Catechin-Modified Polylactide Stereocomplex at Chain End Improved Antibiobacterial Property

Area of Science:

• Polymer Chemistry
• Materials Science
• Biomaterials

Background:

• Poly(lactide)s (PLAs) are widely used biodegradable polymers.
• Developing functionalized PLAs with antibacterial properties is crucial for biomedical applications.
• Stereocomplexation of poly(L,L-lactide) (PLLA) and poly(D,D-lactide) (PDLA) can enhance thermal properties.

Purpose of the Study:

• To synthesize PLLA and PDLA with end-chain antibacterial moieties using catechin (CT) as an initiator.
• To investigate the antibacterial efficacy of CT-conjugated PLAs against Staphylococcus aureus.
• To explore the influence of stereocomplexation on the antibacterial activity and physical interactions.

Main Methods:

• Lactide polymerization using catechin (CT) as an initiator precursor.
• Synthesis of linear PLLA and PDLA with CT conjugated at chain ends after deprotection.
• Stereocomplexation of PLLA and PDLA.
• Antibacterial property assessment via Staphylococcus aureus proliferation tests.

Main Results:

• Catechin (CT) successfully conjugated to the chain ends of PLLA and PDLA.
• CT-modified PLAs exhibited significant antibacterial properties against Staphylococcus aureus.
• Antibacterial activity was attributed to the inherent properties of the catechin moiety.
• Silver ion interaction was investigated but ions were not detected after stereocomplexation.

Conclusions:

• Catechin-initiated polymerization is an effective method for creating antibacterial PLLA and PDLA.
• The antibacterial efficacy of the modified polymers originates from the conjugated catechin.
• Stereocomplexation did not enhance or maintain antibacterial activity when silver ions were considered.