PBR28
Based on 1 Customer Validation
PBR28 is a translocator protein (TSPO) binding positron emission tomography (PET) radiotracer with blood-brain barrier permeability. PBR28 binds to TSPO, a marker of microglial activation and neuroinflammation, and is used for neuroinflammation imaging in brain diseases and HIV-infected individuals.
For research use only. We do not sell to patients.
- Purity: 98.91%
- CAS No.: 253307-65-2
- Formula: C21H20N2O3
- Molecular Weight:348.40
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Storage:Powder -20°C, 3 years , 4°C, 2 years ; In solvent -80°C, 6 months , -20°C, 1 month
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Biological Activity
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Chemical Information
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Solvent & Solubility
- Purity & Documentation
- References
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Help & FAQs
Biological Activity
Translocation protein, TSPO[1]
PBR28 signal elevations in chronic low back pain patients show no correlation with corresponding cerebral blood flow (CBF) changes in the same brain regions[1].
PBR28 outcome measures in non-human primates remain unaffected by CBF alterations induced by hypercapnia during radiotracer delivery or washout[1].
PBR28 binding levels in virally suppressed people living with HIV are negatively correlated with executive function and global cognitive performance[2].
MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.
| NCT Number | Sponsor | Condition | Start Date |
Phase
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|---|---|---|---|---|
| NCT01329991 | Plexxikon| | 2011-05 | PHASE1 |
Chemical Information
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CAS No. 253307-65-2
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Appearance Solid
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Molecular Weight 348.40
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Formula C21H20N2O3
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Color Off-white to light yellow
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SMILES
O=C(C)N(CC1=C(OC)C=CC=C1)C2=C(OC3=CC=CC=C3)C=CN=C2
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Shipping
Room temperature in continental US; may vary elsewhere.
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Storage
Powder -20°C 3 years 4°C 2 years In solvent -80°C 6 months -20°C 1 month
Solvent & Solubility
DMSO : 100 mg/mL (287.03 mM; Need ultrasonic; Hygroscopic DMSO has a significant impact on the solubility of product, please use newly opened DMSO)
Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month. When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.
Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month. When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.
Concentration (start) × Volume (start) = Concentration (final) × Volume (final)
Select the appropriate dissolution method based on your experimental animal and administration route.
- For the following dissolution methods, please ensure to first prepare a clear stock solution using an In Vitro approach and then sequentially add co-solvents:
- To ensure reliable experimental results, the clarified stock solution can be appropriately stored based on storage conditions. As for the working solution for In Vivo experiments, it is recommended to prepare freshly and use it on the same day.
- The percentages shown for the solvents indicate their volumetric ratio in the final prepared solution. If precipitation or phase separation occurs during preparation, heat and/or sonication can be used to aid dissolution.
Add each solvent one by one: 10% DMSO 40% PEG300 5% Tween-80 45% Saline
Solubility: 2.5 mg/mL (7.18 mM); Clear solution; Need ultrasonic
This protocol yields a clear solution of 2.5 mg/mL.
Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (25.0 mg/mL) to 400 μL PEG300, and mix evenly; then add 50 μL Tween-80 and mix evenly; then add 450 μL Saline to adjust the volume to 1 mL.
Preparation of Saline: Dissolve 0.9 g sodium chloride in ddH₂O and dilute to 100 mL to obtain a clear Saline solution.
Add each solvent one by one: 10% DMSO 90% (20% SBE-β-CD in Saline)
Solubility: 2.5 mg/mL (7.18 mM); Clear solution; Need ultrasonic
This protocol yields a clear solution of 2.5 mg/mL.
Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (25.0 mg/mL) to 900 μL 20% SBE-β-CD in Saline, and mix evenly.
Preparation of 20% SBE-β-CD in Saline (4°C, storage for one week): 2 g SBE-β-CD powder is dissolved in 10 mL Saline, completely dissolve until clear.
Please enter the basic information of animal experiments:
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Recommended: Prepare an additional quantity of animals to account for potential losses during experiments.
Please enter your animal formula composition:
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%DMSO +
Recommended: Keep the proportion of DMSO in working solution below 2% if your animal is weak.
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%+
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+%Tween-80 + +
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%Saline +
The co-solvents required include: DMSO, . All of co-solvents are available by MedChemExpress (MCE). , Tween 80. All of co-solvents are available by MedChemExpress (MCE).
Working solution concentration: 0.22 mg/mL
Method for preparing stock solution: mg drug dissolved in μL DMSO. Stock solution concentration: mg/mL.
1. Take μL DMSO stock solution;
2. Add μL .
μL , mix evenly;
3. Then add μL Tween 80, mix evenly;
4. Then add μL
Please ensure that the stock solution in the first step is dissolved to a clear state, and add co-solvents in sequence. You can use ultrasonic heating (ultrasonic cleaner, recommended frequency 20-40 kHz), vortexing, etc. to assist dissolution.
Purity & Documentation
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Data Sheet (276 KB)
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SDS (251 KB)
- English - EN (251 KB)
- Français - FR (251 KB)
- Deutsch - DE (251 KB)
- Norwegian - NO (251 KB)
- Español - ES (251 KB)
- Swedish - SV (251 KB)
- Italian - IT (251 KB)
- Portuguese - PT (251 KB)
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Handling Instructions (2659 KB)
References
[1]. Sander CY, et al. [11C]PBR28 radiotracer kinetics are not driven by alterations in cerebral blood flow. J Cereb Blood Flow Metab. 2021;41(11):3069-3084. [Content Brief]
[2]. Boerwinkle AH, et al. Comparison of [11C]-PBR28 Binding Between Persons Living With HIV and HIV-Uninfected Individuals. J Acquir Immune Defic Syndr. 2020;85(2):244-251. [Content Brief]
Complete Stock Solution Preparation Table
Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month. When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.
| Optional Solvent | Concentration Solvent Mass | 1 mg | 5 mg | 10 mg | 25 mg |
|---|---|---|---|---|---|
| DMSO | 1 mM | 2.8703 mL | 14.3513 mL | 28.7026 mL | 71.7566 mL |
| 5 mM | 0.5741 mL | 2.8703 mL | 5.7405 mL | 14.3513 mL | |
| 10 mM | 0.2870 mL | 1.4351 mL | 2.8703 mL | 7.1757 mL | |
| 15 mM | 0.1914 mL | 0.9568 mL | 1.9135 mL | 4.7838 mL | |
| 20 mM | 0.1435 mL | 0.7176 mL | 1.4351 mL | 3.5878 mL | |
| 25 mM | 0.1148 mL | 0.5741 mL | 1.1481 mL | 2.8703 mL | |
| 30 mM | 0.0957 mL | 0.4784 mL | 0.9568 mL | 2.3919 mL | |
| 40 mM | 0.0718 mL | 0.3588 mL | 0.7176 mL | 1.7939 mL | |
| 50 mM | 0.0574 mL | 0.2870 mL | 0.5741 mL | 1.4351 mL | |
| 60 mM | 0.0478 mL | 0.2392 mL | 0.4784 mL | 1.1959 mL | |
| 80 mM | 0.0359 mL | 0.1794 mL | 0.3588 mL | 0.8970 mL | |
| 100 mM | 0.0287 mL | 0.1435 mL | 0.2870 mL | 0.7176 mL |
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