1
|
Ding X, Sun S, Zhang J, Zhao H, Lun F, Liu X, Zhen Y, Dong J, Wu J. Ferric citrate for the treatment of hyperphosphatemia and iron deficiency anaemia in patients with NDD-CKD: a systematic review and meta-analysis. Front Pharmacol 2024; 15:1285012. [PMID: 38515853 PMCID: PMC10955115 DOI: 10.3389/fphar.2024.1285012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Accepted: 02/27/2024] [Indexed: 03/23/2024] Open
Abstract
Background: The application of ferric citrate therapy has yielded unexpected benefits in recent years for Chronic kidney disease patients suffering from hyperphosphatemia and iron deficiency -anaemia. Despite this, earlier research on the impact of ferric citrate on NDD-CKD has been contentious. Objective: The goal of the meta-analysis is to evaluate the evidence regarding the advantages and dangers of ferric citrate for the treatment of hyperphosphatemia and iron deficiency anaemia in NDD-CKD patients. Methods: Between the start of the study and June 2022, we searched PubMed, Embase, Cochrane, EBSCO, Scopus, Web of Science, Wan Fang Data, CNKI, and VIP databases for randomised controlled trials of iron citrate for hyperphosphatemia and anaemia in patients with NDD-CKD. For binary categorical data, risk ratios (OR) were employed, and for continuous variables, weighted mean differences The effect sizes for both count and measurement data were expressed using 95% confidence intervals Results: The meta-analysis includes eight trials with a total of 1281 NDD-CKD patients. The phosphorus-lowering effect of ferric citrate was greater compared to the control group (WMD, -0.55, 95% CI, -0.81 to -0.28; I2 = 86%, p < 0.001). Calcium (WMD, 0.092; 95% CI, -0.051 to 0.234; p > 0.05; I2 = 61.9%), PTH (WMD, -0.10; 95% CI, -0.44 to 0.23; I2 = 75%, p > 0.05) and iFGF23 (WMD, -7.62; 95% CI, -21.18 to 5.94; I2 = 20%, p > 0.05) levels were not statistically different after ferric citrate treatment compared to control treatment. Furthermore, ferric citrate increased iron reserves and haemoglobin. The ferric citrate group had considerably greater levels than the controls. Ferric citrate, on the other hand, may raise the risk of constipation, diarrhoea, and nausea. Conclusion: This meta-analysis found that ferric citrate had a beneficial effect in the treatment of NDD-CKD, particularly in reducing blood phosphorus levels when compared to a control intervention. It also shown that ferric citrate has a favourable effect on iron intake and anaemia management. In terms of safety, ferric citrate may increase the likelihood of gastrointestinal side effects.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | - Jinping Dong
- Medical College, Weifang University of Science and Technology, Weifang, China
| | - Jingliang Wu
- Medical College, Weifang University of Science and Technology, Weifang, China
| |
Collapse
|
2
|
Cekiç D, Sipahi S, Emir Arman M. Proton pump inhibitors with calcium acetate on serum phosphorus levels in hemodialysis patients. CASPIAN JOURNAL OF INTERNAL MEDICINE 2023; 14:737-740. [PMID: 38024165 PMCID: PMC10646360 DOI: 10.22088/cjim.14.4.737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Revised: 10/31/2022] [Accepted: 11/02/2022] [Indexed: 12/01/2023]
Abstract
Background The increase in serum phosphorus level is an independent risk factor for mortality in patients with chronic renal failure or undergoing dialysis due to end-stage renal disease. Proton pump inhibitors (PPI) are the general name given to agents used to suppress stomach acid. In this study, the clinical benefit of using PPIs in addition to drugs used for phosphorus control was investigated. Methods 153 patients with end-stage renal disease were included in the study. The data of the patients who had been on hemodialysis for at least 6 months and using calcium acetate for at least 1 month were recorded in the SPSS 21 program. The patients were analyzed in two groups according to whether they used PPI or not. Anamnesis, patient follow-up, laboratory, and treatment forms collected from hemodialysis centers were used. Results Of the 153 patients in the study, 49% were males and the mean age was 65.11±11.23. The mean duration of patients on dialysis was 48.5 months. Hypertension was found to be the most common comorbidity with 75.8% prevalence among the patients. The mean phosphorus levels of the patients using calcium acetate together with PPI were found to be approximately 1.2 mg/dl lower (p= 0.000). Conclusion It should be taken into account that the use of PPI together with calcium acetate, which is still common as a phosphorus binder in developing countries, can contribute to controlling phosphorus levels.
