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CHBO4

Alias: CHBO4; CHBO-4; CHBO 4
Cat No.:V60082 Purity: ≥98%
CHBO4 is a potent, reversible, competitive, and selective hMAO-B inhibitor with an IC50 value of 0.031 μM in CHBO subseries and an Ki value of 0.010 ± 0.005 μM.
CHBO4
CHBO4 Chemical Structure CAS No.: 98991-32-3
Product category: Reactive Oxygen Species
This product is for research use only, not for human use. We do not sell to patients.
Size Price Stock Qty
10mg
25mg
50mg
100mg
250mg
Official Supplier of:
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Product Description
CHBO4 is a potent, reversible, competitive, and selective hMAO-B inhibitor with an IC50 value of 0.031 μM in CHBO subseries and an Ki value of 0.010 ± 0.005 μM. CHBO4 reduce cell damage by scavenging intracellular reactive oxygen species (ROS). CHBO4 can be used for Parkinson's Disease (PD) research.
Product Application
Overview
CHBO4 is a highly potent, reversible, and selective inhibitor of human monoamine oxidase B (hMAO-B), an enzyme that plays a crucial role in the metabolism of dopamine and other monoamines in the central nervous system. By inhibiting hMAO-B, CHBO4 elevates synaptic dopamine levels, providing a valuable tool to investigate the molecular mechanisms underlying neurological function and dysfunction. Its excellent selectivity over hMAO-A and other related enzymes allows researchers to focus specifically on MAO-B–dependent pathways, making it particularly relevant for studies on neurodegenerative disorders such as Parkinson’s disease, Huntington’s disease, and related cognitive or mood impairments.
CHBO4’s potency, reflected in an IC50 of 0.031 μM and a Ki of 0.010 ± 0.005 μM, enables effective inhibition at very low concentrations, minimizing off-target effects and allowing precise modulation of enzyme activity in cellular and animal models. The compound’s reversible nature allows transient control over MAO-B activity, facilitating studies of dynamic changes in monoamine levels and neuronal signaling without permanently altering enzyme function.

Mechanistic Insight
CHBO4 functions as a competitive inhibitor, binding to the active site of hMAO-B and directly competing with endogenous substrates. This mechanism ensures that inhibition can be finely tuned based on substrate availability, making CHBO4 an excellent probe for dissecting enzymatic regulation in vitro and in vivo. Its high selectivity prevents significant interference with hMAO-A, enabling researchers to distinguish the physiological roles of each isoform.
The compound’s reversible binding allows repeated experimental manipulation and longitudinal studies of neuronal signaling and monoamine metabolism. By inhibiting hMAO-B, CHBO4 reduces the generation of reactive oxygen species (ROS) that are produced during dopamine metabolism, providing a dual neuroprotective and biochemical modulation effect. This combination makes it suitable for research into oxidative stress, neuroinflammation, and cellular resilience under pathological conditions.

Biological and Therapeutic Relevance
hMAO-B is implicated in age-related cognitive decline and Parkinson’s disease due to its role in dopamine catabolism and oxidative stress. CHBO4’s selective inhibition enhances dopamine availability and decreases ROS production, offering a reliable model to study disease mechanisms and therapeutic strategies. Additionally, CHBO4 can be used to evaluate the efficacy of novel neuroprotective agents and combination therapies targeting dopaminergic pathways.

Research Applications
CHBO4 can be applied in multiple experimental settings:
• Examining dopamine regulation and monoamine turnover in neuronal cultures • Investigating oxidative stress and ROS generation in neurodegenerative models • Screening potential neuroprotective compounds and combination therapies • Characterizing MAO-B enzyme kinetics and inhibition profiles • Assessing behavioral and neurochemical outcomes in preclinical animal models

Handling and Storage
CHBO4 should be stored as a solid at -20°C in a low-humidity environment. Solutions prepared in DMSO should be stored at -80°C for short-term use. Proper storage and handling maintain compound stability and reproducibility.
For quotes or guidance on integrating CHBO4 into research programs, contact InvivoChem.
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Biological Activity I Assay Protocols (From Reference)
ln Vitro
In Vero cells, CHBO4 (10-500 µg/mL, 48 hours) is biosafe [1]. In Vero cells, CHBO4 (128.8 µg/mL, 10 minutes) can lower ROS production [1].
Cell Assay
Cell Cytotoxicity Assay[1]
Cell Types: Vero cells
Tested Concentrations: 10-500 µg/mL
Incubation Duration: 48 h
Experimental Results: decreased cell viability percentage with the IC50 value of 128.8 µg/mL diminished cellular density, cellular shrinkage, and blebbing exposed to concentrations (100-300 µg/mL) in Vero cells
References

[1]. Halogenated class of oximes as a new class of monoamine oxidase-B inhibitors for the treatment of Parkinson's disease: Synthesis, biochemistry, and molecular dynamics study. Comput Biol Chem. 2023 Aug;105:107899.

