Widyariset
Not a member yet
485 research outputs found
Sort by
DUA SESKUITERPEN MINOR DARI RIMPANG TEMU HITAM (Curcuma aeruginosa Roxb.)
No full textTemu-temuan atau tumbuhan dari genus Curcuma (Zingiberaceae) merupakan salah satu tumbuhan obat yang penting di Indonesia, terutama sebagai bahan baku jamu. Dua seskuiterpen yaitu kurzeon dan kurkumafuranol telah diisolasi dan dipurifikasi dari rimpang segar temu hitam (Curcuma aeruginosa Roxb.) dengan teknik kromatografi. Elusidasi struktur dari kedua senyawa tersebut didasarkan pada data spektrum massa (MS), inframerah (IR), 1H dan 13C NMR serta spektrum 2D-NMR. Hasil yang diperoleh dari spektrum massa yaitu dua senyawa seskuiterpen tersebut memiliki ion molekul pada m/z 228 dan 232 dengan rumus molekul masing-masing adalah C15H16O2 dan C15H20O2.
PERENGKAHAN KATALITIK CRUDE PALM OIL (CPO) MENGGUNAKAN KATALIS NI-CARBON DENGAN METODE IMPREGNASI
No full textAbstractThis research was carried out to investigate the effect of Ni metal that has been attached to activated charcoal to produce biofuel through the catalytic cracking process of Crude Palm Oil. In this research, the catalytic cracking process used a modified Ni-Carbon catalyst through the impregnation method with concentration and temperature variation. The concentration of the metal solution used was 1%, 2% and 3%, with temperature 450 ° C, 500 ° C and 550 ° C. The catalyst was analyzed and characterized by XRD and SEM-EDX, where the nickel metal yields on the Ni-Carbon catalyst to the 1%, 2%, and 3%, was 8.23%, 18.42% and 9.23%, whereas the optimal product conversion result (%) of CHP cracking of Crude Palm Oil at a catalyst concentration of 2% and a temperature of 550 ° C was 73.84%.Keywords: Impregnation, Catalytic Cracking, Crude Palm Oil abstrakTujuan penelitian ini adalah untuk mengetahui pengaruh logam Ni yang telah terembankan ke arang aktif guna membantu proses perengkahan katalitik Crude Palm Oil. Pada penelitian ini proses perengkahan katalitik menggunakan katalis modifikasi Ni-Carbon melalui metode impregnasi. Variasi yang dilakukan meliputi konsentrasi larutan logam 1%, 2% dan 3%, dan temperatur perengkahan katalitik yaitu 450°C, 500°C dan 550°C. Analisa yang dilakukan meliputi analisa XRD dan SEM-EDX pada katalis, dimana hasil logam nikel yang teremban pada katalis Ni-Carbon 1%, 2%, dan 3% yaitu sebesar 8,23%, 18,42% dan 9,23%, sedangkan pada produk didapatkan hasil konversi optimal (%) CHP perengkahan Crude Palm Oil pada konsentrasi katalis 2% dan suhu 550°C sebesar 73,84%
THE OCEAN CURRENT PATTERN AND WATER MASS CHARACTERISTIC IN THE RESPONSE OF CLIMATE EVENTS ON THE NORTHWESTERN SUMATRA WATER
No full textEl Nino lemah dan positif Indian Ocean Dipole (pIOD) yang diikuti La Nina moderat dan negatif Indian Ocean Dipole (nIOD) pada tahun 2017 memberikan pengaruhnya terhadap kondisi pantai barat laut Sumatera. Penelitian untuk menganalisis hal tersebut dilakukan menggunakan RV Baruna Jaya VIII pada Desember 2017. Pelayaran ini bertujuan menganalisis pengaruh perubahan iklim terhadap pola arus laut dan karakteristik massa air. Data hidrografi dari pelayaran tersebut didukung oleh data satelit altimetri suhu permukaan laut (SST), data anomali angin yang bersumber dari The European Centre for Medium-Range Weather Forecasts (ECMWF), dan data arus yang bersumber dari Ocean Surface Current Analysis Real-Time. Hasil penelitian menunjukkan adanya warmer sea surface temperature saat fenomena weak El Nino diikuti positive IOD (pIOD) and cooler sea surface temperature saat fenomena moderat La Nina diikuti negative IOD (nIOD). Karakteristik massa air yang diamati pada lapisan atas maupun tengah bersumber dari perairan Samudera Hindia. Data arus mendukung hal tersebut dengan menunjukkan bahwa arus pada bulan Desember bergerak dari barat sebagai bagian dari musim barat dan pengaruh dari Wyrtki Jets
Dinamika Waktu Tanam Tanaman Padi di Lahan Rawa Lebak Pulau Kalimantan