Collapse
Affiliation(s)
- Deniz Cekiç
- Department of Internal Medicine, Sakarya Research and Training Hospital, Adapazari, Sakarya, Turkey
| | - Savaş Sipahi
- Department of Nephrology, Sakarya Research and Training Hospital, Adapazari, Sakarya, Turkey
| | - Mehmet Emir Arman
- Department of Internal Medicine, Sakarya Research and Training Hospital, Adapazari, Sakarya, Turkey
| |
Collapse
|
3
|
Phosphate Frustration: Treatment Options to Complement Current Therapies. Int J Nephrol 2022; 2022:9457440. [PMID: 36045900 PMCID: PMC9424003 DOI: 10.1155/2022/9457440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Accepted: 07/16/2022] [Indexed: 11/18/2022] Open
Abstract
Hyperphosphatemia eventually develops in almost all patients with advanced chronic kidney disease and is associated with negative clinical outcomes. Thus, guidelines recommend targeting treatment to normal phosphate levels in patients with chronic kidney disease. Despite low phosphorus diets, clearance by dialysis, and phosphate binder use, many patients with chronic kidney disease on dialysis are unable to consistently achieve and maintain serum phosphate concentrations <5.5 mg/dL. A chart audit of patients on dialysis receiving phosphate binders showed that 74 to 86% were unable to consistently achieve serum phosphate ≤5.5 mg/dL over 6 months. Furthermore, although there is evidence that serum phosphate concentrations <4.5 mg/dL are associated with improved survival and cardiovascular outcomes, real-world phosphate control data suggest achieving and maintaining this goal for most patients would be extremely challenging, if not near impossible, using current therapies. As phosphate binders can only remove approximately 300 mg of the 2,500 mg or more daily dietary phosphate intake, therapeutic innovations are necessary to improve phosphate management. We present treatment options to complement current therapies including tenapanor, a novel sodium/hydrogen exchanger isoform 3 inhibitor that blocks the dominant paracellular phosphate absorption pathway and has been shown to reduce phosphate levels in several clinical trials.
Collapse
|
4
|
Gommers LMM, Hoenderop JGJ, de Baaij JHF. Mechanisms of proton pump inhibitor-induced hypomagnesemia. Acta Physiol (Oxf) 2022; 235:e13846. [PMID: 35652564 PMCID: PMC9539870 DOI: 10.1111/apha.13846] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 05/20/2022] [Accepted: 05/27/2022] [Indexed: 11/28/2022]
Abstract
Proton pump inhibitors (PPIs) reliably suppress gastric acid secretion and are therefore the first-line treatment for gastric acid-related disorders. Hypomagnesemia (serum magnesium [Mg2+ ] <0.7 mmol/L) is a commonly reported side effect of PPIs. Clinical reports demonstrate that urinary Mg2+ excretion is low in PPI users with hypomagnesemia, suggesting a compensatory mechanism by the kidney for malabsorption of Mg2+ in the intestines. However, the exact mechanism by which PPIs cause impaired Mg2+ absorption is still unknown. In this review, we show that current experimental evidence points toward reduced Mg2+ solubility in the intestinal lumen. Moreover, the absorption pathways in both the small intestine and the colon may be reduced by changes in the expression and activity of key transporter proteins. Additionally, the gut microbiome may contribute to the development of PPI-induced hypomagnesemia, as PPI use affects the composition of the gut microbiome. In this review, we argue that the increase of the luminal pH during PPI treatment may contribute to several of these mechanisms. Considering the fact that bacterial fermentation of dietary fibers results in luminal acidification, we propose that targeting the gut microbiome using dietary intervention might be a promising treatment strategy to restore hypomagnesemia in PPI users.
