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Science and Technology Indonesia

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Published by Universitas Sriwijaya

ISSN : 25804405 EISSN : 25804391 DOI : -

Core Subject : Science, Social, Engineering,

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Environmental Science Materials Science & Nanotechnology Physics

An international Peer-review journal in the field of science and technology published by The Indonesian Science and Technology Society. Science and Technology Indonesia is a member of Crossref with DOI prefix number: 10.26554/sti. Science and Technology Indonesia publishes quarterly (January, April, July, October). Science and Technology Indonesia is an international scholarly journal on the field of science and technology aimed to publish a high-quality scientific paper including original research papers, reviews, short communication, and technical notes. This journal welcomes the submission of articles that covers a typical subject of natural science and technology such as: > Chemistry > Biology > Physics > Marine Science > Pharmacy > Chemical Engineering > Environmental Science and Engineering > Computational Engineering > Biotechnology Journal Commencement: October 2016

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Articles 5 Documents

Search results for , issue "Vol. 4 No. 1 (2019): January" : 5 Documents clear

Antioxidant Activity Analysis and Standardization of Parkia speciosa (Petai) Pods Ethanol Extract Najma Annuria Fithri; Fitrya Fitrya; Tia Shabrina; Diva Yulanri
Science and Technology Indonesia Vol. 4 No. 1 (2019): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Parkia speciosa (petai) pods are rarely used and considered as waste despite their phenolic and flavonoid content. Phenolic and flavonoid content in plants are known to exhibit antioxidant activity. Antioxidants are known to potentially act agains radical and mediate the damage by structural stabilization. This research was conducted to analyze the antioxidant potential of petai pods using DPPH method. Analysis showed the IC50 of petai pods ethanolic extract was 75.72 ppm, which indicate strong acting antioxidant. Standardization of extracts were determined to manage the quality of extract, including the analysis of density, water content, ash values, and quantification of total phenolic and flavonoid content. Research outcome indicate the extract retain its quality during storage and use which confrmed to standardization requirements of water content and ash values. Total phenolics and flavonoid obtained were 272.45 mg/gGAE and 243.2029 mg/gQE respectively. Based from this research, petai pods ethanolic extract present strong antioxidant activity which was contributed by high existing content of flavonoid and phenolic compounds.

The Effect of Rice Husk Addition as Additive Materials on the Characterization of Ceramic Membrane and Their Application on Water River Treatment Process Sisnayati Sisnayati; Ria Komala; Retno Suryani
Science and Technology Indonesia Vol. 4 No. 1 (2019): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

This study aims to study how the effect of adding rice husk additives to the characteristics of ceramic membranes with various variations of membrane-forming component composition in terms of surface morphology and pore size of the membrane produced. This research is expected to be used by the community as an alternative treatment of river water into clean water. In this study, the variables studied were the composition of the membrane constituent namely clay, iron powder and rice husk as an additives. The ceramic membrane was designed in the form of a tube, made from a mixture of clay, iron powder and rice husk with a diameter of 5 cm, an outer diameter of 6 cm, a thickness of 1 cm and a length of 25 cm. Housing membrane was made of glass fiber with an outer diameter of 9 cm, an inner diameter of 8.5 cm and a length of 30 cm. Making ceramic membranes were from clay, iron powder and rice husk with a ratio of 87.5%, 2.5%, 10%, 77.5%, 2.5%, 20% and 77.5%, 2.5%, 15%. The river water was treated by flowing to the complete separation process. It was taken every 15 minutes, 30 minutes, 45 minutes, 60 minutes, 75 minutes, 90 minutes. Every sampling, the permeate volume was determined. Permeat events were analyzed for chemical parameters in the form of iron (Fe), Manganese (Mn) and Zinc (Zn). Based on the SEM-EDS analysis on the ceramic membrane produced shows that the membrane was classified in the microfiltration membrane group with a random and asymmetrical pore size and structure. According to the BET analysis on ceramic membranes shows that the best ceramic membrane produced in this study is C ceramic membrane with a clay composition of 87.5%; 10% of rice husk; and 2.5% of iron powder with a pore size of 2.8 μm and a large surface area of 45.38 m2/g. The difference in pressure of 2 bars gives the best results in reducing levels of contaminant compounds contained in river water with a percentage of Fe reduction of 92.18%, Mn of 89.23%, and Zn of 99.80%.

