MK-677 5mg — Vial Spec, Reconstitution Math & COA
MK-677 (Ibutamoren) is an orally active, non-peptide growth hormone secretagogue widely utilized in preclinical research to examine ghrelin receptor activation and endocrine signaling pathways. This reference guide outlines the technical specifications, liquid reconstitution math, micro-aliquot strategies, and analytical documentation required for managing 5mg quantity preparations in laboratory settings.
Quick answer
MK-677 (Ibutamoren) is an orally active, non-peptide growth hormone secretagogue widely utilized in preclinical research to examine ghrelin receptor activation and endocrine signaling pathways. This reference guide outlines the technical specifications, liquid reconstitution math, micro-aliquot strategies, and analytical documentation required for managing 5mg quantity preparations in laboratory settings.
Key takeaways
- In analytical and preclinical laboratories, MK-677 (Ibutamoren mesylate) is evaluated as a potent, non-peptide agonist of the growth hormone secretagogue receptor (GHS-R1a).
- Preclinical studies suggest that MK-677 mimics the endogenous peptide hormone ghrelin by selectively binding to GHS-R1a in pituitary and hypothalamic tissues.
- Accurate micro-pipetting requires precise volumetric calculations when dissolving a 5mg (5,000 µg) solid sample into liquid stock solution.
- To maintain chemical stability and concentration uniformity, laboratory protocols should account for solvent polarity and target working volumes.
MK-677 5mg Overview & Laboratory Specifications
In analytical and preclinical laboratories, MK-677 (Ibutamoren mesylate) is evaluated as a potent, non-peptide agonist of the growth hormone secretagogue receptor (GHS-R1a). Containing a total chemical mass of 5 milligrams (5,000 micrograms) per unit, a 5mg format serves as an ideal baseline quantity for preliminary binding assays, cell culture titration studies, and pilot animal model trials where small, controlled working volumes prevent reagent degradation.
While PX1 Research provides comprehensive technical data for 5mg research preparation, researchers evaluating catalog options should note that PX1 primarily supplies standardized laboratory formats such as MK-677 12.5mg capsules and high-yield bulk reference standards. If an exact 5mg lyophilized or powder vial is requested for specialized bench protocols, understanding the physical properties, molecular weight (628.77 g/mol), and precise reconstitution calculations ensures consistent dosing accurate to the microgram level across all research peptides and non-peptide secretagogues.
Mechanism of Action: Ghrelin Receptor (GHS-R1a) Agonism
Preclinical studies suggest that MK-677 mimics the endogenous peptide hormone ghrelin by selectively binding to GHS-R1a in pituitary and hypothalamic tissues. Unlike peptide-based secretagogues that require parenteral administration, MK-677 features an sp3-bound bicyclic core that exhibits high oral bioavailability and enzymatic stability in animal models. Upon receptor engagement, it activates the phospholipase C (PLC) signaling pathway, inducing intracellular calcium release and stimulating pulsatile somatotrope secretion of endogenous Growth Hormone (GH).
In vitro data indicate that sustained GHS-R1a activation by MK-677 subsequently elevates circulating Insulin-like Growth Factor 1 (IGF-1) levels via hepatic gene expression. Because MK-677 operates through distinct feedback loops, rodent models demonstrate amplified GH pulse amplitude without disrupting basal hypothalamic release patterns or depleting pituitary GH stores. Researchers analyzing somatotropic signaling pathways frequently utilize MK-677 to map long-term endocrine responses in comparison to short-acting peptide analogs.
Reconstitution Math for 5mg Mass
Accurate micro-pipetting requires precise volumetric calculations when dissolving a 5mg (5,000 µg) solid sample into liquid stock solution. Depending on the assay requirements, common diluents include Bacteriostatic Water, dimethyl sulfoxide (DMSO), or laboratory-grade polyethylene glycol. To determine final concentration, divide total mass (5mg) by total diluent volume (mL).
