Natural Science: Journal of Science and Technology 

About: Natural Science: Journal of Science and Technology is an academic journal. The journal publishes majorly in the area(s): Callus & Explant culture. It has an ISSN identifier of 2338-0950. It is also open access. Over the lifetime, 180 publications have been published receiving 429 citations. The journal is also known as: Journal of Science and Technology & Journal of science and technology.

Kajian penggunaan arang aktif tongkol jagung sebagai adsorben logam pb dengan beberapa aktivator asam

Abstract: Research on the activated charcoal, by some acid activators, as an Pb adsorbent has been done. Corncobs as agricultural waste having a huge potential as a material in activated charcoal. It because of easily to be obtained, but also it is containing high levels of elemental carbon (43.42 %) and hydrogen (6.32 %) which calorific value ranging between 14.7 - 18.9 MJ/kg. This study aimed to determine the effect of acid activation on waste corncobs and the levle of lead (II) absorption. Corncob charcoal were activated by soaked for 24 hours in nitric acid and hydrochloric acid. The results showed that the absorption of iodine on activated charcoal by hydrochloric acid (HCl) was 773.85 mg/g , by sulfuric acid (H 2 SO 4 ) was 665.76 mg/g and by nitric acid (HNO 3 ) was 637.82 mg/g. Charcoal of 14 g had the best absorption (0.508 ppm) compare to other treatments. The best absorption capacity (23.80 % ) was found in 12 grams of charcoal.

Induksi Kalus Tanaman Kakao (Theobroma cacao L.) Pada Media MS Dengan Penambahan 2,4-D, BAP Dan Air Kelapa

Abstract: Study on callus induction of cacao ( Theobroma cacao L . ) was conducted at the Tissue Culture laboratory, Forestry faculty, Tadulako University, Palu, during periode of January until April 2012. This research was aimed to obtain the best medium formulation for induction and growth of cacao callus. Calli was induced from embryo on MS based medium containing of 2,4-D, BAP and coconut water. The intact plant as explant was taken from Local Farming. This experiment was arranged in completely randomized design with 4 treatments and 3 replications. The treatments were : MS medium + 2 ppm 2,4-D + 15% coconut water (N1), MS medium + 2 ppm 2,4-D + 0,2 ppm BAP, 15% coconut water (N2), MS medium + 2 ppm 2,4-D + 0,2 ppm BAP (N3), and MS medium + 2 ppm 2,4-D (N4). Parameters observed in this study were the days appear of callus, percentage of explant producing callus (%), also observation on morphology and the cell of callus. The best medium for callus induction was MS medium + 2 ppm 2,4-D + 15% coconut water (N1). This medium produces healthy-compac callus which active in cell proliferation, in 6 days after induction.

Formulasi krim antioksidan ekstrak etanol bawang hutan (eleutherine palmifolia l. merr)

Abstract: Eleutherine palmifolia L. Merr having antioxidant activity, its because of contain flavonoid, fenolat and tanin. These compounds have effect in preventing of free radical which cause premature aging. Research on ethanol extract of E. palmifolia L. Merr which formulated into antioxidant cream have been done by applying variation of TEA emulgator and stearic acid. That variation were F1 (2% : 6%), F2 (3% : 12%) and F3 (4% : 18%). Determination of antioxidant activity was done based on DPPH methode, and the Value is 98,210%. Furthermore, evaluation on physical characteristics was done based on organoleptic test, homogenity, pH, viscosity and stability of cream preparation. Observation was done during 21 days. Obtained data were then analyze by student-t test in comparing of the value between fresh and 21 days after storage. the pH of cream F1, F2 and F3 were not showed significant decrease, while DPPH reduce percent of F1, F2 and F3 were showed significant decrease. In contrast, viscosity of cream F3 was significant decrease. Antioxydant activity extract based on DPPH reduce percent value of F1, F2, F3 at the first day were 96,822%, 97,123% and 96,896%, respectively. Whereas that value at 21nd days after storage were 89,036%, 89,726% and 90,564%, respectively. Our result showed that E. palmifolia L. Merr ethanol extract can be formulated as a cream preparations. F2 physical properties was fullfill standart quality, which it was used TEA emulgator and stearic acid proportion of 3% : 12%.

Pemanfaatan arang aktif kulit pisang kepok (musa normalis) sebagai adsorben untuk menurunkan angka peroksida dan asam lemak bebas minyak goreng bekas

Abstract: This research was about the useofactive charcoal of the banana peel ( Musa normalis ) as adsorbent to degrade peroxide and free faty acid of the used cooking oil. The aims of thisresearch was to determine the best rasio of active charcoal of the banana peel as adsorbent, and the best concentration of NaOH as activator to reduceperoxideand free faty acid of the used cooking oil. This research used 5 level oftreatmentswhich based on CRD, the ratio variation were 2.5, 5.0, 7.5, 10.0 and 12.5 % and the concentrations of NaOH variation were 0.125, 0.25, 0.5, 1 and 2 N. The result showed that the best ratio was occurred in the 10.0 % and the concentration of 1 N NaOH. This value indicated that the banana peel was an adsorben, which can be used inincrease quality of the used cooking oil.

Synthesis of Magnetite Nanoparticles Using The Reverse Co-precipitation Method With NH4OH as Precipitating Agent and Its Stability Test at Various pH

Abstract: In this study, the synthesis of magnetite was carried out through the reversed coprecipitation method with ammonium hydroxide (NH4OH) as precipitating agent. The aim of the study was to obtain the most appropriate moles ratio of Fe(III) and Fe(II) in obtaining the best characteristics of magnetite, considering that Fe (II) was easily oxidized to Fe (III). Characterization of synthesized magnetite was performed using a Fourier Transform Infrared (FTIR) spectrophotometer and X-Ray Diffraction (XRD). The results showed that the moles ratio of Fe (III) and Fe (II) that produced magnetite with high yield, FTIR spectra absorption and diffractogram peaks with high intensity was magnetite synthesized using a ratio of Fe (III) and Fe (II) = 1.5: 1. Yield of magnetite synthesized in this condition was 81%. Based on the stability test, magnetite was stable at pH 2-10.