Collapse
Affiliation(s)
- Lisanne M. M. Gommers
- Department of Physiology, Radboud Institute for Molecular Life Sciences Radboud University Medical Center Nijmegen the Netherlands
| | - Joost G. J. Hoenderop
- Department of Physiology, Radboud Institute for Molecular Life Sciences Radboud University Medical Center Nijmegen the Netherlands
| | - Jeroen H. F. de Baaij
- Department of Physiology, Radboud Institute for Molecular Life Sciences Radboud University Medical Center Nijmegen the Netherlands
| |
Collapse
|
5
|
Quinn V, Graber J, Sedlacek M. The dietary supplement chitosan lowers serum phosphorus in a hemodialysis patient not tolerating prescription medications. Hemodial Int 2021; 26:E12-E15. [PMID: 34231314 DOI: 10.1111/hdi.12965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Accepted: 06/20/2021] [Indexed: 11/26/2022]
Abstract
Chitosan is a widely available, nontoxic, biodegradable biopolymer that binds negatively charged molecules. Its use as a dietary supplement for weight loss derives from its purported ability to bind negatively charged lipids and bile acids and prevent their gastrointestinal absorption. Here, we report the case of a dialysis patient who did not tolerate prescription phosphorus binders and who has been able to control her serum phosphorus levels for a year by taking 3.5 g of chitosan a day with meals. A quantitative analysis shows that chitosan may bind between 16 and 41 mg of phosphorus per gram, comparable to prescription binders. Chitosan may provide an over-the-counter alternative as non-calcium phosphorus binder for patients not tolerating prescription phosphorus binders because of side effects, cost, or efforts to limit their medication burden.
Collapse
Affiliation(s)
- Virginia Quinn
- Clinic 4180, Fresenius Medical Care, Lebanon, New Hampshire, USA
| | - Jyoti Graber
- Clinic 4180, Fresenius Medical Care, Lebanon, New Hampshire, USA
| | - Martin Sedlacek
- Division of Nephrology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA
| |
Collapse
|
6
|
Ooishi M, Yamada S, Itoh T, Meguro S, Yagi H, Kosugi I, Iwashita T, Shinmura K, Misawa K, Hariyama T, Kawasaki H. Diagnosis of Ion-Exchange Resin Depositions in Paraffin Sections Using Corrective Light and Electron Microscopy-NanoSuit Method. Diagnostics (Basel) 2021; 11:diagnostics11071193. [PMID: 34209027 PMCID: PMC8304092 DOI: 10.3390/diagnostics11071193] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 06/25/2021] [Accepted: 06/27/2021] [Indexed: 12/28/2022] Open
Abstract
Ion-exchange resins are commonly used to treat complications such as hyperkalemia, hyperphosphatemia, and hypercholesterolemia. Gastrointestinal complications may occur as side effects of such treatments. Sodium and calcium polystyrene sulfonate (PS-Ca) are cation-exchange resins comprising an insoluble structure that binds to potassium ions in the digestive tract and exchanges them with sodium and calcium ions, respectively, to promote their elimination. PS crystals are rhomboid, refractive, and basophilic in hematoxylin and eosin staining. To differentiate PS crystals from other ion-exchange resin crystals such as sevelamer and cholestyramine, periodic acid-Schiff, Ziehl-Neelsen, and Congo red staining are usually performed. Here, correlative light and electron microscopy (CLEM)-energy-dispersive X-ray spectroscopy and the NanoSuit method (CENM) was applied to perform a definitive identification of ion-exchange resins. CENM could detect sulfur in PS crystals without destroying the glass slides. Notably, PS retained its ion-exchange ability to bind potassium in paraffin sections. Differential diagnosis of anion-exchange resins, such as sevelamer and cholestyramine, was possible using these characteristics. The phosphorus:carbon ratio was higher in sevelamer than in cholestyramine after soaking paraffin sections in a phosphate solution. Therefore, CENM may be used for the differential pathological diagnosis of ion-exchange resins in paraffin sections.
