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I Wayan Sutapa
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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
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Produksi Ekstrak Bioaktif Untuk Aditif Pangan Dari Limbah Kulit Buah Naga: Pengaruh Metode Pre-Treatment Dan Ekstraksi Shofinita, Dian; Bindar, Yazid; Jaelawijaya, Arwinda Aprillia; Harimawan, Ardiyan; Fawwaz, Mifta
Indonesian Journal of Chemical Research Vol 8 No 1 (2020): Edisi Bulan Mei (Edition for May)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2020.8-dia

Abstract

Dragon fruit is one of the tropical fruits can be grown in Indonesia. The skin of dragon fruit, which is accounted for 30-35% of the whole fruit usually thrown away as waste. This study aims to produce a bioactive extract from extraction of dragon fruit skin that is rich in phenolic and pigment compounds then it used as food additives. The variation that was used in this study includes the application of drying as pre-treatment of dragon fruit skin and the extraction methods (maceration and Soxhlet extraction). The obtained extracts were evaluated for the amount of total phenolic compounds and pigments (anthocyanin and betacyanin). Drying of dragon fruit skin was found to yield lower amounts of bioactive materials, which may occur due to the thermal degradation even though a low drying temperature was used. In addition, the maceration method was found to give a higher amount of bioactive materials compared with the Soxhlet method. The extraction with the highest yield of bioactive materials was obtained by the use of fresh dragon fruit skin and maceration for 240 minutes, which gave amounts of anthocyanin, betacyanin, and total phenolic compounds of 0.08, 0.04, dan 0.35 mg/g fresh dragon fruit skin, respectively.
Karakterisasi Fotokatalis Untuk Fotoreduksi Karbon Dioksida Menjadi Asam Format Dalam Fasa Akuatik Rizkiana, Jenny; Devianto, Hary; Soerawidjaja, Tatang Hernas
Indonesian Journal of Chemical Research Vol 8 No 1 (2020): Edisi Bulan Mei (Edition for May)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2020.8-jen

Abstract

Photoreduction of carbon dioxide is one of the promising method to reduce green house gas emission. Carbon dioxide can be converted into organic chemical that has higher economic value by utilizing light energy. One of the favorable product is formic acid which is can be used as hydrogen-carrier. For this process, photocatalyst plays important role as it can increase the rate of reaction and as well as the selectivity as such more desirable product can be produced. The objective of present study is to develop photocatalyst which can significantly catalyze the photoreduction process of CO2 to form formic acid. Zinc titanate doped with aluminium is used as the base photocatalyst. Photoreduction process is held in room condition using three 2800 lm lamp. Qualitative analysis of the product is done by silver solid test and acidity test while quantitative analysis is done by High Performance Liquid Chromatography (HPLC) test. The silver solid test results confirm that formic acid is formed during process. Based on acidity profile data, anthocyanin as photosensitizer could increase higher acidity in the mixture than melanin. However, the concentration of formic acid in the solution is still very low so that it cannot be detected by HPLC.
Pengaruh Tekanan Dan Tahap Kompresi Dalam Pemurnian Biogas Menjadi Biometana Dengan Absorpsi CO2 Menggunakan Air Bertekanan Raksajati, Anggit; Adhi, Tri Partono; Ariono, Danu
Indonesian Journal of Chemical Research Vol 8 No 1 (2020): Edisi Bulan Mei (Edition for May)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2020.8-ang

Abstract

Palm oil mill effluent (POME) from condensate stew, hydrocyclone water, and sludge separator contains organic carbon with a COD more than 40 g/L and a nitrogen content of about 0.2 and 0.5 g/L as ammonia nitrogen and total nitrogen. At present, the POME is converted into biogas using anaerobic ponds. Biogas produced contains 60% methane (CH4) and 40% carbon dioxide (CO2) and can be purified into biomethane through CO2 absorption using water. This study evaluates the optimum pressure and feed compression stage in biogas upgrading into biomethane. The results show the rate of circulation of water needed to separate CO2 from biogas feed decreases with increasing absorber pressure due to increased solubility of CO2 in water. Water circulation pumps and biogas compressor works increase due to the increase in pressure difference needed. The optimum pressure of the biogas biogas purification unit is within the range of 7-10 bar. At the same absorber pressure, the 1 stage feed compression unit is cheaper than that of 2 stages. However, the overall process with 1 compression stage might not be more economical than the 2-stage if consider the higher methane loss.
Pemilihan Metode Perhitungan Kimia Komputasi Semi-empiris untuk Pengembangan 1,3,4-Thiadiazole Paramita, Sari; Permata S., Maylani; Vaulina Y.D., Eva; Nasrokhah, Nasrokhah; Iswanto, Ponco
Indonesian Journal of Chemical Research Vol 8 No 1 (2020): Edisi Bulan Mei (Edition for May)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2020.8-pon

