FLGR-242 Molecular Weight, Sequence & CAS Reference
This reference sheet provides chemical, structural, and analytical specifications for researchers working with FLGR-242 in laboratory settings. Below, investigate the physical constants, salt form considerations, sequence attributes, and quality control protocols required for precise in vitro and analytical assays.
Quick answer
This reference sheet provides chemical, structural, and analytical specifications for researchers working with FLGR-242 in laboratory settings. Below, investigate the physical constants, salt form considerations, sequence attributes, and quality control protocols required for precise in vitro and analytical assays.
Key takeaways
- FLGR-242 is a specialized research compound provided strictly for in vitro laboratory evaluation, analytical benchmarking, and preclinical biochemical assays.
- The complete primary structure of a peptide dictates its tertiary conformation, charge distribution, and theoretical Isoelectric Point (pI).
- In analytical peptide chemistry, a distinction must be drawn between nominal mass, monoisotopic mass, and average molecular weight.
- Chemical Abstracts Service (CAS) Registry Numbers serve as unique numerical identifiers for chemical substances.
Overview of FLGR-242 in Laboratory Research
FLGR-242 is a specialized research compound provided strictly for in vitro laboratory evaluation, analytical benchmarking, and preclinical biochemical assays. As an engineered peptide sequence, its study centers on receptor binding dynamics, structural stability, and molecular interaction pathways within controlled experimental models. Researchers analyzing customized sequence motifs rely on precise physicochemical characterizations to ensure reproducibility across experimental runs.
When integrating FLGR-242 into assay workflows, maintaining detailed technical data regarding chemical structure, net peptide content, and molecular mass is vital. Variances in salt content or hydration state can significantly alter gravimetric calculations, making accurate baseline data essential for high-throughput screening and biophysical characterization.
FLGR-242 Molecular Structure and Amino Acid Sequence
The complete primary structure of a peptide dictates its tertiary conformation, charge distribution, and theoretical Isoelectric Point (pI). For proprietary or newly synthesized compounds like FLGR-242, specific amino acid sequence arrangements may remain protected under proprietary chemical disclosures or unassigned in public structural databases such as PubChem or UniProt.
When an amino acid sequence is proprietary or not fully published in open literature, chemical characterization relies heavily on mass spectrometry fragmentation patterns (MS/MS) and automated Edman degradation to confirm sequence fidelity per batch. Investigators seeking full sequence alignment for custom synthesis or computational docking models can review lot-specific document releases on our catalog of all peptides or consult analytical certificates provided with each research shipment.
Molecular Weight and Formula Analysis
In analytical peptide chemistry, a distinction must be drawn between nominal mass, monoisotopic mass, and average molecular weight. Monoisotopic mass reflects the sum of the masses of the most abundant naturally occurring stable isotopes for each element ($^{1}\text{H}$, $^{12}\text{C}$, $^{14}\text{N}$, $^{16}\text{O}$, $^{32}\text{S}$). Conversely, average molecular weight accounts for the atomic weight averages of elements across naturally occurring isotopic distributions.
Where explicit empirical formulas ($C_{a}H_{b}N_{c}O_{d}S_{e}$) are pending formal public registry indexation, high-resolution electrospray ionization mass spectrometry (ESI-MS) or matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) spectrometry provides the precise molecular mass determination required for molarity calculations in enzymatic or cell-free assays.
CAS Registry Number and Chemical Identifier Mapping
Chemical Abstracts Service (CAS) Registry Numbers serve as unique numerical identifiers for chemical substances. Newly characterized peptides or proprietary sequence variants may not possess an officially published CAS index number during early research phases. In such instances, chemical identity is mapped using alternative standardized descriptors, such as IUPAC condensed sequence notation, InChIKey codes, or internal manufacturer registry codes.
Researchers conducting regulatory documentation or institutional chemical inventory tracking should note that the absence of a public CAS entry does not indicate a lack of structural definition. Instead, identity is analytically proven via high-performance liquid chromatography (HPLC) retention times coupled with mass verification against target reference spectra.
Counterion Salt Forms: TFA vs. Acetate in Lyophilized Peptides
Synthetic peptides generated via Solid-Phase Peptide Synthesis (SPPS) are purified using reverse-phase HPLC buffers containing acid modifiers. Consequently, the resulting lyophilized powder is supplied as a peptide salt. The two primary counterion forms utilized in laboratory reagents are Trifluoroacetate (TFA) and Acetate ($CH_3COO^-$).
TFA salts are common due to the extensive use of trifluoroacetic acid in mobile phase purification. However, residual TFA can impact sensitive cell culture models in vitro. Acetate conversion is frequently performed when cell viability assays require reduced counterion toxicity. Crucially, counterions contribute to the overall gross weight of the cake. Net peptide content typically ranges between 70% and 90% of total dry mass, with the remainder composed of counterions and bound balance water. Researchers must adjust gravimetric measurements using the lot-specific peptide purity and content metrics found on the Certificate of Analysis (COA) prior to calculating molar concentration.
Analytical Characterization via HPLC and Mass Spectrometry
Analytical validation of FLGR-242 requires dual-stage quality control verifying both purity percentage and exact mass identity. Purity is determined through analytical RP-HPLC using C18 stationary phases under gradient elution (typically acetonitrile/water gradients containing 0.1% TFA). Target purity thresholds for research-grade material are typically set at $\ge 98\%$ by peak area integration at 214 nm or 220 nm UV wavelengths.
