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923-32-0 Usage


DL-Cystine is a nonessential amino acid that serves as a nutrient and dietary supplement. It is very slightly soluble in water and in alcohol. DL-Cystine enhances the biological quality of the total protein in foods containing naturally occurring intact protein.


Used in Food Industry:
DL-Cystine is used as a nutrient and dietary supplement for improving the biological quality of the total protein in foods containing naturally occurring intact protein.
Used in Cosmetics and Personal Care Industry:
DL-Cystine is used in the preparation of sulfur-containing dimeric and monomeric surfactants, which are utilized in the formulation of various cosmetic and personal care products for their cleansing and foaming properties.

Synthesis Reference(s)

Tetrahedron Letters, 31, p. 5007, 1990 DOI: 10.1016/S0040-4039(00)97790-6

Check Digit Verification of cas no

The CAS Registry Mumber 923-32-0 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 9,2 and 3 respectively; the second part has 2 digits, 3 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 923-32:
70 % 10 = 0
So 923-32-0 is a valid CAS Registry Number.

923-32-0 Well-known Company Product Price

  • Brand
  • (Code)Product description
  • CAS number
  • Packaging
  • Price
  • Detail
  • TCI America

  • (C0518)  Cystine (DL- and meso- mixture)  >98.0%(HPLC)(T)

  • 923-32-0

  • 1g

  • 350.00CNY

  • Detail
  • TCI America

  • (C0518)  Cystine (DL- and meso- mixture)  >98.0%(HPLC)(T)

  • 923-32-0

  • 5g

  • 990.00CNY

  • Detail



According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 20, 2017

Revision Date: Aug 20, 2017


1.1 GHS Product identifier

Product name cystine

1.2 Other means of identification

Product number -
Other names meso-Cystine

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:923-32-0 SDS

923-32-0Relevant articles and documents

Electropolymerization of cobalt tetraamino-phthalocyanine at reduced graphene oxide for electrochemical determination of cysteine and hydrazine

Mani, Veerappan,Huang, Sheng-Tung,Devasenathipathy, Rajkumar,Yang, Thomas C. K.

, p. 38463 - 38469 (2016/05/19)

We describe a simple and elegant electropolymerization method to prepare highly stable tetraamino functionalized cobalt phthalocyanine (pTACoPc) at electrochemically reduced graphene oxide (RGO). The described method efficiently bridges the excellent physicochemical properties of RGO with the rich redox chemistry of TACoPc. Graphene oxide was electrochemically reduced to RGO at the electrode surface along with concominent electropolymerization of TACoPc. The electrochemical studies showed that RGO on pTACoP/GCE increased effective surface area, reduced charge transfer resistance and enhanced electrochemical signal. The RGO-pTACoPc film modified electrode exhibits excellent electrocatalytic ability to oxidize cysteine and hydrazine. To determine cysteine, the RGO-pTACoPc sensor displayed a linear concentration range of 50 nM to 2.0 μM, detection limit of 18.5 nM and sensitivity of 10.19 nA nM-1 cm-2. Besides, the sensor displayed a linear concentration range of 50 nM to 2.6 μM, detection limit of 10 nM and sensitivity of 1.62 nA nM-1 cm-2 to determine hydrazine. The electrocatalytic ability of RGO-pTACoPc shows better performance over other cobalt phthalocyanine derivatives. Furthermore, the described sensor exhibited long-term storage stability, good repeatability and reproducibility. The practical applicability of the sensor has been assessed in biological and water samples.

S-aroylthiooximes: A facile route to hydrogen sulfide releasing compounds with structure-dependent release kinetics

Foster, Jeffrey C.,Powell, Chadwick R.,Radzinski, Scott C.,Matson, John B.

supporting information, p. 1558 - 1561 (2014/04/17)

We report the facile preparation of a family of S-aroylthiooxime (SATO) H2S donors, which are synthesized via a click reaction analogous to oxime formation between S-aroylthiohydroxylamines (SATHAs) and aldehydes or ketones. Analysis of cysteine-triggered H2S release revealed structure-dependent release kinetics with half-lives from 8-82 min by substitution of the SATHA ring. The pseudo-first-order rate constants of substituted SATOs fit standard linear free energy relationships (p = 1.05), demonstrating a significant sensitivity to electronic effects.

Investigation of reactions postulated to occur during inhibition of ribonucleotide reductases by 2′-azido-2′-deoxynucleotides

Dang, Thao P.,Sobczak, Adam J.,Mebel, Alexander M.,Chatgilialoglu, Chryssostomos,Wnuk, Stanislaw F.

experimental part, p. 5655 - 5667 (2012/09/25)

Model 3′-azido-3′-deoxynucleosides with thiol or vicinal dithiol substituents at C2′ or C5′ were synthesized to study reactions postulated to occur during inhibition of ribonucleotide reductases by 2′-azido-2′-deoxynucleotides. Esterification of 5′-(tert-

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