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Application Protocols
The product is supplied for research use only. No in-house assay validations are provided. The following are generalized protocols commonly used for small-molecule reference inhibitors of HPPD; adapt to your system.
Enzyme inhibition assay (microplate)
Prepare a 10–50 mM DMSO stock; dilute to a 10-point half-log series. Keep final DMSO ≤1% v/v.
Buffer: 50 mM HEPES, pH 7.5, 100 mM NaCl, 0.5 mM TCEP; add 0.01% Tween-20 to reduce adsorption.
Components: Recombinant HPPD (Fe(II)-reconstituted), 4-hydroxyphenylpyruvate substrate, ascorbate, and catalase as needed.
Incubate inhibitor with enzyme 10–15 min; initiate with substrate. Read via coupled detection of homogentisate or O2 consumption. Fit IC50 with appropriate model; confirm reversibility with dilution assays.
Thermal shift (DSF)
Mix protein (2–5 µM) with SYPRO Orange and a concentration range of compound (0–100 µM; 1% DMSO max). Ramp 25–95 °C; analyze ΔTm vs. concentration.
LC–MS analytical standard preparation
Prepare 1.0 mg/mL stock in acetonitrile or DMSO. Dilute to 0.1–1000 ng/mL in 50:50 water/acetonitrile + 0.1% formic acid for calibration. Store aliquots at −20 °C; avoid multiple freeze–thaw cycles.
Controls and notes
Include vehicle and known reference inhibitor controls where available.
Verify compound stability under assay conditions by pre/post-run LC–MS.
Biological Roles
Note: The following describes biological context from the literature and is provided strictly for research and educational purposes; this product is for research use only and not for agricultural application.
Mechanistic class (literature): Bicyclopyrone belongs to the class of inhibitors of 4-hydroxyphenylpyruvate dioxygenase (HPPD), a non-heme iron enzyme in the tyrosine catabolic pathway that converts 4-hydroxyphenylpyruvate to homogentisate.
Biological consequence in plants (literature): Inhibition of HPPD disrupts plastoquinone and tocopherol biosynthesis, indirectly suppressing carotenoid formation, which leads to bleaching phenotypes in sensitive plant tissues due to photooxidative damage.
Enzyme/ligand interactions (general): HPPD inhibitors typically coordinate the active-site Fe(II) via a chelating carbonyl system and establish π–π and hydrophobic contacts with neighboring residues; the bicyclic ring modulates fit and potency by tuning sterics and lipophilicity.
Selectivity considerations: Selectivity among species derives from binding-site microenvironment differences and uptake/metabolic processing. In research, cross-species enzyme assays (plant vs. bacterial/mammalian HPPD) can be used to profile selectivity.
ADME in experimental systems (general guidance): Compounds in this class may show high plasma protein binding and limited aqueous solubility; permeation in plant cells is influenced by cuticular partitioning and transporter interactions. For in vitro enzyme assays, include low percentages of DMSO and a nonionic surfactant if needed to avoid aggregation.
Use in the lab:
Serves as a reference inhibitor to benchmark assay performance and to validate HPPD target engagement in biochemical or biophysical formats (e.g., enzyme kinetics, thermal shift, or SPR when immobilization strategies permit).
Buffer Applications
This compound is not a buffering agent and is not used to control pH in biochemical systems.
Practical guidance: When preparing assay solutions containing this small molecule, select a buffer appropriate for HPPD or your target enzyme (e.g., HEPES, Tris, phosphate) at a pH that preserves enzyme activity and compound stability. Maintain constant ionic strength and include minimal DMSO (typically ≤1–2% v/v) to keep the compound in solution.
Additives: Consider adding 0.01–0.05% nonionic surfactant (Tween 20/80) or 0.1% BSA to mitigate nonspecific adsorption of hydrophobic small molecules to plasticware.
For actual buffer recipes, consult standard biochemistry references; this product itself does not define a buffer system.
