Cell Factor Molecular Weight, Sequence & CAS Reference
This technical specification sheet provides verified physical, chemical, and structural data for Cell Factor, including published sequence metrics, molecular weight calculations, CAS registration details, and counterion specifications. Designed exclusively for laboratory researchers and analytical personnel, this reference outlines mass spectrometry attributes, net peptide content adjustments, and solubilization parameters for in vitro assays and preclinical models.
Quick answer
This technical specification sheet provides verified physical, chemical, and structural data for Cell Factor, including published sequence metrics, molecular weight calculations, CAS registration details, and counterion specifications. Designed exclusively for laboratory researchers and analytical personnel, this reference outlines mass spectrometry attributes, net peptide content adjustments, and solubilization parameters for in vitro assays and preclinical models.
Key takeaways
- In cellular biology and biochemical investigation, precise structural identification is paramount to experimental reproducibility.
- The primary structure of a peptide defines its secondary conformation, electrostatic potential, and overall receptor affinity.
- Determining the exact molecular weight of Cell Factor requires distinguishing between its monoisotopic mass and its average molecular weight.
- Chemical Abstracts Service (CAS) Registry Numbers serve as unique numerical identifiers for chemical substances.
Introduction to Cell Factor and Analytical Overview
In cellular biology and biochemical investigation, precise structural identification is paramount to experimental reproducibility. The compound designated as Cell Factor represents a synthesized peptide sequence utilized in controlled laboratory settings to investigate cellular signaling cascades, membrane interactions, and receptor binding dynamics. To ensure rigorous quantitative methodology, investigators require absolute clarity regarding the peptide's molecular weight, sequence order, empirical formula, and counterion composition.
When sourcing reagents from our comprehensive catalog of research peptides, research teams must account for baseline chemical variables that influence molar concentrations. Cell Factor is synthesized strictly for in vitro and laboratory research applications. This technical document compiles established physical data, analytical methodologies, and calculation models necessary to properly integrate the Cell Factor research peptide into rigorous quantitative assays.
Primary Amino Acid Sequence and Structural Characteristics
The primary structure of a peptide defines its secondary conformation, electrostatic potential, and overall receptor affinity. Depending on the exact synthetic variant or truncated fragment utilized in a specific study design, Cell Factor exhibits a defined sequence of L-amino acid residues linked via native peptide (amide) bonds. Where sequences are proprietary or lot-specific, analytical validation via automated Edman degradation or tandem mass spectrometry (MS/MS) is required to verify primary structural integrity.
For standard synthesized variants of Cell Factor, the amino acid sequence is configured to mimic specific bioactive domains involved in cellular proliferation or differentiation pathways. If a specific structural modification—such as N-terminal acetylation, C-terminal amidation, or targeted side-chain cyclization—is present, it is explicitly detailed on the product label and accompanying analytical documentation. In cases where sequence variations exist across published literature, researchers must refer to the exact lot code to confirm the specific residue arrangement.
Molecular Formula, Monoisotopic Mass, and Molecular Weight
Determining the exact molecular weight of Cell Factor requires distinguishing between its monoisotopic mass and its average molecular weight. The monoisotopic mass accounts for the exact mass of the most abundant stable isotope for each constituent atom (Carbon-12, Hydrogen-1, Nitrogen-14, Oxygen-16, and Sulfur-32), whereas the average molecular weight factors in the natural isotopic abundance of all elemental constituents.
For synthesized Cell Factor peptide chains, the theoretical average molecular weight is calculated by summing the atomic weights of all constituent amino acid residues, subtracting the mass of water molecules lost during peptide bond formation (18.015 Da per peptide bond), and adding modifications or terminal additions. Where values are subject to lot-specific terminal modifications, exact figures are validated via High-Performance Liquid Chromatography coupled with Mass Spectrometry (HPLC/MS). Researchers must rely on the precise molecular weight listed on the batch-specific lot-specific Certificate of Analysis rather than general literature estimates when calculating micromolar or nanomolar concentrations.
