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Description References
Natamycin structure
Chemical Name:
Molecular Formula:
Formula Weight:
MOL File:

Natamycin Properties

Melting point:
2000C (dec)
Boiling point:
D20 +278° (c = 1 in CH3COOH)
1.0 g/mL at 20 °C(lit.)
refractive index 
1.5960 (estimate)
Flash point:
storage temp. 
Keep in dark place,Inert atmosphere,2-8°C
Soluble in DMSO
aqueous suspension
pKa 4.6(50% aq. MeOEtOH) (Uncertain);8.35 (Uncertain)
Water Solubility 
0.41g/L(21 ºC)
Light Sensitive
Light sensitive
Substances Added to Food (formerly EAFUS)
EWG's Food Scores
EPA Substance Registry System
6,11,28-Trioxatricyclo[,7]octacosa-8,14,16,18,20-pentaene-25-carboxylic acid, 22-[(3-amino-3,6-dideoxy-.beta.-D-mannopyranosyl)oxy]-1,3,26-trihydroxy-12-methyl-10-oxo-, (1R,3S,5R,7R,8E,12R,14E,16E,18E,20E,22R,24S,25R,26S)- (7681-93-8)
  • Risk and Safety Statements
Hazard statements  H303
Hazard Codes  Xn
Risk Statements  22
Safety Statements  24/25-36
WGK Germany  2
RTECS  TK3325000
HS Code  29419090
Toxicity LD50 orally in male, female rats (g/kg): 2.73, 4.67 (Levinskas)

Natamycin price More Price(15)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 32417 Natamycin VETRANAL 7681-93-8 50mg $128 2021-03-22 Buy
Sigma-Aldrich 1457505 Natamycin United States Pharmacopeia (USP) Reference Standard 7681-93-8 200mg $366 2021-03-22 Buy
Sigma-Aldrich 527962 Pimaricin, Streptomyces chattanoogensis - CAS 7681-93-8 - Calbiochem 7681-93-8 1 g $1248.75 2021-03-22 Buy
Alfa Aesar J66468 Natamycin, 95% 7681-93-8 50mg $125 2021-03-22 Buy
Alfa Aesar J66468 Natamycin, 95% 7681-93-8 100mg $147 2021-03-22 Buy

Natamycin Chemical Properties,Uses,Production


Pimaricin (also known as natamycin, INN) belongs to a naturally occurring antifungal agent produced through the fermentation of the bacterium Streptomyces natalensis. It is a kind of macrolide polyene antifungal used for the treatment of fungal keratitis, which is a kind of eye infection. In medical field, it can be used for the treatment of various kind of fungal infections caused by Candida, Aspergillus, Cephalosporium, Fusarium, and Penicillium. In food industry, it can be used as a natural preservative to prevent fungal outgrowth. Its mechanism of action is through binding to the ergosterol in the plasma membrane of fungi, inhibiting the process of ergosterol-dependent fusion of vacuoles and membrane fusion, further inhibiting the fungal growth. It also inhibit the transport of amino acid and glucose through inhibiting membrane transport proteins. 



Natamycin was discovered in the 1950s. As described by Struyk et al. A new crystalline antibiotic, pimaricin, has been isolated from fermentation broth of a culture of a Streptomyces species, isolated from a soil sample obtained near Pietermaritzburg, State of Natal, Union of South Africa. This organism has been named Strepyomyces natalensis. The original name "pimaracin" can be found in earlier publications but it is no longer accepted by the WHO. Natamycin is classified as a macrolide polyene antifungal and is characterized by a macrocyclic lactone-ring with a number of conjugated carbon–carbon double bonds. The full chemical name is 22-(3-amino-3,6-dideoxy-b-D-manno pyranosol) oxy- 1,3,26 trihydroxy-12-methyl-10-oxo-6,11,28-trioxiatri [] o catosa- 8,14,16,18,20-pentanene-25-carboxylic acid.
Natamycin has a low solubility in water (approximately 40 ppm), but the activity of neutral aqueous suspensions is very stable. Natamycin is stable to heat and it is reported that heating processes for several hours at 100 C lead to only slight activity losses. Natamycin is active against almost all foodborne yeasts and molds but has no effect on bacteria or viruses. The sensitivity to natamycin in vitro (minimal inhibitory concentration) is in most cases below 20 ppm.
Natamycin acts by binding irreversibly with ergosterol and other sterols, which are present in the cell membranes of yeasts and vegetative mycelium of molds. It disrupts the cell membrane and increases the cell permeability, which finally leads to cell death. The fungicidal of natamycin is an ‘‘all-or-none’’ effect, which destroys the cell membrane of the target cells.
Due its interaction with ergosterol, which is a major constituent of fungal cells, it is unlikely that fungi will develop resistance. So far, after many decades of use, no development of resistance has been reported. Natamycin is mostly used for surface applications, particularly for treating surfaces of hard cheese and salamitype sausages. One of the advantages over sorbate is that even the dissolved fraction of natamycin hardly migrates into the food matrix. Natamycin can be applied by spraying the surface (e.g. of cheese), by dipping, by applying natamycin via coating emulsions or by direct addition.
The antifungal efficacy of natamycin has been extensively studied and a substantial amount of scientific papers have been published. Comprehensive overview articles are available. However, due to its long history of use, no data on application studies have been published recently.

