著者

Britt S.R. Claes Emi Takeo Eiichiro Fukusaki Shuichi Shimma Ron M.A. Heeren

出版者

The Mass Spectrometry Society of Japan

雑誌

Mass Spectrometry (ISSN:2187137X)

巻号頁・発行日

pp.A0078, (Released:2019-11-06)

参考文献数

119

被引用文献数

4

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Mass spectrometry imaging is an imaging technology that allows the localization and identification of molecules on (biological) sample surfaces. Obtaining the localization of a compound in tissue is of great value in biological research. Yet, the identification of compounds remains a challenge. Mass spectrometry alone, even with high-mass resolution, cannot always distinguish between the subtle structural differences of isomeric compounds. This review discusses recent advances in mass spectrometry imaging of lipids, steroid hormones, amino acids and proteins that allow imaging with isomeric resolution. These improvements in detailed identification can give new insights into the local biological activity of isomers.

著者

Britt S. R. Claes Emi Takeo Eiichiro Fukusaki Shuichi Shimma Ron M. A. Heeren

出版者

The Mass Spectrometry Society of Japan

雑誌

Mass Spectrometry (ISSN:2187137X)

巻号頁・発行日

vol.8, no.1, pp.A0078, 2019-12-27 (Released:2019-12-28)

参考文献数

119

被引用文献数

4

---

Mass spectrometry imaging is an imaging technology that allows the localization and identification of molecules on (biological) sample surfaces. Obtaining the localization of a compound in tissue is of great value in biological research. Yet, the identification of compounds remains a challenge. Mass spectrometry alone, even with high-mass resolution, cannot always distinguish between the subtle structural differences of isomeric compounds. This review discusses recent advances in mass spectrometry imaging of lipids, steroid hormones, amino acids and proteins that allow imaging with isomeric resolution. These improvements in detailed identification can give new insights into the local biological activity of isomers.

著者

Seitaro OHTSU Masamitsu YAMAGUCHI Hisashi NISHIWAKI Eiichiro FUKUSAKI Shuichi SHIMMA

出版者

The Japan Society for Analytical Chemistry

雑誌

Analytical Sciences (ISSN:09106340)

巻号頁・発行日

vol.34, no.9, pp.991-996, 2018-09-10 (Released:2018-09-10)

参考文献数

19

被引用文献数

12

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Imidacloprid is widely used for exterminating harmful insects; however, information regarding its distribution in insects is limited. Herein, we developed a visualization method for imidacloprid in Drosophila melanogaster, by using matrix-assisted laser desorption/ionization imaging mass spectrometry (MALDI-IMS). IMS requires sample cryosections; however, certain challenges prevail in retaining fly morphology in sections owing to their small size and heterogeneous components. Therefore, the section preparation method was optimized first, followed by imidacloprid distribution visualized using MALDI-IMS. Using 10% gelatin as an embedding material and 70% ethanol for pretreatment, the gaps between embedding material and D. melanogaster body surface were reduced. The tight adhesion between embedding media and D. melanogaster retains fly morphology in sections. Furthermore, the imidacloprid standard was analyzed separately via MALDI and electrospray ionization (ESI), and imidacloprid was converted to guanidine-imidacloprid via laser irradiation. Consequently, the imidacloprid distribution in D. melanogaster was successfully visualized using guanidine-imidacloprid as the target peak.

著者

Seitaro OHTSU Masamitsu YAMAGUCHI Hisashi NISHIWAKI Eiichiro FUKUSAKI Shuichi SHIMMA

出版者

The Japan Society for Analytical Chemistry

雑誌

Analytical Sciences (ISSN:09106340)

巻号頁・発行日

pp.18SCP04, (Released:2018-06-29)

被引用文献数

12

著者

Soichiro Ikuta Eiichiro Fukusaki Shuichi Shimma

出版者

Pesticide Science Society of Japan

雑誌

Journal of Pesticide Science (ISSN:1348589X)

巻号頁・発行日

pp.D22-063, (Released:2023-03-23)

参考文献数

23

---

Fungicides must penetrate the internal tissues of plants to kill pathogenic fungi. Mass spectrometers have been used to confirm this penetration, but conventional mass spectrometric methods cannot distinguish the fungicides in different internal tissues owing to the extraction steps. However, matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) can detect the penetration of fungicides into leaf sections through direct analysis of the sample surfaces. Therefore, the objective of this study was to establish a method for visualizing fungicide penetration in wheat leaf cross sections using MALDI-MSI. The penetration of azoxystrobin from the epidermal to the internal tissue of the leaves was observed. Moreover, azoxystrobin accumulates in the cells around the vascular bundle. This study suggests that MSI can be useful for the evaluation of fungicide penetration in plant leaves.

