1. Signaling Pathways
  2. Neuronal Signaling
  3. Monoamine Oxidase

Monoamine Oxidase

Oxidase

MAO

Monoamine oxidases (MAO) are a family of enzymes that catalyze the oxidation of monoamines. They are found bound to the outer membrane of mitochondria in most cell types in the body. They belong to the protein family of flavin-containing amine oxidoreductases. Monoamine oxidases catalyze the oxidative deamination of monoamines. Oxygen is used to remove an amine group from a molecule, resulting in the corresponding aldehyde and ammonia. Monoamine oxidases contain the covalently bound cofactor FAD and are, thus, classified as flavoproteins. Because of the vital role that MAOs play in the inactivation of neurotransmitters, MAO dysfunction is thought to be responsible for a number of psychiatric and neurological disorders. MAO-A inhibitors act as antidepressant and antianxiety agents, whereas MAO-B inhibitors are used alone or in combination to treat Alzheimer’sand Parkinson’s diseases.

Cat. No. Product Name Effect Purity Chemical Structure
  • HY-B1413
    Eprobemide
    Inhibitor 99.94%
    Eprobemide is a non-competitive reversible inhibitor of monoamine oxidase A.
    Eprobemide
  • HY-N7598
    Chrysophanol-1-O-β-gentiobioside
    Inhibitor ≥99.0%
    Chrysophanol-1-O-β-gentiobioside, an anthraquinone glycoside isolated from Cassia obtusifolia seeds. Chrysophanol-1-O-β-gentiobioside shows selective inhibition of hMAO-A isozyme activity (IC50=96.15 μM).
    Chrysophanol-1-O-β-gentiobioside
  • HY-156255
    MAO-B-IN-25
    Inhibitor 99.11%
    MAO-B-IN-25 (compound 92) is a selective MAO-B inhibitor with IC50s of 0.5 nM and 240 nM for MAO-A and MAO-B, respectively.
    MAO-B-IN-25
  • HY-B1558A
    Bifemelane hydrochloride
    Inhibitor 99.86%
    Bifemelane hydrochloride (MCI-2016) is a potent, selective and competitive inhibitor of monoamine oxidase A (MAO-A), with a Ki of 4.20 μM. Bifemelane hydrochloride also inhibits MAO-B noncompetitively with a Ki of 46.0 μM. Bifemelane hydrochloride has a potent antidepressant activity and can be used for the research of cognitive and emotional disturbances related to cerebrovascular disease.
    Bifemelane hydrochloride
  • HY-10400
    Ladostigil hemitartrate
    Inhibitor 98.90%
    Ladostigil (TV-3326) hemitartrate is an orally active dual inhibitor of cholinesterase and brain-selective monoamine oxidase (MAO), with IC50s of 37.1 and 31.8 μM for MAO-B and AChE, respectively. Ladostigil hemitartrate exhibits neuroprotective, antioxidant and anti-inflammatory activities. Ladostigil hemitartrate can be used for the research of depression and Alzheimer's disease. Ladostigil (hemitartrate) is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.
    Ladostigil hemitartrate
  • HY-149234
    MAO-B-IN-18
    Inhibitor 99.84%
    MAO-B-IN-18 is a potent and selective MAO B inhibitor with IC50s of 52 nM and 14 μM for hMAO B and hMAO A, respectively. MAO-B-IN-18 enables promising cytoprotective effects against hydrogen peroxide insults in neuroblastoma and astrocytes cultures.
    MAO-B-IN-18
  • HY-124591
    TC-2153
    Inhibitor 98.73%
    TC-2153 is a selective inhibitor of striatal-enriched protein tyrosine phosphatase (STEP), with psychotropic activity and low acute toxicity. TC-2153 increases the expression of brain-derived neurotropic factor (BDNF) in the brain. And it decreases MAOA and 5-HT1A receptors mRNA level in midbrain. TC-2153 also inhibits 5-HT2A receptor-mediated signaling.
    TC-2153
  • HY-14260
    RS 8359
    Inhibitor
    RS 8359 is a selective and reversible MAO-A inhibitor, with antidepressant activity.
    RS 8359
  • HY-114286
    PXS-5153A
    Inhibitor
    PXS-5153A is a potent, selective, orally active and fast-acting lysyl oxidase like 2/3 enzymatic (LOXL2/LOXL3) inhibitor, with an IC50 of <40 nM for LOXL2 across all mammalian species and an IC50 of 63 nM for human LOXL3. PXS-5153A could reduce crosslinks and ameliorates fibrosis.
