, low quality, inexpensive Vietnamese and Myanmarese lacquers and cashew nutshell liquid are frequently added to the costly Toxicodendron Vernicifluum lacquer sap from Korea, China, and Japan. However, these blended lacquers can diminish the quality of artisan works. The Toxicodendron Vernicifluum lacquer saps mixed with other natural lacquers were characterized using time-of-flight secondary-ion mass spectrometry (ToF-SIMS) and high-performance liquid chromatography (HPLC). ToF-SIMS provided the chemical structure of the lacquer monomer, copolymerized dimers, trimers, etc. HPLC provided quantitative analysis of the components of a randomly mixed lacquer. These techniques can be used to control the quality of commercial lacquer sap for the Asian lacquer industry and the traditional conservation of ancient objects.
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hplc and tof sims analyses of Toxicodendron Vernicifluum tree sap mixed with other natural lacquers
Molecules, 2021Co-Authors: Seung Wook Ham, Yeonhee LeeAbstract:Lacquer sap has been used by humans from antiquitywhen it was treated as a luxury item because of its desirable physical properties. In modern times, although access barriers are lower, lacquer is still considered to be rare and valuable. Thus, low quality, inexpensive Vietnamese and Myanmarese lacquers and cashew nutshell liquid are frequently added to the costly Toxicodendron Vernicifluum lacquer sap from Korea, China, and Japan. However, these blended lacquers can diminish the quality of artisan works. The Toxicodendron Vernicifluum lacquer saps mixed with other natural lacquers were characterized using time-of-flight secondary-ion mass spectrometry (ToF-SIMS) and high-performance liquid chromatography (HPLC). ToF-SIMS provided the chemical structure of the lacquer monomer, copolymerized dimers, trimers, etc. HPLC provided quantitative analysis of the components of a randomly mixed lacquer. These techniques can be used to control the quality of commercial lacquer sap for the Asian lacquer industry and the traditional conservation of ancient objects.
Tetsuo Miyakoshi - One of the best experts on this subject based on the ideXlab platform.
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materials and provenance determination of lacquerware from the ryukyu kingdom period by pyrolysis gas chromatography mass spectrometry and 87sr 86sr isotope ratio
Journal of Archaeological Science: Reports, 2019Co-Authors: Rika Nakagawa, Shun'ichi Nakai, Tetsuo Miyakoshi, Takayuki HondaAbstract:Abstract Three wood chips found in a wooden coffin discovered in the Mumujyana graves of the Ryukyu Kingdom period were analyzed by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS), and the 87Sr/86Sr isotope ratio of one piece was measured by multi-collector inductively coupled plasma mass spectrometry to determine the materials used to produce the lacquerware and their provenance. Results from the derivative Py-GC/MS indicate that the lacquer was produced from sap of both Toxicodendron Vernicifluum, which grows in eastern Asia, and Toxicodendron succedaneum, which grows in southeastern Asia. The 87Sr/86Sr isotope ratios of the film layer and wooden base of one large chip, which is considered to be a stripped piece of the wooden coffin, were
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Materials and provenance determination of lacquerware from the Ryukyu Kingdom period by pyrolysis-gas chromatography/mass spectrometry and 87Sr/86Sr isotope ratio
Journal of Archaeological Science: Reports, 2019Co-Authors: Rika Nakagawa, Shun'ichi Nakai, Tetsuo Miyakoshi, Takayuki HondaAbstract:Abstract Three wood chips found in a wooden coffin discovered in the Mumujyana graves of the Ryukyu Kingdom period were analyzed by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS), and the 87Sr/86Sr isotope ratio of one piece was measured by multi-collector inductively coupled plasma mass spectrometry to determine the materials used to produce the lacquerware and their provenance. Results from the derivative Py-GC/MS indicate that the lacquer was produced from sap of both Toxicodendron Vernicifluum, which grows in eastern Asia, and Toxicodendron succedaneum, which grows in southeastern Asia. The 87Sr/86Sr isotope ratios of the film layer and wooden base of one large chip, which is considered to be a stripped piece of the wooden coffin, were
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Analysis of Sakhalin-Ainu lacquerwares by pyrolysis gas chromatography/mass spectrometry
Journal of Archaeological Science: Reports, 2018Co-Authors: Soichiro Idei, Takayuki Honda, Tetsuo MiyakoshiAbstract:Abstract Six pieces of Sakhalin-Ainu lacquerware were analyzed by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) to determine the lacquer source. In the direct Py-GC/MS, 3-heptylphenol (P7) and 3-pentadecylphenol (P15) were detected in the mass chromatograms at m/z = 108, and palmitic acid and stearic acid were detected at m/z = 60 in the mass chromatograms of all pieces of Sakhalin-Ainu lacquerware, implying that drying oil was added to sap collected from a Toxicodendron Vernicifluum lacquer tree to prepare the lacquer. The energy dispersive X-ray fluorescence results showed that the component ratio of base ground powder was similar to that of Aizu and Joboji lacquerwares, and the Fourier transform infrared spectroscopy results showed that Sakhalin-Ainu lacquerwares used persimmon tannin in the base ground powder like Joboji lacquerwares, suggesting that Sakhalin-Ainu lacquerwares were produced in Joboji, Japan. Based on these results, the production district, history, and culture of the Sakhalin-Ainu lacquerwares are discussed.