Abstract

Computational chemistry methods are those used to help researchers design chemical compounds optimally, so that experiments and mistakes do not need to be done in the laboratory. This is a very important step because it can save costs, chemicals, and also the time spent. The method used in this study is semi-empirical, while the parameters used in this study are the infrared (IR) spectrum and the core magnetic resonance (NMR) spectrum which will be matched with the results of the study. The compound to be investigated is 1,3,4-Thiadiazole is a heterocyclic compound which is very useful in the field of medicines which contain anti-inflammatory, anticancer, glaucoma drugs etc. The results showed the most appropriate calculation method is PM3 based on infrared variation values of 1697.44 and the PRESS value of nuclear magnetic resonance variation of 21.170.
Analisis Kualitas Nata De Corn Dari Ekstrak Jagung Kuning Muda Dengan Variasi Lama Fermentasi sulistiyana, sulistiyana
Indonesian Journal of Chemical Research Vol 8 No 1 (2020): Edisi Bulan Mei (Edition for May)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2020.8-sul

Abstract

In this research, nata de corn has been made from the young corn extract by Acetobacter xylinum. This research aims to make nata de corn with the variation of fermentation days and analyze the quality of nata de corn have been done. Fermentation days have been varied to look for the optimum conditions to obtain maximum quality. The variation of fermentation days was 11, 12, 13, and 14 days. Mass of young corn as substrate was 150 g/L solution. Then, Substrate was fermented using Acetobacter xylinum. The result of fermentation proses was called nata de corn. The nata de corn has been analyzed to obtain maximum % yield, water, and fibre content. The maximum % yield, water and fibre content were 46.82%, 93.13%, and 1.3%. This values in according to the standard quality of nata INS No.01-4317-1996.
Kapasitas Antioksidan Ekstrak Buah Rukam (Flacourtia rukam) Menggunakan Metode Microwave Assisted Extraction (MAE) Fadiyah, Inas; Lestari, Iin; Mahardika, Robby Gus
Indonesian Journal of Chemical Research Vol 7 No 2 (2020): 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.2020.7-ina

Abstract

Rukam fruit (Flacourtia rukam) is one of the species spread in Indonesia, specifically Bangka Island. Rukam has a higher phenolic ratio than guava (Psidium guajava). Phenolic compounds have a major role as antioxidants, while antioxidants have the ability to fight free radicals. Therefore a study was conducted to examine the application of secondary metabolites and antioxidant bioactivity of the Flacourtia rukam species using the Microwave Assisted Extraction method. Rukam fruit extract is obtained by using the Microwave Assisted Extraction (MAE) method. While for the antioxidant test using the DPPH method. The test results of antioxidant activity of rukam fruit extract with ethanol solvent were obtained with IC50 value 47.7022 ppm and in rukam fruit extract with acetone solvent IC50 33.1702 ppm obtained using this antioxidant antioxidant powder was very strong.
Serbuk Gergaji Kayu Jati Teraktivasi EDTA Sebagai Penjerap Ion Tembaga (II) dan Krom (III) Irdhawati, Irdhawati; Triyunita Sinthadevi, Ni Nyoman; Sahara, Emmy
Indonesian Journal of Chemical Research Vol 7 No 2 (2020): 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.2020.7-ird

