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Jurnal Natur Indonesia

JN
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Published by Universitas Riau

ISSN : 14109379 EISSN : 25030345 DOI : https://doi.org/10.31258/jnat

Core Subject : Science, Agriculture, Engineering,

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry

Jurnal Natur Indonesia published since 1998, is a science journal that presents articles on research results, thoughts and views from researchers and experts in the field of biosciences (basic science), including biology, physics, chemistry and mathematics. In the field of biosciences (basic science); Biology, Physics, Chemistry, Mathematics.

Arjuna Subject : Biokimia, Genetika dan Biologi Molekuler - Biokimia, Genetika dan Biologi Molekuler (Lain-Lain)

Articles 306 Documents

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Penghambatan Ekstrak Etanol Sereh (Cymbopogon citratus (DC) Stapf ) terhadap Produksi Verotoksin Escherichia coli Verotoksigenik Cepeda, Gino Nemesio; Hariyadi, Ratih Dewanti; Supar, Supar
Jurnal Natur Indonesia Vol 13, No 1 (2010)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Citronella was a spicy plant used as seasoning in Indonesian food. It was reported to have antimicrobial activity. Itsextract in form of volatile oil prepared by distilation can inhibit the growth of some bacteria. The objective of theresearch was to know the inhibition of ethanolic extract of the citronella on growth and verotoxin production ofverotoxigenic Escherichia coli. The assay of antimicrobial activity was done by using broth dilution and verocellassay. The results indicated that minimum inhibitory concentration of extract can inhibit effectively verotoxinproduction of verotoxigenic Escherichia coli.

Studi Sintesis Analog Piokelin III: Sintesis Asam 3-Asetil-2-(2-(2-Hidroksifenil)- 4,5-Dihidrotiazol-4-Il)Tiazolidine-4-Karboksilat Zamri, Adel
Jurnal Natur Indonesia Vol 10, No 1 (2007)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

The total syntheses of 3-acetyl-2-(2-(2-hydroxyphenyl)-4,5-dihydrothiazole-4-yl) thiazolidine-4-carboxylic acid, a new pyochelin analog is described. The molecule intermediate 4’-(2-hydroxy-phenyl)-2,3,4,5,2’,5,-hexahydro- [2,2’]bithiazolil-4-carboxylic acid was obtained in 4 steps reaction from 2-hydroxybenzonitrile in good yields. The Nacetylation of molecule intermediate was carried out by acetic anhydride to produce pyochelin analog in moderate yields.

Identifikasi Komponen Kimia Damar Mata Kucing (Shorea Javanica) dengan Metode Pirolisis-GC/MS Mulyono, Noryawati; Wijaya, Christofora Hanny; Fardiaz, Dedi; Rahayu, Wuryaningsih Sri
Jurnal Natur Indonesia Vol 14, No 1 (2012)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

The aim of this research was to identify chemical compounds in cat eye dammar. The method included functional groups characterizationby infrared spectrophotometer and identification using Pyrolisis-GC/MS. Infrared spectra of crude sample showed that there were somefunctional groups such as alkyl, carbonyl, vinyl, and hydroxyl. Identification by Pyrolisis-GC/MS showed that dammar consisted of at least67 compounds. This natural gum components could be categorized into 4 groups, i.e. tetra cyclic hydrocarbon (30 compounds, 49.57%),penta cyclic (3 compounds, 2.56%), C 15 compounds (11 compounds, 17.09%), and other group (23 compounds, 18.26%). According to thePy-GC/MS data, brassicasterol is the highest relative concentration in dammar, i.e. 20%.

Trapping Activity of Nematode-Trapping Fungus Arthrobotrys dactyloides on the Presence of Sawdust, Microorganisms, and Nematodes Sudirman, Sudirman; Zawani, Karwati
Jurnal Natur Indonesia Vol 13, No 3 (2011)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Once biological control agents of nematodes are introduced into soil, they must function in a very complex and dynamicenvironment. In soil, both nematodes and their antagonists are influenced by other biotic and abiotic factors. However,our knowledge of the effects of these factors in soil is limited. Hence, instead of focusing on the role of individualorganisms in controlling nematode pests, this research aimed to determine the effects of sawdust, microorganisms,and nematodes on trapping activity of Arthrobotrys dactyloides. Experiments were conducted with “standardslide test” and “soil microcosm” using soil amended with various concentrations or without sawdust, with thepresence or the absence of microorganisms, and with the presence or the absence of nematodes (Caenorhabditiselegans and/or Meloidogyne javanica). The experiments were carried out with completely randomized design anddata were analyzed with analysis of variance followed by Tukey’s Honestly Significant Different test. Resultsshowed that sawdust did not have direct effect on ring formation and trapping activity of A. dactyloides. However,sawdust did have effect on microorganisms and C. elegans which then these two factors stimulated ring formationand trapping activity of A. dactyloides.

