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Featured researches published by Yoshitomi Iizuka.


Archive | 1990

Properties of Selenium-Induced Glutathione Peroxidase in Low-CO2-Grown Chlamydomonas reinhardtii

Shigeru Shigeoka; Toru Takeda; Tsuyoshi Hanaoka; Akiho Yokota; Shozaburo Kitaoka; Yoshitomi Iizuka

Organisms have catalase, l-ascorbate peroxidase (AsAPOD), and glutathione peroxidase (GSHPOD) capable of scavenging H2O2, one of the toxic forms of O2. Catalase with a low affinity for H2O2 is found only in peroxisomes and cannot decompose the lipid hydroperoxides. Thus, AsA- and GSHPODs detoxify such active oxygens in energy-generating organelles. While both peroxidases have the same function in protection of the cell from oxidative damage, the distribution of the peroxidases is apparently distinct: AsAPOD occurs only in plant tissues, protozooa, and algae, while GSHPOD is only present in animal tissues (1).


Nippon Eiyo Shokuryo Gakkaishi | 1986

Effect of Euglena wax esters on growth and some organs in rats.

Shigeru Shigeoka; Toshio Ohnishi; Tetsuo Murakami; Yoshitomi Iizuka; Yoshihisa Nakano; Shozaburo Kitaoka

ワックス・エステルのラット生育や各臓器に及ぼす影響を検討するために, ワックス・エステルを多量に含むEnglenaの給餌と, ワックス・エステルの強制経口投与を行なった。給餌実験では, Eecglena食群はカゼ身ソ食群と同様の生育を示し, 両群で有意な差は認められなかった。また両群の相対臓器重量も, ほとんど変化がなかった。糞量は, Euglena食群で有意な増加が認められたが, これはEuglenara含まれる非消化性の貯臓多糖であるパラミロソ (β-1, 3-グルカン) によるものであった。Euglena食群の尿量は, カゼイン食群に比べて有意に滅少していた。糞中へのワックス・エステル排泄量は, 投与量のわずか1.5%であり, 各臓器・組織中にも著しい蓄積は認められなかった。 精製ワックス・エステルを強制的に経口投与しても, 生育と食餌摂取量は, 無投与群とまったく変わらなかった。また, 糞・尿排泄量や相対臓器重量にもまったく影響を及ぼさなかった。糞中のワックス・エステル量は, 投与量の2.8%にすぎず, 各臓器や血液にも, ほとんど検出されなかった。 以上より, 投与したEuglenaワックス・エステルは, ラット生育に影響を及ぼすことなく, 活発に代謝・吸収されていることがわかった。


Agricultural and biological chemistry | 2014

Structure and hypotensive effect of flavonoid glycosides in Citrus unshiu peelings

Yoshiharu Matsubara; Hiroyasu Kumamoto; Yoshitomi Iizuka; Tetsuo Murakami; Kozo Okamoto; Hideo Miyake; Katsumi Yokoi


Agricultural and biological chemistry | 1986

Structure and Hypotensive Effect of Flavonoid Glycosides in Orange (Citrus sinensis OSBECK) Peelings

Hiroyasu Kumamoto; Yoshiharu Matsubara; Yoshitomi Iizuka; Kozo Okamoto; Katsumi Yokoi


Agricultural and biological chemistry | 1981

Monoterpenoid and Sesquiterpenoid Constituents of the Essential Oil of Sugi (Cryptomeria Japonica D. DON.)

Borjinn Shieh; Yoshitomi Iizuka; Yoshiharu Matsubara


Agricultural and biological chemistry | 1990

Structures of New Limonoid Glycosides in Lemon (Citrus limon BURM.f.) Peelings

Yoshiharu Matsubara; Akiyoshi Sawabe; Yoshitomi Iizuka


Agricultural and biological chemistry | 1991

Structures of New Cyclic Peptides in Young Unshiu (Citrus unshiu MARCOV.), Orange (Citrus sinensis OSBECK.) and Amanatsu (Citrus natsudaidai) Peelings

Yoshiharu Matsubara; Takehiko Yusa; Akiyoshi Sawabe; Yoshitomi Iizuka; Shin-ichi Takekuma; Yasuji Yoshida


Agricultural and biological chemistry | 1985

Structure and Hypotensive Effect of Flavonoid Glycosides in Kinkan (Fortunella japonica) Peelings

Hiroyasu Kumamoto; Yoshiharu Matsubara; Yoshitomi Iizuka; Kozo Okamoto; Katsumi Yokoi


Agricultural and biological chemistry | 1991

Structure and Physiological Activity of Phenyl Propanoid Glycosides in Lemon (Citrus limon Burm. f.) Peel

Yoshiharu Matsubara; Takehiko Yusa; Akiyoshi Sawabe; Yoshitomi Iizuka; Kozo Okamoto


Bulletin of the Agricultural Chemical Society of Japan | 1985

Structure and hypotensive effect of flavonoid glycosides in lemon peelings. Part II.

Hiroyasu Kumamoto; Yoshiharu Matsubara; Yoshitomi Iizuka; Kozo Okamoto; Katsumi Yokoi

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