Chemical Properties

Natamycin (more commonly known as pimaricin) belongs to the polyene macrolide group of antifungal antibiotics. It was derived from Streptomyces natalensis or S. chattanoogensis. In therapeutic use, it is prescribed for a variety of fungal infections, mainly topically, but some ophthalmic applications as well. In addition to therapeutic and food use, pimaricin has applications including use as an agricultural chemical and wood preservative.
In the dry state, pimaricin is very stable, as long as it is protected from light and heat, and stability is maintained for a minimum of 1 to 2 years. As long as aqueous suspensions are stored in a cooland dark place, they can be kept for at least six months. Once placed on the surface of the cheese (pimaricin does not penetrate the surface of cheese as do sorbic acid salts), the antimycotic decomposes in about six weeks.

Chemical Properties

White to Off-White Solid




Natamycin (l), from Streptomyces nataIensis and Streptomyces chat tanoogensis, is used for the control of diseases of bulbs.


Polyene antifungal antibiotic


analgesic, antimigraine


Pimaricin is a macrocyclic tetraene originally isolated from Streptomyces natalensis in 1957. Pimaricin exhibits broad spectrum antifungal activity against yeast and filamentous fungi by binding specifically to ergosterol to block fungal growth. Unlike the related polyenes, nystatin and filipin, pimaricin does not change the permeability of the plasma membrane. Pimaricin is used in the food industry for surface treatment of cheeses as a mould inhibitor.


Pimaricin is a preservative for use as a coating on the surface of italian cheeses to prevent the growth of mold or yeast. It is tasteless, odorless, colorless, and does not penetrate the cheese. It is very active against virtually all molds and yeasts, but does not affect bacteria, thus not affecting the ripening and flavor improvement process of cheese. It can be applied as a dip, spray, or by other methods such as incorporation into the cheese coatings. It is used at levels ranging from 300 to 2,000 ppm.

