Color

Yellow crystalline powder

Complies

Flavor & Odor

Characteristic, tasteless

Complies

Particle size

100% pass through 80 mesh sieve

Complies

Identification

USP

Complies

Loss on drying

≤0.1%

0.03%

Residue on ignition

≤0.1%

0.04%

Melting point

60.0~62.0

60.4~61.5

Heavy metals

<10ppm

Complies

Lead

<5ppm

Complies

Arsenic

<2ppm

Complies

Alpha-Lipoic Acid

99.0-101.0%

99.82%

Acetic ether

≤250ppm

70ppm

Cyclohexane

≤1000ppm

620ppm

Acetone

≤500ppm

Non Detectable

6,8-Epitrithiooctanoic acid

≤0.1%usp

0.09%

Single unknown impurities

≤0.1%usp

0.08%

Total impurities

≤0.5%usp

0.29%