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Analysis of Japanese Jōmon period red lacquerwares by pyrolysis gas chromatography/mass spectrometry
Journal of Archaeological Science: Reports, 2018Co-Authors: Shinichi Takahashi, Takayuki Honda, Meesook Sung, Jaekook Jung, Tetsuo MiyakoshiAbstract:Abstract Sixteen lacquerwares excavated from the Minamikonuma ruins located in Saitama City, Saitama Prefecture, Japan, were analyzed by mean of cross-section observation, attenuated total reflection Fourier transform infrared spectroscopy (ATR-FT/IR), energy dispersive X-ray fluorescence (EDXRF), and pyrolysis gas chromatography/mass spectrometry (Py-GC/MS). The results showed that Fe2O3 was used as a red pigment in the relatively cheap lacquerwares or in the under layers, and HgS was used as another red pigment in an advanced stage. The characteristic urushiol products were detected in direct and derivative pyrolysis GC/MS of all sixteen lacquerwares and suggested that these Jōmon period lacquerwares were coated with lacquer sap collected from Toxicodendron Vernicifluum lacquer trees.
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identification of ryukyu lacquerwares by pyrolysis gas chromatography mass spectrometry and 87sr 86sr isotope ratio
Journal of Analytical and Applied Pyrolysis, 2016Co-Authors: Takayuki Honda, Yoshimi Kamiya, Shun'ichi Nakai, Tetsuo MiyakoshiAbstract:Abstract Six pieces of lacquer obtained from Ryukyu lacquerwares produced in the 17–19th century in the Ryukyu Kingdom were analyzed by pyrolysis gas chromatography/mass spectrometry and 87Sr/86Sr isotope ratio measurements to determine the identity of the lacquer source. The results were compared with the standard of natural lacquer film to discriminate lacquer species. Four pieces were made used lacquer sap collected from Toxicodendron Vernicifluum lacquer tree, and other two pieces were made with lacquer sap tapped from Toxicodendron succedanea lacquer tree according to the characteristics of the pyrolysis products. All 87Sr/86Sr isotope values of urushiol lacquerwares are over 0.71, suggesting that the origin of lacquer trees were the Asian continent.
Seung Wook Ham - One of the best experts on this subject based on the ideXlab platform.
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HPLC and ToF‒SIMS Analyses of Toxicodendron Vernicifluum Tree Sap Mixed with Other Natural Lacquers.
