Cocrystal of Lutein with Improved Stability and Bioavailability

Area of Science:

• Pharmaceutical Science
• Materials Science
• Nutraceuticals

Background:

• Lutein (LT), a natural carotenoid, offers vision protection and antioxidant benefits but suffers from poor stability and low bioavailability due to its chemical structure.
• Challenges in lutein production, processing, and storage arise from its sensitivity to light and oxygen.
• Limited solubility and bioavailability hinder the therapeutic and nutritional efficacy of lutein.

Purpose of the Study:

• To develop a novel lutein (LT) cocrystal to overcome its inherent stability and bioavailability limitations.
• To characterize the physicochemical properties of the LT-APC cocrystal.
• To evaluate the enhanced solubility, wettability, and pharmacokinetic profile of the LT-APC cocrystal compared to pure lutein.

Main Methods:

• Cocrystallization of lutein with adipic acid to form LT-APC.
• Comprehensive characterization including melting point, chemical stability assessments, and dissolution studies in simulated gastric and intestinal fluids.
• Wettability evaluation using contact angle determination and film flotation.
• Pharmacokinetic studies in rats to assess Cmax and AUC.

Main Results:

• The LT-APC cocrystal formation successfully increased the melting point and significantly improved the chemical stability of lutein.
• Dissolution experiments revealed a much higher apparent solubility for the LT-APC cocrystal in simulated gastric and intestinal fluids.
• Pharmacokinetic studies in rats showed a 3.4-fold higher Cmax and 2.2-fold higher AUC for the LT-APC cocrystal compared to marketed lutein.

Conclusions:

• Cocrystallization with adipic acid is an effective strategy to enhance the physicochemical properties and bioavailability of lutein.
• The developed LT-APC cocrystal offers improved stability, solubility, and pharmacokinetic performance, paving the way for better lutein formulations.
• This approach holds promise for optimizing the delivery and efficacy of lutein in nutritional and therapeutic applications.