Ditemukan 2 dokumen yang sesuai dengan query
Vanida Chairgulprasert
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ABSTRAK
Reduction of free fatty acid (FFA) in used palm oil was determined after treatment of waste cooking oil with an adsorbent derived from coffee bean husk ash. Coffee husks were burned at 600 ºC for 12 hrs to obtain the adsorbent ash. Free fatty acid removal efficiency was optimized with respect to ash dosage, contact time and temperature. It was found that shaking ash (1 g) with waste palm oil (50 g) at 250 rpm ...
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Pathum Thani: Thammasat University, 2018
607 STA 23:3 (2018)
Artikel Jurnal Universitas Indonesia Library
Vanida Chairgulprasert
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The Robusta coffee flowers were analyzed for phytochemical composition and antioxidant activity. Flower powders at three different stages were extracted successively with hexane, dichloromethane and methanol, resulting in the extracts of varying yields (1.61-16.01%). All crude extracts were constituted of flavonoids, terpenoids and alkaloids. The methanol crude extracts exhibited the best antioxidant activity on both DPPH (EC50 0.03-0.13 mg/mL) and reducing power (EC50 0.19-0.46 mg/mL). It also contained the highest amount of total phenols (28.32-139.88 ...
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Prince of Songkla University. Faculty of Science and Technology, 2017
500 TIJST 22:1 (2017)
Artikel Jurnal Universitas Indonesia Library