No full textLahan rawa lebak merupakan salah satu lahan yang cukup potensial untuk pengembangan pertanian. Salah satu faktor penentu kebehasilan budidaya pertanian di lahan rawa lebak adalah waktu tanam. Saat ini pergeseran waktu tanam berubah sangat dinamik di tengah perubahan iklim yang tidak menentu. Oleh karena itu, analisis tentang waktu tanam menjadi sangat penting untuk dilakukan, termasuk waktu tanam padi di sawah lahan rawa lebak. Tujuan makalah ini adalah untuk menganalisis dinamika waktu tanam padi di lahan rawa lebak Pulau Kalimantan sehubungan dengan dinamika perubahan iklim. Waktu tanam padi di sawah lahan rawa lebak Pulau Kalimantan menunjukkan dinamika yang berbeda, dimana waktu tanam dominan di Kalimantan selatan dan Timur tejadi sekitar bulan Juni-Juli, sedangkan di Kalimantan Barat dan Tengah pada bulan Oktober-November. Sawah lahan rawa lebak menunjukkan adaptasi yang baik di tengah perubahan iklim dimana waktu tanam padi hanya sedikit bergeser dalam kurun waktu 10 tahun
KEMAMPUAN TIGA ISOLAT KELOMPOK AKTINOMISET BERBEDA DALAM PRODUKSI ENZIM MANNANASE
No full textThree different species of Actinomycetes namely Streptomyces alboniger, Saccharopolyspora flava, and Streptacidiphilus lutealbus were investigated for the ability of producing mannanase enzyme. All isolates were able to hydrolyze mannan substrate differently. The mannanase activity from S. flava, S. alboniger, and S. luteualbus were 4.764; 0.110; 0.614 U/ml respectively. S. flava was also being predicted to produce sellulase and xylanase by its ability to grow in a wide range of media containing mannan, xylan, CMC, palm kernel, coconut kernel, and porang. The mannanase produced by S. flava was also maintained its activity at high temperature (50-60oC) therefore being considered as thermostable enzyme. TLC analysis revealed the occurrence of oligosaccharide as a product from substrate-enzyme reactio
SINTESIS, PENGUJIAN, DAN KARAKTERISASI HIDROGEL BERBASIS SODIUM CARBOXYMETHYL CELLULOSE DAN CHITOSAN
No full textHydrogel, as a water super absorbent polymer, has a potential to improve irrigation efficiency in agricultural land. The objective of this research was to optimize hydrogel syntheses using environmentally friendly natural polymers, including sodium carboxymethyl cellulose (NaCMC), chitosan, and citric acid. Hydrogel was synthesized using the hydrothermal method at a temperature below 100 °C and using water as the primary medium. The results of this research showed that hydrogel which was synthesized with 2% w/v of NaCMC and 5% w/w of citric acid in 10% v/v of chitosan, which was cross-linked in 80 °C for 2 hours, was able to absorb water up to 350 times of its dry weights for 30 minutes. The maximum absorption rate of the produced hydrogel was up to 55 grams per minutes and was achieved during the first 3 minutes of free absorbency test
PENGARUH VARIETAS DAN APLIKASI TEKNOLOGI BUDI DAYA TERHADAP KUALITAS UMBI BAWANG PUTIH
Full text linkGarlic demand in Indonesia currently still depends on import supply due to the low rate of production and its quality still inadequate to fulfill the consumer’s request who demand a bigger size. Therefore, the government has been developing garlic innovative cultivation technology, namely TIBBP, which expected to increase local garlic quality. This research aims to compare and identify the influence of TIBBP and farmer’s conventional cultivation technology and to compare the potential of garlic local variety, Lumbu Hijau and Tawangmangu Baru, on garlic bulb quality. This research was conducted in Tawangmangu, Karanganyar, Central Java. The result showed that TIBBP has been proven to increase garlic bulb quality compared to the farmer’s conventional technology. Tawangmangu Baru which cultivated with TIBBP has 32.69% bigger diameter and 11.5 gram heavier compared to Tawangmangu Baru which cultivated with the farmer’s conventional technology. Tawangmangu Baru proximate composition cultivated with TIBBP also showed better value compared to the farmer’s conventional technology. In general Tawangmangu Baru was also superior compared to Lumbu Hijau. This TIBBP might be disseminated and implemented broadly to increase garlic bulb quality in Indonesia
ANALISIS KANDUNGAN (AIR, ABU, DAN LOGAM BERAT) PADA KOPI BUBUK ASAL GAYO
