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240141 Aldrich

4-Hydroxybenzoic acid

ReagentPlus®, ≥99%



Related Categories Allium cepa (Onion), Allium sativum (Garlic), Armoracia rusticana (Horseradish), Aspalathus linearis (Rooibos tea), Building Blocks,
grade   ReagentPlus®
assay   ≥99%
mp   213-217 °C(lit.)
solubility   water: soluble 125 part(lit.)
  acetone: soluble(lit.)
  alcohol: freely soluble(lit.)
  carbon disulfide: insoluble(lit.)
  chloroform: slightly soluble(lit.)
  diethyl ether: soluble(lit.)


Frequently Asked Questions

Frequently Asked Questions are available for this Product.


50 g in poly bottle


4-Hydroxybenzoic acid was used in the synthesis of 4-hydroxybenzaldoxime, via one-pot chemoenzymatic method.

Legal Information

ReagentPlus is a registered trademark of Sigma-Aldrich Co. LLC

Price and Availability

Laboratory Gloves

All labs need water
Safety & Documentation

Safety Information

Signal word 
Hazard statements 
Precautionary statements 
Personal Protective Equipment 
NONH for all modes of transport
WGK Germany 


Certificate of Analysis

Certificate of Origin

Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis. These documents are located on the product detail page under Useful Links & Tools. Click on the following link to search for a Certificate of Analysis. Please click the following link to see the details on our Product Dating Information.
How do I get lot-specific information or a Certificate of Analysis?
A Certificate of Analysis is available by lot number and can be obtained through our Advanced Search Option: http://www.sigmaaldrich.com/catalog/AdvancedSearchPage.do
How do I find price and availability?
There are several ways to find pricing and availability for our products.  Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers. 
How can Product 240141, 4-Hydroxybenzoic acid, be dissolved?
According to the Merck Index, 4-Hydroxybenzoic acid is freely soluble in alcohol, and soluble in about 125 parts water.
What is the shelf life of Product 240141, 4-Hydroxybenzoic acid?
This information can be found on the product specification sheet for a related product (H20059): http://www.sigmaaldrich.com/catalog/search/SpecificationSheetPage/ALDRICH/H20059  For specific dates on the lot you received please refer to the certificate of analysis.
I see that Product 240141, 4-Hydroxybenzoic acid, is deleted. Which product do you offer in its place?
Our best offer item is Product No. H20059.
What is the Department of Transportation shipping information for this product?
Transportation information can be found in Section 14 of the product's (M)SDS. To access the shipping information for this material, use the link on the product detail page for the product, or search here. 
My question is not addressed here, how can I contact Technical Service for assistance?
Use the option to the right to "Ask a Question" by email of a Technical Service Scientist.
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Protocols & Articles


MSMLS Online Plate Map

Metabolite descriptors included with the software download upon purchase of the product include: Name, Parent CID, molecular formula, molecular weight, CAS, ChEBI, HMDB ID, PubChem Compound and Subst...
Keywords: Mass spectrometry, Metabolites

Peer-Reviewed Papers


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