    PXS-5153A
  • HY-10399A
    Ladostigil hydrochloride
    Inhibitor 99.94%
    Ladostigil (TV-3326) hydrochloride is an orally active dual inhibitor of cholinesterase and brain-selective monoamine oxidase (MAO), with IC50s of 37.1 and 31.8 μM for MAO-B and AChE, respectively. Ladostigil hydrochloride exhibits neuroprotective, antioxidant and anti-inflammatory activities. Ladostigil can be used for the research of depression and Alzheimer's disease. Ladostigil (hydrochloride) is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.
    Ladostigil hydrochloride
  • HY-14200
    (S)-Rasagiline
    Inhibitor 99.80%
    (S)-Rasagiline (TVP1022) is the relatively inactive S-enantiomer form of Rasagiline. Rasagiline is a highly potent selective irreversible MAO inhibitor with IC50s of 4.43 nM and 412 nM for rat brain MAO B and A activity, respectively. (S)-Rasagiline is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.
    (S)-Rasagiline
  • HY-100975
    TB5
    Inhibitor 99.96%
    TB5 is a potent, selective and reversible inhibitor of hMAO-B with a Ki value of 0.11±0.01 μM.
    TB5
  • HY-151466
    HIF-1α-IN-5
    Inhibitor 99.95%
    HIF-1α-IN-5 is a HIF-1α inhibitor with an IC50 value of 24 nM (in HEK293T cell). HIF-1α-IN-5 also inhibits MAO-A activity. HIF-1α-IN-5 downregulates VEGF and PDK1 mRNA expressions under hypoxia. HIF-1α-IN-5 can be used in the research of cancer.
    HIF-1α-IN-5
  • HY-122812
    Maesopsin
    Inhibitor 99.66%
    Maesopsin is a phenolic compound, that can be isolated from Hoveniae Lignum.
    Maesopsin
  • HY-144635
    Nrf2-ARE/hMAO-B/QR2 modulator 1
    Inhibitor 98.44%
    Nrf2-ARE/hMAO-B/QR2 modulator 1 is a Resveratrol-based multitarget-directed ligands with IC50s of 8.05, 9.83 and 0.57 μM for hMAO-B, NRF2 and QR2. Nrf2-ARE/hMAO-B/QR2 modulator 1 has neuroprotection, decreasing ROS production in okadaic acid-treated mice hippocampal slices.
    Nrf2-ARE/hMAO-B/QR2 modulator 1
  • HY-13339
    Brofaromine
    Inhibitor 99.60%
    Brofaromine (CGP 11305A) is a monoamine oxidase (MAO) inhibitor with IC50 of 0.2 μM for MAO-A.
    Brofaromine
  • HY-14201
    Lazabemide
    Inhibitor 99.95%
    Lazabemide (Ro 19-6327) is a selective, reversible inhibitor of monoamine oxidase B (MAO-B) (IC50=0.03 μM) but less active for MAO-A (IC50>100 μM). Lazabemide ?inhibits monoamine uptake at high concentrations, the IC50 values are 86 μM, 123 μM and >500 μM for noradrenalin, serotonin and dopamine uptake, respectively. Lazabemide can be used for the research of parkinson and?alzheimer′s disease.
    Lazabemide
  • HY-N9329
    Glicoricone
    Inhibitor
    Glicoricone, a phenolic compound, is isolated from a species of licorice. Glicoricone is an inhibitor of monoamine oxidase (MAO), with an IC50 of 140 μM. Glicoricone binds to estrogen receptor (ER) and shows estrogen antagonist activity.
    Glicoricone
  • HY-B1111
    Amitraz
    Inhibitor 99.65%
    Amitraz is a non-systemic acaricide and insecticide with alpha-adrenergic agonist activity that interacts with octopamine receptors in the central nervous system and inhibits monoamine oxidase and prostaglandin synthesis.
    Amitraz
  • HY-101392S
    Harmane-d
    Inhibitor 98.01%
    Harmane-d is the deuterium labeled Harmane. Harmane, a β-Carboline alkaloid (BCA), is a potent neurotoxin that causes severe action tremors and psychiatric manifestations. Harmane shows 1000-fold selectivity for I1-Imidazoline receptor (IC50=30 nM) over α2-adrenoceptor (IC50=18 μM). Harmane is also a potent and selective inhibitor of monoamine oxidase (MAO) (IC50s=0.5 and 5 μM for human MAO A/B, respectively)[1][2][3][4].
    Harmane-d
Cat. No. Product Name / Synonyms Application Reactivity