Molecules (Basel Switzerland), 2021Co-Authors: Seung Wook Ham, Yeonhee LeeAbstract:Lacquer sap has been used by humans from antiquitywhen it was treated as a luxury item because of its desirable physical properties. In modern times, although access barriers are lower, lacquer is still considered to be rare and valuable. Thus, low quality, inexpensive Vietnamese and Myanmarese lacquers and cashew nutshell liquid are frequently added to the costly Toxicodendron Vernicifluum lacquer sap from Korea, China, and Japan. However, these blended lacquers can diminish the quality of artisan works. The Toxicodendron Vernicifluum lacquer saps mixed with other natural lacquers were characterized using time-of-flight secondary-ion mass spectrometry (ToF-SIMS) and high-performance liquid chromatography (HPLC). ToF-SIMS provided the chemical structure of the lacquer monomer, copolymerized dimers, trimers, etc. HPLC provided quantitative analysis of the components of a randomly mixed lacquer. These techniques can be used to control the quality of commercial lacquer sap for the Asian lacquer industry and the traditional conservation of ancient objects.
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hplc and tof sims analyses of Toxicodendron Vernicifluum tree sap mixed with other natural lacquers
Molecules, 2021Co-Authors: Seung Wook Ham, Yeonhee LeeAbstract:Lacquer sap has been used by humans from antiquitywhen it was treated as a luxury item because of its desirable physical properties. In modern times, although access barriers are lower, lacquer is still considered to be rare and valuable. Thus, low quality, inexpensive Vietnamese and Myanmarese lacquers and cashew nutshell liquid are frequently added to the costly Toxicodendron Vernicifluum lacquer sap from Korea, China, and Japan. However, these blended lacquers can diminish the quality of artisan works. The Toxicodendron Vernicifluum lacquer saps mixed with other natural lacquers were characterized using time-of-flight secondary-ion mass spectrometry (ToF-SIMS) and high-performance liquid chromatography (HPLC). ToF-SIMS provided the chemical structure of the lacquer monomer, copolymerized dimers, trimers, etc. HPLC provided quantitative analysis of the components of a randomly mixed lacquer. These techniques can be used to control the quality of commercial lacquer sap for the Asian lacquer industry and the traditional conservation of ancient objects.
Takayuki Honda - One of the best experts on this subject based on the ideXlab platform.
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materials and provenance determination of lacquerware from the ryukyu kingdom period by pyrolysis gas chromatography mass spectrometry and 87sr 86sr isotope ratio
Journal of Archaeological Science: Reports, 2019Co-Authors: Rika Nakagawa, Shun'ichi Nakai, Tetsuo Miyakoshi, Takayuki HondaAbstract:Abstract Three wood chips found in a wooden coffin discovered in the Mumujyana graves of the Ryukyu Kingdom period were analyzed by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS), and the 87Sr/86Sr isotope ratio of one piece was measured by multi-collector inductively coupled plasma mass spectrometry to determine the materials used to produce the lacquerware and their provenance. Results from the derivative Py-GC/MS indicate that the lacquer was produced from sap of both Toxicodendron Vernicifluum, which grows in eastern Asia, and Toxicodendron succedaneum, which grows in southeastern Asia. The 87Sr/86Sr isotope ratios of the film layer and wooden base of one large chip, which is considered to be a stripped piece of the wooden coffin, were
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Materials and provenance determination of lacquerware from the Ryukyu Kingdom period by pyrolysis-gas chromatography/mass spectrometry and 87Sr/86Sr isotope ratio
Journal of Archaeological Science: Reports, 2019Co-Authors: Rika Nakagawa, Shun'ichi Nakai, Tetsuo Miyakoshi, Takayuki HondaAbstract:Abstract Three wood chips found in a wooden coffin discovered in the Mumujyana graves of the Ryukyu Kingdom period were analyzed by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS), and the 87Sr/86Sr isotope ratio of one piece was measured by multi-collector inductively coupled plasma mass spectrometry to determine the materials used to produce the lacquerware and their provenance. Results from the derivative Py-GC/MS indicate that the lacquer was produced from sap of both Toxicodendron Vernicifluum, which grows in eastern Asia, and Toxicodendron succedaneum, which grows in southeastern Asia. The 87Sr/86Sr isotope ratios of the film layer and wooden base of one large chip, which is considered to be a stripped piece of the wooden coffin, were
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Pyrolysis behavior of Asian lacquer film in the presence of carbon nanotubes with potential application as a new sampling method
Journal of Analytical and Applied Pyrolysis, 2019Co-Authors: Yoshitaka Nagai, Yoshimi Kamiya, Fumiya Sato, Shun Okamoto, Takayuki HondaAbstract:Abstract This study aims to report the possibility of applying a sampling method using a carbon nanotube–based sampling tool for pyrolysis–gas chromatography/mass spectrometry (Py–GC/MS) to qualitative analysis of Asian lacquer. This sampling tool comprises multiwalled carbon nanotubes (MWCNTs) and emulates the adhesive mechanism of geckos. To apply this sampling method to lacquer-containing archaeological samples, the films of Toxicodendron Vernicifluum, T. succedaneum and Gluta usitata, which are East Asian lacquers, were subjected to Py–GC/MS analysis. Similar to the conventional Py–GC/MS, the pyrolysis product characteristics of the three lacquer films were detected. However, compared with conventional Py–GC/MS, a difference was observed in the peak intensities of several pyrolyzates; this difference revealed the compositional change of pyrolyzates. To investigate the compositional change of pyrolyzates in detail, the T. Vernicifluum film was analyzed by Py–GC/MS in the presence of MWCNTs, and the pyrolysis mechanism of T. Vernicifluum film was discussed. The results suggest that MWCNTs promote side-chain cleavage and hydroxyl-group removal and alkylcatechols decompose into alkylbenzenes via alkylphenols.
