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Application Protocols
Example protocol: LC–MS/MS quantification of dienogest using Dienogest-d as internal standard (general guidance)
Stock preparation
Dissolve Dienogest-d in LC–MS grade methanol or acetonitrile to 1.0 mg/mL (or per your lab SOP). Vortex to dissolve completely. Store aliquots at -20°C, protected from light.
Working internal standard (IS)
Dilute stock to 10–100 ng/mL in 50:50 water:acetonitrile (0.1% formic acid). Keep on ice or in autosampler at 4–10°C during use.
Calibration standards and QCs
Prepare parent dienogest calibrators in blank matrix or surrogate matrix across the expected range (e.g., 0.05–50 ng/mL). Spike a fixed concentration of Dienogest-d IS into all calibrators, QCs, and unknowns prior to extraction.
To 50 μL plasma add 10 μL IS, then 200 μL cold acetonitrile (0.1% formic acid). Vortex 1 min, centrifuge 10 min at 15,000 × g. Transfer supernatant, dilute with water to 20–40% organic, inject 2–10 μL.
LC–MS/MS settings (to be optimized)
Column: C18, 50 × 2.1 mm, 1.7–3 μm. Mobile A: water + 0.1% FA; Mobile B: acetonitrile. Gradient to 90% B in 4 min. ESI+. Monitor parent and IS MRM transitions with appropriate mass offset for D-labeling.
Note: Exact m/z values, collision energies, and retention times depend on the labeling pattern and instrument; determine empirically. This protocol is illustrative; adjust per your validation plan.
Dienogest is a synthetic progestin structurally related to 19-nortestosterone derivatives. In biochemical terms, progestins bind to the progesterone receptor (PR) and can modulate gene transcription pathways associated with reproductive biology. Affinities and selectivity vary among progestins and depend on assay format and conditions.
Relevance of deuteration
Deuteration does not materially alter receptor pharmacology at analytical concentrations; the primary purpose is to create a mass spectrometric handle (isotopic mass shift) for use as an internal standard.
Applications in biology research
Quantification: Enables accurate measurement of dienogest in biological matrices during ADME, PK, and exposure studies, controlling for matrix effects and extraction variability.
Metabolism: Supports identification of metabolic pathways (e.g., hydroxylation, reduction, conjugation) by providing a reference trace during LC–MS runs.
Caveats
This product is intended strictly for research use in vitro or ex vivo analytical workflows. It is not intended for human or animal use, diagnostics, or therapeutic applications.
Exact binding data, transport, and metabolism rates are assay-dependent and not specified for this item. Users should consult the primary literature or generate laboratory-specific data under their conditions.
Buffer Applications
Not typically applicable
Dienogest-d is a hydrophobic steroidal small molecule used as an LC–MS/MS internal standard rather than a buffering agent.
Practical notes for aqueous systems
When introducing into buffered aqueous phases, first dissolve in an organic co-solvent (e.g., LC–MS grade methanol or acetonitrile), then dilute into buffer to the desired final organic percentage (commonly 5–30% organic) to prevent precipitation.
Common LC–MS buffers for progestins include 0.1% formic acid in water or 2–10 mM ammonium formate/acetate. Select buffer strength to balance ionization and chromatographic needs. Verify that buffer salts are MS-compatible and volatile.
If buffer capacity is required in sample prep
For protein precipitation or SPE, mild acidification (e.g., 0.1% formic acid) is often sufficient; stronger buffering is generally unnecessary and may suppress ionization. Optimize empirically for your matrix.
Green Alternatives
Context
While the compound itself is fixed, greener choices can be made in the associated analytical solvents and workflows.
Solvent considerations (general)
Prefer methanol over acetonitrile when chromatographic performance permits; MeOH is generally considered a greener solvent with lower supply risk.
Consider aqueous-rich gradients and smaller-bore columns to reduce solvent consumption.
Explore ethanol or 2-propanol admixtures for certain extractions as ACN alternatives, acknowledging possible changes to selectivity and ionization.
Comparison (general guidance)
Acetonitrile: Excellent performance, high volatility (easy removal), but supply-sensitive; toxicity moderate.
Methanol: Renewable routes possible; slightly higher viscosity; often adequate for progestins.
2-MeTHF/CPME: Green ethers for synthesis; less relevant for LC–MS mobile phases but may be used in non-aqueous sample cleanup.
Operational practices
Miniaturize assays (e.g., 96-/384-well PPT or SPE) to cut solvent/sorbent use.
Use inline solvent recycling for isocratic scouting runs where appropriate.
Implement energy-efficient storage (maintain -20°C; avoid colder-than-needed freezers) and batch sample processing to minimize instrument idle time.
Trade-offs
Greener solvents may affect ionization efficiency and retention. Validate sensitivity and matrix effects when substituting ACN with MeOH or alcohol blends. Maintain method robustness while reducing environmental impact.