著者

Soichiro Ikuta Eiichiro Fukusaki Shuichi Shimma

出版者

Pesticide Science Society of Japan

雑誌

Journal of Pesticide Science (ISSN:1348589X)

巻号頁・発行日

vol.48, no.2, pp.29-34, 2023-05-20 (Released:2023-06-14)

参考文献数

23

---

Fungicides must penetrate the internal tissues of plants to kill pathogenic fungi. Mass spectrometers have been used to confirm this penetration, but conventional mass spectrometric methods cannot distinguish the fungicides in different internal tissues owing to the extraction steps. However, matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) can detect the penetration of fungicides into leaf sections through direct analysis of the sample surfaces. Therefore, the objective of this study was to establish a method for visualizing fungicide penetration in wheat leaf cross sections using MALDI-MSI. The penetration of azoxystrobin from the epidermal to the internal tissue of the leaves was observed. Moreover, azoxystrobin accumulates in the cells around the vascular bundle. This study suggests that MSI can be useful for the evaluation of fungicide penetration in plant leaves.

著者

Adinda Putri Wisman Yoshihiro Tamada Shuji Hirohata Eiichiro Fukusaki Shuichi Shimma

出版者

The Mass Spectrometry Society of Japan

雑誌

Mass Spectrometry (ISSN:2187137X)

巻号頁・発行日

vol.9, no.1, pp.A0089, 2020-08-26 (Released:2020-08-26)

参考文献数

26

被引用文献数

5

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The compounds inside rice koji have been thoroughly investigated as an essential material in making many food-related products, including sake. However, these studies focused only on quantitative aspects, leaving features that can still be uncovered if seen from a new perspective. Visualization of the metabolites inside rice koji may as well be the new angle needed to retrieve more information regarding rice koji making. Here we utilized mass spectrometry imaging (MSI) to visualize the distribution of sugars, sugar alcohols, and amino acids inside rice koji. Imaging results revealed that several sugars alcohols and amino acids were shown to have characteristic distribution near the edges or surface of rice koji. Furthermore, the distribution appears to be correlated with the different structure of rice koji. This study is the first report of using MSI to visualize sugars, sugar alcohols, and amino acids in rice koji.

著者

Kazuo Omori Naoto Katakami Shoya Arakawa Yuichi Yamamoto Hiroyo Ninomiya Mitsuyoshi Takahara Taka-aki Matsuoka Hiroshi Tsugawa Masahiro Furuno Takeshi Bamba Eiichiro Fukusaki Iichiro Shimomura

出版者

Japan Atherosclerosis Society

雑誌

Journal of Atherosclerosis and Thrombosis (ISSN:13403478)

巻号頁・発行日

pp.52506, (Released:2020-01-25)

参考文献数

32

被引用文献数

15

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Aim: An identification of the high-risk group of atherosclerotic cardiovascular disease (CVD) is important in the management of patients with diabetes. Metabolomics is a potential tool for the discovery of new biomarkers. With this background, we aimed to identify metabolites associated with atherosclerosis in patients with type 2 diabetes mellitus (T2DM). Methods: A total of 176 patients with T2DM who have never had a CVD event and 40 who were survivors of coronary artery disease (CAD) events were enrolled. Non-targeted metabolome analysis of fasting plasma samples was performed using gas chromatography coupled with mass spectrometry (GC/MS) highly optimized for multiple measurement of blood samples. First, metabolites were screened by analyzing the association with the established markers of subclinical atherosclerosis (i.e., carotid maximal intima-media thickness (max-IMT) and flow-mediated vasodilation (FMD)) in the non-CVD subjects. Then, the associations between the metabolites detected and the history of CAD were investigated. Result: A total of 65 annotated metabolites were detected. Non-parametric univariate analysis identified inositol and indoxyl sulfate as significantly (p<0.05) associated with both max-IMT and FMD. These metabolites were also significantly associated with CAD. Moreover, inositol remained to be associated with CAD even after adjustments for traditional coronary risk factors. Conclusions: We identified novel biomarker candidates for atherosclerosis in Japanese patients with T2DM using GC/MS-based non-targeted metabolomics.