About the Authors

Irfan Shah

Affiliation School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia

Rohana Adnan

r_adnan@usm.my

Affiliation School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia

Wan Saime Wan Ngah

Affiliation School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia

Norita Mohamed

Affiliation School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: IS RA. Performed the experiments: IS. Analyzed the data: IS RA WSWN NM. Contributed reagents/materials/analysis tools: IS RA. Wrote the paper: IS RA WSWN NM.