Pharmaceutical Uses
Scope for this item
This deuterated compound is intended as a research/analytical standard. No therapeutic or clinical uses are claimed or supported.
Typical roles in pharmaceutical R&D and QC (general)
Internal standard for LC–MS/MS assays in bioanalytical studies (nonclinical and clinical sample testing), enabling accurate quantitation of the non-deuterated active (dienogest).
Reference standard for method development, validation, and stability-indicating assays in formulation analysis (e.g., tablets). Assists in assessing extraction efficiency and matrix effects during content uniformity and dissolution testing by LC–MS.
System suitability and instrument performance checks: Monitors retention time stability, ionization consistency, and recovery across analytical runs.
Regulatory considerations
While some parent drugs are covered in pharmacopoeias, deuterated internal standards are typically not compendial articles. Use CoA-defined specifications and validate your method per ICH, FDA, or EMA bioanalytical guidelines.
Documentation
Maintain chain of custody, storage logs (-20°C), and lot-specific identity/purity/isotopic distribution data in your validation package. This item’s specific grade/purity and isotopic labeling details are not specified here; consult the CoA/Spec Sheet.
Physical Properties
Item-specific (from Product Data)
Appearance: Not specified for this item; refer to CoA/Spec Sheet.
Grade/Purity: Not specified for this item; refer to CoA/Spec Sheet.
General/literature information (non-deuterated dienogest; for context only)
State: Typically a solid steroidal compound at ambient conditions.
Solubility: Poorly soluble in water; soluble in polar aprotic and moderately polar organic solvents (e.g., acetonitrile, methanol, ethanol, isopropanol, DMSO) used for analytical standards.
Partitioning: High lipophilicity expected for steroidal scaffolds (logP > 2, literature trend for estrane derivatives); actual value varies by substitution.
UV characteristics: Conjugated enone generally provides UV absorbance in the near-UV range, useful for HPLC-UV detection (literature trend). Specific λmax depends on solvent and substitution and should be verified experimentally.
Isotopic effects (general)
Deuteration increases exact mass by +1.0063 u per hydrogen replaced, with negligible changes to bulk physical form. Vapor pressure and melting behavior are essentially unchanged within analytical precision for most H/D substitutions on solids.
Use in solution (practical guidance)
Prepare concentrated stocks (e.g., 0.1–1.0 mg/mL) in LC–MS grade methanol, acetonitrile, or DMSO, then dilute into mobile phase or sample matrix. Filter if particulate is visible. Minimize light and repeated freeze–thaw to preserve integrity. Confirm actual solubility and stability for your lot per CoA.
Quality and Grades
Item-specific (from Product Data)
Grade/Purity: Not specified for this item; refer to CoA/Spec Sheet.
Professional guidance on quality for deuterated standards
Isotopic enrichment: For LC–MS internal standards, high deuterium incorporation (e.g., d3–d7 or higher), with minimal hydrogen back-exchangeable positions, is critical to minimize co-elution interferences. Confirm the exact D-count and labeling positions on the CoA.
Chemical purity vs. isotopic purity: Chemical purity (e.g., >95–98% area by HPLC) and isotopic purity (atom% D at labeled positions) are distinct. Both impact quantitative accuracy. Review both specifications.
Counter-ions/solvates: Some steroidal standards may be supplied as neat solids or in solution. If provided as a solution standard (e.g., in MeOH), note solvent, concentration, and any stabilizers. None are specified for this item.
Suitability for purpose: For bioanalytical method validation (e.g., FDA/EMA), ensure the supplied lot meets acceptance criteria for identity, purity, isotopic distribution, and stability under storage and autosampler conditions.
Documentation: Retain CoA, isotopic labeling map, chromatograms, and NMR/MS identity data in your validation file. If UV cutoff, metals, residual solvents, water content, or peroxide limits are critical to your application, consult the CoA—these are not specified for this item.
Reaction and Applications
Most relevant application: stable-isotope internal standard for LC–MS/MS quantification
Deuterated dienogest is primarily used as an internal standard to correct for matrix effects, extraction recovery, and ionization variability in quantitative bioanalysis (plasma/serum, urine, tissue homogenates) and in pharmaceutical QC of formulations.
Analytical workflows (general, literature-based)
Sample preparation: Common approaches include protein precipitation (ACN or MeOH, 3–5× sample volume), liquid–liquid extraction (MTBE, ethyl acetate, or hexane/ethyl acetate), or solid-phase extraction (C18, polymeric reversed phase). Spike internal standard early in the workflow to compensate for losses.
Chromatography: Reversed-phase C18 or phenyl-hexyl columns; gradients from aqueous (0.1% formic acid or 2–10 mM ammonium formate) to ACN/MeOH. Column temperatures 30–50°C can sharpen peaks for hydrophobic steroids.
