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33114

Sigma-Aldrich

Ácido cítrico

puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., buffer substance, 99.5-102%

Sinônimo(s):

2-hydroxy-1,2,3-propanetricarboxylic acid monohydrate

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About This Item

Fórmula linear:
HOC(COOH)(CH2COOH)2 · H2O
Número CAS:
Peso molecular:
210.14
Beilstein:
4018641
Número CE:
Número MDL:
Código UNSPSC:
12352100
ID de substância PubChem:
NACRES:
NA.21

grau

ACS reagent
puriss. p.a.

Nível de qualidade

Agency

USP/NF
reag. ISO
reag. Ph. Eur.

Ensaio

99.5-100.5% (calc. on anhydrous substance)
99.5-102%

forma

solid

Impurezas

≤0.005% insolubles in water
≤2 ppm heavy metals (as Pb)
7.5-9.0% water (Karl Fischer)

resíduo de ignição

≤0.01% (as SO4)

pKa 

(1) 3.13, (2) 4.76, (3) 6.4

traços de ânion

chloride (Cl-): ≤5 mg/kg
oxalate (C2O42-): ≤50 ppm
phosphate (PO43-): ≤10 mg/kg
sulfate (SO42-): ≤20 ppm

traços de cátion

Ca: ≤50 mg/kg
Cu: ≤5 mg/kg
Fe: ≤3 ppm
Pb: ≤2 ppm
Zn: ≤5 mg/kg

adequação

complies for appearance of solution
complies for reaction against H2SO4

cadeia de caracteres SMILES

OC(CC(O)(C(O)=O)CC(O)=O)=O.O

InChI

1S/C6H8O7.H2O/c7-3(8)1-6(13,5(11)12)2-4(9)10;/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12);1H2

chave InChI

YASYEJJMZJALEJ-UHFFFAOYSA-N

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Descrição geral

Citric acid monohydrate is an organic acid. Its molar enthalpy of solution in water has been reported to be ΔsolHm (298.15K, m = 0.0203molkg-1) = (29061 ± 123)Jmol-1.

Aplicação

Citric acid monohydrate may be used in the preparation of tris-citrate buffer and Otto I isolation buffer used in bioprotocols. It may also be used to improve the release of diltiazem hydrochloride from melt extruded matrix tablets.

Pictogramas

Exclamation mark

Palavra indicadora

Warning

Frases de perigo

Classificações de perigo

Eye Irrit. 2 - STOT SE 3

Órgãos-alvo

Respiratory system

Código de classe de armazenamento

11 - Combustible Solids

Classe de risco de água (WGK)

WGK 1

Ponto de fulgor (°F)

345.0 °F - closed cup

Ponto de fulgor (°C)

173.9 °C - closed cup

Equipamento de proteção individual

dust mask type N95 (US), Eyeshields, Gloves


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Incomplete drug release and particle size-dependent dissolution performance can compromise the quality of controlled release matrix systems. The objective of the current study was to investigate the ability of citric acid monohydrate (CA MH) to enhance the release of diltiazem

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