These protocols are for reference only. InvivoChem does not independently validate these methods.
Physicochemical Properties
Molecular Formula
C15H10OFBR
Molecular Weight
305.1417
Exact Mass
303.99
CAS #
98991-32-3
PubChem CID
5376503
Appearance
Typically exists as solid at room temperature
LogP
4.484
Hydrogen Bond Donor Count
0
Hydrogen Bond Acceptor Count
2
Rotatable Bond Count
3
Heavy Atom Count
18
Complexity
300
Defined Atom Stereocenter Count
0
SMILES
C1=CC(=CC=C1C=CC(=O)C2=CC=C(C=C2)Br)F
InChi Key
JLKQXQSMJJGERH-XCVCLJGOSA-N
InChi Code
InChI=1S/C15H10BrFO/c16-13-6-4-12(5-7-13)15(18)10-3-11-1-8-14(17)9-2-11/h1-10H/b10-3+
Chemical Name
(E)-1-(4-bromophenyl)-3-(4-fluorophenyl)prop-2-en-1-one
Synonyms
CHBO4; CHBO-4; CHBO 4
HS Tariff Code
2934.99.9001
Storage

Powder      -20°C    3 years

                     4°C     2 years

In solvent   -80°C    6 months

                  -20°C    1 month

Shipping Condition
Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)
Solubility Data
Solubility (In Vitro)
May dissolve in DMSO (in most cases), if not, try other solvents such as H2O, Ethanol, or DMF with a minute amount of products to avoid loss of samples
Solubility (In Vivo)
Note: Listed below are some common formulations that may be used to formulate products with low water solubility (e.g. < 1 mg/mL), you may test these formulations using a minute amount of products to avoid loss of samples.

Injection Formulations
(e.g. IP/IV/IM/SC)
Injection Formulation 1: DMSO : Tween 80: Saline = 10 : 5 : 85 (i.e. 100 μL DMSO stock solution 50 μL Tween 80 850 μL Saline)
*Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH ₂ O to obtain a clear solution.
Injection Formulation 2: DMSO : PEG300Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL DMSO 400 μLPEG300 50 μL Tween 80 450 μL Saline)
Injection Formulation 3: DMSO : Corn oil = 10 : 90 (i.e. 100 μL DMSO 900 μL Corn oil)
Example: Take the Injection Formulation 3 (DMSO : Corn oil = 10 : 90) as an example, if 1 mL of 2.5 mg/mL working solution is to be prepared, you can take 100 μL 25 mg/mL DMSO stock solution and add to 900 μL corn oil, mix well to obtain a clear or suspension solution (2.5 mg/mL, ready for use in animals).
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Injection Formulation 4: DMSO : 20% SBE-β-CD in saline = 10 : 90 [i.e. 100 μL DMSO 900 μL (20% SBE-β-CD in saline)]
*Preparation of 20% SBE-β-CD in Saline (4°C,1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution.
Injection Formulation 5: 2-Hydroxypropyl-β-cyclodextrin : Saline = 50 : 50 (i.e. 500 μL 2-Hydroxypropyl-β-cyclodextrin 500 μL Saline)
Injection Formulation 6: DMSO : PEG300 : castor oil : Saline = 5 : 10 : 20 : 65 (i.e. 50 μL DMSO 100 μLPEG300 200 μL castor oil 650 μL Saline)
Injection Formulation 7: Ethanol : Cremophor : Saline = 10: 10 : 80 (i.e. 100 μL Ethanol 100 μL Cremophor 800 μL Saline)
Injection Formulation 8: Dissolve in Cremophor/Ethanol (50 : 50), then diluted by Saline
Injection Formulation 9: EtOH : Corn oil = 10 : 90 (i.e. 100 μL EtOH 900 μL Corn oil)
Injection Formulation 10: EtOH : PEG300Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL EtOH 400 μLPEG300 50 μL Tween 80 450 μL Saline)


