PREPARASI DAN KARAKTERISASI NANO PARTIKEL ALUMINIUM FOSFA

PREPARASI DAN KARAKTERISASI NANO PARTIKEL ALUMINIUM FOSFAT.Telah dilakukan penelitian pembuatan nanopartikel aluminium fosfat (AlPO4) dengan disodium fosfat (Na2HPO4.7H2O), aluminium klorida (AlCl3.6H2O), dan natrium asetat (CH3COONa.3H2O) yang digunakan sebagai material utamanya. Proses preparasi dilakukan dengan memasukkan larutan aluminium klorida/natrium asetat (AlCl3.6H2O/CH3COONa.3H2O) pada konsentrasi 0,164Mke dalamlarutan disodiumfosfat dengan konsentrasi 0,144 M. Pengadukan dilakukan pada putaran rendah yaitu 40 rpm hingga 60 rpm dan berlangsung pada suhu ruang. Nanopartikel AlPO4 yang dihasilkan dikarakterisasi dengan Particle Size Analyser (PSA) untuk mengetahui ukuran partikelnya, photo microscope untuk melihat distribusi partikel pada permukaannya, dan Transmission Electron Microscope (TEM) untuk mengetahui morfologinya. Diperoleh ukuran partikel 225,9 ± 64,0 nm dengan indeks polidispersi 0,323, distribusi partikel yang merata pada permukaannya dan morfologi yang berpori. Nanopartikel AlPO4 ini berpotensi untuk digunakan sebagai adjuvan vaksin. Diharapkan penggunaannya nanti sebagai adjuvan vaksin dapat meningkatkan efektivitas terhadap vaksin yang dibutuhkan dibandingkan dengan partikel AlPO4

KARAKTERISTIK PATI BERPORI MIKRO DARI TAPIOKA HASIL PERLAKUAN AMILASE SEBAGAI AGEN PENJERAPAN MINYAK [The Characteristic of Microporous Tapioca Starch After Amylase Treatment For Oil Adsorbent Agent]

Microporous starch can be used as oil adsorbent agent. The microporous starch can be produced through partial hydrolysis at temperature below gelatinization point using amylase. On the other hand, the study of amylase produced from Indonesian sea microbe, especially Brevibacterium sp. was rarely studied. Therefore, this paper discusses the tapioca characteristic made from Brevibacterium sp. amylase (treatment A) and commercial amylase (treatment B) as oil adsorbent agent. The result showed that the yield from treatment A and B was 74.65% and 12.75% while the starch granule size was 14.60 μm and 12,59 μm. The adsorbent test showed adsorption level of oil palm were 91,08% and 142,14% while for olive oil were 94,70% and 133,17%, for treatment A and B, respectively. The morphological test showed the presence of pori on the granule surface for both treatments with FTIR assessment showed no significant change in chemical functional group for both treatments. The color analysis showed almost similar brightness level between two treatments. In the end, microporous starch of treatment A has prospect as oil adsorbent agent like the one from commercial amylas

SINTESIS DIMETIL ETER MENGGUNAKAN KATALIS Cu-Zn/γ-Al2O3 DALAM REAKTOR FIXED BED

DME dapat digunakan sebagai bahan bakar yang bebas dari sulfur untuk mesin disel tanpa pembentukan partikulat dan rendah emisi NOx jika dibandingkan dengan minyak dan gas. DME juga memiliki sifat yang sama dengan propana dan butana, senyawa pembentuk LPG, sehingga DME dapat didistribusikan dan disimpan menggunakan teknologi penanganan LPG. DME dapat digunakan sebagai pengganti LPG. Dimetil eter (DME) diproduksi secara langsung dari gas sintesis dalam reaktor fixed bed. Pada penelitian ini, Cu-Zn/γ-Al2O3 digunakan sebagai katalis bifungsi sintesis langsung dimetil eter. Pada tahap preparasi, katalis divariasikan terhadap pH dan komposisi pada metode ko-presipitasi sedimentasi, kemudian hasil terbaik dari katalis ini dilakukan perbandingan dengan katalis metode sol-gel impregnasi. Katalis ini dikarakterisasi BET, XRF, dan XRD. Uji aktivitas katalis dilakukan pada kondisi operasi tekanan 20 bar dan suhu 220oC. Hasil uji aktivitas katalis terbaik menunjukan konversi CO sebesar 70%, selektivitas dimetil eter sebesar 80%, dan yield dimetil eter sebesar 54%, yaitu pada katalis dengan metode sol-gel impregnasi yang memiliki komposisi 40:27:33

Effect of Accelerated Stability Test on Characteristics of Emulsion Systems with Chitosan as a Stabilizer

AbstractChitosan has been used as a stabilizer in the preparation of emulsion systems with Squalene as an oil phase, then Tween 80 and Span 85 as a surfactant. Water phase, oil phase and chitosan as a stabilizer stirred with a homogenizer speed of 15,000 rpm for 30 minutes. The results of accelerated stability test with extreme temperatures of 4̊C and 40̊C showed significant changes in viscosity, density and degree of stability. However, the degree of acidity was relatively still same in which closer to normal pH (6.3-6.4). The particle size analysis showed the size around 3 micrometers. This emulsion system can be applied as the media of active compound delivery, for example is the emulsion system of topical and oral preparation to overcome cellulite problem

Influence of Glucose, Urea and Bacteria Concentration On Nata De Cassava Preparation Using Liquid Tapioca Waste Medium

In this research, Nata de Cassava as the obtained bacterial cellulose was synthesized by Acetobacter xylinum using the liquid tapioca waste as the media. This research aimed to investigate the influence of concentration from carbon and nitrogen sources and then the type of bacteria used toward the obtained Nata de Cassava. The liquid tapioca waste was heated in a beaker glass at 70-80 °C and then added 5-10 % (w/v) of sugar and 0.1-0.5 % (w/v) of urea. The mixed solution was poured into a container and then cooled. Furthermore, 10-20 % (v/v) of Acetobacter xylinum was added and incubated at room temperature. After ten days, the Nata de cassava was harvested, sterilized, and immersed in ethanol, then dried in an oven at 60 °C. The results of FTIR, XRD and SEM analysis showed that Nata de Cassava had been successfully synthesized. The composition that produced the highest Nata de Cassava yield of 2.41% was the composition using 15% of A. xylinum, 10% of glucose and 0.1% of urea in the fermentation medium. In addition, the composition that produced the highest carbon conversion ratio of 26.15% was the composition that used 10% of A. xylinum, 5% of glucose and 0.2% of urea in the fermentation medium