Cysteine hydrochloride

Cystamine dihydrochloride, S,5-(L,L)-Cystathionine, Cysteamine, Cysteamine hydrochloride, ( )-Cysteic acid, S-Cysteic acid (H2O), L-Cysteine hydrochloride (H2O), ( )-Cysteine hydrochloride and L-Cystine, Cytidine, see entries in Chapter 6. 

To a suspension of 35.2 grams (0.2 mol) of L-cysteine hydrochloride monohydrate stirred in a reaction vessel containing 87 ml of 91% aqueous tetrahydrofuran under a nitrogen... 

C3H7NO2S 52-90-4) see Carbocisteine Cilastatin Eptifibatide Letosteine Timonacic L-cysteine hydrochloride monohydrate... 

The submitters purchased L-cysteine hydrochloride monohydrate from Schwartz/Mann Division, Becton, Dickinson, and Company, Mountain View Avenue, Orangeburg, New York 10962. The checkers used material supplied by Aldrich Chemical Company, Inc. 

The balloon was removed briefly while aliquots were taken. The flask was flushed again with nitrogen and the balloon was then replaced. Thin-layer chromatographic analyses were carried out on glass plates coated with silica gel G which were purchased from Analtech, Newark, Delaware. With a 10 2 3 (v/v/v) solution of 1-butanol, acetic acid, and water as developing solvent, the Rf values for the product and L-cysteine hydrochloride are 0.19 and 0.25, respectively. 

The present procedure provides a convenient method for preparing S-acetamidomethyl-L-cysteine hydrochloride." The zwitterionic form may be obtained readily from the hydrochloride by... 

S-Acetamidomethyl-L-cysteine hydrochloride Alanine, 3-[(acetamidomethyl)thio]-, monohydrochloride, i- (8) L-Cysteine, S-[(acetylamino)methyl]-, monohydrochloride (9) (28798-28-9) L-Cysteine hydrochloride, monohydrate (8, 9) (7048-04-6) Mercury(II) acetate Acetic acid, mercury (2) salt (8,9) (1600-27-7)... 

Neutralizing agent Dilution orTween 80 Cysteine hydrochloride... 

Walsh et al. (2000) have reported the reduction of L-cystine hydrochloride to L-cysteine hydrochloride and have covered laboratory kinetics to process modelling for several m cells. 

The selection of an appropriate antioxidant depends on factors such as stability, toxicity, efficiency, odor, taste, compatibility with other ingredients, and distribution phenomena between the two phases. Antioxidants that give protection primarily in the aqueous phase include sodium metabisulfite, ascorbic acid, thioglycerol, and cysteine hydrochloride. Oil-soluble antioxidants include lecithin, propyl gal-late, ascorbyl palmitate, and butylated hydroxytoluene. Vitamin E has also been used, but its virtue as a natural antioxidant has been the subject of some controversy. 

L-Cysteine hydrochloride E920 All flour used in the manufacture of biscuits, except wholemeal or flour to which E220 sulfur dioxide or E223 sodium metabisullite has been added 300... 

L-Cysteine hydrochloride E920 Other flour except wholemeal. All bread, except wholemeal 75... 

L-Cysteine is normally added as L-cysteine hydrochloride or L-cysteine hydrochloride monohydrate. When the ADD process was in use it was incorporated in a compound improver. If L-cysteine is used as a pastry relaxant it is supplied mixed with either soy flour or an inactivated wheat flour. This of course aids dispersion and the measurement of very small quantities. 

The flour improver would contain sufficient L-cysteine hydrochloride to give 35 mg kg-1 of flour (equivalent to around 27 mg kg-1 of L-cysteine) with sufficient potassium bromate to give 25 mg kg-1 of flour and sufficient ascorbic acid to give 50 mg kg-1 of flour. The above assumes a flour of 12% protein that has had added to it up to 20 mg kg-1 potassium bromate. Alternatively, with an untreated flour all the potassium bromate would be in the improver. 

Various additives are used to act as dough relaxants. They are L-cysteine hydrochloride, sulfur dioxide, possibly in the form of sodium metabisulfite, and acids such as acetic acid in vinegar. 

Table 10. Comparison of filterpress reactor sizes for the electrosynthesis of L-cysteine hydrochloride. Catholyte = 2 M HC1 at 25°C j = 2 kAm 2 v = 0.35 ms 1 Pb cathode in presence of turbulence promotor DEM cell [13, p. 327J...

L-Cysteine hydrochloride monohydrate [7048-09-6] (115) 1000C I(1)592A, N(1)499B HA2275000, USP... 

Figure 10. VCD and absorption spectra in the CH stretching region of (a) L-cysteine 0.83 M in DjO, path length 200 nM, and (b) L-cysteine hydrochloride, 0.8 M in D2O, path length 200 iiM. (Reproduced with permission from ref. 89. Copyright 1985 American Chemical Society.)...

Acetylcysteine Acetylcysteine, A-acetyl-L-cysteine (23.2.4), is synthesized by reacting L-cysteine hydrochloride with acetic anhydride in the presence of sodium acetate [11-13],... 

Aminothiophenol (236t) reacts quantitatively to give the five-membered compound 350 [5] (Scheme 56). On the other hand, d- and rac-penicillamine hydrochloride (43-HCl) (but not the free bases) give the d- and rac-thiazolidine hydrochloride hydrates (351) with 100% yield if acetone (316) vapors are applied to them. The same is true for L-cysteine hydrochloride (352-HCl) giving the thiazolidine L-353-HC1-H20 [5]. 

Various crystalline states of cysteine, cysteine hydrochloride, and cysteine hydrochloride hydrate have been tested for solid-state reactivity. Thus, (R)-352 and (i )-352-HCl-H20 were also reactive in the solid-state. This was verified by quantitative solid-solid reactions with paraformaldehyde (354) in stoichiometric ball-milling experiments at room temperature giving 100% yield of R)-355 [12] or (J )-355-HCl [10] after drying. 

L-Cysteine hydrochloride (H2O) [52-89-1] M 157.6, m 175-178° (dec), [0] +6.53° (5M HCl). Likely impurities are cystine and tyrosine. Crystd from MeOH by adding ethyl ether, or from hot 20% HCl. Dried under vacuum over P2O5. Hygroscopic. 

Cysteine hydrochloride [10318-18-0] M 157.6. Crystd from hot 20% HCl dried under vacuum over P2O5. 

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