The mathematical breakdown for standard reconstitutions using a 5mg vial yields the following stock concentrations: • 1.0 mL Diluent: 5.0 mg/mL concentration (5,000 µg/mL). A 20 µL micro-aliquot yields 100 µg of active compound. • 2.0 mL Diluent: 2.5 mg/mL concentration (2,500 µg/mL). A 20 µL micro-aliquot yields 50 µg of active compound. • 3.0 mL Diluent: 1.67 mg/mL concentration (1,666.7 µg/mL). A 20 µL micro-aliquot yields 33.3 µg of active compound. To rapidly calculate custom concentrations for specific microplate wells or animal weight parameters, researchers can utilize the online PX1 reconstitution calculator to eliminate manual conversion errors.
Aliquot Planning and Bench Micro-Pipetting Protocols
To maintain chemical stability and concentration uniformity, laboratory protocols should account for solvent polarity and target working volumes. When preparing stock solutions from a 5mg mass, dissolving the compound completely prior to volumetric division is essential. For cell culture experiments requiring ultra-low concentrations (nanomolar ranges), serial dilutions should be performed sequentially from a primary 1 mg/mL or 2.5 mg/mL stock using sterile, endotoxin-free saline or culture media.
To minimize freeze-thaw degradation during multi-week testing cycles, primary stock solutions should be immediately aliquoted into sterile polypropylene micro-centrifuge tubes (e.g., 50 µL to 200 µL working volumes). Aliquots should be stored in secondary sealed containers at -20°C or -80°C. Avoiding repeated temperature oscillations preserves chemical structure and prevents premature hydrolysis or oxidation of the active mesylate salt.
Lot-Matched COA Verification & Purity Standards
Analytical integrity is paramount when conducting quantitative preclinical research. Every lot of MK-677 produced for PX1 Research undergoes strict analytical verification at an independent, ISO 17025-accredited testing facility prior to distribution. Purity is validated using High-Performance Liquid Chromatography (HPLC) coupled with Mass Spectrometry (MS) to verify molecular mass and rule out structural isomer impurities or residual synthesis byproducts.
Furthermore, lot-matched documentation verifies that raw active pharmaceutical ingredients (APIs) maintain a purity baseline exceeding 99.0%, alongside quantitative bacterial endotoxin testing (LAL assay). Laboratory directors can inspect full spectrum data, chromatograms, and safety parameters for every batch by visiting the centralized PX1 COA repository.
Solubility and Solvent Protocols: Liquid vs. Powder
MK-677 mesylate exhibits specific solubility profiles depending on the selected solvent system. In aqueous media, such as high-purity laboratory water or standard saline, MK-677 dissolves readily up to approximately 10 mg/mL at ambient temperature (20°C–25°C). Gentle vortexing for 30–60 seconds ensures total dissolution without requiring heat bath intervention.
For organic assay preparations or high-density stock solutions, MK-677 displays exceptional solubility in DMSO (>25 mg/mL) and absolute ethanol (>10 mg/mL). When working with in vitro cell cultures, researchers must control final solvent concentrations—typically keeping DMSO levels below 0.1% v/v in culture media to prevent non-specific cellular toxicity. For broader analytical background and safety data on non-peptide secretagogues, consult the PX1 research library.
Comparative Secretagogue Analysis: MK-677 vs. Peptide Compounds
When designing preclinical GH secretion models, researchers must select between non-peptide GHS-R agonists and classical peptide-based secretagogues. MK-677 represents a distinct class due to its prolonged biological half-life (~24 hours in animal models) and resistance to proteolysis, contrasting sharply with injectable peptides that exhibit rapid clearance rates.
A comparative analysis of common secretagogue models includes: • MK-677 (Ibutamoren): Non-peptide oral GHS-R agonist; extended receptor engagement; sustained GH and IGF-1 elevation. • Ipamorelin: Selective pentapeptide GHS-R agonist; short half-life (~2 hours); target-specific GH release with minimal impact on cortisol or prolactin. • CJC-1295 DAC: Long-acting GHRH receptor agonist; binds serum albumin to extend half-life (~6–8 days); acts synergistically when co-administered with GHS-R agonists in preclinical models. • GHRP-6: First-generation hexapeptide secretagogue; potent GHS-R activation accompanied by pronounced stimulation of ghrelin-mediated appetite signaling in rodent assays.
Storage Stability and In Vitro Degradation Parameters
In dry powder or lyophilized form, MK-677 remains chemically stable at room temperature (20°C to 25°C) for short-term transit. For extended laboratory storage exceeding 30 days, desiccated sealed vials should be maintained at 2°C to 8°C (refrigerated) or -20°C (frozen) protected from direct light exposure. Solid compound stored under dry, sub-zero conditions maintains stability for up to 24 months.
