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Qiao Y, Ikeda Y, Ito M, Kimura T, Ikeuchi T, Takita T, Yasukawa K. Inhibition of α‐amylase and α‐glucosidase by
Morus australis
fruit extract and its components iminosugar, anthocyanin, and glucose. J Food Sci 2022; 87:1672-1683. [DOI: 10.1111/1750-3841.16098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 01/20/2022] [Accepted: 02/07/2022] [Indexed: 11/30/2022]
Affiliation(s)
- Ying Qiao
- Divison of Food Science and Biotechnology, Graduate School of Agriculture Kyoto University Sakyo‐ku Japan
| | - Yuki Ikeda
- Divison of Food Science and Biotechnology, Graduate School of Agriculture Kyoto University Sakyo‐ku Japan
| | - Masaaki Ito
- Department of Bioresources Engineering, National Institute of Technology Okinawa College Nago Japan
| | - Toshiyuki Kimura
- Research Center of Advanced Analysis National Agriculture and Food Research Organization (NARO) Tsukuba Japan
| | - Takeaki Ikeuchi
- Divison of Food Science and Biotechnology, Graduate School of Agriculture Kyoto University Sakyo‐ku Japan
| | - Teisuke Takita
- Divison of Food Science and Biotechnology, Graduate School of Agriculture Kyoto University Sakyo‐ku Japan
| | - Kiyoshi Yasukawa
- Divison of Food Science and Biotechnology, Graduate School of Agriculture Kyoto University Sakyo‐ku Japan
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Qiao Y, Nakayama J, Ikeuchi T, Ito M, Kimura T, Kojima K, Takita T, Yasukawa K. Kinetic analysis of inhibition of α-glucosidase by leaf powder from Morus australis and its component iminosugars. Biosci Biotechnol Biochem 2020; 84:2149-2156. [DOI: 10.1080/09168451.2020.1783991] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Abstract
Mulberry leaves contain iminosugars, such as 1-deoxynojirimycin (1-DNJ), fagomine, and 2-O-α-D-galactopyranosyl deoxynojirimycin (GAL-DNJ) that inhibit α-glucosidase. In this study, we quantified iminosugars in Morus australis leaves and made the kinetic analysis in the hydrolysis of maltose by α-glucosidase. By LC-MS/MS, the concentrations of 1-DNJ, fagomine, and GAL-DNJ in the powdered leaves were 4.0, 0.46, and 2.5 mg/g, respectively, and those in the roasted ones were 1.0, 0.24, and 0.73 mg/g, respectively, suggesting that the roasting process degraded iminosugars. Steady-state kinetic analysis revealed that the powdered and roasted leaves exhibited competitive inhibition. At pH 6.0 at 37ºC, the IC50 values of the extracts from the boiled powdered or roasted leaves were 0.36 and 1.1 mg/mL, respectively. At the same condition, the IC50 values of 1-DNJ, fagomine, and GAL-DNJ were 0.70 μg/mL, 0.18 mg/mL, and 2.9 mg/mL, respectively. These results suggested that in M. australis, 1-DNJ is a major inhibitor of α-glucosidase.
Abbreviations
1-DNJ: 1-deoxynojirimycin; GAL-DNJ: 2-O-α-D-galactopyranosyl-DNJ
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Affiliation(s)
- Ying Qiao
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Juri Nakayama
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Takeaki Ikeuchi
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Masaaki Ito
- Department of Bioresources Engineering, National Institute of Technology, Okinawa College, Nago, Japan
| | - Toshiyuki Kimura
- Food Research Institute (NFRI), National Agriculture and Food Research Organization (NARO), Ibaraki, Japan
| | - Kenji Kojima
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Teisuke Takita
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Kiyoshi Yasukawa
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
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