cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
I Wayan Sutapa
Contact Email
wayansutapa@fmipa.unpatti.ac.id
Phone
+6281343001979
Journal Mail Official
ijcr@fmipa.unpatti.ac.id
Editorial Address
Department of Chemistry, Faculty Mathematics and Natural Science, Pattimura University, Ambon, Maluku
Location
Kota ambon,
Maluku
INDONESIA
Chemistry Indonesian Journal of Chemical Research
  • Indonesian Journal of Chemical Research (Indones.
  • Website
Published by Universitas Pattimura
ISSN : 23385359     EISSN : 26142627     DOI : 10.30598//ijcr.2021.-irm
Core Subject : Science, Social, Engineering,
Biochemistry, Genetics & Molecular Biology Chemistry Engineering Environmental Science
Indo. J. Chem. Res. is a journal that regularly publishes primary articles covering all branches of chemistry and its sub-disciplines. Published articles consist of complete research, short communication, and review articles. The scope of published articles is not limited to inorganic chemistry, physical chemistry, organic chemistry, analytical chemistry, and biochemistry. Editors can invite articles review of authors that includes the latest developments in the field of interest of certain chemicals. A contribution is open to researchers from all countries.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 314 Documents
 5   6   7   8   9 
Potensi Ekstrak Metanol Kulit Batang Lannea coromandelica (Houtt.) Merr. Terhadap Staphylococcus aureus Dan Analisis Metabolit Sekunder Utamanyanya Syamsurya, Syamsurya; Ahmad, Ahyar; Firdaus, Firdaus
Indonesian Journal of Chemical Research Vol 4 No 1 (2016): Edisi Bulan Juli (Edition For July)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2016.4-sya

Abstract

This study aims to determine the potential of the methanol extract of the stem bark Lannea coromandelica (Houtt.) Merr. against Staphylococcus aureus and to analyze the main secondary metabolites. Staphylococcus aureus antibacterial activity test was performed by Mueller-Hinton agar medium whereas the secondary metabolite analysis of the methanol extract of the stem bark is conducted by GC-MS instrument. Results of research the methanol extract of bark Lannea coromandelica (Houtt.) Merr showed antibacterial activity against Staphylococcus aureus with inhibition zone diameter each at a concentration of 2.5% by 7.3 mm by 8.6 mm 5% and 10% of 10.4 mm. Selanjunya result of analysis by using GC-MS showed the presence of compounds 5-hidroksimetilfurfural and compounds 1, 2, 3-benzenetriol potential as an antibacterial Staphylococcus aureus. Furthermore, the results of analysis by GC-MS instrumeny showed the presence of compounds 5-hidroksimetilfurfural and compounds 1, 2, 3-benzenetriol potential as an antibacterial Staphylococcus aureus.
Pengaruh Variasi Garam Ammonium Terhadap Keasaman Zeolit Alam Pada Reaksi Perengkahan Minyak Jelantah Fabiani, Verry A.; Silalahi, Imelda H.; Sayekti, Endah
Indonesian Journal of Chemical Research Vol 5 No 1 (2017): Edisi Bulan Juli (Edition For July)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2017.5-ver

Abstract

Natural zeolite modification with the addition of ammonium salt variations was conducted. The modification was conducted by demineralization method, dealumination and followed by activation of ammonium salt. The types of activators were ammonium chloride, ammonium nitrate and ammonium fluoride. The effect of ammonium salt was assessed through acidity parameter with Si/Al ratio variable and applied catalyst for catalytic cracking of waste cooking oil. The results showed that the activation of natural zeolite by using ammonium chloride salt could increase the acidity of natural zeolite with the highest Si/Al ratio about 15.56. Based on the XRF analysis showed that the reduced amount of Na metal in zeolite about 92.8%. The effect of ammonium salt variation on the acidity of natural zeolites was observed by applying a catalyst in the catalytic cracking of waste cooking oil. Physical characteristic of catalytic cracking products from waste cooking oil indicated all products fulfill the solar standards requirement. The results concluded that ammonium chloride salt was the best activator in natural zeolite modification and generally all ammonium salts gave high acidity effect to natural zeolite in catalytic cracking of waste cooking oil.
Optimation Transesterification Reaction Conditions on Biodiesel Production From Beef Tallow Rosmawaty, Rosmawaty; Bandjar, Adriani; Gunoroso, Suntoro
Indonesian Journal of Chemical Research Vol 2 No 2 (2015): Edisi Bulan Januari (Edition For January)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2015.2-ros

