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L-Histidine Amino Acid CAS NO. 71-00-1

STANDARD： USP39
SHELF LIFE： 2YEARS
FREE SAMPLE: AVAILABLE

L-Histidine is an amino acid. And it is one of essential amino acids, which is important for human.

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Items	Specifications	Results
Appearance	White crystals or crystalline powder	White crystalline powder
Assay	98.5%~101.5%	99.70%
pH	7.0~8.5	7.8
Specific Rotation[α]D²⁵	12.6°~14.0°	12.8°
Loss on Drying	≤0.2%	0.14%
Residue on Ignition	≤0.4%	0.03%
Heavy metal	≤15ppm	<15ppm
Chloride	≤0.05%	<0.05%
Sulfate	≤0.03%	<0.03%
Iron	≤30ppm	<30ppm
Chromatographic purity	conforms	conforms
Organic volatile impurities	conforms	conforms

Items	Specifications	Results
Appearance	White crystals or crystalline powder	White crystalline powder
Assay	≥99%	99.65%
pH	6.5~7.5	7.34
Clarity of Solution	Clear	Clear
Melting Point	197℃~204℃	199.0℃-200.℃
Loss on Drying	≤0.5%	0.39%
Residue on Ignition	≤0.1%	0.03%
Heavy metal	≤10ppm	<10ppm
Arsenic	≤1ppm	<1ppm
Chloride	≤40ppm	<40ppm
Sulfate	≤50ppm	<50ppm
Ca2＋	No opalescence	Conforms
Mercury	≤0.1ppm	<0.1ppm
Lead	≤3ppm	<3ppm
Cadmium	≤1ppm	<1ppm
Total Plate Count	≤1000cfu/g	60cfu/g
Total Yeast & Mold	≤100cfu/g	18cfu/g
E.Coli	Negative	Conforms
Salmonella	Negative	Conforms

Items	Specifications	Results
Appearance	White crystals or crystalline powder	White crystalline powder
Assay	98.5%~101.5%	99.70%
pH	7.0~8.5	7.8
Specific Rotation[α]D²⁵	12.6°~14.0°	12.8°
Loss on Drying	≤0.2%	0.14%
Residue on Ignition	≤0.4%	0.03%
Heavy metal	≤15ppm	<15ppm
Chloride	≤0.05%	<0.05%
Sulfate	≤0.03%	<0.03%
Iron	≤30ppm	<30ppm
Chromatographic purity	conforms	conforms
Organic volatile impurities	conforms	conforms

Items	Specifications	Results
Appearance	White crystals or crystalline powder	White crystalline powder
Assay	≥99%	99.65%
pH	6.5~7.5	7.34
Clarity of Solution	Clear	Clear
Melting Point	197℃~204℃	199.0℃-200.℃
Loss on Drying	≤0.5%	0.39%
Residue on Ignition	≤0.1%	0.03%
Heavy metal	≤10ppm	<10ppm
Arsenic	≤1ppm	<1ppm
Chloride	≤40ppm	<40ppm
Sulfate	≤50ppm	<50ppm
Ca2＋	No opalescence	Conforms
Mercury	≤0.1ppm	<0.1ppm
Lead	≤3ppm	<3ppm
Cadmium	≤1ppm	<1ppm
Total Plate Count	≤1000cfu/g	60cfu/g
Total Yeast & Mold	≤100cfu/g	18cfu/g
E.Coli	Negative	Conforms
Salmonella	Negative	Conforms