A molecular dynamics investigation of water migration in a lipid bilayer for microalgae drying

• Main Authors: Manrique, Robby B., Ubando, Aristotle, Villagracia, Al Rey C., Corpuz, Jennifer, Padama, Allan Abraham, David, Melanie, Arboleda, Nelson, Jr., Culaba, Alvin, Kasai, Hideaki
• Format: text
• Published: Animo Repository 2014
• Subjects: Microalgae—Drying; Bilayer lipid membranes; Biodiesel fuels; Chemistry; Materials Chemistry; Materials Science and Engineering; Physical Sciences and Mathematics
• Online Access: https://animorepository.dlsu.edu.ph/faculty_research/12319
• Institution: De La Salle University

Microalgae are one of the best candidates for biofuel production owing to their numerous advantages over other oil crops. However, challenges still exist in the entire production chain due to the high energy input at every step of the process, particularly the drying stage. This study investigated the mechanism of water extraction at the molecular level of an algal cell under the influence of osmotic pressure using Molecular Dynamics simulations. The calculated area per lipid of 0.67 mm2 of the cell membrane agrees well with other simulation and experimental results. Moreover, the membrane thickness and volume were seen to increase with rising temperature from 330 K. An osmotic pressure as low as 69.2 MPa showed a significant amount of water permeating across the lipid membrane. The occurrence of this water permeation is hastened at higher osmotic pressures. These results can lead to new techniques and suggest further research to provide information that may help realize an alternative and cheaper method of microalgae drying.