Abstract

Biodiesel synthesis has been done from beef tallow through two step, esterification and transesterification reactions. Esterification process is done by using H2SO4 1M as a catalyst, methanol 1:9, temperature of 60-65°C, and for 3 hours. After separated between methanol and trigyceride, then proceed to the process of transesterification. To obtain the optimum reaction conditions then used some transesterification process variables, there are: the weight percentage catalyst of KOH between 0.1, 0.5, 1; 1.5, and 2%, the reaction time of 1-5 hours and the reaction temperature between 50 -70 oC. Optimum conditions of transesterification reaction for the synthesis of biodiesel derived from beef tallow with KOH catalyst is as follows: the weight percentage of 1% KOH catalyst, the reaction time of 3 hours and the reaction temperature of 65 oC. The results of physical testing of biodiesel fuel by ASTM method includes specific density of 0.8675 g/cm3, kinematic viscosity of 4.971 mm2/s, flash point of 134.5°C, pour point of 27°C, the Conradson carbon residue of 0.018%, and the copper corrosion-pieces of 1B.
Adsorpsi Hg(II) Menggunakan Sargassum crassifolium dengan Adanya Pb(II), Cu(II) dan Fe(II) Nurhadini, Nurhadini; Silalahi, Imelda H.
Indonesian Journal of Chemical Research Vol 5 No 1 (2017): Edisi Bulan Juli (Edition For July)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2017.5-nur

Abstract

Amalgamation use mercury in mining process especially small-scale gold mining and it has been impacted on mercury contamination in environment. Mercury is one of heavy metal that toxic and can accumulate in water, soil and organism. Adsorption method is one of alternative option that effective to remove heavy metal. This method depends on adsorbent type, pH, adsorbent composition with metal or presence of several metal ions. Beside mercury, wastewater of mining gold have another metal ions such as Pb(II), Cu(II) dan Fe(II) can be found by human activity or naturally present. This research aim is to study effect of Pb(II), Cu(II), and Fe(II) in Hg(II) adsorption by using Sargassum crassofolium adsorbent. Research stages are adsorbent activation and mercury adsorption on binary and ternary system respectively in equimass amount of metals ion and equimolar amounts of metals. Based on adsorption analysis is known that Pb(II) and Cu(II) is Hg(II) competitor while Fe (II) is not Hg(II) competitor in adsoption by using Sargassum crassifolium. On binary system in equimass amount of metals ion and equimolar amounts of metals that the largest decreasing effect of Hg(II) adsorption in system contain Cu(II).
Analisis Kadar Logam Kadmium (Cd) dan Timbal (Pb) pada Sedimen Di Teluk Ambon Bagian Dalam Male, Yusthinus T; Malle, Dominggus; Bijang, Catherina Manukpadang; Fransina, Eirene Grace; Seumahu, Cecelia Anna; Dolaitery, Lois Mikhal; Landu, Sartika; Gaspersz, Nelson
Indonesian Journal of Chemical Research Vol 5 No 1 (2017): Edisi Bulan Juli (Edition For July)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2017.5-yus

Abstract

The research about analysis of cadmium (Cd) and lead (Pb) metal content on sediment inner part of Ambon Bay has been done. Sampling point located at Dermaga Ferry Poka, PLTD Poka, Kate-kate, Waiheru, Lateri III, Passo dan PLTD Galala. The results of analyzed of sediment particle size inside the Ambon Bay showed 3 components were sand, gravel, and sludge, but the sediments was dominated by sludge sand. Analysis of Cd content showed that at 7 stations in Ambon Bay detected Cd metal with the highest concentration at 4th station of Waiheru village was 0,6640 mg/Kg and the lowest concentration at 3th station of Kate-kate village was 0,0980 mg/Kg. Meanwhile, the highest Pb content was 20,075 mg/kg at 4th station and the lowest was 5,755 mg/kg at 2nd station of PLN Poka. The content of elements composition of sediment are SiO2, K2O, P2O5, Fe2, BaO, NiO and Ga2O3 but Cd and Pb metal was not detected.
Pengaruh Perbedaan Kondisi Hidrolisis Terhadap Hasil Isolasi Nanokristalin Selulosa Dari Bonggol Jagung Purwanti, Endah; Dampang, Sarah
Indonesian Journal of Chemical Research Vol 5 No 1 (2017): Edisi Bulan Juli (Edition For July)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2017.5-end

