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%.
Fortfahren mit
M0375
Maleinsäure
ReagentPlus®, ≥99% (HPLC)
Synonym(e):
cis-Butendisäure, Toxilsäure
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| Packungsgröße | SKU | Verfügbarkeit | Preis |
|---|---|---|---|
| 100 g | Warenkorb auf Verfügbarkeit prüfen | € 63,30 | |
| 500 g | Warenkorb auf Verfügbarkeit prüfen | € 69,60 | |
| 1 kg | Warenkorb auf Verfügbarkeit prüfen | € 78,40 | |
| 25 kg | Versand innerhalb von 5 Werktagen. (Bei Bestellungen außerhalb der USA rechnen Sie bitte zusätzlich 1-2 Wochen für die Lieferung ein) | € 1.320,00 |
Über diesen Artikel
Lineare Formel:
HO2CCH=CHCO2H
CAS-Nummer:
Molekulargewicht:
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
Technischer Dienst
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Unterstützung erhaltengrade
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
Maleinsäure (MA) ist eine Dicarbonsäure, die mit Ethanol in Gegenwart von Kationenaustauscherharz-Katalysatoren zu Diethylmaleat verestert wird. Seine kristalline Struktur wurde analysiert. Die Reaktionskinetik und der Mechanismus der Isomerisierung von Maleinsäure zu Fumarsäure in Gegenwart von Cer- und Bromid-Ionen wurde untersucht. Der Reaktionsmechanismus und die Reaktivitätsverhältnisse für die radikalische Copolymerisation von Maleinsäure mit Styrol wurden bestimmt.
Application
Maleinsäure wird zur Herstellung von Tris-Maleat-Puffer[1] und Natrium-Maleat-Puffer verwendet.[2] Sie wird auch zur Vorbehandlung von Pappel-Tracheidenzellwänden für die spektroskopische Analyse von Lignin eingesetzt.[3] Sie kann zur Synthese von superquellenden Acrylamid-/Maleinsäure-Hydrogelen verwendet werden.
Analysis Note
Repurified
Legal Information
ReagentPlus is a registered trademark of Merck KGaA, Darmstadt, Germany
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Dieser Artikel | |||
|---|---|---|---|
| grade reagent grade | grade - | grade electronic grade | grade - |
| concentration ≤100% | concentration - | concentration - | concentration - |
| 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
Lagerklasse
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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Artikel
Acid and base chart lists the strength of acids and bases (strongest to weakest) in order. Simple to use laboratory reference chart for scientists, researchers and lab technicians.
Verwandter Inhalt
Radical copolymerization of maleic acid with styrene.
Switala-Zeliazkow M.
Eur. Polymer J., 35(1), 83-88 (1999)
Esterification of maleic acid with ethanol over cation-exchange resin catalysts.
Yadav GD and Thathagar MB.
Reactive functional Polymers, 52(2), 99-110 (2002)
Swelling equilibria and dye adsorption studies of chemically crosslinked superabsorbent acrylamide/maleic acid hydrogels.
Karadag E, et al.
Eur. Polymer J., 38(11), 2133-2141 (2002)
Global Trade Item Number
| SKU | GTIN |
|---|---|
| M0375-100G | 04061835321070 |
| M0375-25KG | 04061835567744 |
| M0375-500G | 04061835321094 |
| M0375-1KG | 04061835321087 |
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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.
1 answer-
Helpful?
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How can I determine the shelf life / expiration / retest date of this product?
1 answer-
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?
1 answer-
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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