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INDONESIA
CHEMISTRY PROGRESS
ISSN : 19795920     EISSN : 27158365     DOI : -
Core Subject : Science,
Majalah Ilmiah Chemistry Progress merupakan media untuk menyebarkan informasi ilmiah dan sarana komunikasi bagi para ilmuan dan cendekiawan melalui tulisan-tulisan ilmiah. Majalah Ilmiah Chemistry Progress terbit dua nomor dalam satu tahun (Mei dan November) berisi kajian penelitian dalam lingkup ilmu kimia (organik, anorganik, analitik, biokimia, fisika, bahan alam, lingkungan, pangan, kelautan, pertambangan, farmasi dan komputasi). Jumlah halaman pervolume adalah 55-65 halaman.
Arjuna Subject : -
Articles 225 Documents
SINTESIS ANTIOKSIDAN 4,6-DIALIL-2-METOKSIFENOL DARI ALIL EUGENOL MELALUI PENATAAN ULANG CLAISEN Suryanto, Edi; Anwar, Chairil
CHEMISTRY PROGRESS Vol 1, No 1 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.1.2008.19

Abstract

The objectives of this study was to synthesized 4,6-diallyl-2-methoxyphenol (DMP) from allyl eugenol by Claisen rearrangement. The reaction was carried out at temperature 170-200oC and the reaction time was 30 minutes. The synthesis of DMP by heating at 170-200oC for a certain period of time appears to be a fairly good and simple method. The synthesis compounds were elucidated by infrared (IR), nuclear magnetic resonance (1H-NMR), and mass spectrometry (MS) techniques. Antioxidant activity evaluated the based on the heating of coconut oil. At higher temperatures of reaction the yield will be higher and at the reaction time 30 minutes will produce will produce higher yield which was 59,19%. The gas chromatographic analysis showed that the purity of DMP was 96,45% The structure of 4,6-diallyl-2-methoxyphenol was identified by IR spectrometry which shows strong absorption at 3527 cm-1 indicating hydroxyl group from the phenolic compound and 1H NMR spectra showed that the number of protons of aromatic ring was two hydrogen while the mass spectrometry showed the molecular ion peak at m/z 204 as base peak and absence of peak at (M-41)+ as the indicator of ally eugenol. The addition of DMP at concentration 200 ppm in coconut oil exhibited excellent inhibition of oxidation reaction more than BHT as control positive. The result concluded that 4,6-diallyl-2-methoxyphenol had antioxidant activity on heating of coconut oil at 80oC for 30 day.
SINTESIS METIL ESTER ASAM LEMAK DARI MINYAK KELAPA HASIL PEMANASAN Rorong, Johnly; Aritonang, Henry F.; Ranti, Ferdinan P.
CHEMISTRY PROGRESS Vol 1, No 1 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.1.2008.20

Abstract

A research has been done to synthesis mixed fatty acid esther from coconut oil, before and after heating with variation time 1, 2 and 3 hours at ±175-180 ºC. The synthesis was done with transestherification method using acid as a cathalyst at 65 °C. The transestherification result was analyzed using gas chromatography to obtain its fatty acid composition. The mass of FAME obtained from methyl esther synthesized from coconut oil with heating time 0, 1, 2 and 3 hours are; 94.73 g, 93.57 g, 95.76 g dan 93.88 g respectively.
DERAJAT KRISTALISASI SEBAGAI FUNGSI WAKTU AGEING DAN WAKTU KRISTALISASI PADA SINTESIS ZEOLIT A DENGAN RADIASI GELOMBANG MIKRO Wuntu, Audy D.; Tangkuman, Herling D.
CHEMISTRY PROGRESS Vol 1, No 1 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.1.2008.21

