title: Bioassay-guided fractionation of Melastoma malabathricum Linn. leaf solid phase extraction fraction and its anticoagulant activity.
abstract: The aims of this study were to examine the bioactive component(s) responsible for the anticoagulant activity of M. malabathricum Linn. leaf hot water crude extract via bioassay-guided fractionation and to evaluate the effect of bioactive component(s) on the intrinsic blood coagulation pathway. The active anticoagulant fraction of F3 was subjected to a series of chromatographic separation and spectroscopic analyses. Furthermore, the effect of the bioactive component(s) on the intrinsic blood coagulation pathway was studied through immediate and time incubation mixing studies. Through Activated Partial Thromboplastin Time (APTT) assay-guided fractionation, Subfraction B was considered the most potent anticoagulant fraction. Characterisation of Subfraction B indicated that anticoagulant activity could partly be due to the presence of cinnamic acid and a cinnamic acid derivative. APTT assays for both the immediate and time incubation mixing were corrected back into normal clotting time range (35.4-56.3 s). In conclusion, cinnamic acid and cinnamic acid derivative from Subfraction B were the first such compounds to be discovered from M. malabathricum Linn. leaf hot water crude extract that possess anticoagulant activity. This active anticoagulant Subfraction B prolonged blood clotting time by causing factor(s) deficiency in the intrinsic blood coagulation pathway.
authors.affiliation: Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia. litengkhoo@gmail.com.
authors.forename: Li Teng
authors.initials: LT
authors.lastname: Khoo
authors.affiliation: Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia. janna@upm.edu.my.
authors.forename: Janna Ong
authors.initials: JO
authors.lastname: Abdullah
authors.affiliation: Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia. faridah_abas@upm.edu.my.|Institute of Biosciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia. faridah_abas@upm.edu.my.
authors.forename: Faridah
authors.initials: F
authors.lastname: Abas
authors.affiliation: Department of Pathology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia. eusni@upm.edu.my.
authors.forename: Eusni Rahayu Mohd
authors.initials: ER
authors.lastname: Tohit
authors.affiliation: Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia. muhajir@upm.edu.my.|Institute of Biosciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia. muhajir@upm.edu.my.
authors.forename: Muhajir
authors.initials: M
authors.lastname: Hamid
mesh_terms: D000925:Anticoagulants / Q000494:pharmacology*; D001681:Biological Assay / Q000379:methods*; D001777:Blood Coagulation / Q000187:drug effects*; D005591:Chemical Fractionation; D006801:Humans; D035322:Melastomataceae / Q000737:chemistry*; D010314:Partial Thromboplastin Time; D010936:Plant Extracts / Q000494:pharmacology*; D018515:Plant Leaves / Q000737:chemistry*; D052616:Solid Phase Extraction
chemical_list: D000925:Anticoagulants; D010936:Plant Extracts