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Pullulan Capsule CAS 9057-02-7

Today, many people are highly concerned about what they consume. They are seeking products with a ‘clean label,’ meaning they believe these products are healthier because they do not contain artificial or other ‘unwanted’ ingredients.

Unveiling Pullulan Capsule— The Fusion of Nature and Technology

Pullulan is produced through fermentation by the fungus Bacillus subtilis in specific culture media (such as sucrose, glucose, etc.) and is a natural metabolic product of microorganisms, not chemically synthesised or extracted from plants. It possesses elastic structure, high solubility, film-forming properties, gas barrier properties, plasticity, viscosity, and other characteristics. It is easily soluble in water, non-toxic, harmless, colourless, and odourless.

Beyond Gelatin: The Disruptive Advantages of Pullulan Capsules

  • Reliable source: Pullulan capsule are made from polysaccharides produced by microbial fermentation, with raw materials sourced from renewable resources. They contain no animal-derived ingredients and are 100% suitable for vegetarians and those with religious dietary restrictions. In contrast, gelatin capsules rely on animal slaughter, posing risks from pathogens such as mad cow disease and foot-and-mouth disease, and facing significant environmental pressures.
  • Superior oxygen barrier performance: The oxygen permeability of pullulan capsule is only 1/8 that of gelatin and 1/300 that of HPMC, minimising the risk of oxidation of the contents. For easily oxidised components like fish oil and vitamin C, their shelf life can be extended by 3-5 times. Gelatin capsules, however, contain animal protein and have weak oxygen-barrier properties, which can lead to the contents becoming rancid or discoloured. Additionally, in high-temperature, high-humidity, or extremely dry environments, pullulan capsule can maintain their shape stability and are less prone to sticking or cracking.
  • Rapid disintegration: Pullulan capsule disintegrate in gastric fluid within ≤20 minutes, with a stable drug release rate and no risk of cross-linking reactions; gelatin capsules may undergo cross-linking due to residual aldehydes, leading to delayed disintegration (＞30 minutes) or incomplete release. Additionally, pullulan capsule can be directly coated with an enteric coating to form a pH-sensitive release system, whereas gelatin capsules require prior acid-resistant pre-treatment, which is a complex process with poor stability.
  • High transparency: Pullulan solution can form a film rapidly using low-temperature shaping technology at -40°C without the need for gelling agents, resulting in a 30% increase in production efficiency compared to traditional gelatin capsules; Furthermore, pullulan capsules have transparency >90%, with a smooth surface like glass, enabling direct printing of high-resolution labels, whereas gelatin capsules require titanium dioxide whitening coatings, which have poor print adhesion and are prone to peeling.
Cutting-Edge Applications and Future Trends
  1. Pharmaceutical and Health Supplement Industry: Pullulan capsules can be chemically modified to achieve pH-sensitive precise release; pullulan combined with cationic polymers forms a nano-carrier that can efficiently encapsulate CRISPR-Cas9 plasmids, penetrate cell membranes through electrostatic interactions, and achieve targeted delivery to the cell nucleus.
  2. Food Innovation: Edible packaging, such as ‘edible cups/bags’ for holding condiments, beverages, or even cocktails, achieves zero waste.
  3. Sustainable Solutions: Functionalised pullulan hydrogels exhibit an adsorption capacity of 332.54 mg/g for paracetamol in water, maintaining 69% adsorption efficiency after five cycles of reuse, making them suitable for pharmaceutical wastewater treatment.
  4. 3D Bioprinting and Tissue Engineering: The Spanish Ibec team has developed a graphene oxide-pullulan hydrogel bioink combined with visible light crosslinking technology, enabling the printing of three-dimensional skin models containing fibroblasts within 10 seconds.
Challenges and Considerations
  • Cost issues: Production costs are currently still higher than those of gelatin, but this is improving as technology scales up and consumer willingness to pay increases.
  • Mechanical properties: Compared to certain synthetic polymers, there is still room for improvement in terms of mechanical strength and performance under extreme conditions.
  • Consumer awareness: Market education still needs to be strengthened to help consumers understand its value as a ‘high-end,’ ‘sustainable,’ and ‘high-tech’ product.

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