Journal of Applied Chemical Sciences

Investigation of the Effect of a Flocculent of Bentonite Clay with MgCO3 in Synthetic Acid Mine Drainage (AMD) Treatment

2020-02-03T01:09:57+00:00

Effect of a flocculent of bentonite clay with MgCO3 in Synthetic AMD was investigated in present study. The AMD samples were collected from the western decant in Krugersdorp, South Africa was modified by adding arsenic, zinc and cobalt. The pH, conductivity, dissolved oxygen (DO), oxygen reduction potential (ORP) and turbidity were measured. Those samples were treated with bentonite clay, MgCO3 and a flocculent of bentonite clay and MgCO3 respectively in a jar test, employing either rapid or slow mixing. Results showed that the conductivity of the samples with increasing bentonite clay while keeping MgCO3 constant decreased with increasing dosage, which was attributed to adsorption of the ions onto the negative sites of the porous bentonite when ionic strength increased. The oxygen content of the DO and ORP was not influenced by the rate of mechanical agitation, i.e. rapid and slow mixing respectively. Destabilization-hydrolysis was not influenced by the pH but the ionic strength of the colloidal AMD suspension, valence and electronegative of the metal ions. Turbidity removal of the synthetic flocculent used occured through physico-chemical phenomenon (SEM micrographs) and charged porous bentonite clay. In conclusion: Bentonite clay controls equilibrium state of the ionic strength of the system through adsorption of excess ions added to the system. Velocity gradient induced by mechanical agitation does not have an influence on the turbidity removal.

Keywords: wastewater, coagulants, AMD, mixing, shaking, turbidity

Synthesis, Evaluation, Modeling and Simulation of Nanopore NaA Zeolite Membranes for Application in Ethanol Separation

2020-02-03T00:55:02+00:00

Zeolite membranes have uniform and molecular-sized pores that separate molecules based on the differences in the molecules’ adsorption and diffusion properties. Strong electrostatic interaction between ionic sites and water molecules (due to its highly polar nature) makes the zeolite NaA membrane very hydrophilic. Zeolite NaA membranes are thus well suited for the separation of liquid-phase mixtures by pervaporation. In this study, experiments were conducted with various ethanol–water mixtures (1–20 wt. %) at 25 °C. Total flux for ethanol–water mixtures was found to vary from 0.331 to 0.229 kg/m².h with increasing thanol concentration from 1 to 20 wt.%. Ionic sites of the NaA zeolite matrix play a very important role in water transport through the membrane. These sites act both as water sorption and transport sites. Surface diffusion of water occurs in an activated fashion through these sites. The precise Nano-porous structure of the zeolite cage helps in a partial molecular sieving of the large solvent molecules leading to high separation factors. A comparison between experimental flux and calculated flux using Stephan Maxwell (S.M.) correlation was made and a linear trend was found to exist for water flux through the membrane with ethanol concentration. A comprehensive model also was proposed for the ethanol-water pervaporation by Finite Element Method (FEM). The 2D model was masterfully capable of predicting water concentration distribution within both the membrane and the feed side of the pervaporation membrane module.

Keywords: nanopores, pervaporation, ethanol separation, zeolite NaA membrane, FEM simulation

Extraction and Characterization of Crop Oil from Seed Kernels of Feunkase (Thevetia peruviana) as Feedstock for Biodiesel Production

2020-02-02T20:06:12+00:00

The seed kernel of Feunkase (Thevetia peruviana) was extracted with n-hexane and methanol mixture in a soxhlet extractor. The optimum condition for extraction of the crop oil from the seed kernel of Feunkase using conventional soxhlet technique was studied. Solvents used weren-hexane and n-hexane–methanol binary solvent. The parameters investigated effecting the oil yield involved various solvent polarities, extraction time, and temperature. Each experiment was conducted in 250 cm 3 soxhlet apparatus. The extracted oil was analyzed to examine the physicochemical characteristic, included: density, kinematic viscosity, acid, iodine, and saponification value, and water content. The optimum conditions were found after 4.0 h extraction time, extraction temperature of 70^o C, and n-hexane - methanol ratio of 50:50 (polarity index 3.30). The oil extract was found to be 46.84 ± 0.26%. The physicochemical properties of the extracted oil were density of 785 (kg/m³), viscosity of 0.68 (mm²/s), iodine value of 41.11 (g I₂/100 g oil), acid value of 0.09 (mg KOH/g oil), saponification value of 108.4 (mg KOH/g oil), and water content of 0.034 (%). These results revealed that the crop oil from seed kernel of Feunkase is one of the potential feed stocks for biodiesel production.
Keywords: biodiesel, crop oil, Feunkase, feedstock, thevetia peruviana

Physiological Status of Fattening Bali Cattle Feeding a Concentrate Containing Gliricidia sepium Leaves Meal Fortified with Vitamin B-Complex and Vermicide