Abstract

A-type zeolite has wide application in the field of catalysis and adsorption in industry and daily use as well. This material in a kind of synthetic material and can be synthesized from various raw materials and using various method, one of which is conventional hydrothermal condition. The use of microwave is one of the methods that can reduce the time needed for A-type zeolite synthesis. In this research, the power of the microwave is set to 720 Watt with ageing time of 0 hour and period of synthesis is set at the range of 0 to 50 minutes. Characterization of the zeolite synthesized using microwave was performed using infra red spectroscopy and the result was compared to that synthesized at conventional hydrothermal condition. The results showed that conventional hydrothermal condition at 0 hour ageing time and 5 hours crystallization period gave zeolite more crystallized than that resulted using microwave. The period of zero to 50 minutes crystallization time at microwave did not result in crystallized zeolite.
PENGARUH KONSENTRASI SIANIDA TERHADAP PRODUKSI EMAS Tangkuman, Herling D.; Abidjulu, Jemmy; Mukuan, Hendra
CHEMISTRY PROGRESS Vol 1, No 1 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.1.2008.22

Abstract

The research has been done to study the effect of cyanide concentration on gold production. There are three step to produced gold. First is repulper, second is leaching and the last is burning. The result show that concentration of cyanide give effect in gold production. Cyanide with 100 ppm significantly different compared with cyanide with 200, 400 and 600 ppm in gold recovery. Based on statistical analysis, cyanide with 400 ppm is the best concentration in gold production.
DETOKSIFIKASI SIANIDA PADA TAILING TAMBANG EMAS DENGAN NATRIUM METABISULFIT (Na2S2O5) DAN HIDROGEN PEROKSIDA (H2O2) Pitoi, Mariska Margaret; Wuntu, Audy D.; Koleangan, Harry S. J.
CHEMISTRY PROGRESS Vol 1, No 1 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.1.2008.23

Abstract

Experiments have been made to test the performance of Na2S2O5 and Cu’s method, H2O2’s method, and H2O2 and Cu’s method in cyanide detoxification in gold mining tailing with the varying theoretic concentration of the reagent was 100 %, 200 %, 300 %, 500 %, 750 %, and 1000 %. Tailing that used was taken from one of the people mining which used cyanide. It was treated with the three methods and six theoretic concentrations for four hours on magnetic stirrer. The result showed that Na2S2O5 and Cu’s method gave significant difference for CN free and CN WAD detoxification better than H2O2’s method and H2O2 and Cu’s method, whereas H2O2 and Cu’s method gave significant difference for CN free detoxification better than H2O2’s method but not for CN WAD detoxification. Theoretic concentration 750 % gave the best detoxification result but it was not have significant difference with 500 %, 300 %, and 200 % for CN free and 1000 %, 500 %, 300 %, and 200 % for CN WAD, so theoretic concentration 200 % was the economic considerations choice.
PENGARUH PENAMBAHAN ASAM SUKSINAT DALAM MENGHAMBAT KOROSI BAJA DALAM LARUTAN ASAM SULFAT Gusti, Diah Riski; Aritonang, Henry F.; Azis, Sriwati
CHEMISTRY PROGRESS Vol 1, No 1 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.1.2008.24

Abstract

The objectives of this research were study the effect of addition succinic acid on inhibiting of stainless steel corrosion in sulfuric acid solution. The stainless steel sample sieved and macerated in sulfuric acid solution with concentration of 0.01; 0.02; 0.03; 0.04 and 0.05 M for 24, 48 and 72 hours. The corrosion rate and inhibitor efficiency were evaluated with Asdim and Widharto method. The result showed that corrosion rate of with different concentration higher with increasing of concentration of sulfuric acid. The corrosion rate of stainless steel was higher of 0.3716 mg/cm2 hours at concentration of 0.05 M. However, the addition of succinic acid with different concentration of 1 x 10-3; 2 x 10-3; 4 x ; 4 x 10-3 ; 5 x 10-3 M, relative corrosion rate gave lower. The inhibitor efficiency in succinic acid was 60.60% at concentration 5 x 10-3 for 24 hours. It is concluded that succinic acid having inhibition effect on stainless steel corrosion.
KAJIAN STABILITAS TERMAL DAN KARAKTER KOVALEN ZAT PENGAKTIF PADA ARANG AKTIF LIMBAH GERGAJIAN KAYU MERANTI (Shorea spp) Koleangan, Harry S. J.; Wuntu, Audy D.
CHEMISTRY PROGRESS Vol 1, No 1 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.1.2008.25

