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L-cysteine powder is an isomer of cysteine and can be converted from methionine. It also known as L-cysteine or cysteine, is an essential amino acid that plays a crucial role in various biological processes. Cysteine is white crystal or crystalline powder, soluble in water, slightly odorous, insoluble in ethanol, insoluble in ether and other organic solvents. Chemically, it has a sulfur-containing side chain, which makes it unique among other amino acids. This sulfur group is vital for the formation of disulfide bonds in proteins, contributing to their stability and structure. In the human body, L-cysteine is involved in the synthesis of glutathione, a powerful antioxidant that helps protect cells from oxidative stress and damage.
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Chemical Formula |
C3H7NO2S |
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Exact Mass |
121.02 |
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Molecular Weight |
121.15 |
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m/z |
121.02 (100.0%), 123.02 (4.5%), 122.02 (3.2%) |
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Elemental Analysis |
C, 29.74; H, 5.82; N, 11.56; O, 26.41; S, 26.46 |
L-cysteine powder, molecular weight 121.16, CAS number 52-90-4, is the only amino acid among the 20 basic amino acids that make up proteins that contains an active thiol group (- SH). This unique chemical structure endows it with excellent reducibility and multifunctionality, making it play an irreplaceable role in the food industry. From bread fermentation to fruit juice antioxidant, from meat color protection to dairy product nutritional enhancement, with its "versatile" characteristics, it has become one of the most widely used amino acid additives in modern food industry.
1.Bread and flour products: the "golden partner" of fermentation promotion and anti-aging
This is the most classic and largest application scenario in food, and can be called the "soul additive" of the bread industry.
1.1 Fermentation promotion and gluten improvement
Its thiol group (- SH) has strong reducibility and can undergo exchange reactions with disulfide bonds (- S-S -) in gluten proteins, forming a new disulfide bond network and changing the three-dimensional structure of gluten, making it softer and more elastic.
The direct effect of this effect is that the dough processing performance is significantly improved, the mold is smoother, the bread volume is increased, and the internal structure is more delicate and uniform.
The maturation of general dough requires fermentation for up to 3-5 hours, but the "quick method" using it as a reducing agent and potassium bromate as an oxidizing agent can significantly shorten the bread making time and fundamentally improve the working conditions. This technology has been recognized by legislation in countries such as the United States, Canada, and Japan, and has been officially included in food laws.
1.2. Prevent bread aging (preservation)
Bread will become hard and fall off during storage due to starch retrogradation, which is known as the "aging" phenomenon. By participating in the oxidation-reduction reaction of dough, the starch retrogradation process is effectively delayed, significantly extending the shelf life and shelf life of bread. Research has shown that when L-cysteine and ascorbic acid are synergistically used as reducing agents in a 1:1 molecular ratio, not only can the structure, taste, and aroma of bread be improved in a shorter period of time, but also better preservation effects can be achieved.
1.2. Nutritionally fortified bread
The nutritional bread fortifier mainly formulated with it can also supplement the nutrients such as phosphorus and calcium needed by the human body, reduce the amount of white sugar without increasing production costs, greatly enhance the nutritional value of the product while maintaining the same selling price, and promote the healthy development of the bread industry.
2. Juice and Beverages: The 'Color Guardian' for Antioxidants and Anti Browning
Natural fruit juice is rich in vitamin C (ascorbic acid), but vitamin C is easily oxidized by oxygen in the air, causing the juice to turn brown and produce harmful substances, seriously affecting product quality and consumer experience. It is the 'weapon' that solves this pain point.
2.1. Prevent vitamin C oxidation and browning
As a potent reducing agent, it can react with the oxidation products of vitamin C when added to fruit juice, preventing further oxidation of vitamin C and thus protecting its stability.
Preventing fruit juice browning, and maintaining its natural color and nutritional value. This function is particularly important in natural fruit juices and soft drinks.
2.2. Extend shelf life
By inhibiting oxidation and non enzymatic browning reactions, L-cysteine can significantly prolong the shelf life of natural fruit juices and soft drinks. L-cysteine additives are often added to natural fruit juices and other soft drinks abroad, which has become an industry practice.
2.3. Specific dosage standards
According to GB 2760-2024, the dosage of L-cysteine hydrochloride used for natural fruit juice is 0.2-0.8 g/kg.
2.4. Collaborative antioxidant system
Research has shown that the best reduction effect occurs when the molecular ratio of ascorbic acid to L-cysteine in stable food antioxidants is 1:1. This collaborative system not only effectively prevents food spoilage, but also inhibits the generation and blackening of dyes, making it the "golden formula" of the juice beverage industry.
