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Furuki T, Nobeyama T, Suetaka S, Matsui R, Fukuoka T, Arai M, Shiraki K. Reentrant condensation of a multicomponent cola/milk system induced by polyphosphate. Food Chem X 2024; 21:101165. [PMID: 38328695 PMCID: PMC10847600 DOI: 10.1016/j.fochx.2024.101165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Revised: 01/18/2024] [Accepted: 01/26/2024] [Indexed: 02/09/2024] Open
Abstract
Reentrant condensation (RC) is a protein behavior in which the protein solution shifts between the one- and two-phase state more than twice by increasing a single parameter. Although RC would be a candidate mechanism for the physicochemical design of food additives, no realistic model has been established under diverse contaminants like food materials. Here, we found that a mixture of cola and milk yielded RC. At pH 3.2-3.6, cola induced milk condensation at 30-40%, while lower or higher concentrations of cola did not. Furthermore, we reduced this cola/milk system to two pure components, casein in milk and polyphosphate (polyP) in cola, and investigated the characteristics of casein concentration and zeta potential. This was the first experimental demonstration of RC occurrence in a multicomponent system. The well-characterized cola/milk system would explore both the universal nature of proteins and the industrial application of RC.
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Affiliation(s)
- Tomohiro Furuki
- Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
- Department of Integrated Sciences, College of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan
- Ishikawa Prefectural Nanao High School, E-1-1 Nishi-fujihashi, Nanao, Ishikawa 926-0817, Japan
| | - Tomohiro Nobeyama
- Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
| | - Shunji Suetaka
- Department of Integrated Sciences, College of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan
| | - Ryokei Matsui
- Ishikawa Prefectural Nanao High School, E-1-1 Nishi-fujihashi, Nanao, Ishikawa 926-0817, Japan
| | - Tatsuhiko Fukuoka
- Ishikawa Prefectural Nanao High School, E-1-1 Nishi-fujihashi, Nanao, Ishikawa 926-0817, Japan
| | - Munehito Arai
- Department of Integrated Sciences, College of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan
- Department of Physics, Graduate School of Science, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan
| | - Kentaro Shiraki
- Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
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Nobeyama T, Furuki T, Shiraki K. Phase-Diagram Observation of Liquid-Liquid Phase Separation in the Poly(l-lysine)/ATP System and a Proposal for Diagram-Based Application Strategy. Langmuir 2023; 39:17043-17049. [PMID: 37967197 DOI: 10.1021/acs.langmuir.3c01640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2023]
Abstract
Liquid-liquid phase separation (LLPS) is essential to understanding the biomacromolecule compartmentalization in living cells and to developing soft-matter structures for chemical reactions and drug delivery systems. However, the importance of detailed experimental phase diagrams of modern LLPS systems tends to be overlooked in recent times. Even for the poly(l-lysine) (PLL)/ATP system, which is one of the most widely used LLPS models, any detailed phase diagram of LLPS has not been reported. Herein, we report the first phase diagram of the PLL/ATP system and demonstrate the feasibility of phase-diagram-based research design for understanding the physical properties of LLPS systems and realizing biophysical and medical applications. We established an experimentally handy model for the droplet formation-disappearance process by generating a concentration gradient in a chamber for extracting a suitable condition on the phase diagram, including the two-phase droplet region. As a proof of concept of pharmaceutical application, we added a human immunoglobulin G (IgG) solution to the PLL/ATP system. Using the knowledge from the phase diagram, we realized the formation of IgG/PLL droplets in a pharmaceutically required IgG concentration of ca. 10 mg/mL. Thus, this study provides guidance for using the phase diagram to analyze and utilize LLPS.
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Affiliation(s)
- Tomohiro Nobeyama
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8573, Japan
| | - Tomohiro Furuki
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8573, Japan
| | - Kentaro Shiraki
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8573, Japan
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Furuki T. Effect of stereochemistry on the anti-freeze characteristics of carbohydrates. A thermal study of aqueous monosaccharides at subzero temperatures. Carbohydr Res 2000; 323:185-91. [PMID: 10782300 DOI: 10.1016/s0008-6215(99)00251-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Thermal behavior at subzero temperatures has been investigated for aqueous solutions of various monosaccharides. The heat of fusion of ice measured with differential scanning calorimetry has given linear plots against sugar concentration (wt.%), from which the amount of unfrozen water, Uw, has been determined for each monosaccharide. The results for Uw are analyzed by employing, as a measure of hydration characteristics, known physico-chemical properties of aqueous monosaccharides, such as partial molar compressibilities, etc. It was revealed that the anti-freeze characteristics of carbohydrates depend on their stereochemistry. More water remains unfrozen in the aqueous solutions of carbohydrates having poorer compatibility with the three-dimensional hydrogen-bond network of water. Monosaccharides studied can be subdivided into three groups according to the extent of the anti-freeze effect. These results are rationalized in terms of a modified stereospecific hydration model.
