MK-677 50mg — Vial Spec, Reconstitution Math & COA

1. MK-677 50mg Overview and Laboratory Catalog Availability

A 50mg vial of MK-677 (Ibutamoren) contains a high-purity, standardized mass of the non-peptidic ghrelin receptor agonist optimized for multi-phase laboratory research. Principal investigators and laboratory technicians typically select the 50mg unit size when conducting medium- to high-throughput cell culture assays, long-term rodent model investigations, or systematic concentration-response evaluations requiring a single batch control. Utilizing a larger mass per vial minimizes baseline variation across extended research timelines.

Please note: PX1 Research currently supplies specialized analytical preparations, including standardized solid unit formulations such as MK-677 12.5mg capsules, as well as broad research suites available through our complete peptide catalog. While pure bulk compound powder or specialized 50mg formats may periodically be reserved for customized wholesale lab accounts, understanding the volumetric mathematics, solubility constraints, and analytical requirements for a 50mg yield remains essential for standard operating procedure (SOP) development.

2. Molecular Identity and Preclinical Mechanism of Action

MK-677 (molecular formula: C27H36N4O5S, CAS number: 159752-10-0) operates as a potent, orally active, non-peptide growth hormone secretagogue. Unlike classic peptide signaling molecules that interact directly with the growth hormone-releasing hormone (GHRH) receptor, MK-677 binds selectively to the growth hormone secretagogue receptor 1a (GHS-R1a), commonly referred to as the ghrelin receptor. In vitro radioligand binding assays confirm high-affinity engagement at this receptor site without altering endogenous corticotropin or thyroid-stimulating hormone cascades.

Preclinical rodent models and cell culture experiments demonstrate that GHS-R1a activation by MK-677 triggers signal transduction pathways that result in sustained downstream release of growth hormone (GH) and insulin-like growth factor 1 (IGF-1). Because it mimics the endogenous ligand ghrelin without requiring peptidase-vulnerable peptide bonds, MK-677 exhibits exceptional metabolic stability in liquid media and bioassays, making it an invaluable tool for studying Somatotropic Axis signaling and cellular metabolism.

3. Reconstitution Math and Diluent Calculations for 50mg Vials

Accurate dilution mathematics are mandatory when preparing a 50mg vial of MK-677 for laboratory applications. Depending on the target working concentration needed for microplate dispensing or automated fluid handlers, researchers must calculate the precise volume of appropriate solvent—typically laboratory-grade dimethyl sulfoxide (DMSO) or bacteriostatic/sterile water, depending on solubility parameters and assay compatibility.

When reconstituting a 50mg solid mass, the resulting working concentrations based on added solvent volume are structured as follows:

• 1.0 mL Diluent Addition: Yields a stock concentration of 50.0 mg/mL (50 µg/µL). This ultra-concentrated stock is ideal for minimal-volume micro-aliquoting or high-density assay preparations.

• 2.0 mL Diluent Addition: Yields a stock concentration of 25.0 mg/mL (25 µg/µL). This balanced concentration offers straightforward pipetting geometry for standard 96-well culture plates.

• 3.0 mL Diluent Addition: Yields a stock concentration of 16.67 mg/mL (16.67 µg/µL). This diluted format is suitable for larger volumetric transfers where lower margin-of-error tolerances are required.

To rapidly verify concentration metrics, diluent volume requirements, and micro-liter calculations across various custom masses, research teams can utilize the interactive PX1 reconstitution calculator.

4. Aliquot Planning and Laboratory Handling SOPs

Reconstituting a full 50mg vial into a single working container exposes the active compound to repeated ambient temperature shifts and potential oxygen cross-contamination. To preserve chemical integrity and avoid enzymatic or physical degradation, laboratory SOPs should mandate immediate aliquoting following complete dissolution.

Once dissolved, the master stock solution should be partitioned into single-use, polypropylene micro-centrifuge tubes (e.g., 100 µL to 500 µL per aliquot) using sterile, filter-tipped pipettes. Aliquots designated for immediate use within 48 to 72 hours may be held at 2°C to 8°C. Long-term storage aliquots must be flash-frozen and preserved at -20°C or -80°C. Repeated freeze-thaw cycles must be rigorously avoided, as thermal cycling induces molecular precipitate formation and gradual loss of potency.

