Daun kersen (Muntingia calabura L.) diketahui mengandung beberapa senyawa yang memiliki aktivitas sebagai antibakteri terhadap Staphylococcus aureus, salah satunya adalah flavonoid. Flavonoid bekerja sebagai antibakteri dengan beberapa mekanisme aksi, diantaranya menghambat sintesis asam nukleat, menghambat fungsi membran sitoplasma dan menghambat metabolisme energi dari bakteri. Hasil penelitian ini diharapkan dapat mengetahui kadar bunuh minimum (KBM) ekstrak dan fraksi daun kersen terhadap S. aureus, untuk mengetahui aktivitas antibakteri yang paling besar dari ekstrak etanol dan masing-masing fraksi serta korelasi antara aktivitas antibakteri dengan kandungan flavonoid total. Serbuk sampel kering dimaserasi dengan etanol 96%. Ekstrak etanol dipartisi dengan fraksinasi cair-cair secara berturut-turut menggunakan heksan, etil asetat, dan air. Ekstrak etanol dan masing-masing fraksi kemudian diuji aktivitas antibakterinya terhadap S. aureus dengan metode dilusi menggunakan media Mueller Hinton Broth (MHB) pada konsentrasi 20 mg/mL, 15 mg/mL, 10 mg/mL, dan 5 mg/mL. Sebagai kontrol pembanding digunakan antibiotik Seftazidim, pelarut DMSO, dan media MHB. Kuersetin digunakan sebagai standar pembanding dalam mengukur kandungan flavonoid total menggunakan Spektrofotometer UV-Vis. Analisis hasil dilakukan dengan membandingkan kadar flavonoid total dari ekstrak etanol dan masing-masing fraksi dengan KBM. Hasil penelitian menunjukkan bahwa fraksi etil asetat merupakan fraksi yang paling aktif dengan KBM 0,312 mg/mL, sekaligus sebagai fraksi yang memiliki kadar flavonoid total paling besar yaitu sebesar 5,624 % QE. Analisis korelasi Pearson menunjukkan aktivitas antibakteri dari ekstrak etanol dan masing-masing fraksi, 93% dipengaruhi oleh kandungan flavonoid total.

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Piper betle var. nigra is a tropical plant closely related to the common piper. P. betle has also been dubbed a promising source of natural antioxidants in herbal health products, antibacterial, antifungal, antimalarial, cytotoxic activity against the cancer cell lines K562 and HL-60, and antileishmanial. The aim of this study to observation Antimicrobial activity and isolation of chemical compound. The antimicrobial activity of P. betle extract was performed by well diffusion method against two oral pathogenic bacteria (Streptococcus mutans and Streptococcus sanguinis) and opportunistic pathogenic yeast (Candida albicans). The inoculum (bacterial and yeast suspension) was prepared from a 24-h culture on NB for bacterial suspension and on TSB for yeast suspension. Extraction and isolation using various method of chromatography. Isolated compounds were characterized by spectroscopic means. Our study showed antimicrobial activity from crude ethanol extract of leaves P. betle L. var. nigra against two oral pathogenic bacteria and opportunistic pathogenic yeast with concentration 0.5% and 1%. The first report of two new amides derivatives, piperenamide A (1) and piperenamide B (2) in P. betle L. var. nigra.

Traditionally, some People from bangka belitung has consumed Eriocaulon cinereum R.Br as an anticancer drug. Aims of this study is to determine the potential of cytotoxicity of Fraction of Ethyl Acetate and Dichlorometane against T47D cell. Fractionation using Vacuum Liquid Chromatography (VLC) method. MTT assay method was used on evaluating the citotoxic activity. The fraction of dichloromethane performed high activity as a chemopreventive agent with IC50 score was 131,921 µg/ml to T47D and 413,042 µg/ml cells to vero cell whereas for ethyl acetate fraction performed lower activity as chemopreventive agent with IC50 score was 531,808 µg/ml to T47D and 679,114 µg/ml to vero cell). Phytochemical tests showed that the dichloromethane fraction contains phenolic, steroid and terpenoid compounds. While ethyl acetate fraction contains alkaloids, flavonoids and terpenoids. These compounds have activity on cancer cells through apoptotic mechanisms. The results showed the excellent potential of this plant in killing breast cancer cells.