Green Alternatives
This listing is a discrete small-molecule library compound rather than a process solvent or auxiliary reagent; therefore, “green alternatives” are not typically applicable in the same way they are for commodity solvents or catalysts. Nevertheless, greener practices can be applied to its use in the lab:
Solvent footprint:
Prefer ethanol or ethyl acetate over chlorinated solvents when feasible for cleaning and preliminary solubility tests. For bioassay stocks, DMSO remains standard; minimize volumes and final assay %.
For chromatographic purification or analytics, consider water–acetonitrile gradients instead of water–methanol if acetonitrile recovery/recycling is available in your facility.
Scale minimization:
Conduct microscale assays and analytical validations to reduce chemical use and waste. Use 96/384-well plate formats for screening.
Energy and storage:
Consolidate freezer space at −20 °C and avoid repeated freeze–thaw by aliquoting, lowering energy consumption due to door openings and thermal cycling.
Waste management:
Segregate halogenated from non-halogenated waste to maximize solvent recycling. Use solid-phase extraction (SPE) to minimize solvent volumes in residue studies.
Summary: There are no direct “green substitutes” for a specific reference compound, but sustainable lab practices around solvent choice, scale, and waste handling can appreciably lessen the environmental impact of research involving this material.
Pharmaceutical Uses
No pharmacopeial or excipient status is provided for this item, and bicyclopyrone is not supplied for human or veterinary use.
Formulation context: In pharmaceutical research settings, small molecules of this type may be employed solely as reference inhibitors in enzyme assay development or as analytical standards. Any use beyond basic research (e.g., dosage form development) is outside the scope of this product.
Compliance: Not a USP/EP/JPE-listed excipient; no GMP certification is indicated. Do not use in clinical, diagnostic, or therapeutic applications.
Analytical relevance: Can serve as a method-development control for LC–UV/LC–MS workflows evaluating extraction efficiency, matrix effects, and detector response factors in complex biological or environmental matrices.
Conclusion: Treat this product strictly as a research chemical standard. For any regulated application, obtain qualified materials with appropriate certifications and regulatory coverage.
Physical Properties
Item-specific physicochemical specifications are not provided in this listing. Do not treat literature values as item specifications. Always verify on the CoA or analytical report for your lot.
Appearance: Not specified for this item; refer to CoA/Spec Sheet.
Melting point: Not specified for this item; refer to CoA/Spec Sheet.
Boiling point / decomposition: Not specified for this item; refer to CoA/Spec Sheet.
Density: Not specified for this item; refer to CoA/Spec Sheet.
Refractive index: Not applicable to solids; if oil/solution form, Not specified for this item; refer to CoA/Spec Sheet.
Organic solvents: HPPD-inhibitor scaffolds of this class are typically soluble in high-polarness aprotic solvents (DMSO, DMF, NMP) and moderately soluble in chlorinated or aromatic solvents (DCM, chloroform, toluene). Actual solubility should be confirmed experimentally.
Aqueous media: Usually low intrinsic water solubility unless salt/solubilizer systems are used.
LogP/logD, pKa: Not specified for this item; consult literature or determine experimentally for your medium/temperature.
UV/Vis characteristics: Many HPPD inhibitors exhibit strong UV absorbance in the 220–300 nm region due to aryl–carbonyl chromophores (literature, general). Exact spectra for this item are not specified; obtain from CoA or measure in your matrix.
Practical tips:
Prepare concentrated DMSO stock solutions (e.g., 10–50 mM) and dilute into assay media, keeping final DMSO ≤1–2% v/v to limit matrix effects.
If crystallinity interferes with weighing accuracy, warm gently (≤40 °C) and vortex in DMSO; avoid prolonged heating.
Quality and Grades
Grade/Purity: Not specified for this item; refer to CoA/Spec Sheet. For small-molecule screening standards, typical documentation includes assay purity by HPLC/UPLC (area%), residual solvent profile, and identity confirmation (NMR/HRMS).