2020-02-02T11:11:52+00:00

This research has been conducted at Oeletsala village, for 10 weeks from 23 November 2015 to 23 January 2016, comprised of 2 weeks preliminary and 8 weeks for data collection. The aim of the research was to study the effect of feeding a Gliricidia sepium leaves meal concentrate fortified with B. complex vitamin and vermicide on rectal temperature, respiratory frequency, and heart rate of fattening Bali cattle. Experimental animals used were nine young male Bali cattle of 1.5-2 years old, with an initial body weight ranging from 82 to 124 kg (KV=15.114%) in average of 98.7±14.93 kg. The experimental design used was Randomized Block Design with three treatments and three replications. Those treatments were R0 = leaves of Leucaena leucocephala and Ceiba pentandra+ native grass ad libitum (as commonly practiced by local farmers), R1 = R0 + 2 kg concentrate, and R2 = R1 + B. complex vitamin, and vermicide. Statistical analysis showed that there was no significant effect of the treatments on rectal temperature, respiratory frequency, and heart rate of the fattening Bali cattle(P ≤ 0.05).In conclusion, there was no significant effect of Gliricidia sepium leaves meal concentrate, vitamin B. complex, and vermicide on rectal temperature, respiratory frequency, and heart rate of the fattening Bali cattle.

Keywords: concentrate, B complex vitamin, worm vermicide, rectal temperature, respiratory frequency, and heart rate

Characterization of Cinnamadehyde Compound Isolated from Cinnamon Oil and Its Salmonella Typhy Antibacterial Activity

2020-02-02T11:00:14+00:00

Today many infectious diseases are common. All of the diseases are caused by agents such as viruses or bacteria which are pathogenic and Salmonella typhi is one of the pathogenic bacteria. In addition, many antibiotics are not able to work properly because of the resistance of bacteria against the exciting antibiotics. Therefore, research to discover the new anti-bacterial compounds derived from natural materials is important to do. This research was conducted in several stages, that involved: (1) Isolation of cinnamaldehyde from cinnamon oil by two methods: thin layer chromatography using n-hexane: ethanol eluent at a ratio of 5 : 95 and bisulfate additional, (2) Identification of cinnamaldehyde by UV-Vis Spectrophotometer and GC-MS to define its purity, (3) The various concentrations of the cinnamaldehyde extracts were incubated with Salmonella typhi bacteria to evaluate the antibacterial activities of the extracts, (4) The growth of the tested bacteria was
observed using a colony counter to see the diameter of the resistance which was caused by the test solution. Analysis result of Gas Chromatography – Mass Spectrophotometer showed that cinnamon oil (Cassia oil) contains cinnamaldehyde as the main component of 88.33 %. The isolation of cinnamaldehyde by bisulfate addition method obtained cinnamaldehyde as yellow fluid with a yield of 86.79 %. The antibacterial activity test indicated that cinnamaldehyde had the potential as an antibacterialagainst the Salmonella typhi which was known from its inhibition zone. At the concentration of 100 ppm, cinnamaldehyde solution showed an inhibitory diameter of 15.4 mm and amoxicillin antibiotic showed of 16.6 mm.

Keywords: activity, antibacterial, cinnamaldehyde, isolation, characterization, inbihitory zone

Identification and Characterization of Fat Compositions Contained within Hexane Extracts of Canarium Seed Oils (Canarium Indicum L)

2020-02-02T10:54:38+00:00

One of the plants producing fatty acids is a canary plant which is found everywhere in Alor Island, NTT province, Indonesia. This study aimed to determine the content and types of fatty acids of Canary seed oil (Canarium indicum L). The method used was extraction and continued by the GC-MS for fatty acid characterization. Results of the analysis showed that Canary seed oil contains saturated fatty acids and unsaturated fatty acids. The saturated fatty acids are palmitic acid and stearic acid while the unsaturated fatty acid is oleic acid.

Keywords: canary, fatty acids, GC-MS

Geostatistical Analysis of Plastic Waste Disposal to Ecosystem (Vegetation) in Kefamenanu of North Central Timor Regency

2020-02-02T10:30:32+00:00

The research was conducted in June – July 2017, in Kefamenanu of North Central Timor District. Number of locations of plastic waste contamination used as research sites were 44 (forty-four) points. The samples in this study were 4 points of plastic waste disposal. The objectives of this research are: 1) to geostatistically mapping soil pH, soil moisture, air temperature and humidity of area contaminated by plastic waste disposal in Kefamenanu, 2) to know which species are found in research location, 3) to understand statistically the relationship between accumulations of plastic waste to vegetation density in Kefamenanu. The methods used in this research are: 1) data collection of plastic waste dumping point by using GPS. The location is expressed in latitude and longitude coordinates; 2) sampling method was purposive sampling. The analysis of vegetation is quantitative analysis, and quadratic method was used for research implementation of terrestrial
vegetation. The observed data were analyzed in the following ways: a) Geostatistical map of the area was generated from ArcGIS 10.4 software, b) Calculating density parameters, and c) Statistical analysis using t-test for two independent means.The study revealed that From inferential statistical analysis through t-test, it cannot be proved that there is a difference in vegetation density between accumulated and not accumulated plastic waste sites because the number of samples analyzed is very small. Statistically descriptive through the calculation of the mean (also
illustrated in the mean graph), there is a difference in the mean of the density of vegetation (either absolute density or relative density) between the accumulated and non-accumulated plastic waste sites.
Keywords: geostatistical analysis, vegetation density, plastic waste

