Tun Tedja Irawadi

Effect temperature of supercritical CO2 fluid extraction on phytochemical analysis and antioxidant activity of Zingiber officinale Roscoe

Supercritical fluid extraction of Zingiber officinale Roscoe has been carried out at a pressure of 16 MPa, with temperatures between 20-40 °C, during extraction time of 6 hours and the flow rate of CO2 fluid 5.5 ml/min. The result of supercritical method was compared with the extraction maceration using a mixture of water and ethanol (70% v/v) for 24 hours. The main content in ginger that has a main role as an antioxidant is a gingerol compound that can help neutralize the damaging effects caused by free radicals in the body, as anti-coagulant, and inhibit the occurrence of blood clots. This study aims to determine the effect of temperature on chemical components contained in rough extract of Zingiber officinale Roscoe and its antioxidant activity, total phenol and total flavonoid content. To determine the chemical components contained in the crude extract of Zingiber officinale Roscoe extracted by supercritical fluid and maceration extraction, GC-MS analysis was performed. Meanwhile, the antioxidant acti...

PEMODELAN STATISTICAL CONTROL DETECTION ADAPTIVE (SCDA) UNTUK MONITORING DAN PREDIKSI VOLUME PRODUKSI CRUDE PALM OIL (CPO) NASIONAL

Achievement of national palm oil industry as a producer and exporter of crude palm oil (CPO) in the world, it is now giving birth insecurity issues. This is because the growth of upstream and downstream industries of national palm oil that has not been balanced, which in turn encourages the national palm oil industry players to be oriented to the export of CPO which eliminates the added value in the country. On the other hand, though bring in foreign exchange for the country, but is prone commodity export orientation encountered a barriers problem in the international market. It is therefore important to provide a means of monitoring, prediction and assessment to facilitate the formulation of policies more about the marketing of national CPO industry. This research proposed the development of a model framework called adaptive threshold statistical control detection adaptive (SCDA) as a means of monitoring, prediction, and assessment of the movement of national CPO production volume. SCDA idea is to determine the dynamic threshold based mapping pattern historical data and predictions from the aspect of the frequency and trends. SCDA model adapted the techniques of statistical process control (SPC), while the values of the predictions generated from the simulation prediction model developed using the techniques of artificial neural network back propagation (ANN-BP) based on historical data of the national CPO production volume. The data used was the average volume of annual national CPO production period 1967 to 2015. The simulation results showed that the prediction model of national CPO production volume in 2016 until 2018 predicted were31.025 million, 32.214 million, and 34.504 million tons, respectively, while the values of maximum and minimum threshold that was formed in the model predictions SCDA for the period 2016-2018 each sequence were 33,322,065 and 29,246,547, respectively. As far as the literature search results, modeling SCDA has never been done in the research included for monitoring and prediction of national production volume of CPO. Therefore, research on the modeling of SCDA was contributing both to the development of knowledge about modeling as well as in the management of the national supply of CPO. Keywords: adaptive threshold, modelling, artificial neural network, palm oil

The Influence of Process Energy on the Yield of Asymmetric Curcumin Analog from Cullilawan Oil

Asymmetric curcumin analogue compound is an anticancer compound synthesized from cullilawan oil with several stages of the process such as; Isolation of safrol from cullilawan oil, safol isomerisation, oxidation, intermediate product synthesis and asymmetric curcumin analog synthesis. The amount of energy used for asymmetric curcumin analog synthesis process gives effect to yield. The purpose of this research is to know the effect of process energy on asymmetric curcumin analogue yield from lawang oil. The results of the study showed that the synthesis of curcumin analogue compounds using microwave method on different energy quantities (8.4kJ, 25.2 kJ, 33.6 kJ, 75 kJ) gives effect to yield. The greater the energy used in the process will lower the yield and the energy that gives the highest yield is 8.4 kJ.