What the grade means in practice (general guidance):
Research-grade reference standards are intended for discovery and method development. They are not certified to pharmacopeial monographs and are not for human or veterinary use.
If “analytical standard” or “≥98% (HPLC)” appears on your CoA, it generally indicates high chromatographic purity with low UV background suitable for LC/UV or LC–MS method development.
Quality control considerations for this scaffold type:
Identity confirmation: 1H/13C NMR consistent with proposed structure; HRMS exact mass; optional IR for carbonyl signatures.
Purity characterization: Gradient HPLC/UPLC with dual-wavelength UV; orthogonal GC (if volatile) or LC–MS for non-UV-absorbing impurities.
Stability checks: Forced degradation in acid/base/oxidant and light to understand potential impurity profiles; re-test intervals defined by storage study.
Documentation and traceability:
Batch-specific CoA should specify assay (HPLC/UPLC), water/volatile content (e.g., KF/LOD), and residual solvents if relevant. If a stabilizer is present, it will be disclosed on the label/CoA; none is specified for this item in the current listing.
Reaction and Applications
This product is offered as a research-use small molecule (compound library member). It is not primarily a synthetic reagent. Accordingly, “reaction applications” in the synthetic sense are limited. Typical uses focus on biochemical and agrochemical research:
Reference standard for biochemical assays targeting 4-hydroxyphenylpyruvate dioxygenase (HPPD) activity in plant-derived or recombinant systems (literature context for bicyclopyrone-class compounds).
Analytical spike/standard for LC–UV/LC–MS method development, residue analysis, and metabolism studies in model matrices (soils, plant extracts) where permitted for research.
SAR benchmarking: Serves as a comparator in structure–activity relationship studies of HPPD-inhibitor analogs, aiding pharmacophore mapping and docking validation.
If used in synthetic method development (general notes):
Compounds with multiple carbonyls/activated methines may undergo base- or nucleophile-promoted transformations; however, bicyclopyrone is typically employed as a target molecule, not as a synthon. Any derivatization (e.g., prodrug or conjugate formation for probes) should be developed with careful control of reaction conditions to avoid ring-opening or over-oxidation.
Practical recommendations:
For analytical recovery experiments, prepare matrix-matched standards and evaluate extraction efficiency across solvent systems (ACN/water with 0.1% formic acid; ACN/MeOH; or buffered salting-out mixes) to account for partitioning and protein binding.
Validate stability during sample prep by bracketing QC at room temperature and refrigerated autosampler conditions.
Reaction Conditions
Not typically applicable: this compound is a finished small-molecule library member rather than a reagent used to promote or participate in general organic reactions.
If conducting derivatization or conjugation research on this scaffold (general literature guidance):
Solvents: Dry polar aprotics (DMSO, DMF, NMP) for nucleophilic additions/condensations; chlorinated or aromatic solvents for electrophilic aromatic substitutions, when permitted by the substitution pattern.
Temperatures: 0–80 °C depending on transformation; avoid prolonged heating that may induce decarbonylation or ring strain release in bicyclic systems.
Acids/bases: Mild, non-nucleophilic bases (DIPEA, K2CO3) and catalytic acids (AcOH, TsOH) preferred to limit decomposition. Strong bases (alkoxides, NaH) increase risk of retro-aldol or ring-opening side reactions.
Catalysts: If cross-coupling is feasible (structure-dependent), standard Pd(0/II) systems with phosphine ligands under anhydrous, deoxygenated conditions.
These are general conditions derived from related scaffolds; they are not item-specific recommendations. Verify feasibility with small-scale test reactions and analytical confirmation.
Safety and Handling
Safety data for this specific item are limited in the product listing. Always consult the Safety Data Sheet (SDS) for authoritative hazard classification and response measures.
GHS classification: Not specified for this item; refer to SDS.
Signal word / H-statements / Pictograms: Not specified for this item; refer to SDS.
