@article {263, title = {Antioxidant Activity and Lipoxygenase Enzyme Inhibition Assay with Total Flavonoid Content from Garcinia hombroniana Pierre Leaves}, journal = {Pharmacognosy Journal}, volume = {9}, year = {2017}, month = {February 2017}, pages = {267-272}, type = {Original Article}, chapter = {267}, abstract = {

Objective: Garcinia hombroniana Pierre leaves extract have been known to contain flavonoid, but it has not been known yet for its antioxidant activity and inhibition of lipoxygenase activity. This study aims to determine antioxidant activity and inhibition of lipoxygenase activity of G. hombroniana leaves extract. Method: Antioxidant activity tested by using FRAP (Ferric Reducing Antioxidant Power) method and inhibition of lipoxygenase activity using baicalein as the positive control. Total flavonoid assay is also quantitatively done by AlCl3 colorimetric method on the most active extract using quercetin as the positive control. Results: The test result showed that the n-hexane, ethyl acetate and methanol extract of G. hombroniana Pierre leaves have antioxidant activity which showed by EC50 value consecutively are 36.260; 2.969; and 7.416 \μg/mL, and also can inhibit lipoxygenase activity which showed by IC50 value consecutively are 2.052; 0.134; and 1.314 \μg/mL. Ethyl acetate extract of G. hombroniana Pierre leaves has the most active antioxidant activity and inhibition of lipoxygenase activity. Total flavonoid content of ethyl acetate extract of G. hombroniana Pierre leaves is 42.004 mg QE/g sample. Conclusion: Garcinia hombroniana Pierre leaves extract has antioxidant activity and can inhibit lipoxygenase activity.

}, keywords = {Antiinflammation, Antioxidant, Flavonoid, FRAP, Garcinia hombroniana Pierre, Lipoxygenase}, doi = {10.5530/pj.2017.2.45}, url = {http://phcogj.com/fulltext/312}, author = {Shinta Marlin and Berna Elya and Katrin} } @article {265, title = {Antioxidant Activity and Lipoxygenase Enzyme Inhibitory Assay with Total Flavonoids Content from Garcinia hombroniana Pierre Stem Bark Extract}, journal = {Pharmacognosy Journal}, volume = {9}, year = {2017}, month = {February 2017}, pages = {276-279}, type = {Original Article}, chapter = {276}, abstract = {

Introduction: Garcinia has been known as a rich source of xanthones, flavonoids, and phenols. The aim of this research is to obtain data of antioxidant activity and to observe potential inhibition of lipoxygenase activity that most active from methanolic, ethyl acetate and n-hexane extracts with total flavonoids content from most active extracts from the bark of Garcinia hombroniana Pierre. Methods: The antioxidant activity was measured using the ferric reducing antioxidant power (FRAP), the anti-inflammatory assay was measured using inhibition of lipoxygenase activity test, qualitative analysis of flavonoids using thin layer chromatography, and total flavonoids content was measured using AlCl3 colorimetric method. Results: The results showed that the ethyl acetate extract from G. hombroniana Pierre stem bark as the most active extract for antioxidant and lipoxygenase inhibition activity with EC50 and IC50 value consecutively 15.34 \μg /ml; 0.26 \μg /ml. Total flavonoids content of ethyl acetate is 7.430 mg QE/g extract. The results of this study showed bark extract Garcinia hombroniana Pierre has antioxidant activity and potent to inhibit lipoxygenase activity. Conclusion: Based on the research for methanolic, ethyl acetate and n-hexane extract, it can be concluded that the ethyl acetate extract of G. hombroniana Pierre as the most active extract for antioxidant and lipoxygenase inhibition activity.

}, keywords = {Antioxidant, Garcinia hombroniana Pierre, Inflammation, Lipoxygenase, Total flavonoids content}, doi = {10.5530/pj.2017.2.47}, url = {http://phcogj.com/fulltext/314}, author = {Amanda Listiyani and Berna Elya and Nuraini Puspitasari} }