Abstract

Cellulose is one of the largest components in corncobs. Cellulose was obtained from corncob in this research that has a yield of 19.6% of 20 grams of corncob powder. The isolated cellulose was characterized by using FTIR and SEM. Cellulose has crystalline chain and insoluble in water or organic solvents. The molecular chain of cellulose is linear and has intra- and inter-molecular hydrogen bonds. One way for cellulose to be easy in the treatment of applications, is to convert microcrystalline cellulose into nanocrystalline cellulose. Nanocrystalline cellulose can be obtained by several methods, one of them by acid hydrolysis. Hydrolysis of cellulose by using sulfuric acid produces nanocrystalline cellulose. Nanocrystalline cellulose can be characterized by using TEM and PSA analysis. CNC 60 has a particle size distribution with a diameter range of 14.3 nm - 45.0 nm and an average diameter of 17.4 nm. Whereas cellulose with CNC 90 has a smaller particle size distribution with a diameter range of 10.0 nm - 17.1 nm and an average diameter of 11.9 nm.
Analysis of Mercury (Hg) Distribution In The Waeapo River Irrigation Area, Buru Regency, Maluku Province, Gold Mining Without Permission Result In Botak Mountain Area Salatutin, Febrian M.; Batawi, Chudeya Y.; Lessil, Camellia Y.; Male, Yusthinus T
Indonesian Journal of Chemical Research Vol 3 No 1 (2015): Edisi Bulan Juli (Edition For July)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2015.3-feb

Abstract

The Waeapo River has 13 watersheds, which are irrigated area for thousand hectare of rice field in the District of Buru. Buru District is one of the area that can supply thousands of tons of rice. But, yields to be reduced by the presence of gold mining activities in the Botak Mountain. Gold mining activities not only impact for the decline in yields, but also impact on the quality of rice by mercury pollution generated by mining waste. This research aims to determine the accumulation of mercury in sediment of Waeapo river. The research method is used survey and analysis method. In this research, observations were done and field sampling with the laboratory analyze. The result showed that concentration of analyzed mercury at four point, one point has exceeded standard of mercury limits in the sediment, i.e 0.1 ppm
Computational Study Natural Color Essence (Dyes) As Active Material On Organic Solar Cell With Density Functional Theory (DFT) Male, Yusthinus T; Sutapa, I Wayan; Ranglalin, Olivia M.
Indonesian Journal of Chemical Research Vol 2 No 2 (2015): Edisi Bulan Januari (Edition For January)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2015.2-yus

Abstract

Computational calculation has been done for anthocyanin, tocoferol and they derivatives. The computational calculation was conduct to know the compound potential of anthocyanin, tocoferol and they derivatives as active material on organic solar cell. Computational calculation was done by used Gaussian 03 for windows with ab inito alternative electron structure theory namely Density Functional Theory (DFT) with B3LYP method at basis set 6-31G (d). Computational calculation obtains that the structure of anthocyanin, tocoferol and they derivatives were symmetrical. There were two compounds of anthocyanin (A1 and A5) and two compounds of tocoferol (T3 and T4) which more stable than the others compounds. The compounds had lowest energy gap were consist of A1= 0.12629 eV, A5= 0.12570 eV, T3= 0.19334 eV and T4= 0.19231 eV. The moment dipole from compound of anthocyanin, tocoferol and they derivatives had highest value, they were A1 and T1 while the total energy had lowest value they A2 and T1. The Substituent methoxy and hydroxy were added the density load of C atom was substituted so it would increase the activity of the phenyl ring on anthocyanin and they derivatives, while substituent methyl and hydroxy were added the density load of C atom was substituted so it was increase the activity of the phenyl ring on tocoferol and they derivatives. For compounds of anthocyanin main orbital populations showed that there were load transfer only from middle chain (ether) and compounds of tocoferol main orbital populations showed that there was load transfer only from phenyl ring. The method of density functional B3LYP/6-31G(d) would be applied to structure prediction and electronic characteristic of anthocyanin, tocoferol compounds and they derivatives before synthetic.
Introduction Analysis Of Several Levels Of The Mercury (Hg) In Shells Male, Yusthinus T; Nanlohy, Alberth Ch.; Asriningsih, Asriningsih
Indonesian Journal of Chemical Research Vol 2 No 1 (2014): Edisi Bulan Juli (Edition For July)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2014.2-yus