Effect of Corn Hominy and Polyvinyl Alcohol on Mechanical Properties of Cassava Starch-Baked Foam

Agromaterials such as starch and fiber are very promising raw materials to reduce our dependence on polystyrene. Corn hominy, a by-product of the corn milling industry, is a potential source to reinforce starch-baked foam. The effects of corn hominy and PVOH addition on mechanical properties of Cassava starch foam were investigated. Different formulations of Cassava starch, corn hominy and PVOH were mixed with liquid to get total solids at 50% and baked in a thermopressing machine at 150–170°C for 2 min. The results showed that corn hominy and PVOH addition can improve compressibility and tensile strength of the foams but gave denser foam and darker color. Ratio of tapioca: corn hominy: PVOH = (75:25):30% gave the best foam properties. GRAPHICAL ABSTRACT

SINTESIS PATI JAGUNG TERFOSFORILASI MELALUI TEKNIK GELOMBANG MIKRO

SINTESIS PATI JAGUNG TERFOSFORILASI MELALUI TEKNIK GELOMBANG MIKRO [Microwave-Assisted Synthesis of Phosphorylated Corn Starch ] Atep Dian Supardan*, Suminar Setiati Achmadi dan Tun Tedja Irawadi Departemen Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Institut Pertanian Bogor, Bogor Diterima 28 Maret 2013 / Disetujui 24 Februari 2014 ABSTRACT Phosphorylated starch is a type of modified starches which is most ly imported. Commonly, starch to be modified must contain more than 25% of amylose. This study aimed to synthesize phosphorylated starch and evaluate its potency as a heavy metal adsorbent. Corn starch was subjected to phosphorylation through microwave-assisted reaction with a mixture of sodium dihydrogen orthophosphate and disodium hydrogen phosphate. The experiment was designed to optimize the pH, microwave radiation power, and phosphorylation time. The results showed that the maximum phosphate subtitution degree was obtained at pH of 6, microwave radiation of 500 W, and a reaction time of 10 minutes. The degree of subtitution ranged from 0.567 to 0.787. The physicochemical properties of the product i.e. swelling capacity, solubility, water binding capacity, and paste clarity were significantl y different than that of the unmodified corn starch. The infrared spectrum showed a high peak absorption at the wavelength of 1651 cm -1 , indicating hydrogen bond formation of phosphoric group-water- phosphoric group. In the fingerprint area, there were two new absorption peaks at 12 00 and 99 0 cm -1 , which were assigned for the P = O and C-O-P vibrations, respectively. The phosphorylated corn starch adsorbed methylene blue up to 73.3% and mercury up to 73.6%, suggesting the prospect of the microwave - assisted synthetic phosphorylated corn starch as an effective adsorbent for heavy metals.

SINTESIS PATI JAGUNG TERFOSFORILASI MELALUI TEKNIK GELOMBANG MIKRO (Microwave-Assisted Synthesis of Phosphorylated Corn Starch)

SINTESIS PATI JAGUNG TERFOSFORILASI MELALUI TEKNIK GELOMBANG MIKRO [Microwave-Assisted Synthesis of Phosphorylated Corn Starch ] Atep Dian Supardan*, Suminar Setiati Achmadi dan Tun Tedja Irawadi Departemen Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Institut Pertanian Bogor, Bogor Diterima 28 Maret 2013 / Disetujui 24 Februari 2014 ABSTRACT Phosphorylated starch is a type of modified starches which is most ly imported. Commonly, starch to be modified must contain more than 25% of amylose. This study aimed to synthesize phosphorylated starch and evaluate its potency as a heavy metal adsorbent. Corn starch was subjected to phosphorylation through microwave-assisted reaction with a mixture of sodium dihydrogen orthophosphate and disodium hydrogen phosphate. The experiment was designed to optimize the pH, microwave radiation power, and phosphorylation time. The results showed that the maximum phosphate subtitution degree was obtained at pH of 6, microwave radiation of 500 W, and a reaction time of 10 minutes. The degree of subtitution ranged from 0.567 to 0.787. The physicochemical properties of the product i.e. swelling capacity, solubility, water binding capacity, and paste clarity were significantl y different than that of the unmodified corn starch. The infrared spectrum showed a high peak absorption at the wavelength of 1651 cm -1 , indicating hydrogen bond formation of phosphoric group-water- phosphoric group. In the fingerprint area, there were two new absorption peaks at 12 00 and 99 0 cm -1 , which were assigned for the P = O and C-O-P vibrations, respectively. The phosphorylated corn starch adsorbed methylene blue up to 73.3% and mercury up to 73.6%, suggesting the prospect of the microwave - assisted synthetic phosphorylated corn starch as an effective adsorbent for heavy metals.