Abstract

A research considering the role of thermal stability and covalent character of activating agent on meranti timber sawmill-waste activated carbon using H3PO4 and CaCl2 as activating agents had been conducted. The result showed that activating agent having better higher covalent character yielded highest-adsorption activated carbon.
ANALISIS FITOKIMIA TUMBUHAN OBAT DI KABUPATEN MINAHASA UTARA Makang, Veronica M. A.; Simbala, Henry E. I.; Runtuwene, Max R. J.; Sangi, Meiske
CHEMISTRY PROGRESS Vol 1, No 1 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.1.2008.26

Abstract

A research has been done to analyze the phytochemical of medicine plant used by North Minahasa society. The research done qualitatively to know the present of alkaloid component, flavonoid, triterpenoid, steroid, saponin, and tannin. Analyzes of alkaloid component using Mayer, Dragendorff and Wagner reagents showed presipitate when react with alkaloid. Mayer reagent showed white presipitate, Dragendorff reagent showed red-orange presipitate and Wagner reagen showed brown presipitate. In flavonoid analysis, positive result indicated with red solution. Saponim analysis indicated with a stable foam. Tannins analysis indicated with green and blue-black solution and triterpenoid analysis indicated with red-orange or purple solution. Although the steroida analysis indicated with blue solution. The result show that 46 samples from 46 spesies of medicine plant that had been analyzed are 97,83% positive containing alkaloid component; 13,04% containing triterpenoid; 28,26% containing steroid; 47,83% containing flavonoid; 63,04% containing saponin and 63,44% containing tannin.
PENGARUH ADSORBEN TERHADAP AKTIVITAS ANTIOKSIDAN DARI ASAP CAIR KAYU CEMPAKA (Michelia champaka Linn) Katja, Dewa Gede; Suryanto, Edi; Momuat, Lidya I.; Tambunan, Yenny
CHEMISTRY PROGRESS Vol 1, No 1 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.1.2008.27

Abstract

The objective of this study was to determine the effects of adsorbent on antioxidant activity of liquid smoke from champaka wood. The adsorbent was used as active carbon, silica gel and alumina. Concentration of adsorbent were added to liquid smoke fro 1-5%. Antioxidant activity of liquid smoke was evaluated in 1.1-diphenyl-2-picrylhydrazyl (DDPH) radical test. The liquid smoke was treated with third adsorbent in agitation for 15, 30 and 45 minutes. The effect of active carbon showed the highest scavenging activity in DPPH radical followed alumina and silica gel. This result showed that active carbon effect at concentration of 3 and 5% had highest antioxidant activity than alumina and silica gel for 45 and 60 minutes. This research concluded that active carbon could be increase antioxidant activity of liquid smoke.
KUALITAS VIRGIN COCONUT OIL DARI BEBERAPA METODE PEMBUATAN Pontoh, Julius; Surbakti, Mariana Br.; Papilaya, Mayz
CHEMISTRY PROGRESS Vol 1, No 1 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.1.2008.28

Abstract

A research had been conducted to study the quality of Virgin Coconut Oils (VCOs) by various processing methods including step-wise heating, oil addition, and fermentation. Various parameters were measured to study the quality of VCOs from three processing methods including oil content, water content, free fatty acids content and peroxide value. The collected data was analyzed statistically following the analysis of variance (ANOVA) followed by the Least Significant Difference (LSD)Test. The results showed that the highest oil content was found from the VCO processed by oil addition method but did not significantly different with that processed by step-wise heating and fermentation methods. The highest water content was found from VCO processed by step wise heating, but not significantly different with that processed by fermentation. The lowest free fatty acid content was found from VCO processed by stepwise heating, and significantly different with that from VCO processed by fermentation, but not significantl different with that from VCO processed by oil addition. The lowest peroxide value was found from VCO processed by fermentation, but not different to that from VCO processed by both stepwise heating and oil addition. Stepwise heating produced VCO with very hight quality followed by VCO processed by oil addition. Fermentation method produced VCO with very low quality.

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