Publications by authors named "Kin-ichi Oyama"

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Detection and Behaviors of TEMPO Derivatives in Seven Mass Spectrometry Ionization Methods.
Kin-Ichi Oyama, Seanghai Hor, Masaki Tsukamoto, Hedong Zhang

J Mass Spectrom· April 2025

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Reaction mechanism with indano[60]fullerene bromide for evaporable fullerene derivatives.
Hirofumi Amada, Yong-Chang Zhai, Koki Yamanaka, Qing-Jun Shui, Kin-Ichi Oyama

Chem Commun (Camb)· January 2025

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Insight into chemical mechanisms of sepal color development and variation in hydrangea.
Kumi Yoshida, Kin-Ichi Oyama, Tadao Kondo

Proc Jpn Acad Ser B Phys Biol Sci· July 2024

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Characteristics of LED light-induced geometrical isomerization and degradation of astaxanthin and improvement of the color value and crystallinity of astaxanthin utilizing the photoisomerization.
Yelin Zhang, Kentaro Takahama, Yukiko Osawa, Daichi Kuwahara, Rio Yamada, Kin-Ichi Oyama

Food Res Int· December 2023

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Blue flower coloration of Salvia macrophylla by the metalloanthocyanin, protodelphin.
Kumi Yoshida, Yada Teppabut, Chieko Sugita, Kin-Ichi Oyama

Biosci Biotechnol Biochem· September 2022

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Intermolecular Copigmentation Between Delphinidin 3--Glucoside and Chlorogenic Acid: Taking into Account the Existence of Neutral and Negatively Charged Forms of the Copigment.
André Seco, Nuno Basílio, Natércia F Brás, Kumi Yoshida, Tadao Kondo, Kin-Ichi Oyama

J Agric Food Chem· September 2022

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Blue flower coloration of Corydalis ambigua requires ferric ion and kaempferol glycoside.
Kumi Yoshida, Takeya Oniduka, Kin-Ichi Oyama, Tadao Kondo

Biosci Biotechnol Biochem· January 2021

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5,7,3',4'-Tetrahydroxyflav-2-en-3-ol 3-O-glucoside, a new biosynthetic precursor of cyanidin 3-O-glucoside in the seed coat of black soybean, Glycine max.
Kumi Yoshida, Yada Teppabut, Reo Sawaguchi, Yuhsuke Nakane, Emi Hayashi, Kin-Ichi Oyama

Sci Rep· October 2020

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Determination of absolute configuration of photo-degraded catechinopyranocyanidin A by modified Mosher's method.
Kin-Ichi Oyama, Tadao Kondo, Toshimichi Shimizu, Kumi Yoshida

Chirality· May 2020

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Author Correction: Structure of two purple pigments, catechinopyranocyanidins A and B from the seed-coat of the small red bean, Vigna angularis.
Kumi Yoshida, Nobukazu Nagai, Yoshiki Ichikawa, Miki Goto, Kohei Kazuma, Kin-Ichi Oyama

Sci Rep· November 2019

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Conversion of flavonol glycoside to anthocyanin: an interpretation of the oxidation-reduction relationship of biosynthetic flavonoid-intermediates.
Kin-Ichi Oyama, Yuki Kimura, Satoru Iuchi, Nobuaki Koga, Kumi Yoshida

RSC Adv· October 2019

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Structure of two purple pigments, catechiopyranocyanidins A and B from the seed-coat of the small red bean, Vigna angularis.
Kumi Yoshida, Nobukazu Nagai, Yoshiki Ichikawa, Miki Goto, Kohei Kazuma, Kin-Ichi Oyama

Sci Rep· February 2019

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Change of Petals' Color and Chemical Components in Flowers during Senescence.
Yada Teppabut, Kin-Ichi Oyama, Tadao Kondo, Kumi Yoshida

Molecules· July 2018

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Direct Observation of Hydrangea Blue-Complex Composed of 3--Glucosyldelphinidin, Al and 5--Acylquinic Acid by ESI-Mass Spectrometry.
Takaaki Ito, Kin-Ichi Oyama, Kumi Yoshida

Molecules· June 2018

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Synthesis of 8-Aryl-O-methylcyanidins and Their Usage for Dye-Sensitized Solar Cell Devices.
Yuki Kimura, Kin-Ichi Oyama, Yasujiro Murata, Atsushi Wakamiya, Kumi Yoshida

Int J Mol Sci· February 2017

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Efficient Preparation of Various O-Methylquercetins by Selective Demethylation.
Yuki Kimura, Ryo Kato, Kin-Ichi Oyama, Tadao Kondo, Kumi Yoshida

Nat Prod Commun· July 2016

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Metal Complex Pigment Involved in the Blue Sepal Color Development of Hydrangea.
Kin-ichi Oyama, Tomomi Yamada, Daisuke Ito, Tadao Kondo, Kumi Yoshida

J Agric Food Chem· September 2015

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Identification and characterization of flavonoids as sialyltransferase inhibitors.
Kazuya I P J Hidari, Kin-ichi Oyama, Go Ito, Miho Nakayama, Makoto Inai

Biochem Biophys Res Commun· May 2009

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Novel and efficient synthesis of cyanidin 3-O-beta-D-glucoside from (+)-catechin via a flav-3-en-3-ol as a key intermediate.
Tadao Kondo, Kin-Ichi Oyama, Saki Nakamura, Daisuke Yamakawa, Kazunari Tokuno

Org Lett· August 2006

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Total synthesis of flavocommelin, a component of the blue supramolecular pigment from Commelina communis, on the basis of direct 6-C-glycosylation of flavan.
Kin-Ichi Oyama, Tadao Kondo

J Org Chem· August 2004

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A novel and convenient chemoselective deprotection method for both silyl and acetyl groups on acidic hydroxyl groups such as phenol and carboxylic acid by using a nitrogen organic base, 1,1,3,3-tetramethylguanidine.
Kin-ichi Oyama, Tadao Kondo

Org Lett· January 2003

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Chiral Molecular Recognition on Formation of a Metalloanthocyanin: A Supramolecular Metal Complex Pigment from Blue Flowers of Salvia patens.
Tadao Kondo, Kin-Ichi Oyama, Kumi Yoshida

Angew Chem Int Ed Engl· March 2001

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