Ekstrak kulit buah naga mengandung banyak antioksidan yang dapat menghambat radikal bebas. Penambahan ekstrak ke dalam sabun padat dapat meningkatkan aktivitas antioksidan. Penelitian ini bertujuan untuk mengetahui pengaruh komposisi ekstrak terhadap sifat sabun padat (pH dan aktivitas antioksidan). Komposisi ekstrak dan waktu reaksi bervariasi pada 1 sampai 1,5% berat dan 20 hingga 40 menit, masing-masing. Ekstrak diperoleh dengan metode maserasi diikuti dengan proses penguapan, untuk menghilangkan etanol (EtOH) yang tersisa. Sabun padat dibuat dengan mereaksikan Virgin Coconut Oil (VCO) dengan natrium hidroksida (NaOH) dan beberapa aditif. Sabun padat diproses dengan metode saponifikasi proses panas. Hasil penelitian menunjukkan bahwa sabun padat mengandung pH 8,29 – 10 dan aktivitas antioksidan dalam konsentrasi penghambatan (IC50) dengan nilai 215,27 - 1671,33 ppm. Ini menunjukkan bahwa sabun padat dengan waktu saponifikasi 20 menit dengan ekstrak 1,5% berat memiliki hasil terbaik sesuai dengan SNI 3532: 2016.
Abstract.Copper nanowires (CuNWs) for different synthesis temperatures were prepared by solution-grown method. The surface morphology and electrical resistance of CuNWs were investigated. The surface morphology analysis describes the synthesis of long (> 20μm), thin (< 60 nm), and mono-dispersed CuNWs. Thus, in the case of temperature treatment from 4 °C to 80 °C in water based solution, the CuNWs has diameter of about 71 nm, length up to 37 μm and electrical resistance (R) at 0.1 Ω. This study suggests that the as-prepared copper nanowires (CuNWs) with diameter and electrical resistance tunability might be utilized as flexible transparent conducting electrode.
This research aims to know the effects of extract composition on the solid soap properties (i.e. pH and hardness). The extract composition and reaction time were varied at 1 to 1.5 wt.% and 20 to 40 minutes, respectively. The red dragon fruit peels (Hylocereus polyrhizus) extract was obtained by maceration method followed by evaporation process, in order to remove the remaining ethanol (EtOH). The solid soap is made by reacting Virgin Coconut Oil (VCO) with sodium hydroxide (NaOH) and several additives. The results showed that the prepared solid soaps contain pH (8.29 – 10), hardness (55.763 – 380.167 mm/s). It indicates that solid soap with reaction time 20 minutes with 1.5 wt.% extract has the best stability among all the formed soaps.
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