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Zhishang Chemical

Pure Kojic Acid CAS 501-30-4

Molecular Formula: C6H6O4

Formula Weight: 142.11

ZSpharmac: Pure Kojic Acid Supplement

Product Name: Pure Kojic Acid
CAS No: 501-30-4
Purity: 99%

Basic Info

Product Name:Pure Kojic Acid
Other Names:Kojic acid
Place of Origin:Shandong, China
Brand Name:ZSpharmac
Type:Cosmetic Raw Materials
Appearance:White to Beige-Brown Crystalline Powder
EINECS No.:207-922-4
Storage:Store Below +30°C.
Provide:Pure Kojic Acid MSDS;
Pure Kojic Acid COA

What is Pure Kojic Acid?

Pure Kojic Acid, also known as kojic acid and juic acid, is an organic acid with antibacterial effect produced by aerobic fermentation of glucose by Aspergillus candida at 30-32 °C. Its molecular structure is a substituted γ-pyrone. Among the γ-pyrone compounds that exist in nature, the only well-known compounds are kojic acid and maltol. In 1907, Saito isolated kojic acid crystals from rice koji. It was named by Yabuta in 1912 and its structure was determined in 1924. In 1953 Arnstela (surface fermentation) and Kita Makoto (submerged fermentation) in 1971 used isotope tracing technology to prove that kojic acid was formed by direct oxidation and dehydration of glucose without carbon frame fracture.
Pure Kojic Acid is present in koji, it’s something people eat and it’s safe to use. In recent years, a large number of patent documents have reported the application of kojic acid in cosmetics.Pure Kojic Acid can chelate copper tyrosinase to inactivate it, which is the basis of its whitening effect. Clinical and application test results show that kojic acid has a strong inhibitory effect on the production of melanin in human skin, and is safe, non-toxic, and will not cause vitiligo sequelae. Kojic acid and other preparations (such as SOD, placenta extracts, amino acids, sunscreens and various plant extracts, etc.) are more effective when used in combination. Kojic acid is mainly used in skin whitening products, anti-aging products, sunscreen products, whitening facial cleansers and beauty cosmetics. Pure Kojic Acid has certain antibacterial activity. Gram-negative bacteria are more sensitive to sodium kojjjer than Gram-positive bacteria, whereas most other antimicrobial substances are the opposite. The antibacterial effect of kojic acid is much lower than that of other antibacterial substances, and its antibacterial activity is bacteriostatic rather than bactericidal. Pure Kojic Acid is ineffective against yeast, viruses and bacteriophages.

Pure Kojic Acid Properties:

Melting point 152-155 °C (lit.)
Boiling point 179.65°C (rough estimate)
density 1.1712 (rough estimate)
refractive index 1.4434 (estimate)
storage temp. Store below +30°C.
solubility DMSO (Slightly), Methanol (Slightly, Sonicated)
pka7.9(at 25℃)
form Crystalline Powder
color White to beige-brown
Water Solubility SOLUBLE


Pure Kojic Acid Uses

Pure Kojic Acid has the potential to develop into a new type of food additive. Its performance as a food preservative is more ideal than that of sorbic acid. Pure Kojic Acid can be used for the preservation of fresh vegetables, fruits, seafood, etc. For example, soaking cut apples, bananas, potatoes and mushrooms in 0.1% kojic acid solution for about 1 hour can effectively prevent browning. Crab meat, shrimp meat and other seafood are treated with 0.25% to 0.6% kojic acid and 0.1% sodium sulfite solution by spraying or soaking methods to treat vegetables that are easily spoiled and deteriorated such as mushrooms and spinach. Spinach remained fresh after 4 days with very little shrinkage. Soak roses, roses and other cut flowers in 0.1% kojic acid solution at room temperature for 8 days. Kojic acid acts as an antioxidant to prevent oil deterioration and prevent browning of raw noodles. It is more effective in combination with ascorbic acid. Kojic acid can partially replace sodium nitrite in color protection and hair color, and can inhibit the conversion of nitrite into carcinogenic nitrosamines. Studies suggest that the preservation mechanism of kojic acid is to inhibit polyphenol oxidase (ie tyrosinase) in plants and crustaceans. As mentioned above, kojic acid integrates antibacterial, antiseptic, fresh-keeping, color protection, anti-oxidation, etc., and is a potential food additive with superior performance.