5. Comparative Benchmarking: MK-677 vs. Peptide Secretagogues

When designing comparative protocols within the broad scope of growth hormone secretagogues, researchers frequently evaluate MK-677 alongside classic peptidic GH secretagogues. Key differences in structural stability, receptor affinity, and pulse kinetics govern compound selection for specific experimental models.

For instance, synthetic peptide analogs like Ipamorelin offer highly selective GHS-R1a agonist profiles with minimal impact on appetite centers or cortisol secretion in animal models, but require short-interval administration due to enzymatic degradation. Similarly, GHRH analogs like CJC-1295 DAC act via distinct GHRH receptor pathways to extend GH release duration. In contrast, non-peptide compounds such as MK-677 demonstrate robust chemical resistance to enzymatic cleavage in vitro, permitting extended bioassay windows without complex stabilization matrices. Researchers evaluating legacy secretagogues such as GHRP-6 often pivot to MK-677 when oral/enteral stability or non-peptidic backbone kinetics are required by the experimental design.

6. Analytical Quality Verification: Reading the Lot-Matched COA

High-throughput laboratory experimentation demands absolute assurance of chemical purity and identity. Every batch produced for PX1 Research undergoes rigorous testing in independent ISO 17025 accredited laboratories. Researchers can independently access lot-matched documentation directly via our dedicated Certificate of Analysis (COA) portal.

A valid Certificate of Analysis for MK-677 must verify three key parameters: High-Performance Liquid Chromatography (HPLC) showing absolute purity equal to or exceeding 98.0%, Mass Spectrometry (MS) confirming exact molecular weight (528.67 g/mol for the free base or corresponding salt weight), and Bacterial Endotoxin Testing utilizing Limulus Amebocyte Lysate (LAL) assays to confirm levels remain below stringent research limits (<0.01 EU/mg).

7. Stability, Thermal Tolerance, and Storage Protocols

In its raw, lyophilized, or high-purity crystalline solid state, MK-677 demonstrates remarkable thermodynamic stability compared to delicate short-chain peptides. Unreconstituted solid powder stored in sealed vials with desiccant remains stable at controlled ambient laboratory temperatures (20°C to 25°C) for short-term transit, but should be stored long-term at -20°C to preserve peak analytical purity.

Reconstituted liquid solutions are far more vulnerable to ambient conditions. Light exposure can accelerate organic degradation; therefore, stock solutions should be housed in amber vials or light-blocking storage boxes. If reconstituted in organic solvents like DMSO, solutions should be kept tightly sealed in air-free containers to prevent hygroscopic absorption of atmospheric moisture, which can alter calculated stock concentrations over time.

8. Protocol Sizing: Evaluating 50mg vs. Alternative Formats

Selecting the correct format depends heavily on total experimental run times, subject volume, and pipetting automation. While a 50mg vial offers optimal unit economics for large-scale research projects, smaller exploratory studies may benefit from lower mass unit options or ready-to-use research formats.

For labs conducting precise dose-response matrix screenings without liquid automated dispensing infrastructure, utilizing standard pre-measured analytical units like MK-677 12.5mg capsules eliminates liquid handling prep steps while guaranteeing exact dry-mass distribution. Conversely, academic institutions and industrial laboratories running high-volume rodent cohorts can explore custom batch sizing and bulk order schedules through the PX1 wholesale research portal.

9. Compliance, Manufacturing Standards, and PX1 Guarantee

PX1 Research maintains an uncompromising commitment to analytical rigor, US-based quality control, and strict regulatory compliance. All research compounds supplied are manufactured in GMP-compliant facilities and tested in accredited analytical laboratories located within the United States.

Our fulfillment infrastructure operates out of modern, temperature-controlled facilities in California and Arizona, ensuring fast same-day dispatch (Monday through Friday) for fast turnaround on critical laboratory supplies. Every product distributed by PX1 Research is strictly sold as a research compound for in vitro, preclinical, and laboratory research use only. To review published mechanistic studies, chemical safety data sheets (SDS), or explore related research topics, visit our main PX1 Research Library.