Modifikasi dan Karakterisasi Titania (M-TiO2) Dengan Doping Ion Logam Transisi Feni dan Cuni Rilda, Yetria; Arief, Syukri; Dharma, Abdi; Alif, Admin
Jurnal Natur Indonesia Vol 12, No 2 (2010)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Structure and size of titania nanoparticles have been modified with doping the transition metal (FeNiand CuNi) and controlling the calcinations temperature. Gel and M-TiO 2 powder were characterized byFT-IR showed the changed in intensity at 4000-400 cm-1. TG-DTA curve show the weigh of sample wasdecreased with the increasing of temperature 25-800°C. XRD pattern used to identify the titania structureshows the highest intensity of anatase at temperature calcination as 500°C. XRD of FeNi-TiO 2 and CuNi-TiO2 FeNi 10.5-41.9 nm and CuNi 12.1-33.5 converted using Debye-Scherrer’s equation and TEM analysisthe distribution of crystal size as FeNi-TiO2 and CuNi-TiO2 10-15 nm. SEM has shown that morphology ofdifferent surface from the FeNi-TiO 2 and CuNi-TiO 2 at different calcinations temperatures. Titaniacomposition can be determined by EDX analysis give as FeNi-TiO2 1:1, 97.01% and CuNi-TiO2 1:1, 94.63%respectly. The surface area has been determined by BET as FeNi-TiO 2 was 64.38 m2/g and CuNi-TiO2was 40.9 m2/g.

Kowanin, Suatu Santon dari Kulit Batang Garcinia cowa Roxb ', Darwati; Bahti, Husen H; ', Supriyatna; ', Dachriyanus
Jurnal Natur Indonesia Vol 11, No 2 (2009)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

The compound tetraoxygenated xanthone was isolated from the crude extract of the stem bark of Garcinia cowaRoxb. The compound tetraoxygenated xanthone was caried out as yellow crystal with melting point 136-1370C.The structure of this compound was detremined base on spectroscopic methods, including UV, IR, 1H-NMR,13C-NMR 1D and 2D. The compound was found to exhibit cytotoxicity against T47D cell by SRB method

Proses Pembuatan Hidrolisat Protein Ikan Rucah Koesoemawardani, Dyah; Nurainy, Fibra; Hidayati, Sri
Jurnal Natur Indonesia Vol 13, No 3 (2011)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

This study aimed to find optimum manufacturing trash fish protein hydrolyzate using the commercial papainenzyme. It is known that fish protein hydrolysates have good functional properties, so it is more widely utilized,especially for food. The study was conducted in two stages, the first stage was to make trash fish protein hydrolyzatetreated with enzyme concentration of 3%, 5%, 7% (w/w), and pH 5; 5.5; 6; 6.5; 7, whereas second stage was to maketrash fish protein hydrolyzate with same from the first stage and so the best treatment followed by treatment ofhalf-hour long incubation and one hour. Parameters observed were soluble protein, foamability, fat binding capacityand emulsion stability. The treatment was repeated three times and the first phase of data analysis using advancedtesting LSD and the second stage using the T test. Results show that the best soluble protein to produce a trashfish protein hydrolyzate enzyme was at a concentration of 5% and pH = 6.5 that was equal to 19.71%. In half an hourincubation produce higher soluble protein values and foamability that were equal to 24.97% and 9.63%, while thebinding capacity of fat in one hour incubation produces a higher value that was equal to 5.03%. Meanwhile, emulsionstability did not differ significantly at both incubation time.

