Orexin-B Reconstitution Calculator
Enter the amount you want to measure. The vial buttons will highlight which vial strengths create cleaner syringe-unit measurements.
What amount do you need?
Type the target amount, then choose mg or mcg. Example: 2mg or 500mcg.
Syringe size:
Possible vial strengths:
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Example Orexin-B Titration Schedule
| Parameter | Details |
|---|---|
| Dosage (systemic) | 10 nmol/kg (rat, SC). Up to 560 pmol ICV |
| Route | Subcutaneous (SC) or intracerebroventricular (ICV) |
| Frequency | Single administration or 3× daily |
| Cycle Length | Acute only (no established cycle) |
| Half‑life | Not established; rapidly metabolized in blood |
| Reconstitution | Sterile water or saline (≥100 µg/mL). Stable for 28 days at 2–8 °C under sterile conditions |
Possible vial strengths:
What Is It?
Orexin-B
Hypothalamic peptide studied for wakefulness.
Bacteriostatic Water
Sterile water containing a bacteriostatic preservative, commonly used when preparing multi-use research vials.
How To Mix Orexin-B
1
CleanUse alcohol swabs to clean the tops of both vials.
2
Draw BAC WaterDraw the selected amount of bacteriostatic water.
3
Inject SlowlyAdd the liquid slowly down the side of the vial.
4
Swirl GentlyDo not shake. Swirl gently until dissolved.
5
Store ProperlyStore as directed and protect from heat and light.
Best Practices & Common Mistakes
Best Practices
- Use sterile technique.
- Protect from light and heat.
- Store refrigerated when appropriate.
- Use clean syringe-unit math before measuring.
Common Mistakes
- Confusing milligrams with milliliters.
- Choosing an option with awkward decimal units.
- Using too little liquid for very small measurements.
- Shaking the vial aggressively.
Orexin-B Storage & Handling
Lyophilized Powder: −20°C (−4°F) for long-term storage (up to 24 months). Refrigeration 2–8°C (36–46°F) for short-term use (up to ~3 months). Original sealed vial in the freezer is safest.
Reconstituted Solution: 2–8°C (36–46°F), use within ~7–14 days. Keep sealed, avoid light, and do not repeat freeze-thaw cycles.
Reconstituted Solution: 2–8°C (36–46°F), use within ~7–14 days. Keep sealed, avoid light, and do not repeat freeze-thaw cycles.
Frequently Asked Questions
Orexin‑B is a 28‑amino‑acid linear peptide (MW ~2900 Da) with a C‑terminal amide【1†L23-L24】. Unlike Orexin‑A, it has no disulfide bonds and is more hydrophobic. The C‑terminal amidation increases molecular weight slightly (~0.98 Da) and affects receptor selectivity — Orexin‑B binds the OX₂ receptor with ~100‑fold higher affinity than OX₁【5†L31-L32】. Your calculator cannot correct for the C‑terminal amide; you must verify the active peptide content from the CoA.
Orexin‑B is very hydrophobic (calculated pI 9.6–10.4【1†L13-L14】) and poorly soluble in plain water【6†L6-L7】. BAC water alone will not work. The standard solvent for initial dissolution is 1 % acetic acid or 1 % DMSO in water【8†L18-L19】. The recommended concentration range for complete dissolution is 0.1–1 mg/mL【8†L24-L25】. If you exceed this, the peptide will remain cloudy.
Unlikely. Orexin‑B has an extremely short plasma half‑life — about 2–5 minutes after intravenous injection【8†L34-L35】. To reach the CNS, the peptide must cross the blood‑brain barrier, where penetration is very poor【5†L39-L40】. Therefore, the standard research route is intracerebroventricular (ICV) injection, not subcutaneous【8†L2-L3】. Your calculator cannot handle ICV dosing volumes or the different bioavailability.
The solution should be stored at 4 °C for only 2–7 days; for longer storage, it must be aliquoted and frozen at –20 °C【8†L30-L31】. The short shelf life is due to the methionine residue at position 28 in the sequence【3†L25-L26】【2†L10-L11】, which is highly susceptible to oxidation. Oxidation reduces biological activity even if the calculator suggests the same number of doses remain.
Orexin‑B is a neuropeptide that mediates stress responses, cardiovascular regulation, and blood pressure elevation【3†L15-L16】. Even at a mathematically correct dose, administration of Orexin‑B can trigger significant sympathetic effects (increased heart rate, blood pressure) and stress responses that your calculator cannot predict. Always monitor vital signs, regardless of the calculated volume.
Practical takeaway: If your real goal is weight or metabolic health, the most useful next step is discussing approved treatment options with a clinician rather than relying on an unapproved compound.
Important: This tool is for informational and research-reference purposes only. Not intended for human or veterinary use.