Entity

Time filter

Source Type

Kashiwa, Japan

Okumura R.,Kirin Company Ltd | Kumata N.,Kirin Company Ltd | Tsugoshi T.,Japan National Institute of Advanced Industrial Science and Technology | Mishima Y.,Tsurui Chemical Co. | Koizumi H.,Kirin Company Ltd
Bunseki Kagaku | Year: 2014

In this study, we examined a method to discriminate Coffea Arabica (Arabica) and Coffea canephora (Robusta). In order to explore the respective biomarkers, an ion attachment ionization mass spectrometer (IA-MS) equipped with a direct inlet probe (DIP) was used. It was possible to measure solid samples directly by DIP. Furthermore, in IA ionization mass spectra, because only quasi-molecular ion peaks are obtained, the mass spectra showed the characteristic pattern, which reflected the states in the sample. Therefore, easy screening analysis was possible. By using DIP/IA-MS, we measured nine kinds of roasted coffee beans. As a result, peaks estimated to be Kahweol palmitate and 16-O-methylcafestol palmitate were detected from Arabica and Robusta, respectively. In addition, this method offers an estimation of the mixed ratio of the Arabica and Robusta in not only roasted coffee beans milled, but extract with and without heat sterilization. © 2014 The Japan Society for Analytical Chemistry. Source


Mishima Y.,Tsurui Chemical Co. | Maruyama H.,Canon ANELVA Corporation | Hino K.,Canon ANELVA Corporation | Tsugoshi T.,Japan National Institute of Advanced Industrial Science and Technology | And 3 more authors.
Bunseki Kagaku | Year: 2011

In this study, a data-analysis technique for vegetable oil discrimination was discussed and offered using Ion Attachment Ionization (IA) Mass Spectrometry, which has a completely soft ionization technique with no fragmentation during ionization. In IA ionization mass spectra, only quasi-molecular ion peaks are obtained, so that the mass spectra showed the characteristic pattern, which reflected the states in the sample, even if there was no pre-separation technique, such as gas-chromatography. Referring to the database of soft-ionization mass spectra for nine kinds of vegetable oils, which was processed beforehand, oil discrimination and estimated values of mixed ratio were possible to be carried out with principal-component and cluster analyses, and a different calculation method of regression analysis, respectively. These methods should be useful for selective marking to the trace impurity in oils, e.g., 0.4 wt% signal of coconut oil in olive oil was detected. © 2011 The Japan Society for Analytical Chemistry. Source


Mishima Y.,Tsurui Chemical Co. | Yoshida H.,Tsurui Chemical Co. | Hino K.,Canon ANELVA Corporation | Onuki S.,Kanagawa University | And 3 more authors.
Bunseki Kagaku | Year: 2011

Evolved gas analyses by pyrolysis were carried out for 10 kinds of polymers using a newly developed prototype of Skimmer interface-connected [TG/DTA]/[Ion Attachment Ionization-TOFMS]. This prototype has an advantage of the real-time monitoring of pyrolyzed species because of no transformation of the evolved species with the skimmer interface and no fragmentation during ionization by the Ion Attachment Ionization technique. On the other hand, the combination of TG/DTA results and mass spectra offers the discrimination of polymers with the same chemical structure and different thermal properties. Examples were presented in this study. © 2011 The Japan Society for Analytical Chemistry. Source

Discover hidden collaborations