Full text linkGayo coffee is one type of arabica coffee originating from the Gayo plateau, Central Aceh district. Where Gayo coffee has a distinctive flavor, strong aroma and taste specifically. In the Gayo coffee processing process, it is inseparable from various kinds of contamination, so analysis needs to be done. Analysis was carried out on two coffee samples taken from two factories, namely factories A and B. Analysis carried out included analysis of water, ash, and metal content of ground coffee originating from Gayo. The analysis of metal content was carried out by using Atomic Absorbtion Spectroscopy (AAS). The test results showed that coffee A had a water content of 0.0397% and ash content 4% while coffee B had a water content of 0.01772% and ash content 4.3%. The test results of heavy metal within coffee A and B revealed that the contaminants of Cu, Hg, Pb and Zn metals existed. The coffee A contained Cu and Hg metal contamination with levels of 6.4945 and 0.0029 mg/Kg respectively. While, the coffee B contained Cu and Hg metal contamination with levels of 7.6120 and 0.0042 mg/Kg, respectively. The contamination of Pb and Zn within the coffee A and B were low and insignificant (0.001 mg/Kg). From the results of the analysis, it was found that the water, ash and metal content in coffee A and coffee B complies to the Indonesian National Standards (SNI) 01-3542-2004
Optimalisasi Lateks Tetesan Lanjut Menggunakan Berbagai Koagulan Anjuran
Full text linkNatural rubber latex will coagulate naturally about 4-6 hours after tapping. This coagulation will produce low quality rubber and inconsistent. In addition, latex will be easily lost by rain because long coagulation time, especially continuous latex droplet. The use of coagulant in the continuous latex droplet can reduce yield losses and improve quality. The purposes were to identify and study the effect of coagulants on the dry rubber content and technical quality of the rubber from continuous latex droplet of clone BPM 24. The treatments was type of coagulants consist of formic acid, pure liquid smoke, liquid smoke DS, liquid smoke DK and control (auto coagulation). Each treatment use 10 rubber tree of clone BPM 24. The parameters consists of dry rubber content, initial plasticity (Po), plasticity retention index (PRI), Mooney viscosity, viscosity stability index (SVI), volatile matter content and ash content. The quality will be analyzed statistically using the completely randomized design non factorial and will be compared with Indonesian National Standard 06-1903-2000 about Standard Indonesian Rubber (SIR). The results showed that the use of coagulant to continuous latex droplet had significant effect on PRI and Mooney viscosity of rubber. The best treatment was obtained liquid smoke DS which produce rubber with quality standards for Po 36, PRI 80.8, Mooney viscosity 68, SVI 4, ash content 0.27% and volatile matter content 0.48%. The coagulated natural rubber with liquid smoke DS can produce rubber with quality specifications SIR 20 grade CV 70
Pengawetan Kayu Karet Menggunakan Asap Cair dan Ekstrak Kunyit dengan Teknik Perendaman Dingin
Full text linkRubber wood (Hevea brasiliensis) is a wood with low durability wood. In general, rubber wood is preserved by chemicals which are relatively not environmental friendly. This study was conducted to evaluate the potential of liquid smoke from pyrolysis of palm oil kernel and turmeric extract as wood preservatives. Rubber wood was soaked in 5% w/v of liquid smoke and turmeric extract, respectively for 2, 8, and 14 days which preservation was carried out for six months. Formaline and boric acids was used for comparison as well. The used parameters were preservative retention, moisture content during storage, color changes, and damage level. The results indicated that the longer the immersion, the greater the preservative retention and water content. Turmeric extract and liquid smoke provided a brownish yellow and light brown color. In general, liquid smoke for two days of immersion adequate for six months preservation whereas turmeric acid for two months