Effect of Dilute Acid - Alkaline Pretreatment on Rice Husk Composition and Hydrodynamic Modeling with CFD Novia Novia; Vishnu K Pareek; Hermansyah Hermansyah; Asyeni Miftahul Jannah
Science and Technology Indonesia Vol. 4 No. 1 (2019): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

The high cellulosic content of rice husk can be utilized as a feedstock for pulp and biofuel. Pretreatment is necessary to break the bonds in the complex lignocellulose matrices addressing the cellulose access. This work aims to utilize the rice husk using dilute acid and alkaline pretreatment experimentally and CFD modeling. The study consists of three series of research. The first stage was the dilute acid pretreatment with sulfuric acid concentration of 1% to 5% (v/v) at 85°C for 60 minutes, and alkaline pretreatment with NaOH concentration of 1% to 5% (w/v) at 85oC for 30 minutes separately. The second stage used the combination of both pretreatment. Moreover the last stage of research was hydrodynamic modeling of pretreatment process by CFD (ANSYS FLUENT 16). The experimental results showed that the lowest lignin content after acid pretreatment was about 10.74%. Alkaline pretreatment produced the lowest lignin content of 4.35%. The highest cellulose content was 66.75 % for acid-alkaline pretreatment. The lowest content of lignin was about 6.09% for acid-alkaline pretreatment. The lowest performance of alkaline pretreatment on HWS (hot water solubility) of about 7.34% can be enhanced to 9.71% by using a combination alkaline-acid. The combined pretreatments result hemicellulose of about 9.59% (alkaline-acid) and 9.27% (acid-alkaline). Modeling results showed that the mixing area had the minimum pressure of about -6250 Pa which is vortex leading minimum efficiency of mixing. The rice husk flowed upward to the upper level and mixed with reagent in the perfect mixing.

Antihyperlipidemic Activity of Ethanol Extract Mindi’s Leaves (Melia azedarach Linn.) in Male Wistar Rats Induced Propiltiouracil Herlina Herlina; Budi Untari; Indah Solihah; Merie Santia
Science and Technology Indonesia Vol. 4 No. 1 (2019): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Mindi’s leaves (Melia azedarach Linn.) is an Indonesian medicinal plant that used as traditional medicine. Mindi leaves contains some secondary metabolites which have potency to decreased total cholesterol and LDL level. The study purposed to know antihyperlipidemic effect of ethanol extract of mindi’s leaves (Melia azedarach Linn.) seen from total cholesterol, and LDL in male albino rats. Male wistar albino rats were divided into 5 groups, negative control group (sodium CMC 0.5%), positive control group (simvastatin 0.193 mg/200 gBW), group I (ethanol extract mindi’s leaves with dosage 300 mg/200 gBW), group II (ethanol extract mindi’s leaves with dosage 600 mg/200 gBW), and group III (ethanol extract mindi’s leaves with dosage 1200 mg/200 gBW). The rats were given high-fat supplement and propylthiouracil for 15 days to increase cholesterol, and the extract was given for the next 15 days. Average cholesterol level, LDL, and body weight after induction was 90.28 mg/dL, 31.09 mg/dL, and 222.32 g. The result showed ethanol extract mindi’s leaves could decreased total cholesterol level and LDL level with % decreased in total cholesterol (%PDTC) and % decreased in LDL (%PDLDL) of group I is 37.78% and 35.57%, group II is 45.99% and 40.39%, and for group III is 56.29% and 52.42%. The result showed that ethanol extract of mindi’s leaves has antihyperlipidemic activity and significantly different from negative control (p>0.05). Based on the percentage relation of decreased total cholesterol and LDL levels to dose, then the effective dose 50 (ED50) value of ethanol extract mindi’s leave is 869 mg/200 gBW for total cholesterol and for LDL reduction level is 1086.84 mg/200 gBW

Alpha Glukosidase Inhibitory Test and Total Phenolic Content of Ethanol Extract of Parkia Speciosa Plant Fitrya Fitria; Annisa A.; Nikita S.; Ranna C.
Science and Technology Indonesia Vol. 4 No. 1 (2019): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Parkia speciosa (Fabaceae), much grow in South Sumatera. The seed of P. speciosa used as traditional medicine for diabetes mellitus therapy. Another parts of P speciosa is suspected to have the same chemical compounds and potency as the seed. Based on phytochemical screening of leaf and rind of P speciosa have secondary metabolites as flavonoid, phenolic and terpenoid. This research aims to know effectiveness of alpha glucosidase inhibitory effect of ethanol extract of rind, leaf and seed of p. speciosa and its correlation to total phenolic content of the extracts. The inhibitory activity of the alpha glucosidase enzyme was measured at l 405 nm. The result showed that there was correlation between effectiveness of inhibitory and total phenolic content of the extract, that is the higher of the total phenolic content will caused the greater of enzymatic inhibition of extract. The IC50 of alpha glucosidase inhibitory effect of ethanol extract of rind, leaf and seed of P speciosa are 4,596 ppm, 54,341 ppm, dan 67,425 ppm and the total Phenolic content of the extract are 138,15 mgGAE/g, 59,25 mgGAE/g, dan 36,25 mgGAE/g respectively.

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