Inhibisi Lipase Pankreas secara In Vitro oleh Ekstrak Air dan Etanol Daun Asam Jawa (Tamarindus indica) dan Rimpang Kunci Pepet (Kaempferiae rotundae) Pradono, Dyah Iswantini; Darusman, Latifah Kosim; Susanti, Ai
Jurnal Natur Indonesia Vol 13, No 2 (2011)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Tamarind and kunci pepet has been used traditionally as herbal medicine to reduce body weight or used asantiobesity. But the mechanism in vitro of this herbal in reducing body weight has not been known yet. Theobjective of this research is to evaluate these herbal as antiobesity by their water and ethanol extracts capabilityin inhibiting pancreatic lipase activity in vitro at pH 8, incubation time 45 minutes, and temperature 400C. Pancreaticlipase used in this research was human pancreatic lipase with concentration of 1.4 × 10-5 μg/μl and the substratewas sesame oil with concentration of 16.2 μg/μl. The water and ethanol extracts of tamarind leaves containedalkaloids, flavonoids, saponins, steroids, and tannins. Water extract of kunci pepet contained alkaloids, flavonoids,saponins, and tannins, while ethanol extract contained alkaloids, flavonoids, saponins, and triterpenoids. Theresults of tamarind leaves extracts showed that ethanol extract in concentration of 150 ppm had the highestinhibitory effect, with the value of 49.0%. Water extract of kunci pepet at concentration of 200 ppm had the highestinhibition, with the value of 65.1%. These values were higher than inhibitory effect of Xenical® 100 ppm as thepositive control, with the inhibition value of 10.6%.

Chemical characteristics of organic wastes and their potential use for acid mine drainage remediation Munawar, Ali; Riwandi, Riwandi
Jurnal Natur Indonesia Vol 12, No 2 (2010)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Organic substrate is an important component of biological treatments for acid mine drainage (AMD) remediation systems. It provides organic substrates to sulfate-reducing bacteria (SRB) in the sulfate (SO4) reduction, resulting in increased alkalinity and metal sulfide precipitates. Natural organic matters vary in their characteristics, and therefore may perform differently for remediation properties. This study was aimed to characterize four locally available organic wastes (bark, empty fruit bunch, sawdust, and chicken manure) potential for AMD remediation. Their chemical properties and elemental compositions were measured. An anaerobic incubation of these wastes in AMD was undertaken to determine their remediation properties. The pH, electrical conductivity (EC), redox potential (Eh), and dissolved Fe and SO4 of the mixtures were measured after the 1st, 7th, 14th, and 30th day of the incubation at room temperature. The results demonstrated that organic wastes varied in their chemical properties and performed differently in treating AMD. Organic wastes containing high alkalinity (high pH) and nutrient concentrations (chicken manure and empty fruit bunch) improved AMD quality through increasing pH (>6) and reducing dissolved Fe and SO4 concentrations. Although sawdust and bark (high CEC) did not increase pH up to acceptable standard at most time, they apparently were able to remove dissolved Fe from AMD through adsorption mechanism.

Extraction of Chemical Warfare Agents from Soils: Case Study on O-ethyl S-2-(diisopropylamino)ethyl methylphosphonothiolate (VX) Zuas, Oman
Jurnal Natur Indonesia Vol 11, No 1 (2008)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Extraction of chemical warfare agents, O-ethyl S-2-(diisopropylamino)ethyl methylphosphonothiolate (VX) in soilsample has been carried out. The extraction was performed using six different solvents including 1% TEA/MeOH,1% NH4OH/MeOH, water pH 2 at the ambient temperature , water pH 2 at temperature 4 0C, water pH 7 at ambienttemperature, and water pH 7 at temperature 4 0C. Percent recovery of VX in soil samples was quantitativelydetermined by mean LC-MS using selected reaction monitoring (SRM). Among the solvents used, water pH 2 attemperature 40C gave the best extraction capability that was indicated by the highest percent recovery of VXobtained. Storing effect of spiked samples was also investigated by extracting the samples containing VX usingwater at pH 2/40C and the degradation product was then identified using multiple reaction monitoring (MRM). Fromthe study, two degradation products were identified as Bis[2-(diisopropylamino)ethyl]disulphide and ethylmethylphosphonate.

Page 17 of 31 | Total Record : 306

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Irwan Effendi

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natur@ejournal.unri.ac.id

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kurniawanronal09@gmail.com

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Kampus Bina Widya KM. 12,5 Simpang Baru, Tampan, Pekanbaru 28293 Indonesia

Location
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Riau

INDONESIA

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Irwan Effendi

Contact Email natur@ejournal.unri.ac.id

Phone +62811764031

Journal Mail Official kurniawanronal09@gmail.com

Editorial Address Kampus Bina Widya KM. 12,5 Simpang Baru, Tampan, Pekanbaru 28293 Indonesia

Location Kota pekanbaru, Riau INDONESIA

Abstract

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Abstract

Contact Name
Irwan Effendi

Contact Email
natur@ejournal.unri.ac.id

Phone
+62811764031

Journal Mail Official
kurniawanronal09@gmail.com

Editorial Address
Kampus Bina Widya KM. 12,5 Simpang Baru, Tampan, Pekanbaru 28293 Indonesia

Location
Kota pekanbaru,

Riau

INDONESIA