MS detection: ESI+ is typical for progestins; selected reaction monitoring (SRM/MRM) of protonated molecular ion. Set transitions to the deuterium-shifted precursor/product relative to non-deuterated dienogest. Confirm exact m/z by direct infusion of your lot.
Other uses
Metabolic studies: Isotope tracing to assess metabolic stability, phase I/II pathways, and extraction recovery.
Cross-validation: Supports accuracy in inter-lab comparisons and method transfer.
Notes
Verify labeling stability under acidic/basic conditions and at elevated autosampler temperatures; avoid back-exchange by minimizing aqueous incubation times, especially if deuterium is on exchangeable positions.
Reaction Conditions
Most relevant to this product are analytical derivatization and LC–MS conditions rather than synthetic reactions.
Ionization: ESI positive mode is common for progestins; APCI can also be effective and may reduce matrix effects for hydrophobic steroids.
Mobile phase: Water with 0.1% formic acid or 2–10 mM ammonium formate/acetate (A) and acetonitrile or methanol (B). Typical gradients reach 80–95% B within 3–6 minutes on short C18 columns (e.g., 50 × 2.1 mm, 1.7–3 μm) at 0.2–0.5 mL/min.
Column temperature: 30–50°C; elevated temperature can improve peak shape and reproducibility.
MS parameters: Optimize declustering/fragmentation voltages by direct infusion. Select SRM transitions for the deuterated IS that mirror the parent’s fragmentation but with the appropriate mass shift. Verify absence of H/D scrambling under source conditions.
Derivatization for GC–MS (optional, literature)
Hydroxyl protection: BSTFA + 1% TMCS or MSTFA at 60–70°C for 15–30 min to form TMS ethers; improves volatility. Ensure deuterium is not on exchangeable positions susceptible to loss during derivatization.
Stability testing
Assess bench-top (room temperature), autosampler (4–10°C), freeze–thaw, and long-term (-20°C) stability per regulatory guidance. This item’s specific stability data are not provided; confirm with your method validation.
Safety and Handling
Item-specific (from Product Data)
GHS Classification: Not specified for this item; refer to SDS.
Signal Word: Not specified for this item; refer to SDS.
Hazard (H) Statements: Not specified for this item; refer to SDS.
Pictograms: Not specified for this item; refer to SDS.
Storage Conditions: Store at -20°C.
Shipped In: Ice chest + Ice pads.
Research Use: For research use only.
General safety considerations (professional guidance; defer to SDS)
Potential hazards: Steroidal hormones and analogs may exhibit biological activity. Avoid inhalation, ingestion, and skin contact. Handle in a chemical fume hood or designated weighing enclosure for potent compounds.
PPE: Lab coat, nitrile gloves (double-gloving recommended for potent small molecules), safety glasses. Change gloves frequently when handling standards and biological matrices.
Handling: Use low-dust techniques for solids. Prepare solutions with LC–MS grade solvents. Cap vials promptly to limit evaporation/adsorption. Avoid cross-contamination when preparing calibration curves and QC samples.
Incompatibilities: Strong oxidizers and strong acids/bases may cause degradation. Avoid prolonged exposure to light and elevated temperature.
First aid (overview): If skin contact occurs, wash thoroughly with soap/water. If eye contact, rinse with water for 15 minutes and seek medical attention. If inhaled, move to fresh air. If ingested, seek medical attention. Always follow your institution’s EHS protocols.
Waste: Collect solutions and contaminated disposables as hazardous organic waste. Do not dispose to drain. Rinse glassware with organic solvent into waste prior to aqueous cleaning.
Solvent Selection
Applicability
This product is a hydrophobic, steroidal small molecule standard; solvent selection is primarily for preparing calibration stocks, working solutions, and spiking standards.
General/literature-based solvent guidance
Preferred solvents for stock solutions: LC–MS grade methanol, acetonitrile, or DMSO. These provide excellent solubility and compatibility with reversed-phase LC–MS/MS.
Mobile phases: Water with 0.1% formic acid or ammonium formate/acetate buffers, paired with acetonitrile or methanol. Choice depends on ionization efficiency and chromatographic separation of analyte vs. matrix components.
Miscibility and polarity: MeOH and ACN are fully miscible with water; DMSO is miscible but typically capped at ≤1–2% in final extracts to avoid peak distortion.
Practical comparisons (general)
Acetonitrile vs. methanol: ACN often yields sharper peaks and lower backpressure; MeOH can improve ionization for some steroids and offers different selectivity. Evaluate both.
DMSO: Excellent for high-concentration stocks (e.g., 1–10 mg/mL) but keep final % low to maintain chromatographic performance.
IPA: Useful as a strong eluent or sample diluent for highly hydrophobic steroids; can aid in protein crash (IPA:water) in sample prep.