Once reconstituted into aqueous liquid stocks, stability parameters shift significantly. Aqueous solutions stored at 4°C are stable for approximately 4 to 6 weeks. Solvent-based stock solutions prepared in pure DMSO or ethanol exhibit extended shelf life when stored at -20°C. Researchers evaluating custom research quantities for large-scale laboratory programs can coordinate specialized supply through PX1 wholesale lab accounts.
Selecting Optimal Formats & Catalog Sizes
Selecting the correct compound mass depends on the experimental design, sample size, and duration of the research protocol. A 5mg vial format is ideal for low-volume binding affinity assays, assay validation runs, or micro-dosing protocols in small rodent cohorts where long-term fluid storage poses stability risks.
Conversely, when conducting high-throughput screening or longitudinal multi-week animal studies, larger catalog options—such as pre-measured MK-677 12.5mg capsules or bulk powder masses—offer superior workflow efficiency and cost effectiveness. Reviewing all available formulations in the PX1 all peptides catalog allows lab managers to align compound specifications directly with their assay infrastructure.
PX1 Quality Infrastructure and USA Logistics
PX1 Research operates strictly within a business-to-business framework, serving academic laboratories, biotechnology organizations, and independent scientific investigators across the United States. All research compounds are synthesized in state-of-the-art, GMP-compliant facilities and undergo secondary quality assurance testing within certified ISO 17025 laboratories to guarantee lot-to-lot consistency.
To ensure reagent integrity and eliminate supply chain delays, orders are fulfilled directly from domestic facilities located in California and Arizona. PX1 offers same-day shipping for all orders confirmed Monday through Friday prior to cutoff times, ensuring researchers receive verified compounds with minimal operational lead times.
Frequently Asked Questions
What is MK-677 (Ibutamoren) studied for in preclinical research?
MK-677 is evaluated in preclinical settings for its ability to selectively activate the ghrelin receptor (GHS-R1a), leading to sustained endogenously driven growth hormone (GH) and IGF-1 release without requiring parenteral administration.
How do I calculate micro-pipetting concentrations for a 5mg MK-677 vial?
Concentration is determined by dividing mass (5mg) by diluent volume. Reconstitution with 1 mL yields 5.0 mg/mL (5,000 µg/mL), 2 mL yields 2.5 mg/mL (2,500 µg/mL), and 3 mL yields 1.67 mg/mL (1,666.7 µg/mL). Researchers can use the PX1 online reconstitution calculator for exact conversions.
Does PX1 Research supply MK-677 in 5mg vial format?
PX1 provides technical reconstitution specifications for 5mg setups; however, standard catalog offerings focus on verified research formats such as pre-measured 12.5mg oral capsules and bulk reference standards. Specialized quantities can be inquired through lab accounts.
What solvents are recommended for dissolving MK-677 in assay preparations?
MK-677 mesylate is water-soluble up to ~10 mg/mL. It also dissolves readily in organic solvents such as DMSO (>25 mg/mL) and absolute ethanol (>10 mg/mL) for specialized cell culture or binding assays.
How is the purity of PX1 MK-677 verified?
Every lot undergoes independent third-party analysis at an ISO 17025-accredited laboratory using HPLC and Mass Spectrometry (MS) to verify structural identity and purity (>99.0%), alongside LAL endotoxin testing.
Where can I access the lot-matched Certificate of Analysis (COA)?
Lot-matched COAs displaying full chromatograms, purity percentages, and endotoxin levels are publicly accessible through the PX1 online COA library.
How should reconstituted MK-677 stock solutions be stored?
Aqueous solutions should be aliquoted and stored at -20°C to -80°C to prevent degradation. Avoid repeated freeze-thaw cycles by dividing stock solutions into single-use micro-centrifuge tubes.
How does MK-677 differ from peptide secretagogues like Ipamorelin?
Unlike short-acting peptide secretagogues like Ipamorelin or GHRP-6, MK-677 is a non-peptide compound with high oral bioavailability and a prolonged half-life (~24 hours), enabling extended receptor engagement in animal models.
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