Abstract

Teak sawdust is a waste of the furniture industry. The main compound content is cellulose, which contains hydroxyl groups so that can be used as adsorbent. This work aims to determine adsorption capacity and isotherm adsorption pattern of teak sawdust activated by EDTA for copper (II) dan chromium (III) ions. Some parameters were optimized including the ratio of adsorbent and EDTA, and contact time. The results showed the optimum ratio of teak sawdust and EDTA was 2:3, and the optimum contact time was 105 minutes. Both of isoterm adsorption patterns of teak sawdust to Cu (II) and Cr (III) ions follow the Freundlich equation, with determination coefficient close to one. Optimum adsorption capacity was obtained 46.5 and 39.7 mg/g for Cu (II) and Cr (III), respectively.
Tinjauan Kinetika Kimia Daya Hambat Minyak Daun Cengkeh (Syzygium aromaticum) dan Hasil Mikroenkapsulasinya Terhadap Eschericia coli Nurliana, Laily -; Kurniawati, Desi; Musta, Rustam; Abdul Kadir, Laode; Dewi, Fitria; Nurjana, Siti
Indonesian Journal of Chemical Research Vol 7 No 2 (2020): 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.2020.7-lai

Abstract

The secondary metabolite compounds contained in clove leaves oil have the potential to be antibacterial Escherichia coli. The kinetic analysis is based on the inhibition zone formed as a result of the inhibition of clove leaves oil and the results of microencapsulation on E. coli bacteria. The determination of the inhibition zone uses the disk diffusion method by using amoxicillin as a positive control and tween oil as a negative control. The kinetic review is intended to find out the antibacterial inhibitory reaction process by determining the reaction order (n), rate constant (k) as well as the At-Ao-t relationship of clove leaves oil and the results of its microencapsulation. Based on the research results obtained by the reaction order (n) of clove oil as an antibacterial E. coli is n = 0.1913; with the rate constant k = 5.7679. The reaction order (n) results of microencapsulation as antibacterial E. coli are 0.5039; with the rate constant k = 4.7323.
Studi Akumulasi Logam Berat Merkuri Menggunakan Tanaman Awar-Awar (Ficus Septica Burm F) Mariwy, Abraham; H. Dulanlebit, Yeanchon; Yulianti, Fian
Indonesian Journal of Chemical Research Vol 7 No 2 (2020): 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.2020.7-abr

Abstract

This research aims to to study the ability of awar-awar plants ((Ficus Septica Burm. F)) to accumulate heavy metals. Awar-awar are grown in glass reactors and treated with 10 ppm mercury solution wich one, two, and three weeks in time variations. The analysis using CV-AAS showed that the total absorption of mercury heavy metals by awar-awar plants in reactors I, II and III was 81.7%, 34.6% and 85.4% respectively. When the phytoremediation process takes place the plant shows no symptoms of damage or even death even though it has accumulated more than 50% of mercury from the growing media. The BCF value of awar-awar plants in reactor I was 2.79 reactor II was 0.53 and reactor III was 0.55. While the TF values ​​in reactors I, II and III were 0.04; 1.13 and 0.97. The calculation results of BCF and TF values ​​show that Awar-awar plants (Ficus Septica Burm. F) can accumulate heavy metals of mercury so it is recommended to be used as a phytoremediation agent in mercury-contaminated soils.
Kinetika Kimia Antibakteri Fraksi Alkana Alifatik Hasil Pirolisis Cangkang Biji Jambu Mete (CNS) Musta, Rustam; Nurliana, Laily; Andraysno, Andraysno
Indonesian Journal of Chemical Research Vol 7 No 2 (2020): 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.2020.7-rus

Abstract

Chemical kinetics research antibacterial of aliphatic alkane fraction from the results of pyrolysis Cashew Nut Shell (CNS) (Annacardium occidentale L.) on Eschericia coli have been carried out. Cashew nuts are prepared by separating the shell and seeds for pyrolysis and purifying using a fractional distillation device. The results of E. coli anti-bacterial activity test from aliphatic alkane fractional distillation results of cashew nut shell pyrolysis products showed that the inhibitory power was different from each concentration variation of 100%, 75%, 50%, 25%, and 12.5%, with inhibitor zone: 8.02; 7.16; 5.56; 4.52 dan 4.26 mm which indicates that the inhibition is weak category for 12.5% and 25%, medium category for 50%, 75% and 100%. The clear zone that has been formed are calculated in terms of its chemical kinetics including the reaction order and the activity rate constant. The reaction order (n) antibacterial of aliphatic alkane fraction from the results of pyrolysis CNS on E. coli was 0.3145 with a constant activity rate of (k) = 1,7791.

Page 13 of 32 | Total Record : 314

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