Identity verification utilizes ESI-MS to confirm the observed mass-to-charge ratios ($m/z$). For larger peptide molecules, multiply charged species ($[M+H]^+$, $[M+2H]^{2+}$, $[M+3H]^{3+}$) are deconvoluted using software algorithms to determine the exact monoisotopic mass. This dual-testing methodology ensures that structural artifacts, truncated sequence impurities, or deletion sequences are fully identified and quantified prior to release.
Reconstitution Metrics and Solvent Compatibility for In Vitro Assays
Reconstituting lyophilized peptides requires careful selection of aqueous buffers based on the overall net charge and hydropathicity profile of the sequence. While hydrophobic sequences may necessitate initial solubilization in a minimal volume of organic modifier such as Dimethyl Sulfoxide (DMSO) or Steri-Water, hydrophilic sequences readily dissolve in sterile 0.9% Sodium Chloride or Phosphate-Buffered Saline (PBS, pH 7.4).
To prevent aggregation or mechanical shear degradation during reconstitution, gentle swirling or inversion is recommended rather than vigorous vortexing. Researchers preparing concentration series for receptor interaction or bio-layer interferometry assays can utilize our reconstitution calculator to determine precise solvent volumes, stock molarities, and working aliquot concentrations.
Comparative Analysis: Structural Parameters Across Related Research Compounds
Evaluating structural characteristics across peptide classes allows investigators to map functional activity to structural motifs. For example, comparing FLGR-242 with established metabolic fragments such as AOD-9604 illustrates how sequence truncation and disulfide bridging influence helical stability and receptor binding kinetics.
Similarly, comparing synthetic signaling peptides like CJC-1295 or cyclic secretagogues such as Ipamorelin demonstrates the varied approaches used to enhance plasma half-life—such as tetrasubstituted amino acid modifications or D-amino acid substitutions. Understanding these comparative biochemical dynamics assists research teams in selecting appropriate positive controls and benchmarks for comparative signaling pathways.
Quality Control, Lot Verification, and Endotoxin Standards
PX1 Research enforces strict manufacturing and testing protocols for all laboratory reagents. Produced in GMP-compliant facilities within the USA, every batch of FLGR-242 undergoes comprehensive third-party testing at an ISO 17025 accredited analytical laboratory. This includes RP-HPLC purity determination, ESI-MS identity verification, and Chromogenic LAL assay testing for bacterial endotoxins.
Endotoxin levels are strictly maintained below standard research limits (< 0.01 EU/μg) to prevent confounding immunological responses in cell culture models or enzymatic assays. Batch-specific reporting ensures full traceability from synthesis to laboratory delivery, supporting rigor and reproducibility across university and industrial biomedical laboratories.
Storage, Handling, and Laboratory Safety Protocols
Lyophilized peptide cakes exhibit optimal stability when stored at $-20^\circ\text{C}$ to $-80^\circ\text{C}$ in a desiccated environment away from light. Prior to opening, vials should be allowed to equilibrate to room temperature to prevent condensation of atmospheric moisture onto the lyophilized powder, which can accelerate hydrolytic degradation.
Once reconstituted, peptide solutions should be divided into single-use working aliquots and stored at $-80^\circ\text{C}$ to avoid repeated freeze-thaw cycles. Reconstituted solutions held at $4^\circ\text{C}$ should be used within a limited window depending on the pH and intrinsic chemical stability of the sequence. For additional procurement standards and laboratory account options, research institutions can review our wholesale research portal or explore technical literature in the research library.
Frequently Asked Questions
What is the verified molecular weight of FLGR-242?
The precise molecular weight of FLGR-242 is documented on its lot-specific Certificate of Analysis via mass spectrometry. Because exact theoretical mass depends on sequence parameters and salt form, researchers should refer to the batch COA for deconvoluted ESI-MS values.
Is the exact amino acid sequence of FLGR-242 publicly disclosable?
When specific amino acid sequences fall under proprietary synthesis protocols or unassigned public registry status, sequence validation is performed via mass spectrometry fragmentation (MS/MS) and HPLC retention mapping rather than open text publication.
How does salt form (TFA vs. Acetate) affect gravimetric measurements?
Peptides are supplied as salts containing counterions such as TFA or acetate along with bound water. Net peptide content typically comprises 70%–90% of the gross cake weight. Molar calculations must account for this net content rather than assuming 100% peptide weight.
What purity level is guaranteed for PX1 Research FLGR-242?
All FLGR-242 lots provided by PX1 Research meet or exceed a 98% purity threshold as determined by analytical RP-HPLC at 214/220 nm.
Where can I obtain the Certificate of Analysis for my specific lot of FLGR-242?
Certificates of Analysis featuring third-party HPLC chromatograms, MS spectra, and endotoxin assay results are accessible directly via our dedicated COA portal using the lot number printed on the vial label.
How should FLGR-242 be reconstituted for in vitro cell culture studies?
FLGR-242 should be reconstituted using sterile buffer or Steri-Water according to its hydropathicity profile. Avoid vigorous vortexing. Utilize our online reconstitution calculator to determine exact solvent volumes and target stock concentrations.
What are the recommended long-term storage conditions for lyophilized FLGR-242?
Lyophilized FLGR-242 should be stored at -20°C or -80°C in a desiccated container protected from light. Equilibrate the vial to room temperature before opening to minimize moisture condensation.
Can FLGR-242 be used for human administration or therapeutic testing?
No. FLGR-242 is strictly sold as a research chemical intended exclusively for laboratory in vitro and preclinical investigation. It is not for human, clinical, or veterinary use.
Related pages
All products are sold strictly for laboratory and research use only. Not for human or veterinary use, diagnosis, treatment or consumption. Statements have not been evaluated by the FDA.