Microencapsulated Vitamin A Palmitate Degradation Mechanism Study To Improve the Product Stability

Area of Science:

• Nutritional Biochemistry
• Chemical Degradation Studies
• Materials Science

Background:

• Vitamin A Palmitate (VAP) is crucial for vision and immune function.
• Microencapsulation enhances VAP stability, but degradation pathways require detailed understanding.
• Oxidative degradation is a known issue for related compounds like beta-carotene.

Purpose of the Study:

• To identify and characterize the degradation products of microencapsulated VAP.
• To elucidate the chemical mechanism underlying VAP degradation.
• To develop strategies for improving VAP stability in microencapsulated formulations.

Main Methods:

• High-resolution mass spectrometry was employed to identify VAP degradants.
• Chemical reaction pathways were proposed based on identified degradation products.
• Comparative degradation studies were conducted under varying pH conditions.

Main Results:

• Four VAP degradants were identified, including anhydroretinol (ANHR) and palmitic acid (PA).
• A novel degradation mechanism involving ester thermal elimination (ETE) and subsequent ANHR reactions was proposed.
• Optimizing media pH from 4.2 to 6.2 reduced annualized VAP degradation from 22.3% to 4.8%.

Conclusions:

• VAP degradation is primarily driven by ester thermal elimination, not natural oxidation.
• Controlling media pH is critical for enhancing the stability of microencapsulated VAP.
• The findings enable the development of more stable VAP formulations, preventing premature degradation.