Wedelolactone has a wide range of biological activities and used for the-treatment of various ailment. In the present study an experiment of isolation method of wedelolactone from Eclipta alba L. Hassk plant has been developed by conventional process using maceration method, partitions, and column chromatography and the result was characterized by NMR, UV- Vis and mass spectroscopy. The experimental results showed that the process of isolation isproduce wedelolactone with94% purity which are expected to be used as a standard.
NTC (Negative Temperature Coefficient) thermistors are widely used as temperature sensors in industrial and medical applications due to their high-temperature sensitivity, durability, and low cost. Generally, NTC thermistors are made from spinel structured ceramics formed by transition metal oxides with the general formula AB2O4. One of the spinel structured ceramics that can be made for NTC thermistors is NiFe2O4 nanoparticles. This work aimed to prepare Cu-Mn co-doped NiFe2O4 based thick ceramic film using Jarosite mineral as a precursor. The synthesis method used was a simple coprecipitation method, while the technique used in making a thick ceramic film was a simple screen printing technique. The sintering temperatures used were 1000 °C, 1100 °C, and 1200 °C. Based on x-ray diffraction analysis, the thick films consist of spinel phase, hematite phase, and some unidentified phase. The constant thermistor values (B) for thick films obtained with 1000, 1100, and 1200 °C sintering temperatures were 4740 K, 5669 K, and 5731 K, respectively. These results showed that all obtained thick films had passed the minimum value in market needs (B ≥2000 K).
Methylene blue dyes are widely used in textile, batik, plastic, paper, and many other industries. The remain of methylene blue dyes in the textile waste is hazardous for health and the environment. Therefore, it takes effort to deal with it. One of the efforts is the process of adsorption using adsorbents. In this study, the adsorbent ZrSiO4/Fe2O3 was synthesized using the coprecipitation method using NaOH as precipitant. Either ZrSiO4 or Fe2O3 was synthesized from Indonesia mineral local zircon sand and jarosites, respectively. The composites of ZrSiO4/Fe2O3 were prepared in %mole variation, which is 75:25; 50:50; and 25:75. All obtained composites were then characterized using X-Ray Diffraction (XRD). The XRD analysis showed that the crystal structure formed was tetragonal for ZrSiO4 and hexagonal for Fe2O3 (also known as α-Fe2O3). Evaluation toward isotherm adsorption and kinetic adsorption showed that the adsorption of MB using ZrSiO4/Fe2O3 follows the Langmuir isotherm model and pseudo-second-order model, respectively.
Abstract In this research, acombination biopesticide, a combination biopesticide from Tephrosia vogelii leaves and Cymbopogon nardus leaves has been made as an exterminator of golden snail in rice plants. The golden snail is one of the plant pest organism in rice plants which are capable of damaging plant in a short time. This study aim to determine the efficacy of a combination biopesticide of a mixture of T. vogelii leaves extract, C nardus leaves and kitosan as golden snail pest exterminators in rice plants. Three types of variance were used, namely formula I (1:1:1), II (1:2:1) and III (2:1:1) from the mixture of T. vogelii leaves extract, C nardus leaves powder and chitosan. From the test results obtained the fastest inial death time were formulation I (24.49 hours), LC50 of 10,60 g/kg which mildly toxic, 100 % daily mortaly in formulation III (day 5) and the fastest efficacy in formulation III were 38.89 % (day 2). Keywords : Golden snail, combinations biopesticide, Tephrosia vogelii, cymbopogon nardus and chitosan Abstrak Pada penelitian ini telah dilakukan pembuatan biopestisida kombinasi dari daun kacang babi, daun serai wangi dan kitosan sebagai pembasmi keong mas pada tanaman padi. Keong mas merupakan salah satu organisme pengganggu tumbuhan pada tanaman padi yang mampu merusak tanaman dalam waktu cepat. Penelitian ini bertujuan untuk mengetahui efikasi biopestisida kombinasi dari campuran ekstrak daun kacang babi, daun serai wangi dan kitosan sebagai pembasmi hama keong mas pada tanaman padi. Digunakan tiga jenis variansi yaitu formula I (1:1:1), II (1:2:1) dan III (2:1:1) dari campuran ekstrak daun kacang babi , serbuk daun serai wangi dan kitosan. Dari hasil pengujian diperoleh waktu awal kematian tercepat yaitu formula I (24,49 jam), LC50 sebesar 10,60 g/kg yang bersifat tosik ringan, mortalitas harian 100 % pada formula III (hari ke-5) dan rfikasi tercepat pada formula III yaitu 38,89 %(hari ke-2). Kata kunci : Keong mas, biopestisida kombinasi, kacang babi, serai wangi dan kitosan
Albumin digunakanan untuk mengatasi kondisi hipoalbumimenia pada berbagai penyakit. Pemanfaatan bahan baku albumin dari darah hasil donor yang sudah melebihi batas waktu penggunaan dapat memberi manfaat, yaitu mengurangi ketergantungan terhadap albumin impor dan dapat mengurangi biaya pengolahan darah limbah. Kemurnian dan perolehan albumin dapat dipengaruhi oleh berbagai parameter diantaranya; suhu, pH dan konsentrasi etanol. Pada penelitian ini dilakukan proses optimasi menggunakan metode Simplex Lattice Design agar diperoleh komposisi variasi parameter yang optimal dari 7 (tujuh) komposisi variasi parameter untuk mendapatkan albumin dengan kadar yang cukup tinggi. Albumin dipisahkan berdasarkan metode fraksinasi etanol melalui perbedaan kelarutan protein dalam plasma. Berdasarkan uji anava, ke-7 (tujuh) komposisi variasi parameter yang dibuat menunjukkan perbedaan yang nyata dengan p = 0,0282 (< 0,05) dan Fhitung > Ftabel. Hasil evaluasi menunjukkan bahwa komposisi formula ke-5 (lima) menunjukkan respon albumin optimal dengan parameter suhu -10 ℃, pH 4,8 dan konsentrasi etanol 40%. Kadar albumin yang diperoleh dengan komposisi tersebut yaitu 53,59 µg.
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