K
Katsuaki Hirano
Researcher at Saga University
Publications - 12
Citations - 184
Katsuaki Hirano is an academic researcher from Saga University. The author has contributed to research in topics: Fructooligosaccharide & Oligosaccharide. The author has an hindex of 6, co-authored 12 publications receiving 112 citations.
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Journal ArticleDOI
The ability of human intestinal anaerobes to metabolize different oligosaccharides: Novel means for microbiota modulation?
Riichi Ose,Katsuaki Hirano,Shintaro Maeno,Junichi Nakagawa,Seppo Salminen,Takumi Tochio,Akihito Endo +6 more
TL;DR: The metabolic properties of six oligosaccharides are demonstrated in 31 key gut anaerobes and fermentation profiles indicated specific links between the microbial end-products and specific gut microbes, assisting in predicting the impact of oligosACcharides in human intervention and gut microbiota modulation.
Journal ArticleDOI
In Vitro Evaluation of Different Prebiotics on the Modulation of Gut Microbiota Composition and Function in Morbid Obese and Normal-Weight Subjects.
Alicja Nogacka,Alicja Nogacka,Nuria Salazar,Nuria Salazar,Silvia Arboleya,Silvia Arboleya,Patricia Ruas-Madiedo,Patricia Ruas-Madiedo,Leonardo Mancabelli,Adolfo Suárez,Adolfo Suárez,Ceferino Martinez-Faedo,Ceferino Martinez-Faedo,Marco Ventura,Takumi Tochio,Katsuaki Hirano,Akihito Endo,Clara G. de los Reyes-Gavilán,Clara G. de los Reyes-Gavilán,Miguel Gueimonde,Miguel Gueimonde +20 more
TL;DR: Differences in the responses among the tested compounds but also among the studied human populations are obtained, indicating the need for developing population-specific products.
Journal ArticleDOI
Crystal structure of a β-fructofuranosidase with high transfructosylation activity from Aspergillus kawachii.
Mika Nagaya,Miyoko Kimura,Yoshifumi Gozu,Shona Sato,Katsuaki Hirano,Takumi Tochio,Atsushi Nishikawa,Takashi Tonozuka +7 more
TL;DR: It is found that Aspergillus kawachii IFO 4308 β-fructofuranosidase (AkFFase) produces fructooligosaccharides, mainly 1-kestose, from sucrose and the complex structure of AkFFase with fructose unexpectedly showed that fructose binds both subsites −1 and +1, despite the fact that the catalytic residues were not mutated.
Journal ArticleDOI
Classification of Chitosanases by Hydrolytic Specificity toward N¹,N⁴-Diacetylchitohexaose
Katsuaki Hirano,Masamichi Watanabe,Kiyohiko Seki,Akikazu Ando,Akihiro Saito,Masaru Mitsutomi +5 more
TL;DR: The results for the hydrolytic specificities of chitosanases belonging to subclasses I, II, and III toward chitohexaose and N¹,N⁴-diacetylchito hexaose agreed with previous results obtained by analysis of the Hydrolysis products of partially N-acetylated chitOSan.
Journal ArticleDOI
Characterization of a Chitosanase from Aspergillus fumigatus ATCC13073
TL;DR: Reaction rate analyses of mono-N-acetylated chitohexaose suggested that the (+3) site of chitosanase II recognizes the GlcNAc residue rather than theglcN residue of its substrate, suggesting that it is a subclass I chitOSanase.