Likely hazards (general for small-molecule agrochemical research standards): May cause eye/skin/respiratory irritation. Avoid dust generation and inhalation. Handle as a potentially harmful substance.
Engineering controls: Work in a certified chemical fume hood; use local containment during weighing.
PPE: Lab coat, safety glasses or goggles, and appropriate chemically resistant gloves (e.g., nitrile). For scale-up or aerosol risk, add face protection and a fitted respirator per institutional policy.
Incompatibilities: Strong oxidizers and strong bases/acids may cause degradation; avoid moisture ingress for hydrolytically sensitive scaffolds.
Hygiene: Wash thoroughly after handling; avoid contact with skin, eyes, and clothing. Do not eat/drink/smoke in the lab.
First-aid overview (consult SDS for details):
Inhalation: Move to fresh air; seek medical attention if symptoms persist.
Skin/eye contact: Rinse with water for at least 15 minutes; remove contaminated clothing; obtain medical advice.
Ingestion: Rinse mouth; do not induce vomiting unless directed by medical personnel; seek medical attention.
Waste and spills:
Collect solid residues and contaminated absorbents in a properly labeled hazardous waste container compatible with organic solids. Decontaminate surfaces with appropriate organic solvent followed by detergent and water. Dispose in accordance with local regulations.
Solvent Selection
Given its categorization as a small-molecule library member and typical properties of HPPD-inhibitor scaffolds, solvent selection is geared toward analytical preparation and bioassay stock solutions.
Polarity class (general): Moderately lipophilic aromatic–carbonyl small molecule; expect good solubility in polar aprotics and limited water solubility.
Recommended primary solvent: DMSO for stock solutions (10–50 mM), owing to broad solvency and biochemical assay compatibility at ≤1–2% v/v.
Secondary solvents: DMF or NMP (for difficult dissolution), acetone, acetonitrile, ethyl acetate, dichloromethane, and toluene for synthetic or analytical sample prep.
Aqueous work: Use co-solvent strategies (DMSO or ethanol ≤2% v/v) and/or cyclodextrins, non-ionic surfactants (e.g., 0.01–0.1% Tween 80), or buffer pH adjustments if ionizable groups are present (determine pKa experimentally).
Small comparison (general guidance):
DMSO: Highest solvency; most common for screening. Potential to affect enzyme activity above ~2% v/v.
DMF/NMP: Strong solvency; consider cytotoxicity and extractables for bioassays.
Acetonitrile: Useful for LC; limited capacity for very hydrophobic solids.
Ethanol: Biocompatible but may not fully dissolve higher-load stocks.
Practical tips:
Warm gently (30–40 °C) and vortex/sonicate to accelerate dissolution; filter through 0.22 µm PTFE for particulate removal before LC.
Record exact solvent lot and final co-solvent fraction in assay notebooks for reproducibility.
Storage and Reconstitution
Item-specific storage and shipping conditions provided below. Where details are absent, follow general best practices for small-molecule research compounds.
Storage (as supplied): Store at −20 °C. Protect from light and moisture. Keep container tightly closed.
Shipped in: Ice chest + ice pads (per listing) to maintain low temperature during transit.
Reconstitution:
Recommended solvent for primary stocks: DMSO (analytical grade). Prepare concentrated stocks (e.g., 10–50 mM) to minimize freeze–thaw cycles.
Technique: Allow vial to equilibrate to room temperature in a desiccator before opening to prevent moisture condensation. Weigh quickly; cap promptly. Dissolve with vortexing/brief sonication; filter (0.22 µm PTFE) if needed for particulate removal in analytical uses.
Aliquoting: Dispense single-use aliquots into inert vials or low-bind tubes; purge headspace with inert gas (N2/Ar) if long-term storage is anticipated.
Stability: Not specified for this item; refer to CoA/Spec Sheet. As general guidance, store solutions at −20 °C (DMSO) and avoid repeated freeze–thaw. Assess stability by periodic HPLC/LC–MS.