Tips
Filter mobile phases (0.2 μm) and degas. Use fresh LC–MS grade solvents. Verify absence of carryover and adsorption by testing low-level spikes with and without organic modifiers (e.g., 0.2% IPA in the needle wash).
Storage and Reconstitution
Item-specific (from Product Data)
Storage Conditions: Store at -20°C.
Shipped In: Ice chest + Ice pads.
Appearance: Not specified for this item; refer to CoA/Spec Sheet.
General handling and reconstitution guidance
Upon receipt: Allow the sealed primary container to equilibrate to room temperature before opening to avoid moisture condensation. Record receipt date and lot.
Aliquoting: If supplied as a solid, quickly transfer to a low-adsorption vial and prepare small aliquots to minimize freeze–thaw cycles. If supplied as a solution, note solvent and concentration from the label/CoA.
Reconstitution (if solid): Dissolve in LC–MS grade methanol, acetonitrile, or DMSO to prepare a concentrated stock (e.g., 0.1–1 mg/mL). Vortex and, if needed, sonicate briefly. Filter through a PTFE membrane if particulates persist.
Storage of solutions: Store aliquots at -20°C, protected from light (amber vials). Avoid repeated freeze–thaw; use single-use aliquots when working at low ng/mL levels.
Stability: Specific stability data (bench-top, autosampler, long-term) are not specified for this item; verify as part of method validation. Minimize exposure to heat, light, and aqueous media to reduce risk of H/D back-exchange if labeling includes exchangeable positions.
Documentation: Retain CoA/Spec Sheet for exact isotopic labeling, concentration (if solution), and any stabilizers. Mark vials with preparation date and concentration. Research use only.
SMILES: Not specified for this item; refer to CoA/Spec Sheet.
Molecular Formula: Not specified for this item; refer to CoA/Spec Sheet.
Molecular Weight: Not specified for this item; refer to CoA/Spec Sheet.
General structural description (literature)
Compound type: Deuterium-labeled small-molecule steroid; analog of the synthetic progestin dienogest.
Core scaffold: Steroidal (estrane) tetracyclic fused-ring framework typical of 19-nortestosterone derivatives, possessing multiple fused cyclohexane/cyclopentane rings with defined stereocenters.
Key functional groups in the non-deuterated parent (dienogest; literature): one secondary alcohol (17β-OH) and one enone (3-one conjugated to Δ4 double bond); additional unsaturation on the steroid nucleus; nitrile-bearing substituent at C17 in many depictions of dienogest analogs.
Isotopic labeling: “-d” denotes replacement of one or more hydrogens with deuterium to create a stable-isotope internal standard. Exact labeling pattern and D-count vary by supplier/catalog number; verify on the CoA (highly recommended for LC–MS method setup).
2D structure (descriptive, literature)
A compact polycyclic skeleton with a partially aromatic-like A-ring enone (C3 carbonyl, C4–C5 double bond) and additional ring unsaturation, bearing a 17-substituent and a 17β-hydroxyl. Deuterium atoms reside at specific carbon positions where H→D exchange or labeled synthesis installed them; these sites impart a characteristic mass shift for MS quantitation.
Synthetic Utility
Applicability
As a labeled analog of a complex steroid, Dienogest-d is not generally used as a synthetic building block. Its principal utility is analytical. Nevertheless, deuterated steroids can be valuable mechanistic probes.
Possible research uses (general)
Isotopic tracing: Track hydrogen migration or site-specific metabolism in enzymatic transformations of the parent steroid by analyzing retention/loss of deuterium in metabolites.
Kinetic isotope effects (KIE): In specialized studies, strategically placed deuterium may reveal rate-limiting C–H bond cleavage steps. Applicability depends on labeling site(s), which must be confirmed from the CoA.
Derivatization chemistry for analytics: Formation of silyl ethers (e.g., TMS) at the hydroxyl group can enable GC–MS analysis of the parent and the IS if LC–MS is unavailable.
Caveats
Without a defined labeling map, interpretation of isotope effects is limited. Confirm labeling positions and atom% D prior to mechanistic conclusions.
For synthetic transformations of the steroid scaffold, use the unlabeled parent; preserve the deuterated material for standards to avoid depletion of isotopic purity through exchange or scrambling.
Target Specificity
Not applicable to this product type
Dienogest-d is a small-molecule chemical standard, not an antibody, enzyme, or affinity reagent. It does not have attributes such as clone, isotype, antigen epitope, or species reactivity.
Analytical specificity (general)
In LC–MS/MS assays, specificity arises from chromatographic resolution plus mass selection (precursor/product ion pairs). The deuterated internal standard adds specificity for quantitation of dienogest by co-eluting with a distinct but closely related m/z.
Verify that the deuterium labeling pattern avoids overlap with endogenous or isobaric interferences in your matrix.
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