Collapse
Affiliation(s)
- Mako Ooishi
- Institute for NanoSuit Research, Preeminent Medical Photonics Education & Research Center, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan; (M.O.); (T.H.)
| | - Satoshi Yamada
- Department of Otolaryngology/Head and Neck Surgery, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan; (S.Y.); (K.M.)
| | - Toshiya Itoh
- Department of Obstetrics and Gynecology, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan;
| | - Shiori Meguro
- Department of Regenerative & Infectious Pathology, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan; (S.M.); (H.Y.); (I.K.); (T.I.)
| | - Haruna Yagi
- Department of Regenerative & Infectious Pathology, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan; (S.M.); (H.Y.); (I.K.); (T.I.)
| | - Isao Kosugi
- Department of Regenerative & Infectious Pathology, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan; (S.M.); (H.Y.); (I.K.); (T.I.)
| | - Toshihide Iwashita
- Department of Regenerative & Infectious Pathology, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan; (S.M.); (H.Y.); (I.K.); (T.I.)
| | - Kazuya Shinmura
- Department of Tumor Pathology, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan;
| | - Kiyoshi Misawa
- Department of Otolaryngology/Head and Neck Surgery, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan; (S.Y.); (K.M.)
| | - Takahiko Hariyama
- Institute for NanoSuit Research, Preeminent Medical Photonics Education & Research Center, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan; (M.O.); (T.H.)
| | - Hideya Kawasaki
- Institute for NanoSuit Research, Preeminent Medical Photonics Education & Research Center, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka 431-3192, Japan; (M.O.); (T.H.)
- Correspondence: ; Tel.: +81-53-435-2504
| |
Collapse
|
7
|
Minakuchi H, Yoshida T, Kaburagi N, Fujino T, Endo S, Takemitsu TY, Yamashita N, Itoh H, Oya M. Proton pump inhibitors may hinder hypophosphatemic effect of lanthanum carbonate, but not of ferric citrate hydrate or sucroferric oxyhydroxide, in hemodialysis patients. Ren Fail 2021; 42:799-806. [PMID: 32779954 PMCID: PMC7472469 DOI: 10.1080/0886022x.2020.1803085] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Because end-stage renal disease patients undergoing hemodialysis frequently take acid suppressants for the treatment or prevention of gastrointestinal diseases, it is important to clarify the drug-interactions between acid suppressants and phosphate binders on the control of serum phosphate levels. In the present study, we examined whether the phosphate-lowering effects of three phosphate binders, lanthanum carbonate (LC), ferric citrate hydrate (FCH), and sucroferric oxyhydroxide (SFOH), were affected by proton pump inhibitors (PPIs) in maintenance hemodialysis patients. Laboratory data for 71 patients who had been newly prescribed one of the three phosphate binders were examined. LC at a dosage of 500 ± 217 mg/day significantly decreased serum phosphate levels by −18% in the absence of a PPI (n = 9), while a dosage of 700 ± 230 mg/day only decreased it by −3% in the presence of a PPI (n = 10). Thus, the efficacy of LC in reducing serum phosphate levels was significantly hindered by the presence of PPIs. FCH significantly decreased serum phosphate levels by −18% in the absence of a PPI (n = 7, FCH: 571 ± 189 mg/day) and by −17% in the presence of a PPI (n = 20, FCH: 638 ± 151 mg/day). The decrease in serum phosphate levels by SFOH (393 ± 197 mg/day) was −7% in the absence of a PPI (n = 7), and SFOH at a dosage of 556 ± 316 mg/day significantly decreased serum phosphate levels by −13% in the presence of a PPI (n = 18). These results suggest that the phosphate-lowering effect of LC, but not of FCH or SFOH, is diminished in the presence of PPIs in hemodialysis patients.
