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4 results on '"Hiroki Horiba"'

1. Biological Activities and Phytochemical Profiles of Extracts from Different Parts of Bamboo (Phyllostachys pubescens)

Author

Akinobu Tanaka, Qinchang Zhu, Hui Tan, Hiroki Horiba, Koichiro Ohnuki, Yasuhiro Mori, Ryoko Yamauchi, Hiroya Ishikawa, Akira Iwamoto, Hiroharu Kawahara, and Kuniyoshi Shimizu

Subjects
Phyllostachys pubescens, cosmetics, anti-melanogenesis, antioxidation, antibacterial, anti-allergy, HPLC, LC-MS-IT-TOF, Organic chemistry, QD241-441
Abstract

Besides being a useful building material, bamboo also is a potential source of bioactive substances. Although some studies have been performed to examine its use in terms of the biological activity, only certain parts of bamboo, especially the leaves or shoots, have been studied. Comprehensive and comparative studies among different parts of bamboo would contribute to a better understanding and application of this knowledge. In this study, the biological activities of ethanol and water extracts from the leaves, branches, outer culm, inner culm, knots, rhizomes and roots of Phyllostachys pubescens, the major species of bamboo in Japan, were comparatively evaluated. The phytochemical profiles of these extracts were tentatively determined by liquid chromatography-mass spectrometry (LC-MS) analysis. The results showed that extracts from different parts of bamboo had different chemical compositions and different antioxidative, antibacterial and antiallergic activities, as well as on on melanin biosynthesis. Outer culm and inner culm were found to be the most important sources of active compounds. 8-C-Glucosylapigenin, luteolin derivatives and chlorogenic acid were the most probable compounds responsible for the anti-allergy activity of these bamboo extracts. Our study suggests the potential use of bamboo as a functional ingredient in cosmetics or other health-related products.

Published
2014
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2. Immunostimulatory effects of a subcritical water extract of Ganoderma

Author

Koji Hattori, Hiroshi Takagi, Yuichiro Ogata, Takaaki Yamada, Hiroki Horiba, Kousuke Fukata, Tsutomu Sakaida, Youichi Yashiro, Seiji Hasegawa, and Hiroyuki Tanaka

Subjects
General Neuroscience, General Medicine, General Pharmacology, Toxicology and Pharmaceutics, General Biochemistry, Genetics and Molecular Biology
Published
2022
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3. Biological Activities of Extracts from Different Parts of Cryptomeria japonica

Author

Hiroki, Horiba, Toshinori, Nakagawa, Qinchang, Zhu, Ahmed, Ashour, Atsushi, Watanabe, and Kuniyoshi, Shimizu

Subjects
Staphylococcus aureus, Plant Extracts, Cryptomeria, Phytochemicals, Melanoma, Experimental, Microbial Sensitivity Tests, Antioxidants, Gas Chromatography-Mass Spectrometry, Anti-Bacterial Agents, Mice, Japan, Phenols, Cell Line, Tumor, Animals
Abstract

Cryptomeria japonica is one of the most important forest tree species in Japan. To increase the demand for domestic timber, broad uses related to the functional attributes of C. japonica must be developed. Several studies have examined the usefulness of C. japonica in terms of its biological activities, but a comprehensive study subjecting all parts of the C. japonica plant to the same solvent for extraction has not been done. Here, methanol extractions from the leaves, branches, bearing branches, male flowers, female flowers, cones, bark, heartwood, sapwood, pith, rhizomes, roots, and pollen were subjected to several in vitro assays of their biological activities such as antioxidant activity, anti-lipase activity, antibacterial activity and melanin-biosynthesis-inhibition activity. Their total phenolic content was also determined. The methanol extracts from each part of C. japonica except for pollen showed strong activities in the bioactivity assays. Furthermore, the methanol extracts were analyzed by GC/MS. The phytochemical profile varied among extracts from various parts of C. japonica. Our results suggest the great potential of C. japonica for use as a functional ingredient in health-related products.

Published
2019

4. Biological Activities of Extracts from Different Parts of Cryptomeria japonica

Author

Hiroki Horiba, Qinchang Zhu, Atsushi Watanabe, Ahmed Ashour, Toshinori Nakagawa, and Kuniyoshi Shimizu

Subjects
0106 biological sciences, Cryptomeria, Plant Science, Biology, medicine.disease_cause, 01 natural sciences, Japonica, Ingredient, 010608 biotechnology, Pollen, Drug Discovery, Botany, medicine, Pharmacology, 010405 organic chemistry, fungi, food and beverages, General Medicine, biology.organism_classification, 0104 chemical sciences, Rhizome, Complementary and alternative medicine, Phytochemical, visual_art, visual_art.visual_art_medium, Bark, Pith
Abstract

Cryptomeria japonica is one of the most important forest tree species in Japan. To increase the demand for domestic timber, broad uses related to the functional attributes of C. japonica must be developed. Several studies have examined the usefulness of C. japonica in terms of its biological activities, but a comprehensive study subjecting all parts of the C. japonica plant to the same solvent for extraction has not been done. Here, methanol extractions from the leaves, branches, bearing branches, male flowers, female flowers, cones, bark, heartwood, sapwood, pith, rhizomes, roots, and pollen were subjected to several in vitro assays of their biological activities such as antioxidant activity, anti-lipase activity, antibacterial activity and melanin-biosynthesis-inhibition activity. Their total phenolic content was also determined. The methanol extracts from each part of C. japonica except for pollen showed strong activities in the bioactivity assays. Furthermore, the methanol extracts were analyzed by GC/MS. The phytochemical profile varied among extracts from various parts of C. japonica. Our results suggest the great potential of C. japonica for use as a functional ingredient in health-related products.

Published
2016
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