3. Meat processing: a "safety barrier" for color protection, preservation, and inhibition of carcinogens
In the field of meat processing, l-cysteine powder exhibits multiple protective functions and is an indispensable functional additive in the meat industry.
3.1. Color protectant function
Its thiol group can react with oxidative substances in meat, preventing oxidation reactions and protecting pigments such as myoglobin from oxidation, thus maintaining the bright red color of meat products.
It is worth mentioning that its coloring effect is better than traditional nitrite, and it can fundamentally avoid the health hazards caused by nitrite.
3.2. Prevent the formation of nitrosamines
This is its most strategically significant function in meat processing. When L-cysteine is added, not only is the coloring effect better than traditional nitrite, but it can also effectively prevent the carcinogenic effect of dimethyl nitrosamine (NDMA). This characteristic makes it an ideal color protectant to replace nitrite, which is of great significance for safeguarding consumer health.
3.3 Antioxidant and antibacterial preservation
It can form complexes with metal ions (such as iron and copper) in meat, reducing the catalytic effect of metal ions on oxidation reactions. At the same time, it also has a certain antibacterial effect, which can inhibit the growth and reproduction of microorganisms and extend the shelf life of meat products.
3.4. Metal ion chelation
Experiments have shown that feeding rats and chickens with high doses of inorganic copper can significantly reduce copper deposition in the liver, indicating its significant chelating ability towards metal ions. This characteristic can effectively prevent metal catalyzed oxidation and spoilage in meat processing.
4. Dairy products and milk powder: the "dual effect factor" of antioxidant and nutritional enhancement
It also shines brightly in the dairy industry, especially in the milk powder industry where it holds an irreplaceable position.
4.1. Prevent milk powder from oxidizing and deteriorating
Japan often uses it in milk powder to prevent it from spoiling. The reducing property of its thiol group effectively prevents the oxidation of fat and protein in milk powder, prolongs the shelf life of milk powder, and maintains its freshness and nutritional value.
4.2. Nutritional enhancement and flavor improvement
Adding L-cysteine to dairy products such as yogurt and ice cream can enhance their taste and quality. As a nutritional enhancer, its added amount should not exceed 2.3% of the total protein content (including L-cysteine).
4.3. Stable amino acid infusion
It can also be used as a stabilizer in amino acid infusion to prevent the oxidation and degradation of amino acids in infusion, ensuring the quality and safety of infusion products.
At present, the synthesis of L-cysteine powder mainly includes hair hydrolysis reduction, enzymatic synthesis, chemical synthesis and fermentation. The production of L-cysteine in China mainly depends on the hydrolysis of hair acid to extract L-cystine, and then the chemical or electrolytic reduction of L-cystine to obtain L-cysteine. There are two methods of enzymatic synthesis and chemical synthesis abroad. Various production methods are described as follows:
The main component of hair (hair, pig hair, feather stem) is keratin, which is composed of various n-amino acids, in which L-cysteine content is 12-14. Therefore, in industry, it is often used to hydrolyze hair to produce L-cystine, and then obtain L-cysteine through electrolytic reduction.
The hydrolysis of keratin generally adopts two methods: alkali hydrolysis and acid hydrolysis. Because the alkali hydrolysis method destroys the amino acid after the hydrolysis of keratin seriously and the yield is low, in addition, the alkali hydrolysis will also produce the racemic reaction of amino acid, so the acid hydrolysis method is generally used for production at present. The L-cystine obtained by acid hydrolysis needs to be further reduced by electrolysis or tin powder to obtain L-cysteine.
In 1997, the Department of Chemistry of Sichuan University proposed the way of chemical synthesis of L-cysteine based on the "asymmetric synthesis principle". The synthesis principle is to use chloroalkanes to obtain cysteine through oxidation reaction, addition reaction, reduction reaction and substitution reaction. The extraction rate of cysteine is 7.5. The chemical synthesis of cysteine requires multi-step reaction to produce DL type racemate. Only through chemical resolution can the required L-cysteine be obtained for the synthesis of L-cysteine intermediates.
The fermentation production is now in the stage of exploration, and large-scale production is still limited by certain conditions. The main reason is that the synthesis process of L-cysteine in microorganisms is complex, and the key problem in the synthesis is the source of SH. For most plants and microorganisms, one SH group originates from S (); 1, However, S () j - can be reduced to some sulfide, which is a difficult problem to be solved in the production of L-cysteine by fermentation.
At present, it has not been reported that L-cysteine is produced by fermentation with wild type strains. However, some foreign scholars have studied the enzyme system and regulatory gene of L-cysteine production by bacteria, and tried to ferment L-cysteine with mutant or engineering strain.
