02300nam a2200277 a 4500 vtls000045894 KUKTEM 20251114204534.0 100524t2009 my dao f m 000 0 eng d THE0004019(Local) 201905151228 fauzi 201107131955 VLOAD 201103301004 ida 201005241538 ida UMP TP156.E8 K43 2009 rs Bc. Khairul Anwar Mohamad Said Ultrasonic extraction of antioxidant compound in guava / Khairul Anwar B. Mohamad Said Ultrasonic extraction of antioxidant compound in guava [electronic resource] Kuantan, Pahang : UMP, 2009 vii, 59 p. : ill. (some col.) ; 30 cm. + 1 computer disc Project paper (Bachelor of Chemical Engineering) -- Universiti Malaysia Pahang - 2009 Bibliography : p. 37-42 The antioxidant such as ascorbic acid (AA) in guava juice has attracted a lot of interest from the public and herbal industries because of the antioxidant can inhibit the oxidation of body cells that can lead to health problem. The work done in this research investigates the most suitable operating parameter to extract the ascorbic acid from guava using ultrasonic extraction method. Different parameter volume of solvent which is ethanol at 30ml, 50ml, 200ml and 250ml. After determine the best solvent volume were investigated the experiments were conducted using different ultrasonic power at 150W, 200W, 250W and 300W after the determination of the best solvent volume. The sonication time was set at 20min, 30min, 50min and 60min. The extraction yields were analyzed using High Performance Liquid Chromatography system (HPLC). Result obtained revealed that 250 ml of ethanol, ultrasonic power of 300W and 20 minutes sonication time produce the highest yield of ascorbic acid. The extracted amount of ascorbic acid was 4.3150 mg/L. Therefore, these parameters can be concluded as the most optimum operating parameters in extracting ascorbic acid from guava using ultrasonic extraction method. Extraction (Chemistry) Ultrasonics Antioxidants 0 0 0 1 10000 10000 2019-09-04 0 TP156.E8 K43 2009 rs Bc. 0000042781 2019-09-04 00:00:00 1 2019-09-04 PSM 0 0 0 1 10000 10000 2019-09-04 0 CD 3918 | TP156.E8 K43 2009 rs Bc. 0000042782 2019-09-04 00:00:00 1 2019-09-04 PSM VIRTUA40 3772 3778 VTLSSORT0080*0200*0400*0900*1000*2450*2460*2600*3000*5020*5040*5200*6500*6501*6502*9992