H
Hiroshi Ashihara
Researcher at Ochanomizu University
Publications - 42
Citations - 5067
Hiroshi Ashihara is an academic researcher from Ochanomizu University. The author has contributed to research in topics: Caffeine synthase & Trigonelline. The author has an hindex of 32, co-authored 42 publications receiving 4506 citations. Previous affiliations of Hiroshi Ashihara include Kyoto Institute of Technology & Glasgow Royal Infirmary.
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Distribution and biosynthesis of theanine in Theaceae plants.
TL;DR: The theanine content of the leaves of 27 species or varieties of Theaceae plants was investigated, but in much lower amounts than the quantity detected in Camellia sinensis var.
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De novo and salvage biosynthetic pathways of pyridine nucleotides and nicotinic acid conjugates in cultured plant cells
TL;DR: From the in vitro determination of enzyme activity, it is concluded that quinolinic acid and nicotinic acid are converted to nucleotides by quinolinate phosphoribosyltransferase (2.4.2.19) and nicotinate phosphorbosyl transferase (4.1.11), respectively.
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Changes in trigonelline (N-methylnicotinic acid) content and nicotinic acid metabolism during germination of mungbean (Phaseolus aureus) seeds.
TL;DR: Nicotinic acid and trigonelline absorbed by the cotyledons were transported to the embryonic axes during germination, and the role of trig onelline synthesis in mungbean seedlings is discussed.
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Pyridine nucleotide cycle and trigonelline (N-methylnicotinic acid) synthesis in developing leaves and fruits of Coffea arabica
TL;DR: Although the biosynthetic activity of trigonelline from exogenously supplied [ 14 C]nicotinamide was observed in aged leaves, the endogenous supply of nicotinamide may be limited, reducing the contents in these leaves, suggesting that the pyridine nucleotide cycle operates in coffee plants, and trig onelline is synthesized from nicotinic acid formed in the cycle.
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Theophylline metabolism in higher plants.
TL;DR: The data indicate that the main route of theophylline degradation in higher plants involves a theophyLLine --> 3-methylxanthine --> xanthine ― uric acid ― allantoin --> allantoic acid --> CO2 + NH3 pathway.