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662534

Sigma-Aldrich

4-Mercaptobenzoic acid

technical grade, 90%

Synonym(s):

4-Carboxybenzenethiol, 4-Carboxythiophenol, 4-Mercaptobenzoic acid, p-Carboxybenzenethiol, p-Mercaptobenzoic acid

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About This Item

Linear Formula:
HSC6H4CO2H
CAS Number:
1074-36-8
Molecular Weight:
154.19
MDL number:
MFCD00016617
UNSPSC Code:
12352100
PubChem Substance ID:
24884591
NACRES:
NA.22

grade

technical grade

Assay

90%

form

solid

mp

215-224 °C (lit.)

SMILES string

OC(=O)c1ccc(S)cc1

InChI

1S/C7H6O2S/c8-7(9)5-1-3-6(10)4-2-5/h1-4,10H,(H,8,9)

InChI key

LMJXSOYPAOSIPZ-UHFFFAOYSA-N

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General description

4-Mercaptobenzoic acid (4-MBA), also known as 4-Carboxythiophenol or p-Mercaptobenzoic acid, is an aromatic compound used in organic synthesis. 4-MBA promotes the formation of disulfide bonds through its reactive thiol (-SH) group. The sulfur atom in the thiol group is highly nucleophilic, allowing it to attack electrophiles.  facilitates the formation of diverse thiol-containing compounds.  Additionally, 4-MBA serves as a ligand to form coordination complexes and is utilized for surface functionalization, particularly in creating self-assembled monolayers (SAMs) on metal surfaces.

Application

  • SERS substrate for food adulteration detection: 4-Mercaptobenzoic acid was employed in the layer-by-layer biopolymer assembly for the in situ fabrication of AuNP plasmonic paper, serving as a SERS substrate useful in detecting food adulteration (Viriyakitpattana et al., 2024).
  • Development of magneto-plasmonic nanoparticles: Research highlighted the use of 4-Mercaptobenzoic acid in the multiwavelength SERS of magneto-plasmonic nanoparticles, obtained through combined laser ablation and solvothermal methods, showing versatility in nanoparticle synthesis (Talaikis et al., 2023).

Pictograms

Exclamation mark
GHS07

Signal Word

Warning

Hazard Statements

H315,H319,H335

Hazard Classifications

Eye Irrit. 2 - Skin Irrit. 2 - STOT SE 3

Target Organs

Respiratory system

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Regulatory Listings

Regulatory Listings are mainly provided for chemical products. Only limited information can be provided here for non-chemical products. No entry means none of the components are listed. It is the user’s obligation to ensure the safe and legal use of the product.

JAN Code

662534-5G:
662534-VAR:
662534-25G:
662534-BULK:

Certificates of Analysis (COA)

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Molly K Gregas et al.
Applied spectroscopy, 64(8), 858-866 (2010-08-20)
We describe the development and application of a co-functionalized nanoprobe and biodelivery platform combining a nuclear targeting peptide (NTP) for improved cellular uptake and intracellular targeting with p-mercaptobenzoic acid (pMBA) as a surface-enhanced Raman scattering (SERS) reporter for tracking and
Wen-Tsen Chen et al.
Journal of the American Society for Mass Spectrometry, 21(5), 864-867 (2010-02-23)
We have developed a new internal standard method for the determination of the concentration of captopril (CAP) through surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS) using gold nanoparticles (Au NPs). This approach provided linearity for CAP over the concentration range 2.5-25
Aleksandra Jaworska et al.
The Analyst, 140(7), 2321-2329 (2014-12-09)
The intracellular pH plays an important role in various cellular processes. In this work, we describe a method for monitoring of the intracellular pH in endothelial cells by using surface enhanced Raman spectroscopy (SERS) and 4-mercaptobenzoic acid (MBA) anchored to
Fenglin Wang et al.
Analytical chemistry, 84(18), 8013-8019 (2012-08-14)
Sensors based upon surface-enhanced Raman spectroscopy (SERS) are attractive because they have narrow, vibrationally specific spectral peaks that can be excited using red and near-infrared light which avoids photobleaching, penetrates tissue, and reduces autofluorescence. Several groups have fabricated pH nanosensors
Garima Gupta et al.
Biosensors & bioelectronics, 36(1), 95-102 (2012-04-27)
Surface plasmon resonance (SPR) immunosensor using 4-mercaptobenzoic acid (4-MBA) modified gold SPR chip was developed first time for the detection of flagellin specific antibodies of Salmonella typhi (S. typhi). Flagellin protein of S. typhi was prepared by recombinant DNA technology.
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