Gold nanoparticles were synthesized using teak leaf water extract modified with Mercaptopropionic Acid (MPA). The observations for 6 days using UV-Vis spectroscopy, obtained stable gold nanoparticles which were characterized by the maximum wavelength absorption produced in the range of 538.5 nm - 541 nm.

This study aims to extract Buni Fruit obtained from Moncongloe, Maros district, South Sulawesi, Indonesia, using Ultrasound-Assisted Extraction technology with ethanol as solvent. The effect of extraction temperature on the Total Phenolic Content and Antioxidant Activities of the extract was also studied. The result shows that at the temperature of 50 o C was obtained the best extract with the Total Phenolic Content of 6.7415 ± 0.0721 mg/g in GAE and the value of IC 50 of 29.9618 ± 1.9521 mg/L. This result shows that Buni fruit extract has the potential to be developed as a healthy food.

No abstract

Buni Fruit Water was extracted with methanol solvent using Ultrasound technology at a temperature of 50°C for 45 minutes. Total Phenolic Content contained in the methanol extract of buni fruits water is 67 mg / g in GAE. The results of interpretation using GCMS obtained three phenolic compounds, namely 3-(Hydrazinomethyl) Phenol, 5 Allyl-2 Methoxy Phenol and 3 (3,5-di-Tertier Butyl, 4-Hydroxyphenyl) Propionic Acid. IR Spectrum analysis results obtained aromatic and OH group as a marker of the presence of phenolic compounds. These results indicate that the Buni fruit water can be developed as functional food.

Abstrak- Koloid dan padatan total tersuspensi (TSS) dalam air dapat dihilangkan dengan proses koagulasi dan flokulasi. Konsentrasi koagulan dan pH merupakan dua parameter terpenting dalam keberhasilan proses koagulasi dan flokulasi. Tujuan dari penelitian ini adalah optimasi pH proses koagulasi dan flokulasi menggunakan campuran koagulan Alum dan PAC (1:1) untuk menghilangkan TSS air sungai Tello. Sampel yang digunakan dari penelitian ini adalah Air Sungai Tello yang memiliki konsentrasi TSS awal 195 mg/L. Konsentrasi campuran koagulan Alum dan PAC (1:1) yang digunakan sebesar 25% dari konsentrasi TSS awal sampel. Kondisi proses koagulasi dan flokulasi yang digunakan adalah pengadukan cepat (koagulasi) dengan kecepatan pengadukan 350 rpm selama 1 menit, pengadukan lambat (flokulasi) dengan kecepatan pengadukan 50 rpm selama 20 menit, dan pengendapan selama 30 menit. Proses koagulasi dan flokulasi dilakukan pada kisaran pH 4-10 dan konsentrasi TSS dianalisa menggunakan metode Gravimetri. pH proses koagulasi dan flokulasi dan persen (%) removal TSS optimal pada pH 6 dengan persen (%) removal TSS sebesar 98,20%. Kata kunci: Alum, Koagulasi, PAC, pH, TSS