BEYOND BOUNDARIES MICROCAPSULES TRANSFORMING MODERN PHARMACEUTICES

Microcapsules are tiny particulate systems with diameters that normally range between 1 to 1000 µm, comprising of an active core material enveloped in a protective shell. The core may consist of drugs, flavours, enzymes, fertilizers, microorganisms, or other functional agents, whereby the shell shields the core from the external environment and offers controlled release. Microencapsulation is used for various purposes, such as to provide for controlled or sustained release of the active principle; to protect sensitive materials from deterioration by light, heat, moisture, oxygen, or pH; and to avoid undesired interactions, for example, taste, odour, or chemical incompatibilities. Because of this versatility, microcapsules have attained widespread use in pharmaceuticals, food and beverages, textiles, cosmetics, and agriculture. As applied to pharmaceuticals, microencapsulation enhances the stability and bioavailability of APIs, masks unpleasant tastes or odour, reduces toxicity, facilitates site-specific or timed release, and puts liquids and gases into more convenient solid forms. Encapsulation is used in the food industry to protect vitamins, flavors, anti-microbials, and probiotics; to enhance shelf-life and sensory properties; and to enable controlled release in complex matrices. Textiles, cosmetics, and agriculture employ various stimuli-responsive delivery mechanisms using microcapsules based on pressure, temperature, or pH to realize fragrance delivery, colour release, and exact administration of agrochemicals and fertilizers. By carefully designing the core composition, shell material, particle size, morphology, and release mechanism, microcapsules can be engineered for a targeted performance. In summary, microencapsulation has been recognized as an effective way of enhancing the stability, bioavailability, and efficiency of delivery of functional agents in a number of industrial applications, with tailored solutions not only for current but also emerging technological needs.