4-Nitrophenyl 4-guanidinobenzoate hydrochloride
4-Nitrophenyl 4-guanidinobenzoate hydrochloride (CAS: 19135-17-2) is a biochemical reagent with the molecular formula C14H12N4O4 · HCl and a molecular weight of 336.73 g/mol. It serves as a chromogenic substrate, primarily utilised in enzymatic assays. This compound is frequently employed in research settings for its ability to facilitate the detection and quantification of enzyme activity, particularly in studies involving plasma and blood proteins.
- IUPAC
- 4-Guanidinobenzoic acid 4-nitrophenylester hydrochloride,NPGB,pNPGB
- Synonyms
- 4-Guanidinobenzoic acid 4-nitrophenylester hydrochloride,NPGB,pNPGB

Enzyme Substrate
4-Nitrophenyl 4-guanidinobenzoate hydrochloride is employed as a chromogenic substrate in enzymatic assays. It allows for the spectrophotometric detection and quantification of enzyme activity by releasing 4-nitrophenol upon cleavage.
Biochemical Research
This compound is a valuable tool in biochemical research, particularly for studying enzymes involved in protein hydrolysis and blood coagulation pathways. It aids in understanding enzyme kinetics and inhibition.
Plasmin Assays
It is specifically used as a substrate for plasmin and other serine proteases, enabling the accurate assessment of their activity levels in biological samples.
| Molecular weight | 336.73 |
|---|---|
| Empirical formula | C14H12N4O4 · HCl |
| Assay | ≥98% (TLC) |
| Storage temperature | −20°C |

Hazard statements
- H318Causes serious eye damage
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36 |
| Safety statements (S) | 26 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 4-Nitrophenyl 4-guanidinobenzoate hydrochloride used for?
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4-Nitrophenyl 4-guanidinobenzoate hydrochloride is primarily used as a chromogenic substrate in biochemical research for the detection and quantification of enzyme activity, particularly for enzymes like plasmin.
What is the CAS number and molecular formula?
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The CAS number for 4-Nitrophenyl 4-guanidinobenzoate hydrochloride is 19135-17-2, and its molecular formula is C14H12N4O4 · HCl.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4-Nitrophenyl 4-guanidinobenzoate hydrochloride with an assay of ≥98% as determined by TLC. It is supplied for research and laboratory use and is not represented as USP, BP, or EP grade.
What are the safety and handling precautions?
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This compound can cause serious eye damage (H318). Handle with a dust mask (type N95 US), eyeshields, and gloves. Ensure good ventilation. In case of contact with eyes, rinse cautiously with water for several minutes and seek medical advice.
How is this chemical packed and shipped?
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Products are carefully packed according to international shipping regulations and can be exported globally by Tech Serve Solutions.
How can I request a sample or quote?
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Please contact our sales team directly via email or phone to request a sample or a quotation for 4-Nitrophenyl 4-guanidinobenzoate hydrochloride.
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