Collapse
Affiliation(s)
- Hitoshi Minakuchi
- Apheresis and Dialysis Center, Keio University School of Medicine, Tokyo, Japan
| | - Tadashi Yoshida
- Apheresis and Dialysis Center, Keio University School of Medicine, Tokyo, Japan
| | | | | | - Sho Endo
- Apheresis and Dialysis Center, Keio University School of Medicine, Tokyo, Japan.,Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
| | | | - Norimasa Yamashita
- Seigakai Shibuya Station Clinic, Tokyo, Japan.,Seigakai Yoyogi Station Clinic, Tokyo, Japan
| | - Hiroshi Itoh
- Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Mototsugu Oya
- Apheresis and Dialysis Center, Keio University School of Medicine, Tokyo, Japan.,Department of Urology, Keio University School of Medicine, Tokyo, Japan
| |
Collapse
|
8
|
Biruete A, Hill Gallant KM, Lindemann SR, Wiese GN, Chen NX, Moe SM. Phosphate Binders and Nonphosphate Effects in the Gastrointestinal Tract. J Ren Nutr 2020; 30:4-10. [PMID: 30846238 PMCID: PMC6722023 DOI: 10.1053/j.jrn.2019.01.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 12/03/2018] [Accepted: 01/13/2019] [Indexed: 12/21/2022] Open
Abstract
Phosphate binders are commonly prescribed in patients with end-stage kidney disease to prevent and treat hyperphosphatemia. These binders are usually associated with gastrointestinal distress, may bind molecules other than phosphate, and may alter the gut microbiota, altogether having systemic effects unrelated to phosphate control. Sevelamer is the most studied of the available binders for nonphosphate-related effects including binding to bile acids, endotoxins, gut microbiota-derived metabolites, and advanced glycation end products. Other binders (calcium- and noncalcium-based binders) may bind vitamins, such as vitamin K and folic acid. Moreover, the relatively new iron-based phosphate binders may alter the gut microbiota, as some of the iron or organic ligands may be used by the gastrointestinal bacteria. The objective of this narrative review is to provide the current evidence for the nonphosphate effects of phosphate binders on gastrointestinal function, nutrient and molecule binding, and the gut microbiome.
Collapse
Affiliation(s)
- Annabel Biruete
- Division of Nephrology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana; Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana
| | - Kathleen M Hill Gallant
- Division of Nephrology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana; Department of Nutrition Science, Purdue University, West Lafayette, Indiana
| | - Stephen R Lindemann
- Department of Nutrition Science, Purdue University, West Lafayette, Indiana; Department of Food Science, Purdue University, West Lafayette, Indiana
| | - Gretchen N Wiese
- Department of Nutrition Science, Purdue University, West Lafayette, Indiana
| | - Neal X Chen
- Division of Nephrology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - Sharon M Moe
- Division of Nephrology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana; Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana; Department of Medicine, Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana.
| |
Collapse
|
9
|
Yaguchi A, Akahane K, Tsuchioka K, Yonekubo S, Yamamoto S, Tamai Y, Tatemichi S, Takeda H. A comparison between the combined effect of calcium carbonate with sucroferric oxyhydroxide and other phosphate binders: an in vitro and in vivo experimental study. BMC Nephrol 2019; 20:465. [PMID: 31830936 PMCID: PMC6909506 DOI: 10.1186/s12882-019-1655-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Accepted: 12/03/2019] [Indexed: 02/06/2023] Open
Abstract
Background Approximately 30% of patients on dialysis received combination therapy for their phosphate binder prescription; however, few studies for combined effects of phosphate binders are reported. For the purpose of evaluating the efficacy of combination therapy, we compared the efficacy of sucroferric oxyhydroxide (PA21) combined with calcium carbonate with that of lanthanum carbonate hydrate, sevelamer hydrochloride, and ferric citrate hydrate combined with calcium carbonate. Methods For in vitro studies, calcium carbonate and the other phosphate binders alone or in combination were stirred in phosphate solution at pH 2–8 for 2 h. After centrifuging the suspension, the phosphorus level in the supernatant was determined. For in vivo studies, rats were orally administered calcium carbonate and the other phosphate binders (except for sevelamer hydrochloride) alone or in combination, followed by oral administration of phosphate solution adjusted to pH 2 or 7. Serum samples were collected from the rats at predetermined timepoints and the serum phosphorus levels were determined and analyzed using a two-way analysis of variance. Results In the in vitro study, the measured phosphate-binding capacity of combining sevelamer hydrochloride, PA21, and lanthanum carbonate hydrate with calcium carbonate was approximately equal to or greater than the theoretical values under most conditions. Furthermore, these combined effects were insensitive to pH in that order. The measured phosphate-binding capacity of ferric citrate hydrate combined with calcium carbonate was smaller than the theoretical values, and the combination did not exhibit efficacy under any of the tested conditions. In the in vivo study, the combined effect of PA21 and calcium carbonate at both pH values and that of lanthanum carbonate hydrate and calcium carbonate at pH 2 were additive. In contrast, the combined effect of lanthanum carbonate hydrate and calcium carbonate at pH 7 and that of ferric citrate hydrate and calcium carbonate at pH 2 were antagonistic. Conclusions These results suggest that coadministration of PA21 and calcium carbonate showed good and relatively stable efficacy throughout the range of the gastrointestinal pH and that combining lanthanum carbonate hydrate and ferric citrate hydrate with calcium carbonate may not produce the expected efficacy under certain conditions.
