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791725

Citric acid

anhydrous grade, ACS reagent grade, ≥99.5%, Redi-Dri™, free-flowing, crystals

Synonym(s):

2-Hydroxy-propane-1,2,3-tricarboxylic acid

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About This Item

Linear Formula:
HOC(COOH)(CH2COOH)2
CAS Number:
77-92-9
Molecular Weight:
192.12
NACRES:
NA.21
PubChem Substance ID:
329768287
UNSPSC Code:
12352100
EC Number:
201-069-1
MDL number:
MFCD00011669
Beilstein/REAXYS Number:
782061
eCl@ss:
39021801
Assay:
≥99.5%
Form:
crystals
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Product Name

Citric acid, anhydrous, free-flowing, Redi-Dri™, ACS reagent, ≥99.5%

Quality Level

200

grade

ACS reagent, anhydrous

product line

Redi-Dri™

assay

≥99.5%

form

crystals

quality

free-flowing

expl. lim.

8 %, 65 °F

impurities

Substances carbonizable by hot sulfuric acid, passes test

ign. residue

≤0.02%

pKa 

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

mp

153-159 °C (lit.)

anion traces

chloride (Cl-): ≤0.001%, oxalate (C2O42-): passes test (limit about 0.003%), phosphate (PO43-): ≤0.001%, sulfate (SO42-): ≤0.002%

cation traces

Fe: ≤3 ppm, Pb: ≤2 ppm

functional group

carboxylic acid, hydroxyl

SMILES string

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

InChI

1S/C6H8O7/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)

InChI key

KRKNYBCHXYNGOX-UHFFFAOYSA-N

General description

Citric acid also called 2-hydroxy-propane-1,2,3-tricarboxylic acid, is a component of the tricarboxylic acid cycle in all organisms. Industrial production of citric acid use fungal, yeast and citrus fruit as the major source. Aspergillus niger is majorly used for citric acid production by fermentation Manganese inhibits fermentative production of citric acid Oral supplementation of citric acid promotes tricarboxylic acid cycle and oxidative phosphorylation in mitochondria, attenuating physical fatigue.

Application

Citric acidhas been used as a component of citrate buffer and Fe-free sauton′s medium. It has been used in hybridization chain reaction buffer for preequilibration of coverslips for testes sections.

Legal Information

Redi-Dri™ is a trademark of Sigma-Aldrich Co. LLC
Redi-Dri is a trademark of Sigma-Aldrich Co. LLC

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pictograms

Exclamation mark
GHS07

signalword

Warning

hcodes

H319,H335

Hazard Classifications

Eye Irrit. 2 - STOT SE 3

target_organs

Respiratory system

Storage Class

11 - Combustible Solids

wgk

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

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Certificates of Analysis (COA)

Lot/Batch Number
0000462864
0000462864
0000502517
0000449541
0000449541

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Articles

Redi-Dri™ – The World of Free-flowing Hygroscopic Products

Redi-Dri™ prevents hygroscopic powders, such as inorganic salts, from absorbing moisture and forming clumps, leaving the salts free-flowing every time.

Biotechnological production of citric acid
Max B, et al.
Brazilian Journal of Microbiology, 41(4), 862-875 (2010)
Methylene blue exerts a neuroprotective effect against traumatic brain injury by promoting autophagy and inhibiting microglial activation
Zhao M, et al.
Molecular Medicine Reports, 13(1), 13-20 (2016)
Effects of citric acid and L-carnitine on physical fatigue
Sugino T, et al.
Journal of Clinical Biochemistry and Nutrition, 41(3), 224-230 (2007)
View All Related Papers

Global Trade Item Number

SKUGTIN
791725-100G04061832960579
791725-6X1KG04061832950037
791725-12KG04061832949925
791725-500G04061832949987
791725-2.5KG04061832949970
791725-1KG04061835555536