L-Apfelsure

Bezeichnung:L-Apfelsure

CAS-Nr97-67-6

Englisch Name:L-Malic acid

CBNumberCB0493594

SummenformelC4H6O5

Molgewicht134.09

MOL-Datei97-67-6.mol

Synonyma

L-Apfelsure

L-Apfelsure physikalisch-chemischer Eigenschaften

Schmelzpunkt	101-103 °C (lit.)
Siedepunkt	167.16°C (rough estimate)
alpha	-2 º (c=8.5, H2O)
Dichte	1.60
Dampfdruck	0Pa at 25℃
FEMA	2655 \| L-MALIC ACID
Brechungsindex	-6.5 ° (C=10, Acetone)
Flammpunkt	220 °C
storage temp.	Store below +30°C.
Löslichkeit	H₂O: 0.5 M at 20 °C, clear, colorless
Aggregatzustand	Powder
Wichte	1.595 (20/4℃)
Farbe	White
PH	2.2 (10g/l, H2O, 20℃)
pka	(1) 3.46, (2) 5.10(at 25℃)
Geruch (Odor)	odorless
Geruchsart	odorless
Optische Aktivität	[α]20/D 30±2°, c = 5.5% in pyridine
Wasserlöslichkeit	soluble
JECFA Number	619
Merck	14,5707
BRN	1723541
InChIKey	BJEPYKJPYRNKOW-REOHCLBHSA-N
LogP	-1.68
CAS Datenbank	97-67-6(CAS DataBase Reference)
NIST chemische Informationen	Butanedioic acid, hydroxy-, (s)-(97-67-6)
EPA chemische Informationen	Butanedioic acid, 2-hydroxy-, (2S)- (97-67-6)

Sicherheit

Kennzeichnung gefährlicher	Xi
R-Sätze:	36/37/38
S-Sätze:	26-36-37/39
WGK Germany	3
RTECS-Nr.	ON7175000
TSCA	Yes
HS Code	29181980

Gefahreninformationscode (GHS)

L-Malic acid Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
S37/39:Bei der Arbeit geeignete Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
Beschreibung
L-Malic acid is nearly odorless (sometimes a faint, acrid odor) with a tart, acidic taste. It is nonpungent. May be prepared by hydration of maleic acid; by fermentation from sugars.
Chemische Eigenschaften
L-Malic acid is nearly odorless (sometimes a faint, acrid odor). This compound has a tart, acidic, nonpungent taste.
Chemische Eigenschaften
clear colourless solution
Occurrence
Occurs in maple sap, apple, melon, papaya, beer, grape wine, cocoa, sake, kiwifruit and chicory root.
Verwenden
The naturally occuring isomer is the L-form which has been found in apples and many other fruits and plants. Selective α-amino protecting reagent for amino acid derivatives. Versatile synthon for the preparation of chiral compounds including κ-opioid rece
Verwenden
L-Malic acid is used as a food additive, Selective α-amino protecting reagent for amino acid derivatives. Versatile synthon for the preparation of chiral compounds including κ-opioid receptor agonists, 1α,25-dihydroxyvitamin D3 analogue, and phoslactomycin B.
Verwenden
Intermediate in chemical synthesis. Chelating and buffering agent. Flavoring agent, flavor enhancer and acidulant in foods.
synthetische
L-Malic acid can be prepared by hydration of maleic acid; by fermentation from sugar.
Definition
ChEBI: An optically active form of malic acid having (S)-configuration.
Allgemeine Beschreibung
L-Malic acid is an organic acid that is commonly found in wine. It plays an important role in wine microbiological stability.
Biochem/physiol Actions
L-Malic acid is a part of cellular metabolism. Its application is recognized in pharmaceutics. It is useful in the treatment of hepatic malfunctioning, effective against hyper-ammonemia. It is used as a part of amino acid infusion. L-Malic acid also serves as a nanomedicine in the treatment of brain neurological disorders. A TCA (Krebs cycle) intermediate and partner in the malic acid aspartate shuttle.
läuterung methode
Crystallise S-malic acid (charcoal) from ethyl acetate/pet ether (b 55-56o), keeping the temperature below 65o. Or dissolve it by refluxing in fifteen parts of anhydrous diethyl ether, decant, concentrate to one-third volume and crystallise it at 0o, repeatedly to constant melting point. [Beilstein 3 IV 1123.]

L-Malic acid Upstream-Materialien And Downstream Produkte

L-Apfelsure Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

97-67-6, L-Malic acid Verwandte Suche:

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