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Analysis of Sakhalin-Ainu lacquerwares by pyrolysis gas chromatography/mass spectrometry
Journal of Archaeological Science: Reports, 2018Co-Authors: Soichiro Idei, Takayuki Honda, Tetsuo MiyakoshiAbstract:Abstract Six pieces of Sakhalin-Ainu lacquerware were analyzed by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) to determine the lacquer source. In the direct Py-GC/MS, 3-heptylphenol (P7) and 3-pentadecylphenol (P15) were detected in the mass chromatograms at m/z = 108, and palmitic acid and stearic acid were detected at m/z = 60 in the mass chromatograms of all pieces of Sakhalin-Ainu lacquerware, implying that drying oil was added to sap collected from a Toxicodendron Vernicifluum lacquer tree to prepare the lacquer. The energy dispersive X-ray fluorescence results showed that the component ratio of base ground powder was similar to that of Aizu and Joboji lacquerwares, and the Fourier transform infrared spectroscopy results showed that Sakhalin-Ainu lacquerwares used persimmon tannin in the base ground powder like Joboji lacquerwares, suggesting that Sakhalin-Ainu lacquerwares were produced in Joboji, Japan. Based on these results, the production district, history, and culture of the Sakhalin-Ainu lacquerwares are discussed.
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Analysis of Japanese Jōmon period red lacquerwares by pyrolysis gas chromatography/mass spectrometry
Journal of Archaeological Science: Reports, 2018Co-Authors: Shinichi Takahashi, Takayuki Honda, Meesook Sung, Jaekook Jung, Tetsuo MiyakoshiAbstract:Abstract Sixteen lacquerwares excavated from the Minamikonuma ruins located in Saitama City, Saitama Prefecture, Japan, were analyzed by mean of cross-section observation, attenuated total reflection Fourier transform infrared spectroscopy (ATR-FT/IR), energy dispersive X-ray fluorescence (EDXRF), and pyrolysis gas chromatography/mass spectrometry (Py-GC/MS). The results showed that Fe2O3 was used as a red pigment in the relatively cheap lacquerwares or in the under layers, and HgS was used as another red pigment in an advanced stage. The characteristic urushiol products were detected in direct and derivative pyrolysis GC/MS of all sixteen lacquerwares and suggested that these Jōmon period lacquerwares were coated with lacquer sap collected from Toxicodendron Vernicifluum lacquer trees.
Jian Yu Liu - One of the best experts on this subject based on the ideXlab platform.
