Study of rosin glycerol esters as microencapsulating materials

Area of Science:

• Materials Science
• Pharmaceutical Technology
• Polymer Chemistry

Background:

• Rosin esters are natural resin derivatives with potential applications in drug delivery.
• Controlling the properties of rosin esters, such as acid value, is crucial for formulation development.
• Microencapsulation is a key technique for protecting active pharmaceutical ingredients and controlling their release.

Purpose of the Study:

• To synthesize rosin esters with varying acid values.
• To encapsulate salicylic acid granules using these rosin esters.
• To evaluate the physicochemical properties and drug release characteristics of the microcapsules.

Main Methods:

• Rosin and glycerol were heated to produce intermediate rosin esters.
• Intermediate products with specific acid values (122, 105, 55) were isolated.
• Salicylic acid granules were microencapsulated using a 10% rosin ester solution in acetone.
• Evaluated moisture absorption, flow properties, and in vitro dissolution profiles.

Main Results:

• Rosin esters and intermediates with acid values of 122, 105, and 55 demonstrated superior moisture protection.
• Microencapsulation with these rosin esters yielded coated microcapsules with favorable flow properties.
• Dissolution studies indicated a potential for delayed drug release.

Conclusions:

• Rosin esters with specific acid values offer excellent moisture barrier properties for microencapsulation.
• The developed microcapsules are suitable for the delayed release of salicylic acid.
• Rosin esters represent a promising excipient for pharmaceutical formulations requiring moisture protection and controlled release.