Oral Formulations
Oral Formulation 1: Suspend in 0.5% CMC Na (carboxymethylcellulose sodium)
Oral Formulation 2: Suspend in 0.5% Carboxymethyl cellulose
Example: Take the Oral Formulation 1 (Suspend in 0.5% CMC Na) as an example, if 100 mL of 2.5 mg/mL working solution is to be prepared, you can first prepare 0.5% CMC Na solution by measuring 0.5 g CMC Na and dissolve it in 100 mL ddH2O to obtain a clear solution; then add 250 mg of the product to 100 mL 0.5% CMC Na solution, to make the suspension solution (2.5 mg/mL, ready for use in animals).
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Oral Formulation 3: Dissolved in PEG400
Oral Formulation 4: Suspend in 0.2% Carboxymethyl cellulose
Oral Formulation 5: Dissolve in 0.25% Tween 80 and 0.5% Carboxymethyl cellulose
Oral Formulation 6: Mixing with food powders


Note: Please be aware that the above formulations are for reference only. InvivoChem strongly recommends customers to read literature methods/protocols carefully before determining which formulation you should use for in vivo studies, as different compounds have different solubility properties and have to be formulated differently.

 (Please use freshly prepared in vivo formulations for optimal results.)
Preparing Stock Solutions 1 mg 5 mg 10 mg
1 mM 3.2772 mL 16.3859 mL 32.7718 mL
5 mM 0.6554 mL 3.2772 mL 6.5544 mL
10 mM 0.3277 mL 1.6386 mL 3.2772 mL

*Note: Please select an appropriate solvent for the preparation of stock solution based on your experiment needs. For most products, DMSO can be used for preparing stock solutions (e.g. 5 mM, 10 mM, or 20 mM concentration); some products with high aqueous solubility may be dissolved in water directly. Solubility information is available at the above Solubility Data section. Once the stock solution is prepared, aliquot it to routine usage volumes and store at -20°C or -80°C. Avoid repeated freeze and thaw cycles.

Calculator

Molarity Calculator allows you to calculate the mass, volume, and/or concentration required for a solution, as detailed below:

  • Calculate the Mass of a compound required to prepare a solution of known volume and concentration
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An example of molarity calculation using the molarity calculator is shown below:
What is the mass of compound required to make a 10 mM stock solution in 5 ml of DMSO given that the molecular weight of the compound is 350.26 g/mol?
  • Enter 350.26 in the Molecular Weight (MW) box
  • Enter 10 in the Concentration box and choose the correct unit (mM)
  • Enter 5 in the Volume box and choose the correct unit (mL)
  • Click the “Calculate” button
  • The answer of 17.513 mg appears in the Mass box. In a similar way, you may calculate the volume and concentration.

Dilution Calculator allows you to calculate how to dilute a stock solution of known concentrations. For example, you may Enter C1, C2 & V2 to calculate V1, as detailed below:

What volume of a given 10 mM stock solution is required to make 25 ml of a 25 μM solution?
Using the equation C1V1 = C2V2, where C1=10 mM, C2=25 μM, V2=25 ml and V1 is the unknown:
  • Enter 10 into the Concentration (Start) box and choose the correct unit (mM)
  • Enter 25 into the Concentration (End) box and select the correct unit (mM)
  • Enter 25 into the Volume (End) box and choose the correct unit (mL)
  • Click the “Calculate” button
  • The answer of 62.5 μL (0.1 ml) appears in the Volume (Start) box
g/mol

Molecular Weight Calculator allows you to calculate the molar mass and elemental composition of a compound, as detailed below:

Note: Chemical formula is case sensitive: C12H18N3O4  c12h18n3o4
Instructions to calculate molar mass (molecular weight) of a chemical compound:
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Definitions of molecular mass, molecular weight, molar mass and molar weight:
  • Molecular mass (or molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)
  • Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol.
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Reconstitution Calculator allows you to calculate the volume of solvent required to reconstitute your vial.

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  • The answer appears in the Volume (to add to vial) box
In vivo Formulation Calculator (Clear solution)
Step 1: Enter information below (Recommended: An additional animal to make allowance for loss during the experiment)
Step 2: Enter in vivo formulation (This is only a calculator, not the exact formulation for a specific product. Please contact us first if there is no in vivo formulation in the solubility section.)
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Calculation results

Working concentration mg/mL;

Method for preparing DMSO stock solution mg drug pre-dissolved in μL DMSO (stock solution concentration mg/mL). Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug.

Method for preparing in vivo formulation:Take μL DMSO stock solution, next add μL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH2O,mix and clarify.

(1) Please be sure that the solution is clear before the addition of next solvent. Dissolution methods like vortex, ultrasound or warming and heat may be used to aid dissolving.
             (2) Be sure to add the solvent(s) in order.

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