The HPLC method used for the purity assay would separate maleic acid from fumaric acid. Fumaric acid would be resolved and would elute within the run time, with a significant difference in retention time between the two acids. Although fumaric acid content is not specifically tested or reported during the release of this product, the purity stated as ≥99% is the chromatographic purity determined by % peak area. This would indicate that total impurities must be less than or equal to 1%.
M0375
Maleic acid
ReagentPlus®, ≥99% (HPLC)
Synonym(s):
cis-Butenedioic acid, Toxilic acid
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About This Item
Linear Formula:
HO2CCH=CHCO2H
CAS Number:
Molecular Weight:
116.07
UNSPSC Code:
12352100
NACRES:
NA.21
PubChem Substance ID:
EC Number:
203-742-5
Beilstein/REAXYS Number:
605762
MDL number:
Assay:
≥99% (HPLC)
Concentration:
≤100%
Form:
powder
Grade:
reagent grade
Pricing and availability is not currently available.
grade
reagent grade
Quality Segment
vapor density
4.0 (at °C, vs air)
vapor pressure
≤0.1 at hPa ( 20 °C)
product line
ReagentPlus®
assay
≥99% (HPLC)
form
powder
concentration
≤100%
impurities
≤2.0% water
ign. residue
≤0.1%
pH
1,3 -at 100 g/l (at 20 °C)
pKa (25 °C)
(1) 1.97, (2) 6.24
bp
157.8 °C/316.0 °F -at 997 hPa
mp
130-135 °C (lit.)
solubility
water: soluble 478,8 g/L at at 20 °C (Completely )
density
1.59 g/mL at 25 °C (lit.)
functional group
carboxylic acid
SMILES string
OC(=O)\C=C/C(O)=O
InChI
1S/C4H4O4/c5-3(6)1-2-4(7)8/h1-2H,(H,5,6)(H,7,8)/b2-1-
InChI key
VZCYOOQTPOCHFL-UPHRSURJSA-N
General description
Maleic acid (MA) is a dicarboxylic acid that undergoes esterification with ethanol in the presence of cation-exchange resin catalysts to form diethyl maleate. Its crystalline structure has been analyzed. Reaction kinetics and mechanism of the isomerization of maleic acid to fumaric acid in the presence of ceric and bromide ions has been investigated. The reaction mechanism and reactivity ratios for the radical copolymerization of maleic acid with styrene have been determined.
Application
Analysis Note
Repurified
Legal Information
ReagentPlus is a registered trademark of Merck KGaA, Darmstadt, Germany
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This Item | |||
|---|---|---|---|
| concentration ≤100% | concentration - | concentration - | concentration - |
| grade reagent grade | grade - | grade electronic grade | grade - |
| assay ≥99% (HPLC) | assay ≥99.5% (HPLC), ≥99.5% anhydrous basis (HPLC) | assay ≥99.97% trace metals basis | assay 99.0-101.0% substance (anhydrous) basis |
| Quality Level 200 | Quality Level 100 | Quality Level 100 | Quality Level 500 |
| form powder | form powder | form powder | form solid |
| pH 1,3 -at 100 g/l (at 20 °C) | pH - | pH - | pH 1.3 (20 °C, 100 g/L in H2O) |
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signalword
Danger
target_organs
Respiratory system
Storage Class
8A - Combustible corrosive hazardous materials
Hazard Classifications
Acute Tox. 4 Dermal - Acute Tox. 4 Oral - Eye Dam. 1 - Skin Corr. 1B - Skin Sens. 1 - STOT SE 3
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Is the HPLC method used for Maleic assay separating the maleic acid from the fumaric acid peak? In the CoA that I have on batch 416071 Purity is NLT99%. Does that mean that fumaric acid must be less than 1%? Other suppliers specify fumaric acid % by HPLC.
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How can I determine the shelf life / expiration / retest date of this product?
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If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdfHelpful?
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How is shipping temperature determined? And how is it related to the product storage temperature?
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Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
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