L-Valine CAS 72-18-4

L-valine, also known as 2-amino-3-methylbutanoic acid, has the chemical formula C5H11NO2. It is a white monoclinic crystal or crystalline powder; when recrystallized from an ethanol-water solution, it forms colorless plate-like or flaky crystals. It is odorless and has a characteristic bitter taste. The melting point is approximately 315°C. It is readily soluble in water (8.85g/100ml at 25°C), and its aqueous solution is acidic, with a pH of 5.5~7.0 for a 5% solution. It is almost insoluble in ethanol and diethyl ether. It is stable to heat, light, and air. Separation from leucine is difficult.

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Model:
72-18-4
Brand:
bosschemical
Code:
72-18-4

Product Description

L-Valine Basic information
Amino acids Content Analysis Chemical property Uses
Product Name:	L-Valine
CAS:	72-18-4
MF:	C5H11NO2
MW:	117.15
EINECS:	200-773-6
Mol File:	72-18-4.mol


L-Valine Chemical Properties
Melting point	295-300 °C (subl.) (lit.)
alpha	28 º (c=8, 6N HCl)
Boiling point	213.6±23.0 °C(Predicted)
density	1.23
bulk density	400kg/m3
refractive index	28 ° (C=8, HCl)
storage temp.	2-8°C
solubility	H2O: 25 mg/mL
form	powder
pka	2.29(at 25℃)
color	White
PH	5.5-6.5 (100g/l, H2O, 20℃)
Odor	odorless
Odor Type	odorless
biological source	non-animal source
Optical Rotation	[α]20/D +27.0±0.5°, c = 5% in 5 M HCl
Water Solubility	85 g/L (20 ºC)
λmax	λ: 260 nm Amax: 0.15
λmax	λ: 280 nm Amax: 0.1
Merck	149,909
BRN	1721136
Cosmetics Ingredients Functions	FRAGRANCE
	ANTISTATIC
	HAIR CONDITIONING
	SKIN CONDITIONING
InChIKey	KZSNJWFQEVHDMF-BYPYZUCNSA-N
LogP	0.29
CAS DataBase Reference	72-18-4(CAS DataBase Reference)
NIST Chemistry Reference	Valine(72-18-4)
EPA Substance Registry System	L-Valine (72-18-4)

检验项目 ITEM	检验标准 INSPECTION CRITERION	检验结果 RESULT
外观 Appearance	白色结晶或结晶性粉末 White crystals or crystalline powder	白色结晶性粉末 Conforms
鉴别 Identification	应符合规定 Meets the requirements	符合规定 Meets the requirements
比旋度 Specific rotation[α]D25	+26.6°~+28.8°	+28.0°
干燥失重 Loss on drying	≤0.3%	0.13%
炽灼残渣 Residue on ignition	≤0.1%	0.08%
氯化物 Chloride(Cl)	≤0.05%	＜0.05%
硫酸盐 Sulfate（SO4）	≤0.03%	＜0.03%
铁盐 Iron(Fe)	≤30ppm	＜30ppm
砷盐 Arsenic（As）	≤1.5ppm	＜1.5ppm
重金属 Heavy metals(Pb)	≤15ppm	＜15ppm
有机挥发物 Organic volatile impurities	应符合规定 Meets the requirements	符合规定 Meets the requirements
pH	5.5～7.0	6.1
含量 Assay	98.5%～101.5%	99.3%

L-Valine CAS 72-18-4 C5H11NO2

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Chemical detection methods

Spectroscopic Analysis Methods

Ultraviolet-Vis Spectrophotometry (UV-Vis)
Infrared Spectroscopy (IR/FTIR)
Atomic Absorption Spectroscopy (AAS)
X-ray Fluorescence Spectroscopy (XRF)
Nuclear Magnetic Resonance Spectroscopy (NMR)

Chromatographic Analysis

Gas Chromatography (GC)
High Performance Liquid Chromatography (HPLC)
Ion Chromatography (IC)
Thin Layer Chromatography (TLC)

Mass Spectrometry Analysis

GC-MS / LC-MS/MS: Qualitative and Quantitative Analysis
ICP-MS: Trace Metal Elements (ppb Level)
TOF-MS: Precise Molecular Weight Determination

Electrochemical analysis methods

Polypotentiometric methods
Conductivity methods
Polarographic methods / Voltammetric methods
Coulometric analysis

Thermal Analysis Methods

Thermogravimetric Analysis (TGA)
Differential Scanning Calorimetry (DSC)
Differential Thermal Analysis (DTA)

Classical wet chemical analysis

Titration analysis
Gravity analysis