Pure Kojic Acid is a tyrosinase inhibitor, which can preemptively boil with copper ions in tyrosinase, making the copper ions ineffective, thereby inhibiting the synthesis of dopachrome. Pure Kojic Acid can inhibit the polymerization of 5,6-dihydroxyindole (DHI) and inhibit the activity of DHICA oxidase. Cosmetics added with kojic acid have the functions of skin care, emollient, whitening, brightening, sun protection, and freckle removal. The dosage forms include cream, lotion, lotion, soft film powder, clay glue, powder cake, etc. The earliest (in 1987) developed in China and approved by the Ministry of Health (in 1991) is the 142-kojic acid freckle cream from Nanjing Shishantou Pharmaceutical Factory. Its kojic acid content has two specifications of 1.5% and 2.0%. It is mainly used to treat various pigmentation disorders, such as chloasma (pregnancy spots, café-au-lait spots), secondary pigmentation disorders and melanosis. The total effective rate for chloasma is over 85%. Sanmingfeng et al. reported that the cream containing 1% or 2.5% kojic acid was applied to patients with chloasma, sunshine, senile dark spots, pigment accumulation and freckles caused by inflammation, and applied it for more than 2 months. The results were as follows: more than 93 cases (45.6%) were effective (45.6%); 151 (74%) were slightly effective (74%); there was little difference between 1% and 2.5% of kojic acid dosage. Pure Kojic Acid tends to turn yellow when exposed to light and heat, which affects the shelf life of kojic acid cosmetics. Low temperature storage, addition of ascorbic acid and sunscreens such as oxybenzone (2-hydroxy-4-methoxybenzophenone) can enhance its stability.

The complex of Pure Kojic Acid and divalent heavy metal is better than Bordeaux mixture (an insecticidal and bactericidal agent) for several plant fungal diseases. The above-mentioned kojic acid complex is easy to prepare, and can be sprayed on the leaves to adhere firmly without damaging the plants. These metal groups are linked to kojic acid in a non-ionic form, so the toxicity to humans is very low, and it is safer than Bordeaux mixture. Kojic acid is also an activator of nicotinic insecticides. When dealing with melon silkworm (Diaphaniahyalinata L.) and subtropical armyworm (Prodeniaeridaniacram.), spray in 5% nicotine sulfate pyrophyllite powder or 5% nicotine bentonite When 5% kojic acid was added to the drug, its toxicity increased by 35% and 50%, respectively. Pure Kojic Acid can also be used alone as an insecticide. Its mechanism of action is: in the coexistence with the individual pests, it affects the reproduction of the pests, disturbs its hormone system, and then eliminates all the pests. Unlike traditional pesticides, it can not only kill all pests, but also harmless to humans and animals, and does not pollute the environment. Nickell and Gordon (1963) have recommended kojic acid as a plant growth stimulator. From the perspective of patents in recent years, kojic acid is very promising as a crop yield enhancer. The method is to spray the leaves of crops or infiltrate the roots and seeds with kojic acid or its salt, which can promote the rooting of crops and the initial growth of stems and leaves, promote flowering and fruiting, and improve yield and quality. For example: spray sweet potato seedlings with 0.01-1000mg/L kojic acid solution before planting, the harvested sweet potato starch content increases by 10%-20%, and the total yield increases by 20%-30%; from tomato flowering to harvest, on the leaf surface After spraying 100mg/L kojic acid solution 8 times, the ripeness, sugar content and individual body weight of tomatoes all increased significantly. my country is a big producer of hybrid rice. At present, the seeds of hybrid rice need to be treated with “920”. Considering the advantages of Pure Kojic Acid in terms of yield and cost, it may make a difference in increasing the production of major food crops such as rice, corn, and wheat.

The production of Pure Kojic Acid by microbial fermentation refers to the process and technology of mass production of kojic acid by microbial fermentation. Kojic acid is an acidic metabolite produced by microorganisms such as Aspergillus oryzae, which is soluble in water, ethanol or acetate. Most of the microorganisms that can produce Pure Kojic Acid are fungi, such as Aspergillus oryzae, A. flavo-oryzae, A. flavus, A. candidus, A. clavatus), A. giganteus, A. fumigatus, A. tamarii, A. Wentii, A. glaucus, etc. Certain bacteria such as Gluconobacterroseus, Gluconobacter cereus (G. cerinus) and several Pseudomonas (Pseudomonaspp) can also utilize carbohydrates to produce kojic acid. The basic fermentation process is: hydrolysis of sweet potato flour by α-amylase → sterilization → cooling in fermentation tank → inoculation of Aspergillus oryzae seeds (from seed tank) → aeration fermentation at about 32 ° C (about 5 days) → suction filtration of fermentation liquid → production Zinc salt of kojic acid→concentration under reduced pressure→crystallization→acidification→kojic acid. Pure Kojic Acid is the raw material for the manufacture of flavoring agents maltol and ethyl maltol in food and daily necessities, as well as for the production of insecticides, fungicides and film dust removers. If it occurs with certain aliphatic carboxylic acids After acylation, kojic acid ester can be obtained, which is the raw material for the manufacture of whitening cosmetics.

Safety of Pure Kojic Acid

In the early 1990s, Japan took the lead in adding Pure Kojic Acid to cosmetics as a whitening ingredient, mainly using its inhibitory effect on tyrosinase and blocking of melanin production intermediates to whiten skin and remove pigmentation. Subsequent studies found that kojic acid may have a carcinogenic risk. In 2003, Japan officially banned the import and reproduction of cosmetics containing kojic acid. Later, due to insufficient evidence, in 2005, the regulations on adding kojic acid to cosmetics were reopened. However, the recommended dosage is between 0.1% and 1% by mass. At present, kojic acid is listed in the list of three types of carcinogens published by the International Agency for Research on Cancer of the World Health Organization, which has aroused great concern about the safety of kojic acid. management regulations used.