MAO-A

MAO-B

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Monoamine Oxidase Inhibitors
Product NameMAO-AMAO-BPurity    
Tranylcypromine hydrochloride
MAO-A, IC50: 2.3 μM
MAO-B, IC50: 0.95 μM
99.90%
Selegiline hydrochloride 
MAO-B, IC50: 51 nM
99.94%
Pargyline
MAO-A, Ki: 13 μM
MAO-B, Ki: 0.5 μM
99.92%
Pargyline hydrochloride
MAO-A, Ki: 13 μM
MAO-B, Ki: 0.5 μM
99.91%
Norharmane
MAO-A, IC50: 6.5 μM
MAO-B, IC50: 4.7 μM
99.46%
Rasagiline
rMAO-A, IC50: 412 nM
rMAO-B, IC50: 4.43 nM
99.88%
Safinamide
MAO-A, IC50: 580 μM
MAO-B, IC50: 98 nM
99.89%
Moclobemide
MAO-A, IC50: 6.061
 99.90%
Tedizolid phosphate
MAO-A
MAO-B
99.65%
Rasagiline mesylate
rMAO-A, IC50: 412 nM
rMAO-B, IC50: 4.43 nM
99.82%
Harmane
hMAO-A, IC50: 0.5 μM
MAO-B, IC50: 5 μM
99.91%
Safinamide mesylate
MAO-A, IC50: 580 nM
MAO-B, IC50: 98 nM
99.87%
Xanthone
MAO-A, IC50: 0.84 μM
 99.97%
Osthenol
hMAO-A, Ki: 0.26 μM
hMAO-A, IC50: 0.74 μM
 99.27%
(E)-8-(3-Chlorostyryl)caffeine 
MAO-B, Ki: 70 nM
99.4%
Methyl citrate 
MAO-B, IC50: 0.23 mM
≥98.0%
LSD1/HDAC6-IN-2
MAO-A, IC50: 5 nM
MAO-B, IC50: 6600 nM
99.66%
MAO-A inhibitor 1
MAO-A, IC50: 100 μM
 98.55%
MAO-IN-M30 dihydrochloride
MAO-A, IC50: 37 nM
MAO-B, IC50: 57 nM
99.25%
Chrysophanol-1-O-β-gentiobioside
MAO-A, IC50: 96.15 μM
 ≥99.0%
MAO-B-IN-25
MAO-A, IC50: 240 nM
MAO-B, IC50: 0.5 nM
99.11%
Bifemelane hydrochloride
MAO-A, Ki: 4.2 μM
MAO-B, Ki: 46 μM
99.86%
Ladostigil hemitartrate 
MAO-B, IC50: 37.1 nM
98.90%
MAO-B-IN-18
hMAO-A, IC50: 14 μM
hMAO-B, IC50: 52 nM
99.84%
TC-2153
MAO-A
 98.73%
Ladostigil hydrochloride 
MAO-B, IC50: 37.1 μM
99.94%
MAO-A/5-HT2AR-IN-1
MAO-A, IC50: 0.004 ± 0. μM
MAO-B, IC50: 1.05 ± 0.0 μM
99.71%
Ladostigil 
MAO-B, IC50: 37.1 μM
MAO-B-IN-8 
MAO-B
98.03%
Tetrahydroharmine 
MAO-B, IC50: 74 nM
98.00%
ASS234
MAO-A, IC50: 5.2 nM
MAO-B, IC50: 43 nM
99.6%
(Rac)-Rasagiline 
MAO-B
Tetrindole mesylate
MAO-A
 99.93%
MC4762 
MAO-B, IC50: 0.182 μM
Selegiline 
MAO-B, IC50: 51 nM
MAO A/HDAC-IN-1
MAO-A
 
hMAO-B-IN-7 
hMAO-B, IC50: 0.79 μM
MAO-B-IN-39
MAO-A, IC50: >30 μM
MAO-B, IC50: 3.61 μM
MAO-B-IN-21 
MAO-B
MAO-B-IN-37
MAO-A, IC50: 16 μM
MAO-B, IC50: 0.27 μM
Befloxatone
MAO-A, IC50: 4 nM
MAO-B, IC50: 300 nM
Dual AChE-MAO B-IN-2 
MAO-B, Ki: 4.5 μM
AChE-IN-60
MAO-A, IC50: 353 nM
MAO-B, IC50: 716 nM
MAO-A inhibitor 2
MAO-A, IC50: 14.3 μM
MAO-B, IC50: 106 μM
MAO-B-IN-9 
MAO-B, IC50: 0.178 ± 0. μM
99.70%
ChEs/MAOs-IN-2
MAO-A, IC50: 0.10 μM
MAO-B, IC50: 0.20 μM
Esuprone
MAO-A, IC50: 7.3 nM
 
