@article {262, title = {Chemical Characterization and Evaluation of Antioxidant and Antimicrobial Activities of Litchi chinensis Sonn.}, journal = {Pharmacognosy Research}, volume = {11}, year = {2019}, month = {February,2019}, pages = {1-7}, type = {Original Article}, chapter = {1}, abstract = {

Background: Litchi chinensis is used in traditional Chinese medicine and by Indian medical system. Ethnopharmacological studies show anti-inflammatory, antidiabetic and analgesic activities, among others. However, there are few studies of antimicrobial activity. This study evaluates antimicrobial, antioxidant, and cytotoxicity properties of the lychee{\textquoteright}s leaves extract (LE) and fractions. Materials and Methods: Extracts were obtained using an exhaustive extraction method with ethanol: Water (7:3 v/v). Subsequently, LE was concentrated in a rotary evaporator. Finally, LE was dried via lyophilization. Fractions were obtained via the partition process. Bioactivity of the LE and fractions (hexane [Hex], ethyl acetate [EtOAc], n-butanol [BuOH], and aqueous [Aq]) from L. chinensis was evaluated through antimicrobial activity using broth microdilution, antioxidant activity via both 1,1-diphenyl-2-picryl-hidrazila assay and ferric reducing capacity and cytotoxicity through 3-(4,5-dimethyl-thiazol-2-yl)-2,5-diphenyltetrazolium bromide reduction assay. Furthermore, mass spectrometry technique electrospray ionization ion trap mass spectrometry was used to identify the chemical composition of the LE and fractions. Results: Phenolic compounds, such as flavonoids and condensed tannins were the main substances found. Total phenolic and flavonoid contents were higher in EtOAc (541.15 {\textpm} 2.4 mg/g and 31.06 {\textpm} 0.5 mg/g, respectively). This fraction showed the best results for antioxidant activity (IC50 = 3.45 mg/mL) and ferric reducing capacity (20.27\% {\textpm} 0.11). The LE and fractions showed considerable antimicrobial activity, chiefly against Bacillus subtilis, Bacillus cereus, Staphylococcus aureus, and Proteus mirabilis, with the minimum inhibitory concentration ranging from 50 to 1560 μg/ml. Conclusion: This study revealed that L. chinensis is a source of bioactive compounds potentially useful for pharmaceutical and food industries.

}, keywords = {Antimicrobial activity, Antioxidant activity, Medicinal plants, Phenolic compounds, Phytochemical screening.}, doi = {10.4103/pr.pr_105_18}, author = {Marisa De Oliveira Lopes and Ana Fl{\'a}via Da Silva and Cl{\'a}udio Daniel Cerdeira and Ingridy Simone Ribeiro and Isael Aparecido Rosa and Luis Felipe Cunha Dos Reis and Marcelo Aparecido Da Silva and Marcos Jos{\'e} Marques and Jorge Kleber Chavasco} }