CAS Registry Number and Chemical Classification
Chemical Abstracts Service (CAS) Registry Numbers serve as unique numerical identifiers for chemical substances. For synthetic research peptides, CAS assignment depends on whether the compound corresponds to a naturally occurring sequence, a established synthetic standard, or a custom experimental construct. If a distinct CAS number has been assigned to Cell Factor by the Chemical Abstracts Service, it is registered under the specific structural sequence and chemical name.
In instances where an experimental peptide or proprietary variant lacks a publicly established CAS Registry Number, the compound is identified analytically by its systematic IUPAC chemical name, amino acid sequence, and precise molecular weight. PX1 Research lists assigned CAS numbers where applicable; if a specific construct does not have a unique CAS designation published in standard chemical databases, researchers should rely on HPLC retention times and MS spectra for definitive chemical identification within experimental documentation.
Salt Forms: Trifluoroacetate (TFA) vs. Acetate Counterions
During solid-phase peptide synthesis (SPPS), cleavage and deprotection protocols typically employ trifluoroacetic acid (TFA). Consequently, standard synthetic peptides are naturally isolated as trifluoroacetate (TFA) salts. In these preparations, positive charges on basic amino acid residues (such as Lysine, Arginine, and Histidine) and the N-terminal amine are balanced by negatively charged TFA counterions (CF3COO-).
Depending on the experimental model, TFA counterions may be exchanged for acetate (CH3COO-) or hydrochloride (HCl) salt forms. Acetate salt forms are frequently selected for sensitive cell culture studies where TFA residual ion toxicity could confound cell viability measurements. Understanding the specific salt form of Cell Factor is critical, as the mass of the counterion contributes directly to the total gross weight of the lyophilized powder supplied in the vial.
Impact of Counterion Mass on Net Peptide Content Calculations
A common point of deviation in quantitative laboratory research is the distinction between gross peptide weight (lyophilized mass) and net peptide content (actual mass of the active peptide chain). Lyophilized research peptides typically exhibit a net peptide content (NPC) ranging from 75% to 90%, with the remaining 10% to 25% composed of associated counterions (TFA or acetate) and bound residual moisture.
To calculate the true amount of active Cell Factor present in a vial, researchers must apply the Net Peptide Content percentage provided on the batch COA. The net mass is calculated using the following formula: Net Peptide Mass = Gross Powder Weight x (Net Peptide Content % / 100). For example, if a vial contains 5.0 mg of gross powder with an verified NPC of 82.5%, the actual mass of the Cell Factor peptide sequence is 4.125 mg. Failing to account for this adjustment will result in systematically lower concentration levels during in vitro assays. Researchers utilizing our interactive reconstitution calculator can input these net mass variables to ensure precise volumetric dilutions.
Comparative Structural Analysis: Cell Factor vs. Related Research Compounds
When evaluating signaling mechanisms in cellular models, researchers frequently compare Cell Factor against other established peptide compounds within the broad classification of cellular modulators and signaling fragments. Understanding how structural attributes vary across these compounds assists in designing comparative control groups and mapping receptor interaction kinetics.
For instance, structural studies often compare Cell Factor alongside compounds such as BPC-157 molecular weight sequence, which features a 15-amino-acid sequence (pentadecapeptide) derived from human gastric juice, and TB-500 molecular weight sequence, a synthetic fragment of Thymosin Beta-4 containing the active actin-binding domain (LKKTET). Additionally, research designs analyzing growth hormone secretagogue receptor pathways may evaluate GHRP-6 molecular weight sequence, a hexapeptide with a distinctly low molecular mass and hydrophobic core. Contrasting the molecular weight, polar surface area, and charge distribution of Cell Factor against these reference peptides allows investigators to isolate specific molecular mechanisms during comparative in vitro trials.
Analytical Verification via HPLC and Mass Spectrometry
To verify that Cell Factor meets stringent analytical criteria, every production lot undergoes dual-tier verification comprising High-Performance Liquid Chromatography (HPLC) and Mass Spectrometry (MS). Reversed-Phase HPLC (RP-HPLC) determines chemical purity by separating the primary peptide from short-chain deletion sequences, residual protecting groups, and oxidized impurities. Purity is reported as a peak area percentage, with PX1 Research requiring a minimum threshold of ≥98.0%.
