Pullulan is a polysaccharide polymer made up of repeating glucose units linked together. It is produced by certain strains of fungi, particularly Aureobasidium pullulans. Pullulan is a natural and edible polymer that has a wide range of applications in the food, pharmaceutical, and cosmetic industries due to its unique properties.

Some key characteristics and uses of pullulan include:

1. Edible Film and Coating: Pullulan is often used to create edible films and coatings for food products. It can improve the appearance and shelf life of various items, including candies, chocolates, and pills.
2. Encapsulation: It is used for encapsulating flavors, fragrances, and active ingredients in the food and pharmaceutical industries. This helps protect these sensitive compounds from degradation and enhances their stability.
3. Thickening Agent: Pullulan can be used as a thickening and gelling agent in food products, such as salad dressings, sauces, and dairy products.
4. Controlled Release: In the pharmaceutical industry, pullulan can be used to control the release of drugs and other active compounds in oral dosage forms.
5. Biodegradable Packaging: Due to its biodegradable nature, pullulan is being explored as an eco-friendly alternative to traditional plastics for packaging applications.
6. Adhesive Properties: Pullulan can be used as an adhesive in various applications, including labels and stamps.
7. Health and Wellness Products: It is used in dietary supplements and wellness products due to its non-toxic and biocompatible properties.

Pullulan is generally recognized as safe (GRAS) by the U.S. Food and Drug Administration (FDA) and is considered a safe ingredient for use in food and pharmaceutical products. Its versatility and desirable properties make it a valuable component in various industries.