Enzymatic synthesis of useful substances, mostly expensive fine chemical products, is characterized by optical activity and simple process, which is incomparable to chemical synthesis. In recent years, the technology of enzymatic preparation of amino acids from microorganisms has developed rapidly.
Genetic engineering technology has been widely applied to the improvement of microbial strains. It not only expands the direction and scope of strain improvement, but also enables the transformation of microbial strains from unknown mutation and mutagenesis to targeted mutation.
It mainly enhances the production capacity of production strains through the following ways:
(1) using polymerase chain reaction (PCR) technology to modify target genes to increase the vitality of gene products;
(2) Use strong promoters or independent promoters to enhance the transcription number of target genes;
(3) Cloning the target gene into a standard strain or other strains that are easier to obtain the product, for example, transferring the target gene into a strain that is resistant to enhanced substrate tolerance or feedback inhibition of the product;
(4) Cloning of active genes or deletion inhibitory genes that are conducive to the transcription of the target gene.
adverse reaction
L-Cysteine is a sulfur-containing non essential amino acid that is widely present in nature and participates in various key metabolic processes in living organisms. Although it has a wide range of applications in the fields of food, medicine, cosmetics, etc., excessive or improper use may cause a series of adverse reactions:
Adverse reactions related to oral supplements
Digestive system reactions
Common symptoms:
Nausea, vomiting, diarrhea, abdominal pain, dry mouth, and bad breath.
Mechanism:
The thiol group (- SH) of L-Cysteine is irritating and may directly stimulate the gastrointestinal mucosa; High dose intake can disrupt the balance of gut microbiota and lead to diarrhea.
Suggestion:
The initial dose should be halved and gradually increased to the recommended amount (usually 500-1000mg per day). Take with meals or immediately after meals to reduce gastrointestinal irritation.
Allergic reactions
Common symptoms:
Pruritus, rash, urticaria, facial flushing, difficulty breathing, and rare anaphylactic shock.
Mechanism:
L-Cysteine may act as a hapten, binding with proteins in the body to form a complete antigen, triggering an immune response.
Suggestion:
Perform a skin prick test or serum IgE test before first use.
Stop taking medication immediately if allergic symptoms appear and seek medical attention for anti allergic treatment. People with allergies should use it with caution.
Metabolic and electrolyte disorders
Common symptoms:
Acidosis, hypokalemia, hyperammonemia (rare).
Mechanism:
L-Cysteine metabolism produces sulfates, and excessive intake may increase the burden on the kidneys, leading to metabolic acidosis. High doses of NAC may promote the transfer of potassium ions into cells, leading to hypokalemia.
Suggestion:
Patients with renal insufficiency should avoid using high-dose L-Cysteine. Long term users should regularly monitor their blood potassium, blood ammonia, and acid-base balance. Patients with liver dysfunction should use it under the guidance of a doctor.
Patients with liver dysfunction experience impaired l-cysteine powder metabolism and ammonia accumulation leading to hyperammonemia.
Neurological response
Common symptoms:
Headache, dizziness, drowsiness, insomnia, anxiety (conflicting reactions).
Mechanism:
L-Cysteine may cause central nervous system symptoms by affecting glutamate metabolism, disrupting neurotransmitter balance.
Suggestion:
Avoid taking before bedtime to prevent affecting sleep.
If neurological symptoms occur, it is necessary to evaluate whether there is any interaction with other medications (such as antidepressants). Long term users should undergo regular neurological function assessments.
Frequently Asked Questions
Who should not take L-cysteine?
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Pregnancy and Breastfeeding: The safety of L-Cysteine supplementation during pregnancy and breastfeeding is not well-established. Therefore, it is generally recommended to avoid its use during these periods unless prescribed by a healthcare provider.
What foods are high in L-cystine?
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It is more abundant in animal and cereal proteins than in legume proteins. 6 Foods rich in cysteine include poultry, egg, beef, and whole grains.
What are the signs of L-cysteine deficiency?
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Deficiency Symptoms:
Cysteine deficiencies identified by inherited metabolic disorders or reduced levels in body fluid have been associated with: 1) impaired antioxidant defenses; 2) decreased ability to metabolize drugs or toxic compounds; 3) depressed immune functions; 4) some psycoses; and 5) homocystinemia.
Does cysteine cause weight gain?
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Dietary cystine substantially suppressed metabolic rate. In line with this, dietary cyst(e)ine increases weight gain in the face of reduced [18] or unchanged [17] food intake, suggesting that cysteine affects the energy expenditure arm of the energy balance equation.
How to get L-cysteine naturally?
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Cysteine is found in many high-protein foods, including meat, dairy products, legumes, and nuts. The body can also synthesize its own cysteine, by converting the amino acid methionine to cysteine - a process that takes place in the liver.
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