LSD1-IN-17
MAO-A, IC50: 0.028 ± 0. μM
MAO-B, IC50: 0.820 ± 0. μM
(±)-Amiflamine
MAO-A, pIC50: 5.57
 99.23%
MAO-B-IN-13 
MAO-B, IC50: 10 nM
Cimoxatone
MAO-A
 
hMAO-B-IN-11 
hMAO-B, IC50: 0.11 μM
LSD1-IN-34
MAO-A, IC50: 18.46 nM
MAO-B, IC50: 8481.67 nM
PSB-1491 
hMAO-B, IC50: 0.0386 nM
Neuroinflammatory-IN-2 
MAO-B, IC50: 10.30 μM
AChE/BChE/MAO-B-IN-3 
hMAO-B, IC50: 0.0359 μM
MAO-B-IN-33
MAO-A, IC50: 26.805 μM
MAO-B, IC50: 0.021 μM
MAO-IN-6 
MAO-B, IC50: 0.09 μM
AChE/MAO-IN-1
hMAO-A, IC50: 0.1108 μM
hMAO-A, Ki: 0.1069 μM
hMAO-B, IC50: 0.0409 μM
hMAO-B-IN-2 
MAO-B, IC50: 4 nM
MAO-B-IN-16
hMAO-A, IC50: >100 μM
hMAO-B, IC50: 1.55 μM
1-Methyl-2-undecyl-4(1H)-quinolone 
MAO-B, IC50: 15.3 μM
MAO-B, Ki: 9.91 μM
LSD1-IN-15
MAO-A, IC50: 0.028 ± 0. μM
MAO-B, IC50: 0.327 ± 0. μM
CHBO4 
hMAO-B, IC50: 0.031 μM
MAO-B-IN-7 
MAO-B, IC50: 0.3 μM
MAO-B-IN-14 
hMAO-B, IC50: 0.95 μM
hMAO-B, Ki: 0.55 μM
AChE/BChE/MAO-B-IN-2 
MAO-B, IC50: 48.2 nM
MAO-B ligand-1
hMAO-A, IC50: 22.57 nM
hMAO-B, IC50: 3.83 nM
AChE/MAO-B-IN-3 
hMAO-B, IC50: 0.0456 μM
MAO-B-IN-11 
MAO-B, IC50: 1.3 μM
MAO-B-IN-10
MAO-A, IC50: 15.9 ± 0.1 μM
MAO-B, IC50: 5.3 ± 0.22 μM
Multitarget AD inhibitor-2 
MAO-B, IC50: 0.45 μM
Desoxypeganine
MAO-A, IC50: 2 μM
 
HDAC1/MAO-B-IN-1 
MAO-B, IC50: 99.0 nM
MAO-B-IN-3 
MAO-B, IC50: 96 nM
MAO-B-IN-5
MAO-A, IC50: 0.204 μM
MAO-B, IC50: 34.190 μM
LSD1-IN-26
MAO-A, IC50: 1234.57 nM
MAO-B, IC50: 3819.27 nM
Dual AChE-MAO B-IN-3 
MAO-B, IC50: 0.41 ± 0.0 μM
2-PAT
MAO-A, IC50: 0.721 μM
MAO-B, IC50: 14.6 μM
Harmane (Standard)
hMAO-A
MAO-B
MAO-B-IN-40
hMAO-A, IC50: >100 μM
hMAO-B, IC50: 0.493 μM
NDs-IN-1
hMAO-A
hMAO-B
AChE/BChE/MAO-B-IN-5 
MAO-B, IC50: 0.11 μM
MAO-B-IN-20
MAO-A, IC50: >10 μM
MAO-B, IC50: 0.037 μM
MAO-B-IN-38
MAO-A, IC50: 21.46 μM
MAO-B, IC50: 0.03 μM
AChE/BChE-IN-6 
hMAO-B, IC50: > 100 μM
1-Methyl-2-nonyl-4(1H)-quinolone
MAO-A
MAO-B
MAO-B-IN-17
hMAO-A, IC50: >100 μM
hMAO-B, IC50: 5.08 μM
≥99.0%
MAO-B-IN-32 
MAO-B, IC50: 16 nM
AChE/BuChE/MAO-B-IN-1 
hMAO-B, IC50: 1.11 μM
Moclobemide N-Oxide
MAO-A
 