Manufacturing Process

The Fermentation Process: The process by which this antifungal substance is produced is an aerobic fermentation of an aqueous nutrient medium The Fermentation Process: The process by which this antifungal substance is produced is an aerobic fermentation of an aqueous nutrient medium.
In more detail the nutrient medium used may contain sources of carbon such as starch, hydrolyzed starch, sugars such as lactose, maltose, dextrose, sucrose, or sugar sources such as molasses; alcohols, such as glycerol and mannitol; organic acids, such as citric acid and acetic acid; and various natural products which may contain other nutrient materials in addition to carbonaceous substances.
Nitrogen sources include proteins, such as casein, zein, lactalbumin; protein hydrolyzates such proteoses, peptones, peptides, and commercially available materials, such as N-Z Amine which is understood to be a casein hydrolyzate; also corn steep liquor, soybean meal, gluten, cottonseed meal, fish meal, meat extracts, stick liquor, liver cake, yeast extracts and distillers' solubles; amino acids, urea, ammonium and nitrate salts. Such inorganic elements as sodium, potassium, calcium and magnesium; and chlorides, sulfates, phosphates and combinations of these anions and cations in the form of mineral salts may be advantageously used in the fermentation.
The so-called trace elements, such as boron, cobalt, iron, copper, zinc, manganese, chromium, molybdenum and still others may also be used to advantage. Generally, these trace elements occur in sufficient quantities in the carbonaceous and nitrogenous constituents of the medium, particularly if derived from natural sources, or in the tap water, and the addition of further quantities of these trace elements may consequently be unnecessary.
The fermentation liquor is aerated in the customary manner by forcing sterile air through the fermenting mixture usually at the rate of about 1 volume of air per volume of fermentation medium per minute. To minimize contamination with foreign microorganisms, the fermentation vessels should be closed and a pressure of 2 to 15 pounds above atmospheric pressure maintained in the vessel. In addition to the agitation provided by aeration, mechanical agitation is generally desirable. Antifoaming agents, such as 1% octadecanol in lard oil, may be added from time to time as required to prevent excessive foaming. Fermentation is conducted at a temperature preferably on the order of 26°C to 30°C but may be as low as 17°C or as high as 42°C.
The time required for maximum production of the antifungal substance will vary considerably depending upon other conditions of the fermentation. Generally, about 48 hours is required before appreciable quantities of the antifungal substance are detected in the medium. The production of the antifungal substance increases with time, and the fermentation may run as long as 120 hours. The hydrogen ion conditions normally vary from about pH 6 to pH 8.0, although deviations from these values are permissible, according to British Patent 846,933. The reader is referred to the patents cited for detals of pimaricin purification.

brand name

Natacyn (Alcon).

Therapeutic Function

Antibacterial (ophthalmic)

Antimicrobial activity

The spectrum of Natamycin's activity is somewhat narrower than that of amphotericin and nystatin, but at the same time, it is less toxic. It exhibits especially pronounced activity against a few strains of Fusarium and Cefalosporium. Natamycin is a drug for treating superficial fungal infections, and it is used only for ophthalmologic purposes. Synonyms of this drug are pimafucin, pimaricin, tennecetin, and others.

General Description

Natamycin (pimaricin; Natacyn) is a polyene antibiotic obtainedfrom cultures of Streptomyces natalensis.The natamycin structure consists of a 26-membered lactonering containing a tetraene chromophore, an α,β-unsaturatedlactone carbonyl group, three hydroxyl groups, a carboxyl group, a trans epoxide, and a glycosidically joined mycosamine.Like the other polyene antibiotics, natamycin isamphoteric.The smaller polyenes are fungistatic and fungicidal within thesame concentration range.Natamycin possesses in vitro activity against severalyeasts and filamentous fungi, including Candida,Aspergillus, Cephalosporium, Penicillium, and Fusariumspp. The drug is supplied as a 5% ophthalmic suspension intendedfor the treatment of fungal conjunctivitis, blepharitis,and keratitis.

Safety Profile

Poison by intravenous, intramuscular, subcutaneous, and intraperitoneal routes. Moderately toxic by ingestion. When heated to decomposition it emits toxic fumes of NOx. Used as an antibacterial agent.

Chemical Synthesis

Natamycin, a mixture of stereoisomeric 22-[(3-amino-3,6-dideoxy-β-Dmannopyranosyl)oxy]-1,3,26-trihydroxy-12-methyl-10-oxo-6,11,28-trioxatricyclo[,7]-octacosa-8,14,16,18,20,penten-25-carboxylic acid (35.1.3), like amphotericin and nystatin, is a polyene antibiotic that is isolated from the products of the vital activity of the actinomycete Streptomyces natalensis.

Veterinary Drugs and Treatments

Natamycin is a semisynthetic polyene antibiotic. Natamycin is poorly water-soluble and will not penetrate the intact corneal epithelium. Natamycin is the only antifungal agent approved for use on the eye and the only commercially available eye drug for treatment of fungal keratitis.

Natamycin Preparation Products And Raw materials

Raw materials

Preparation Products

Natamycin Suppliers

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View Lastest Price from Natamycin manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2021-10-18 Natamycin
2021-09-29 Natamycin
US $0.00-0.00 / Kg/Drum 1KG 95%; USP 1000KG WUHAN FORTUNA CHEMICAL CO., LTD
2021-08-25 Natamycin
US $5.30 / KG 1KG 90% 200tons per week qingdao trust agri chemical co.,ltd

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