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traditional uses phytochemistry and pharmacology of Toxicodendron Vernicifluum stokes f a barkley a review
Journal of Ethnopharmacology, 2020Co-Authors: Yunqiang Zhang, Chao Jie Xie, Jin Gou Gao, Cai We Meng, Jian Yu LiuAbstract:Abstract Ethnopharmacological relevance Toxicodendron Vernicifluum (Stokes) F.A. Barkley (syn. Rhus verniciflua or vernicifera Stokes, Anacardiaceae) (RVS), the lacquer tree, also known as sumac, has been used in China, Japan and South Korea for thousands of years as a highly durable coating material and a traditional herbal medicine, which contains medicinal ingredients with anti-tumor, anti-inflammatory, antiviral, and anti-rheumatic activities. Aim of this review This review intends to provide a comprehensive and critical appraisal of RVS, including its phytochemical data, botanical and pharmacological literature that support its therapeutic potential in treatment on human diseases, with emphasis on the isolation of natural occuring compounds and detailed pharmacological investigations. Materials and methods Specific information of RVS was collected by using the key words “Toxicodendron Vernicifluum”, “Rhus verniciflua Stokes”, “Rhus vernicifera Stokes” and “Lacquer tree” through published scientific materials (including PubMed, ScienceDirect, Wiley, ACS, CNKI, Scifinder, Springer, Web of Science, Google Scholar, and Baidu Scholar) and other literature sources. Results The major phytoconstituents, 175 of which are presented in this review, including flavonoids, urushiols, terpenes, phenolic acids and other types of compounds, of which flavonoids and urushiols are main components. The extracts and isolates purified from RVS showed a wide range of in vitro and in vivo pharmacological effects, such as anti-cancer, anti-oxidation, anti-inflammatory, antimicrobial, tyrosinase inhibition and so on. Conclusion The modern pharmacological research of RVS mainly focus on the pharmacological effects of crude extract or active constituents, of which the flavonoids are widely studied. However, there are few reports on the relationship between pharmacological effects and their structures. And at present, there is still a lack of researches that are of both effective and in-depth. Meanwhile, there is little research on quality control. Apart from the wood and lacquer, other botanical parts also need to be explored further. In addition to phenolic compounds, the study on other types of components in T. Vernicifluum would start more sparks for the discovery of new bioactive principles.
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chemical constituents from the heartwood of Toxicodendron Vernicifluum stokes f a barkley
Biochemical Systematics and Ecology, 2020Co-Authors: Chao Jie Xie, Jin Gou Gao, Cai We Meng, Jian Yu LiuAbstract:Abstract A phytochemical investigation of the heartwood of Toxicodendron Vernicifluum (Stokes) F.A. Barkley led to the isolation of twenty-five compounds, including sixteen flavonoids (1–15), one flavonolignan (16), one chromone (17), four benzoic acid derivatives (18–21), two triterpenes (22–23) and two sterols (24–25). The structures of these compounds were elucidated on the basis of spectroscopic analysis and comparison with previous literature data. Among them, 8 and 21were isolated from the genus Toxicodendron and 5, 9, 13, 17–20, 22 from the family Anacardiaceae for the first time. Furthermore, 21 had been identified only by LC/MS before. 20 was a synthetic product used as anthelmintics, newly identified as a natural product. Furthermore, the chemotaxonomic value of these isolates was also discussed in detail.
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the protective effects of vernicilignan a a new flavonolignan isolated from Toxicodendron Vernicifluum on sh sy5y cells against oxidative stress induced injury
Fitoterapia, 2019Co-Authors: Ting Zhong, Andong Wang, Jian Yu LiuAbstract:Abstract In this study, a new flavonolignan vernicilignan A was isolated from Toxicodendron Vernicifluum. The neuroprotective effects of this compound against H2O2 induced cell injury in SH-SY5Y cells were evaluated by MTT assay and LDH release assay. Vernicilignan A dose-dependently attenuated the cell injury and LDH release induced by H2O2 in SH-SY5Y cells. Further study indicated that vernicilignan A reduced cell apoptosis caused by H2O2 treatment via regulation of some apoptotic related proteins including Bax, Bcl-2, caspase 3 and caspase 9. Also, vernicilignan A increase the cell viability of H2O2 treated cells via the activation of Akt and GSK3β. Base on the findings, vernicilignan A exhibited neuroprotective effects through the activation of PI3K/Akt signaling and inhibition of mitochondria apoptosis pathway. Vernicilignan A might be a promising therapeutic agent for oxidative stress induced neurodegenerative diseases.