The toxicity kinetics study on rats showed that Pure Kojic Acid was rapidly absorbed and distributed to various organs after oral, dermal or subcutaneous administration, and the metabolism rate of oral and subcutaneous administration was faster than that of skin exposure, and the metabolites were mainly sulfuric acid and Conjugates of glucuronic acid and kojic acid metabolites are found in liver and kidneys, and are mainly excreted in urine. In recent years, many foreign scholars have carried out a lot of research on the genotoxicity, carcinogenicity, embryotoxicity and teratogenicity of kojic acid, and mutagenicity of genetic material. The LD50 of kojic acid is in the range of 1000-1500 mg/kg. Oral kojic acid doses in the range of 300-1000 mg/(kg·d), regardless of male or female rats, their various clinical physiological and biochemical indicators are normal, and necropsy and microscopic observation have not found any effect, only lymphocytes. and white blood cells decreased slightly. The intraperitoneal route of administration was used, and the dose of kojic acid was 300 mg/kg each time. After 14 days, the rats developed hepatotoxicity and pathological phenomenon. The results of studies on the effects of Pure Kojic Acid on the fertility and embryos of rats are uncertain.

Whether Pure Kojic Acid has a mutagenic effect on the genetic material of organisms, except that kojic acid can induce mutations in the genes of certain strains of Salmonella and Bacillus subtilis, different researchers have obtained different conclusions.Sustained high doses of kojic acid can inhibit the absorption of iodine in mice and rats, induce thyroid hyperplasia and adenoma, and the addition of kojic acid to food may have the risk of inducing thyroid tumors, but the current test is limited to mice and rats. There is no other animal test evidence. However, the concentration of Pure Kojic Acid in food is extremely low and should be safe to use under normal circumstances.

Company Profile and Corporate Culture

Company Profile:

ZhiShang Chemical is owned by ZhiShang Group is a professional new-type chemicals enterprise combined into research and development, production and sales .

The company’s competitive product is pharmaceutical raw materials and intermediates (especially carbohydrate derivatives Series), In recent years, the company has made a major breakthrough in food and feed additives, plant extraction, industrial chemicals industry .

The company insists on the spirit of “sincere management, strict quality control, customer as god” , get consistent high praise from customers at home and abroad.

Corporate Culture:

Help China Chemicals to benefit the happiness of human life
Become the most trusted chemical supplier in the world
Striver – oriented, enrich employees, customer first, deep service, seek development
Be prepared for danger in times of peace, forge ahead actively, unity and cooperation, and be brave to fight

About Us

The production base is located in Zhangqiu chemical industry park and Tai’an high-tech chemical industry park. laboratory and workshop in strict accordance with the GMP standard and the product fit national ISO9001 and ISO2000 standards.

“Zhishang” products are exported to Europe, North and South America, the Middle East, Asia Pacific and Africa area, so as to establish a long-term and stable cooperation relationship with customer in the world.

Company Info
  • Business Type: Manufacturer
  • Product Range: Additive , Chemical Auxiliary & Catalyst , Organic Chemicals
  • Products/Service: Organic Intermediate,Inorganic Chemistry, APIs, Dyestuffs And Pigments, Fragrance And Spices, Food Additives
  • Total Employees: 51~100
  • Capital (Million US $): 10000000RMB
  • Year Established: 2016
Production Capacity
  • No. of Production Lines : 8
  • No. of QC Staff : 5 -10 People
  • OEM Services Provided : yes
  • Factory Size (Sq.meters) : 3,000-5,000 square meters
  • Certificate: ISO9001 , CE , GMP , API , MSDS
  • Factory Location : Diao Town Industry Park, Zhangqiu City, Jinan City, Shandong Province, China.


Pre-Sales Service

* Prompt reply and 24 hours online, professional team to provide best price and high quality product.

* Sample testing support.

* Every batch of products will be tested to ensureits quality.

*The packing also can be according the customers` requirment.

*Any inquiries will be replied within 24 hours.

*we provide Commerical Invoice, Packing List, Bill of loading, COA , Health certificate and Origin certificate. If your markets have any special requirements, let us know.


After-Sales Service

*The fact of logistics information monitoring.

* Any questions about the product can be consulted at any time.

*Product has any problem can return.


Do you accept sample order?

We will make samples before mass production, and after sample approved, we’ll begin mass production. Doing 100% inspection during production, then do random inspection before packing.



You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.

What’s your MOQ?

Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.

Do you supply product report?

Yes. We’ll give you product analysis report before shipping.

  Is there a discount?

Different quantity has different discount.


1. ≤50kg, Express delivery recommended, usually called as DDU service;

2. ≤500kg, Air shipping recommended, usually called as FOB, CFR, or CIF service;

3. >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;

4. For high value products, please select air shipping and express delivery for safe.

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