FTEAA
MAO-A, IC50: 0.52 μM
MAO-B, IC50: 1.02 μM
MAO A/HSP90-IN-2
MAO-A, IC50: 4.58 μM
 
MAO-B-IN-6
MAO-A, IC50: 46.365 μM
MAO-B, IC50: 0.019 μM
MAO-B-IN-30
MAO-A, IC50: 19.176 μM
MAO-B, IC50: 0.082 μM
98.53%
Monoamine Oxidase B inhibitor 5
hMAO-A, IC50: 26014 nM
hMAO-B, IC50: 67.3 nM
Monoamine Oxidase B inhibitor 6 
MAO-B, IC50: 0.11 μM
MAO-B, Ki: 0.072 μM
LSD1-IN-12
MAO-A, Ki: 2.3 μM
MAO-B, Ki: 3.5 μM
AChE/BChE/MAO-B-IN-1 
MAO-B, IC50: 26.1 μM
99.57%
MAO-A/B-IN-3
MAO-A, IC50: 67 nM
MAO-B, IC50: 29 nM
MAO-B-IN-19 
MAO-B, IC50: 0.67 μM
MAO-B-IN-29 
MAO-B
MAO-B-IN-15
hMAO-A, IC50: >100 μM
hMAO-B, IC50: 13.5 μM
Desoxypeganine hydrochloride
MAO-A, IC50: 2 μM
 
AChE/MAO-B-IN-4 
hMAO-B
Monoamine Oxidase B inhibitor 2
MAO-A, IC50: 1150 nM
MAO-B, IC50: 1.33 nM
(E)-CHBO4 
MAO-B, IC50: 0.023 μM
H3R antagonist 2 
MAO-B, IC50: 775 nM
AChE/BuChE/MAO-B-IN-2 
hMAO-B, IC50: 1.9 μM
Monoamine Oxidase B inhibitor 1
MAO-A, IC50: 810 nM
MAO-B, IC50: 0.02 nM
MAO-A/SERT-IN-1
MAO-A
 
SL-25.1188 
hMAO-B, Ki: 2.9 nM
rMAO-B, Ki: 8.5 nM
Lazabemide hydrochloride 
MAO-B, IC50: 0.4 nM
AChE/MAO-IN-2
MAO-A, IC50: 0.1116 μM
MAO-B, IC50: 0.0412 μM
hAChE-IN-3 
MAO-B, IC50: 5.15 μM
MAO-B-IN-12 
MAO-B, IC50: 1.3 μM
COMT-IN-1
MAO-A, IC50: 95.58 μM
MAO-B, IC50: 58.82 μM
Methyl piperate 
MAO-B
Monoamine oxidase/Aromatase-IN-1 
MAO-B, IC50: 39 nM
Eckol
hMAO-A, IC50: 7.20 μM
hMAO-B, IC50: 83.44 μM
Dual AChE-MAO B-IN-4 
MAO-B, IC50: 15 nM
LSD1-IN-16
MAO-A, IC50: 0.024  ±   μM
MAO-B, IC50: 0.366  ±  μM
PSB-1434 
MAO-B, IC50: 1.59 nM
98.05%
BChE/MAO-B-IN-1 
MAO-B, IC50: 20 nM
AChE-IN-82
hMAO-A, IC50: 14.52 μM
hMAO-B, IC50: 0.024 μM
5-HT6R/MAO-B modulator 1 
MAO-B
MAO-B-IN-42 
MAO-B, IC50: 0.184 μM
MAO A/HSP90-IN-1
MAO-A, IC50: 1.77 μM
 
Norharmine
MAO-A
 
Fabomotizole
MAO-A
 99.96%
Tedizolid phosphate sodium
MAO-A
MAO-B
Harmane hydrochloride
hMAO-A, IC50: 0.5 μM
MAO-B, IC50: 5 μM
PSB-1410 
hMAO-B, IC50: 0.23 nM
rMAO-B, IC50: 1.01 nM
99.22%
SZV-558 
rMAO-B, IC50: 50 nM
hMAO-B, IC50: 60 nM
Brofaromine hydrochloride
MAO-A
 
2-APB hydrochloride
MAO-A
 
Acacetin 7-O-(6-O-malonylglucoside)
MAO-A, IC50: 2.34 μM
MAO-B, IC50: 1.87 μM
(-)-2-Phenylpropylamine
MAO-A, Ki: 584 μM
MAO-B, Ki: 156 μM
6,7-Dimethylisatin
MAO-A, IC50: 20.3 μM
MAO-B, IC50: 6.74 μM