Citric acid

SIGMA/27487 - BioUltra, anhydrous, ≥99.5% (T)

CAS Number: 77-92-9
Empirical Formula (Hill Notation): C₆H₈O₇
Molecular Weight: 192.12
EC Number: 201-069-1
MDL Number: MFCD00011669
Linear Formula: HOC(COOH)(CH₂COOH)₂
Product Type: Chemical

Catalog Number	PKG Qty.	Price


45-27487-50G-F	50 g	$38.50 1/EA	Add To Favorites
45-27487-250G-F	250 g	$49.10 1/EA	Add To Favorites
45-27487-1KG-F	1 kg	$148.00 1/EA	Add To Favorites

Properties
Descriptions
Safety Info.
Basic Data

λ_max	260 nm (Amax: ≤0.20)
	280 nm (Amax: ≤0.10)
λ	1 M in H₂O
anion traces	chloride (Cl^-): ≤5 mg/kg
	oxalate (C₂O₄^2-): ≤0.05%
	phosphate (PO₄^3-): ≤5 mg/kg
	sulfate (SO₄^2-): ≤20 mg/kg
	tartrate (C₄H₄O₆^2-): ≤0.20%
assay	≥99.5% (T)
cation traces	Al: ≤5 mg/kg
	As: ≤0.1 mg/kg
	Ba: ≤5 mg/kg
	Bi: ≤5 mg/kg
	Ca: ≤10 mg/kg
	Cd: ≤5 mg/kg
	Co: ≤5 mg/kg
	Cr: ≤5 mg/kg
	Cu: ≤5 mg/kg
	Fe: ≤5 mg/kg
	K: ≤50 mg/kg
	Li: ≤5 mg/kg
	Mg: ≤5 mg/kg
	Mn: ≤5 mg/kg
	Mo: ≤5 mg/kg
	Na: ≤50 mg/kg
	Ni: ≤5 mg/kg
	Pb: ≤5 mg/kg
	Sr: ≤5 mg/kg
	Zn: ≤5 mg/kg
expl. lim.	8 %, 65 °F
form	powder or crystals
ign. residue	≤0.05% (as SO₄)
impurities	insoluble matter, passes filter test
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
loss	≤0.5% loss on drying, 110 °C
mp	153-159 °C (lit.)
pH	1.0-2.0 (25 °C, 1 M in H₂O)
pKa	(1) 3.13, (2) 4.76, (3) 6.4
product line	BioUltra
Quality Level	200
SMILES string	OC(=O)CC(O)(CC(O)=O)C(O)=O
solubility	H₂O: 1 M at 20 °C, clear, colorless
technique(s)	cell culture \| hybridoma: suitable
UV absorption	λ: 260 nm A_max: 0.20
	λ: 280 nm A_max: 0.10

Application:

Enhancing soil microbiomes: Citric acid has been applied to modify soil bacterial communities in saline mudflats, demonstrating its utility in environmental biotechnology for sustainable ecosystem management (Liu et al., 2024 ).

Biodegradable packaging in food industry: In food chemistry, citric acid is used in conjunction with polyvinyl alcohol for developing antimicrobial packaging, highlighting its potential in food safety and preservation (Xu et al., 2024 ).

Nanomaterial synthesis for engineering applications: Citric acid serves as a key component in the eco-friendly synthesis of hybrid nanomaterials for supercapacitors, underpinning its role in advancing materials science and engineering (Teixeira et al., 2024 ).

Environmental science and pollution control: Research utilizes citric acid to study the co-transport of pharmaceuticals and nanoparticles in environmental systems, aiding in the understanding of contaminant dynamics and mitigation strategies (Cui et al., 2024 ).

Food science and technology: Citric acid is employed in the formulation of vegan gummies, indicating its versatility in food product development and its impact on textural properties (Rawat et al., 2024 ).

General description:

Citric acid is a buffer component for triple-column amino acid analysis. It is an optimal buffer for dissociation of radioiodinated antibodies from viable murine tumor cells.

Symbol	GHS07
Signal word	Warning
Hazard statements	H319
Precautionary statements	P264 - P280 - P305 + P351 + P338 - P337 + P313
Hazard Codes	Xi
Risk Statements	36
Safety Statements	26
RIDADR	NONH for all modes of transport
WGK Germany	WGK 1
Flash Point(F)	Not applicable
Flash Point(C)	Not applicable

Purity	≥99.5% (T)
mp	153-159 °C (lit.)
UNSPSC	12161700

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