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138 results on '"Kozaki, Daisuke"'

9. Simultaneous capillary electrophoresis of anions and cations in a single injection using an anion exchanger-modified capillary for determination of salivary ions in combination with statistical analyses

Author

Mori, Masanobu, Aoyagi, Keisuke, Tomoda, Toshihiro, Ishikawara, Fumi, Sakamoto, Shou, Myochin, Hironori, Kuga, Midori, Kozaki, Daisuke, Ohshima, Noriyasu, Izumi, Takashi, Itabashi, Hideyuki, Shoho, Yoshifumi, Yoshida, Akihiro, Tsunekawa, Katsuhiko, Kimura, Takao, and Murakami, Masami

Published
2021
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18. Multi-Functional Separation Mode-Ion Chromatography Using L-Pyroglutamic Acid Eluent for Simultaneous Determination of Sugars, Organic Acids, and Ethanol during Multiple Parallel Fermentation of Rice Wine.

Author

Takeoka, Marino, Hoki, Yoshiro, Yoshinaka, Taichi, Hirano, Kentarou, Mitsui, Yuta, Doi, Tomotaka, Takemura, Akihiko, Asano, Tohru, Katoh, Reina, Nose, Akira, and Kozaki, Daisuke

Subjects
RICE wines, ORGANIC acids, FERMENTATION, ETHANOL, CHROMATOGRAPHIC analysis, TRICARBOXYLIC acids
Abstract

An effective evaluation method for understanding fermentation is required to support the implementation of newly developed yeast strains in brewing. Our group developed a multi-functional separation mode-ion chromatography (MFS-IC) with conductivity and refractive index detectors to separate key species (glucose, ethanol, and organic acids: pyruvate, citrate, L-malate, and succinate) with ethyl α-D-glucoside and glycerol to understand the fermentation behavior in brewing. Optimal chromatographic resolutions for determining eight different key species in rice wine by the MFS-IC were obtained in 45 min on low-molecular size-exclusion chromatographic separation columns modified with a strong cation-exchanger as the stationary phase with an eluent of L-pyroglutamic acid. Understanding the behavior of analytes in rice wine samples during rice wine fermentation enables the monitoring of the progress of saccharification, glycolysis, ethanol fermentation, and the tricarboxylic acid (TCA) cycle. These results are expected to contribute to understanding fermentation characteristics and implementing newly developed yeast strains in the fermentation field. [ABSTRACT FROM AUTHOR]

Published
2023
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20. Influence of Cr2O3 Concentration on the Green Color of Flux Synthesized Emeralds Using the CIE1976 Color System.

Author

Kozaki, Daisuke, Yanagisawa, Kazumichi, Oishi, Shuji, Nishiwaki, Yoshinori, Komatsu, Hibiki, Kobiro, Kazuya, Ito, Akitaka, Taniguchi, Ayano, and Matsuzaki, Takuya

Subjects
*ELECTRON probe microanalysis, *EMERALDS, *CHROMIUM oxide, *SINGLE crystals
Abstract

The color of emeralds is predominantly influenced by the concentration of Cr3+. However, the evaluation of the trend of green color depth of emeralds, based on the practical single crystal synthesis with several instrumental analysis is not investigated in previous researches. Specifically, if the Cr2O3 content is controlled to be in the range of 0.2–0.4 wt%, then emeralds can be synthesized with the most esthetically pleasing color. Therefore, the effect of Cr2O3 concentration within the aforementioned range on the color of emeralds is studied using powder X‐ray diffractometry, digital microscopy, electron probe microanalysis, and micro‐spectrophotometry to understand how to achieve the most esthetically pleasing color. As a result, detailed behaviors relating to the absorbances, L*, a*, and b* values, and the relationship between the emerald crystal color changes and increases in Cr2O3 concentration are elucidated. Notably, the absorbance, L* and a* values change significantly when the Cr2O3 concentration is low (0.00–0.236 wt%). However, the changes in these values are moderate when the Cr2O3 concentration is higher (0.236–0.504 wt%). [ABSTRACT FROM AUTHOR]

Published
2023
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23. Simple and Quick Analysis for Mercury in Environmental Water Using Alkaline Reduction along with Enclosed Quartz Cell-cold Vapor Atomic Absorption Spectrometry

Author

Tsuboi, Haruki, Uga, Yuki, Okunishi, Rushia, Watanabe, Tomoaki, Sakamoto, Koutarou, and Kozaki, Daisuke

Abstract

A simple and quick analytical method for mercury in environmental water was developed by combining enclosed quartz cell cold vapor atomic absorption spectrometry (EQC-CV-AAS) and alkaline reduction pretreatment. The advantages of this method include reduction in the mercury measurement time from 3 h to 5 min and the possibility of on-site mercury monitoring for environmental water matrix such as river and sea water.A quick analytical method for mercury was developed by combining the enclosed quartz cell cold vapor atomic absorption spectrometry and alkaline reduction pretreatment. The advantages of this method reduction in the measurement time from 3 h to 5 min and lower LOQ value than that proposed by the Water Pollution Prevention Act by the Ministry of the Environment, Japan.

Published
2023
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33. Development of a Size-Exclusion/Ion-Exclusion/Reversed-Phase Separation Method for the Simultaneous Determination of Inorganic and Organic Acids, Sugars, and Ethanol During Multiple Parallel Fermentation of Rice Wine

Author

Kozaki, Daisuke, primary, Yamamoto, Atsushi, additional, Tanihata, Souma, additional, Yamato, Naoki, additional, Mori, Masanobu, additional, Nose, Akira, additional, Asano, Tohru, additional, Yoshinaka, Taichi, additional, and Hirano, Kentarou, additional

Published
2020
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49. Simultaneous Measurement of Monovalent Cation Concentrations and Hydrogen Ion Concentration or Alkalinity in Environmental Waters by Ion Chromatography with Conductimetric Detection Using an ODS-Silica Column Modified with Lithium Dodecylsulfate

Author

Kozaki, Daisuke, primary, Goto, Ryozo, additional, Nakatani, Nobutake, additional, Nakagoshi, Nobukazu, additional, Hu, Wenzhi, additional, Mori, Masanobu, additional, and Tanaka, Kazuhiko, additional

Published
2009
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