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Affiliation(s)
- T Furuki
- Fundamental Technology Division, Kanagawa Industrial Technology Research Institute, Japan.
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Abstract
We evaluated the association between coronary spasm and hyperinsulinemia (high immunoreactive insulin, IRI) in patients with angina pectoris. The study cohort comprised 30 patients with spastic angina pectoris, 30 patients with angina pectoris showing fixed-obstructive coronary sclerosis and 30 control subjects who were matched for body mass index, age and sex. A 75-gram oral glucose test was performed, and blood sugar and IRI were serially measured concomitant with serum total cholesterol, triglyceride and HDL cholesterol. The IRI level at 60 min, the peak IRI during the test, sigma IRI and sigma IRI/sigma blood sugar were significantly higher in the patients than in the controls. Total cholesterol and LDL cholesterol levels were significantly increased in patients showing fixed-obstructive coronary sclerosis compared to controls.
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Affiliation(s)
- R Miyawaki
- Department of Internal Medicine, Fukuoka University Chikushi Hospital, Japan
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Furuki T, Sakurai M, Inoue Y. [The catalytic mechanism of carbonic anhydrase]. Tanpakushitsu Kakusan Koso 1995; 40:1835-45. [PMID: 7480792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- T Furuki
- Department of Biomolecular Engineering, Faculty of Bioscience and Biotechnology, Yokohama, Japan
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Sha K, Furuya H, Yan S, Kuzumoto N, Furuki T, Okuda T. [Effects of nitroglycerin, prostaglandin E1, trimetaphan and nicardipine on systemic vascular resistance, pulmonary vascular resistance and pulmonary-systemic vascular resistance ratio in dogs]. Masui 1995; 44:944-9. [PMID: 7637184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Effects of the experimentally induced hypotension with 4 vasodilators; nitroglycerin (TNG), prostaglandin E1 (PGE1), trimetaphan (TMP) and nicardipine (NCP) on systemic vascular resistance (SVR), pulmonary vascular resistance (PVR) and pulmonary-systemic vascular resistance ratio (PVR/SVR ratio) were studied in dogs. The SVR values were significantly reduced by TNG, PGE1 and NCP, and not affected by TMP. The PVR values were significantly reduced by TNG and PGE1, and not affected by TMP and NCP. The PVR/SVR ratio values were significantly reduced by TNG, and significantly increased by NCP, and not affected by PGE1 and TMP. We concluded that TNG reduced PVR and SVR but it affected PVR more; PGE1 reduced PVR and SVR equivalently; TMP did not affect PVR and SVR remarkably; NCP reduced SVR but did not affect PVR.
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Affiliation(s)
- K Sha
- Department of Anesthesiology, Nara Medical University, Kashihara
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Nosaki T, Murai T, Okumura A, Furuki T, Mori K, Tsuji S, Nakanishi K, Kobayashi M, Fukui A, Fujii K. [CT findings of bone metastasis]. Rinsho Hoshasen 1989; 34:991-7. [PMID: 2810844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Computed tomograms of 150 cases with bone metastasis of various malignant neoplastic diseases are reviewed. According to CT findings bone metastasis is classified into six types, namely osteoblastic, mixed, osteolytic with sclerotic rim, osteolytic with sclerotic center, osteolytic, and infiltrative. Presumably many bone metastases show initially osteoblastic type on CT, and change progressively to mixed type or osteolytic type. If chemotherapy or radiotherapy is effective for bone metastasis, CT demonstrates changes of inverse direction. In detection of bone metastasis CT is superior to radionuclide bone scan. To find out the bone metastasis CT of cancer patients must be evaluated with bone window.
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Takamori S, Motonaga T, Inui M, Miyazaki T, Furuki T, Iwai M, Okuno T, Takino T. [Study on the nicotinic acid loading test in patients with various liver diseases]. Nihon Shokakibyo Gakkai Zasshi 1984; 81:238-48. [PMID: 6716707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Fukushima Y, Kawachi T, Makanishi M, Furuki T, Sugimura T. Histamine formation in spontaneous gastric carcinoids of Praomys (Mastomys) natalensis. Gan 1974; 65:279-80. [PMID: 4852273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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