Abstract

Water pollution by metallic mercury (Hg) in Buru island as a result of mining activity people are very dangerous for marine life, firstly for Mollusca that was consumed by local communities. Therefore, it is needed to measure the levels of pollution Hg of shells. The research has been done on several types of shells, taken at several different points, those are: at the Namlea market, Arumbae market, and Latuhalat beach. The research’s method used Cold Vapour Atomic Absorption Spectrophotometry (CV-AAS). The results obtained by the concentration of metals Hg in Polla shells (Telebraria sulcata) 0.19240 mg/kg; Manis shells (Ruditapes variegatus) 0.27171 mg/kg; Ciput shells (Nerita polita) 0.31387 mg/kg; Keong shells (Thais aculeata) 0.05556 mg/kg; Tudung shells (Cellana radiata) 0.05922 mg/kg and Bapaco shells (Telescopium telescopium) 0.00183 mg/kg. Based on the results of this research, the mercury (Hg) concentrations of several types of shells which contain levels of Hg that low enough and has not exceeded the threshold set by WHO as big as 0.5 mg/kg. Even that there was small concentrations of metals, it can be acumulated in human’s body and can be fatal to the health of humans who consume shells.
Analisys Of Lead (Pb) And Chromium (Cr) Content In The Roots Of Seagrass (Enhalus Acoroides) In Waters Of Waai And Tulehu Village Central Maluku Regency Male, Yusthinus T; Sunarti, Sunarti; Nunumete, Neti
Indonesian Journal of Chemical Research Vol 1 No 2 (2014): Edisi Bulan Januari (Edition For January)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2014.1-yus

Abstract

The research has been done with the aim to determine the content of heavy metals Pb and Cr on the roots of seagrasses (Enhalus acoroides) by using Spektrofotometry Atomic Absorption (SSA). Samples have been taken from the waters of Waai and Tulehu village. The result show that the content of Pb on the roots of seagrasses in the waters of Waai village and Tulehu village is 26,262 mg/Kg; 18,491mg/Kg; 16,272 mg/Kg dan 12,272 mg/Kg. While the content of Cr on the roots of seagrasses in the waters of Waai village ang Tulehu village 33,066 mg/Kg; 7,752 mg/Kg; 109,535 mg/Kg; 22,464 mg/Kg. The result of this study can be used as a reference for the claim that the roots of seagrasses in the Waters of Waai village and Tulehu village contain metals Pb and Cr quite high.

Page 7 of 32 | Total Record : 314

 5   6   7   8   9 

Filter by Year

2013 2026


Reset
Filter By Issues
All Issue Vol 13 No 3 (2026): Edition for January 2026 Vol 13 No 2 (2025): Edition for September 2025 Vol 13 No 1 (2025): Edition for May 2025 Vol 12 No 3 (2025): Edition for January 2025 Vol 12 No 2 (2024): Edition for September 2024 Vol 12 No 1 (2024): Edition for May 2024 Vol 11 No 3 (2024): Edition for January 2024 Vol 11 No 2 (2023): Edition for September 2023 Vol 11 No 1 (2023): Edition for May 2023 Vol 10 No 3 (2023): Edition for January 2023 Vol 10 No 2 (2022): Edition for September 2022 Vol 10 No 1 (2022): Edition for May 2022 Vol 9 No 3 (2022): Edition for January 2022 Vol 9 No 2 (2021): Edition for September 2021 Vol 9 No 1 (2021): Edition for May 2021 Vol 8 No 3 (2021): Edition for January 2021 Vol 8 No 2 (2020): Edition for September Vol 8 No 1 (2020): Edisi Bulan Mei (Edition for May) Vol 7 No 2 (2020): Edisi Bulan Januari (Edition for January) Vol 7 No 1 (2019): Edisi Bulan Juli (Edition For July) Vol 6 No 2 (2019): Edisi Bulan Januari (Edition For January) Vol 6 No 1 (2018): Edisi Bulan Juli (Edition For July) Vol 5 No 2 (2018): Edisi Bulan Januri (Edition For January) Vol 5 No 1 (2017): Edisi Bulan Juli (Edition For July) Vol 4 No 2 (2017): Edisi Bulan Januari (Edition For January) Vol 4 No 1 (2016): Edisi Bulan Juli (Edition For July) Vol 3 No 2 (2016): Edisi Bulan Januari (Edition For January) Vol 3 No 1 (2015): Edisi Bulan Juli (Edition For July) Vol 2 No 2 (2015): Edisi Bulan Januari (Edition For January) Vol 2 No 1 (2014): Edisi Bulan Juli (Edition For July) Vol 1 No 2 (2014): Edisi Bulan Januari (Edition For January) Vol 1 No 1 (2013): Edisi Pertama (First Edition) More Issue