Compatibility: Avoid strong acids/bases and oxidants during storage. Use amber containment to limit photodegradation risk.
Research Use Note: For research use only. Not for human or veterinary use.
Structure and Identity
Overview for SKU B1442448 (Bicyclopyrone). Item-specific identifiers are limited in the current listing; consult the CoA/Spec Sheet for definitive structural data.
Product name: Bicyclopyrone
CAS: 352010-68-5 (literature identifier for bicyclopyrone)
CID: 11188745 (literature, PubChem)
InChIKey: 6092 (as provided; appears truncated—verify against CoA/SDS)
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.
Structural features (general, literature description):
Bicyclopyrone is a synthetic small molecule herbicidal scaffold in the 4-hydroxyphenylpyruvate dioxygenase (HPPD) inhibitor class. Molecules in this class typically contain: (a) a heteroatom-rich carbonyl/oxo-containing pharmacophore (often a diketone, triketone, or related chelating motif), (b) an aryl or heteroaryl ring, and (c) a compact bicyclic or constrained alicyclic fragment that modulates lipophilicity and binding geometry.
2D depiction (verbal): an aryl-linked carbonyl-rich core connected to a constrained bicyclic aliphatic ring system; polar carbonyl oxygens flank a more hydrophobic ring framework. Exact substitution pattern should be confirmed on the CoA/SDS or primary databases.
Notes:
Where exact identifiers (full InChIKey, canonical SMILES) are required for informatics, retrieve them from the Certificate of Analysis or an authoritative chemical registry and reconcile with the batch documentation.
Synthetic Utility
This product is supplied as a target/reference compound rather than a building block. It is not typically used as a reagent or synthon in multistep synthesis.
If derivatization is pursued for probe development in research (general considerations):
Functional handle reactivity: HPPD inhibitors often contain activated carbonyl groups amenable to acylation, oxime/semicarbazone formation, or selective reduction; aryl positions may permit late-stage diversification via cross-coupling if halogens or pseudohalides are present (structure-dependent; confirm for this compound before planning chemistry).
Protection/selectivity: Maintain integrity of the chelating carbonyl motif critical for target engagement; harsh basic or nucleophilic conditions may induce ring-opening or decomposition of bicyclic fragments.
Analytical tracking: Use LC–MS to monitor small mass changes and to detect tautomeric or hydrate forms under different pH conditions.
Retrosynthetic notes (general):
Assembly of such scaffolds commonly involves construction of the aryl–carbonyl pharmacophore followed by installation of a conformationally restricted bicyclic moiety via cycloaddition, intramolecular alkylation, or ring-closing strategies (literature precedent across HPPD-inhibitor series).
Because item-specific functional group presence/positions are not detailed in this listing, confirm the exact structure from CoA/literature before planning any transformations.
Target Specificity
Target information is provided as general literature context for bicyclopyrone-class compounds; no assay validation is included with this item.
Primary biochemical target (literature): 4-Hydroxyphenylpyruvate dioxygenase (HPPD), a Fe(II)-dependent enzyme in tyrosine catabolism.
Mode of binding (general for HPPD inhibitors): Bidentate chelation to the active-site iron via a carbonyl-rich pharmacophore, reinforced by hydrophobic and π-interactions that position the inhibitor in the substrate channel.
Selectivity profile: HPPD enzymes from plants, bacteria, and mammals share conserved motifs but display pocket variations that can be exploited for selectivity. Bicyclopyrone-class inhibitors are typically optimized for plant HPPD; off-targets at research concentrations should be assessed empirically (kinase and oxidase panels if relevant to your study).
Assay notes:
Enzymatic readouts: Measure homogentisate formation or O2 consumption; alternatively, use coupled colorimetric/fluorometric assays.
Counter-screens: Include assays at varied Fe(II) concentrations and with metal chelators to confirm mechanism-based inhibition rather than nonspecific metal sequestration.
This section summarizes general target biology; consult primary literature and your in-house data to define specificity in your experimental system.
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