L-Cysteine Hydrochloride Anhydrous CAS 52-89-1

L-Cysteine Hydrochloride Anhydrous is a white crystalline powder with a slight characteristic odour, easily soluble in water.As an amino acid derivative, it is widely used in the food industry (bread improver, antioxidant), the pharmaceutical field (expectorant, antidote) and cosmetics (perm, whitening ingredient), and its sulfhydryl group (-SH) has reducing properties.It needs to be kept sealed and protected from light to prevent oxidative failure.

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Model:
52-89-1
Brand:
Futurechemical
Code:
52-89-1

Product Description

L-Cysteine monohydrochloride Basic information
Product Name:	L-Cysteine monohydrochloride
CAS:	52-89-1
MF:	C3H8ClNO2S
MW:	157.62
EINECS:	200-157-7
Mol File:	52-89-1.mol
L-Cysteine monohydrochloride Chemical Properties
Melting point	180°C
alpha	5.5 º (c=8, 6 N HCL)
storage temp.	Inert atmosphere,Room Temperature
solubility	H2O: 1 M at 20 °C, clear, colorless
form	Solid
color	White to light brown
Odor	odorless
optical activity	[α]20/D +6.4±0.3°, c = 5% in 5 M HCl
biological source	synthetic
Water Solubility	SOLUBLE
Sensitive	Hygroscopic
Merck	142,781
BRN	3560277
Stability:	Stable, but light, moisture and air sensitive. Incompatible with strong oxidizing agents, some metals.
InChIKey	IFQSXNOEEPCSLW-DKWTVANSSA-N
LogP	0.235 (est)
CAS DataBase Reference	52-89-1(CAS DataBase Reference)
NIST Chemistry Reference	L-cysteine hydrochloride(52-89-1)
EPA Substance Registry System	L-Cysteine hydrochloride (52-89-1)

项目 Item			标准 Specifications	分	析 Test	结 Results	果
含量 (干基),% Assay ,%	min	≥	98.0～102.0	99.5
pH 值 pH value			1.5 ～ 2.0	1.7
比旋光度 Specific optical rotation[a] ²⁰° D			+ 5.6^o ~ +8.9^o	+ 6.5^o
透过率 %, (Transmittance)%,	≥	max	98.0	98.0
加热减量,% Loss on drying,%		≤ max	5.0	4.7
炽灼残渣,% ≤ Residue on ignition,% max			0.1	0.08
重金属 (以Pb 计),% ≤ Heavy metals (as Pb),% max			0.001	＜0.001
砷盐（以As 计）,% ≤ Arsenic (as As),% max			0.0001	＜0.0001
其它氨基酸 Other amino acids			色谱未检出	未检出
结论：本产品符合AJI92 版标准。 Conclusion: This product complies with AJI92standard.

L-Cysteine Hydrochloride Anhydrous C3H8ClNO2S CAS 52-89-1 Food nutritional supplement Flavor and fragrance antioxidant Dough leavening agent Hair dye and perm raw material

Quality Assurance

Full-Process Quality Control: From incoming raw material inspection to in-process monitoring and final outgoing checks, every batch is inspected at each production stage against strict acceptance standards.
Third-Party Certified & Tested: Our quality management system is certified to ISO 9001, and products are regularly tested by accredited laboratories (e.g. SGS, TÜV). Test reports are available on request.
100% Batch Traceability: Each batch carries a unique lot number that links raw material records, production parameters, and test results, enabling complete traceability from factory to final delivery.
Pre-Shipment Inspection: Every order passes a final pre-shipment inspection, with inspection photos and reports shared before dispatch.

FAQ From Customers

Q1: What is the minimum order quantity?

A: There is no quantity limit for the first sample or trial order. Just tell us the actual quantity you need.
Q2: How can I confirm that the quality meets the requirements?

A: Provide your specifications, and our technical team will check them or customize them for you; we can provide TDS, MSDS, and COA, and accept third-party testing.
Q3: How do you ensure stable quality?

A: We manufacture under an ISO 9001 quality system, test every batch before release, and retain samples for 24 months for traceability.
Q4: Do you provide samples?

A: Yes — Free samples are available; freight is at buyer's expense for express delivery.