Validation of Spectrophotometric Method for Analysis of Anionic Surfactant Dodecyl Benzene Sulphonate (DBS) in Catfish (Clarias batrachus) Using Malachite Green

2020-02-02T10:20:35+00:00

Validation method of DBS anionic surfactant analysis on Clarias batrachus has been conducted. The method of analysis was divided into twophase, namely the extraction with solid-liquid extraction
using Soxhlet and analysis DBS. The extraction was performed using n-hexane and methanol for 9 and 6 hours, respectively. The analysis was performed using Spectrophotometer UV-Vis based on the complex formation of surfactant-malachite green (DBS-MG). These methods are applied to determine DBS accumulation of Clarias batrachus with DBS concentration exposure and DBS concentration of Clarias batrachus in markets. The result showed that the parameters of validation methods has high acceptability as linearity (R² = 0.99), limit of detection (LOD) and limit of quantification (LOQ) (0.029 mg/L and 0.089 mg/L), sensitivity (ε = 38.15 × 10⁴ L mol^-1 cm^-1), precision (RSD = 0.10-1.83 %) and accuracy (recovery = 80-92 %). The result of analysis of DBS in Clarias
batrachus with 2.5; 5; 10; 15 mg/L of DBS concentration exposure obtained 5.5; 6.8; 7.9; 8.7 mg/L respectively and Clarias batrachus from markets in a range 2.0-4.2 mg/L. The result showed that the analysis of DBS anionic surfactants using MG can be applied for Clarias batrachus.

Keywords: validation method, extraction, clarias batrachus, dodecyl benzene sulfonate, malachite green

Antioxidant Activity of Methanol and n-Hexane Fractions of the Barf of Kersen (Muntingia Calabura) Extracts

2020-02-02T09:38:55+00:00

Antioxidants are substances that can slow or prevent the oxidation process. Antioxidants can also be defined as compounds that protect cells from the harmful effects of reactive oxygen free radicals. Plants containing antioxidants are chemotactonomically characterized by chemical compounds derived from phenolics such as flavonoids, coumarin, xanthones, benzophenone, tannin, lignin, and anthraquinone. Muntingia calabura is one of the plants that is well known in Indonesian forests. Based on previous research, it was reported that a number of flavones and their derivatives that have bioactivity have been successfully isolated from this plant. One area that has this plant is Alor island- Nusa Tenggara Timur. This plant has several benefits, including as a trasditional medicine. The community uses this plant, where as a shade plant for shade and the fruit is consumed directly. However, until now the community has not used this plant as a medicinal plant and there has also been no research on Kersen (Muntingia calabura) from this area. The purpose of this study was to determine the antioxidant activity of the bark Muntingia calabura (Kersen) methanol and n-hexane fraction. The method used is the extraction and the DPPH method. The results obtained showed that the antioxidant activity of the bark of Muntingia calabura methanol fraction (IC₅₀ 124.58 ppm) was higher than the n-hexane fraction (IC₅₀ 244.95 ppm). From the IC₅₀ values, of the both fractions showed that the methanol fraction was very active against antioxidants because it had an IC₅₀ value close to the IC₅₀ value of the positive control 112.872 ppm, while the hexane fraction was less active against antioxidants but still had the potential as an antioxidant.

Keywords: antioxidants, extraction, DPPH, Muntingia calabura (Kersen)

ANALYSIS DOCKING OF PLASMODIUM FALCIPARUM ENOYL ACYL CARRIER PROTEIN REDUCTASE (PFENR) WITH ORGANIC COMPUNDS FROM VIRTUAL SCREENING OF HERBAL DATABASE

2020-02-11T05:52:17+00:00

Malaria is one of problematic infectious diseases worldwide. The absence of an effective vaccine and the spread of drug resistant strains of Plasmodium clearly indicate the necessity for the deveploment of new chemotherapeutic agents. Recent method being developed is searching a new drug of antimalarial using in silico screening, or also known as virtual screening. One of enzyme target that important for growth of the malaria parasite is Plasmodium falciparum Enoyl Acyl Carrier Protein Reductase (PfENR). Inhibition of this enzyme cause the fatty acid biosynthesis type II will be terminated. In this research, in silico screening was performed using AUTODOCK VINA software to find inhibitor candidates of PfENR by using ligands from the database of Medicinal Plants in Indonesia. On the AUTODOCK VINA software moleculer docking experiments were performed between ligands and macromolecule target PfENR. This target that has been optimized with residue removal and charges addition. Ligand is expected to be the PfENR inhibitors.

Keywords: docking, PfENR, malaria, ligand, receptors