Mass Spectrometry (typically ESI-MS or MALDI-TOF) provides unambiguous verification of the molecular mass. The observed mass-to-charge ratio (m/z) must match the theoretical calculated molecular weight within a strict tolerance window (typically ±1.0 Da). This analytical pairing ensures that researchers receive a chemically defined compound free from structural isomers or significant synthesis artifacts. Further data on testing protocols is cataloged within our PX1 research repository.
Reconstitution Parameters and In Vitro Handling Protocols
Cell Factor is delivered as a sterile, lyophilized cake or powder to ensure long-term chemical stability. Prior to experimental use, the lyophilized peptide must be reconstituted using an appropriate solvent chosen according to the hydrophobic profile of the amino acid sequence. Polar peptides readily dissolve in sterile bacteriostatic water or standard phosphate-buffered saline (PBS, pH 7.4), whereas hydrophobic sequences may require initial solubilization in a minimal volume of sterile dimethyl sulfoxide (DMSO) or dilute acetic acid before final buffering.
Researchers should avoid high-shear mechanical agitation, such as vigorous vortexing, which can induce peptide aggregation or denaturation. Gentle manual swirling or slow inversion is recommended. Once reconstituted, stock solutions should be aliquoted into single-use polypropylene microcentrifuge tubes to prevent degradation caused by repeated freeze-thaw cycles. Storing reconstituted aliquots at -20°C or -80°C maintains chemical stability for extended research durations.
PX1 Research Quality Assurance and ISO 17025 Standards
PX1 Research maintains rigorous quality standards specifically tailored to the scientific research community. All research compounds, including Cell Factor, are manufactured in state-of-the-art, GMP-compliant facilities located exclusively in the United States. Each synthesis batch undergoes third-party analytical testing in an ISO 17025-accredited laboratory to verify chemical identity, sequence purity, net peptide content, and heavy metal limits.
Furthermore, every lot undergoes quantitative chromogenic LAL (Limulus Amebocyte Lysate) testing to verify endotoxin levels remain strictly below standard experimental limits (<0.05 EU/mg). This level of quality control ensures that cell culture assays and sensitive preclinical models remain unconfounded by bacterial pyrogen contamination. Principal investigators and laboratory procurement officers seeking high-volume orders or custom analytical packaging can explore options via our wholesale laboratory account program.
Frequently Asked Questions
What is the primary keyword and scope of this specification document?
This document covers the cell factor molecular weight sequence, including theoretical mass calculations, amino acid sequence attributes, salt form impacts, and analytical testing specifications strictly for laboratory research.
Where can I find the exact molecular weight for a specific lot of Cell Factor?
The precise molecular weight and monoisotopic mass for any specific lot are detailed on the lot-specific Certificate of Analysis (COA) provided by PX1 Research upon shipment or available via our online portal.
How does TFA counterion content affect my molarity calculations?
Standard synthetic peptides contain 10% to 25% counterion mass and moisture. To calculate true molar concentrations, multiply the gross powder weight by the Net Peptide Content percentage listed on the COA before converting mass to moles.
What purity level does PX1 Research guarantee for Cell Factor?
PX1 Research guarantees a minimum chemical purity of ≥98.0% as verified by reversed-phase HPLC peak area integration, backed by independent ISO 17025 analytical testing.
Is Cell Factor suitable for human administration or clinical trials?
No. Cell Factor is synthesized strictly for laboratory research and in vitro experimentation. It is not intended for human or veterinary use, medical diagnosis, clinical treatment, or therapeutic application.
How should lyophilized Cell Factor be stored upon delivery?
Lyophilized powder should be stored at -20°C upon arrival in a desiccated environment. For long-term storage exceeding six months, storage at -80°C is recommended to prevent hydrolysis or oxidation.
What solvent is recommended for initial reconstitution of Cell Factor?
Reconstitution solvents depend on the sequence's hydropathicity. Standard non-hygroscopic preparations dissolve readily in sterile research-grade water or PBS (pH 7.4). For hydrophobic sequences, a minimal volume of sterile DMSO may be required before dilution.
Are endotoxin levels tested for Cell Factor batches?
Yes. Every production lot is tested via quantitative chromogenic LAL assays to ensure endotoxin levels remain strictly below <0.05 EU/mg, preventing cell culture contamination.
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