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Merck

C1909

Acide citrique monohydrate

ACS reagent grade, ≥99.0%, powder

Synonyme(s) :

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

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A propos de cet article

Formule linéaire :
HOC(COOH)(CH2COOH)2 · H2O
Numéro CAS:
Poids moléculaire :
210.14
NACRES:
NA.21
PubChem Substance ID:
UNSPSC Code:
12352100
EC Number:
201-069-1
MDL number:
Beilstein/REAXYS Number:
4018641
Assay:
≥99.0%
Form:
powder
Grade:
ACS reagent
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Nom du produit

Acide citrique monohydrate, ACS reagent, ≥99.0%

InChI key

YASYEJJMZJALEJ-UHFFFAOYSA-N

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

SMILES string

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

grade

ACS reagent

assay

≥99.0%

form

powder

impurities

Substances carbonizable by hot sulfuric acid, passes test
≤0.005% Insoluble matter

ign. residue

≤0.02%

Quality Level

pH

(1.8 at 50 g/l at 20 °C)

pKa 

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

solubility

H2O: soluble 54 % (w/w) at 10 °C (Citric acid in water)
H2O: 59.2 % (w/w) at 20 °C (Citric acid in water)
H2O: 84.0 % (w/w) at 100 °C (Citric acid in water)

anion traces

chloride (Cl-): ≤0.001%
oxalate (C2O42-): passes test (limit about 0.05%)
phosphate (PO43-): ≤0.001%
sulfate (SO42-): ≤0.002%

cation traces

Fe: ≤3 ppm
Pb: ≤2 ppm

functional group

carboxylic acid

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Application

Citric acid monohydrate was used in the preparation of citric acid solution employed in the acetone method of 68Ga pre-purification and radiolabeling technique.
It may be used:
  • As release-modifying agent to improve the release of diltiazem hydrochloride from melt extruded Eudragit RS PO tablets.
  • To prepare citrate buffer for use in the preparation of platelets for intravital microscopy.
  • To prepare Tris-citrate buffer employed for the electrophoresis of bacterial enzymes.

General description

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. It can be produced by crystallization from mother liquor of citric acid solution at 20-25°C during citric acid synthesis. An investigation of its crystal growth kinetics indicates that growth is linearly dependent on size.

Citric acid monohydrate is an organic weak acid used as a natural preservative in food and beverage products.

pictograms

Exclamation mark

signalword

Warning

hcodes

Hazard Classifications

Eye Irrit. 2 - STOT SE 3

target_organs

Respiratory system

Classe de stockage

11 - Combustible Solids

wgk

WGK 1

flash_point_f

345.0 °F - closed cup

flash_point_c

173.9 °C - closed cup

ppe

dust mask type N95 (US), Eyeshields, Gloves


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Consulter la Bibliothèque de documents

Eco-friendly rice husk pre-treatment for preparing biogenic silica: Gluconic acid and citric acid comparative study
Setiawan WK and Chiang KY
Chemosphere, 179, 130541-130541 (2021)
Size dependency of citric acid monohydrate growth kinetics.
Bravi M and Mazzarotta B.
Chemical Engineering Journal, 70(3), 203-207 (1998)
Michael K Schultz et al.
Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine, 76, 46-54 (2012-10-03)
A new NaCl based method for preparation of gallium-68 labeled radiopharmaceuticals has been adapted for use with an automated gallium-68 generator system. The method was evaluated based on 56 preparations of [(68)Ga]DOTATOC and compared to a similar acetone-based approach. Advantages
Methods of multilocus enzyme electrophoresis for bacterial population genetics and systematics.
R K Selander et al.
Applied and environmental microbiology, 51(5), 873-884 (1986-05-01)
Sandra U Schilling et al.
International journal of pharmaceutics, 361(1-2), 158-168 (2008-06-28)
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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