Collapse
Affiliation(s)
- Atsushi Yaguchi
- Pharmacology Research Group, Pharmacology and Pharmacokinetics Research Laboratory, R&D, Kissei Pharmaceutical Co., Ltd., 4365-1 Kashiwabara, Hotaka, Azumino, Nagano, 399-8304, Japan.
| | - Kenji Akahane
- Pharmacology Research Group, Pharmacology and Pharmacokinetics Research Laboratory, R&D, Kissei Pharmaceutical Co., Ltd., 4365-1 Kashiwabara, Hotaka, Azumino, Nagano, 399-8304, Japan
| | - Kumi Tsuchioka
- Pharmacology Research Group, Pharmacology and Pharmacokinetics Research Laboratory, R&D, Kissei Pharmaceutical Co., Ltd., 4365-1 Kashiwabara, Hotaka, Azumino, Nagano, 399-8304, Japan
| | - Saori Yonekubo
- Pharmacology Research Group, Pharmacology and Pharmacokinetics Research Laboratory, R&D, Kissei Pharmaceutical Co., Ltd., 4365-1 Kashiwabara, Hotaka, Azumino, Nagano, 399-8304, Japan
| | - Shota Yamamoto
- Pharmacology Research Group, Pharmacology and Pharmacokinetics Research Laboratory, R&D, Kissei Pharmaceutical Co., Ltd., 4365-1 Kashiwabara, Hotaka, Azumino, Nagano, 399-8304, Japan
| | - Yasuaki Tamai
- Pharmacology Research Group, Pharmacology and Pharmacokinetics Research Laboratory, R&D, Kissei Pharmaceutical Co., Ltd., 4365-1 Kashiwabara, Hotaka, Azumino, Nagano, 399-8304, Japan
| | - Satoshi Tatemichi
- Pharmacology Research Group, Pharmacology and Pharmacokinetics Research Laboratory, R&D, Kissei Pharmaceutical Co., Ltd., 4365-1 Kashiwabara, Hotaka, Azumino, Nagano, 399-8304, Japan
| | - Hiroo Takeda
- Pharmacology Research Group, Pharmacology and Pharmacokinetics Research Laboratory, R&D, Kissei Pharmaceutical Co., Ltd., 4365-1 Kashiwabara, Hotaka, Azumino, Nagano, 399-8304, Japan
| |
Collapse
|
10
|
Abstract
In this study, pH sensors were successfully fabricated on a fluorine-doped tin oxide substrate and grown via hydrothermal methods for 8 h for pH sensing characteristics. The morphology was obtained by high-resolution scanning electron microscopy and showed randomly oriented flower-like nanostructures. The TiO2 nanoflower pH sensors were measured over a pH range of 2–12. Results showed a high sensitivity of the TiO2 nano-flowers pH sensor, 2.7 (μA)1/2/pH, and a linear relationship between IDS and pH (regression of 0.9991). The relationship between voltage reference and pH displayed a sensitivity of a 46 mV/pH and a linear regression of 0.9989. The experimental result indicated that a flower-like TiO2 nanostructure extended gate field effect transistor (EGFET) pH sensor effectively detected the pH value.
Collapse
|