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INDONESIA
CHEMISTRY PROGRESS
Published by Universitas Sam Ratulangi
ISSN : 19795920     EISSN : 27158365     DOI : -
Core Subject : Science,
Chemistry
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 9 Documents
 1 
Search results for , issue "Vol 1, No 2 (2008)" : 9 Documents clear
PENGARUH pH TERHADAP STABILITAS OKSIDATIF DAN EFEKTIVITAS ANTIOKSIDAN DALAM SISTEM EMULSI Fatimah, Feti
CHEMISTRY PROGRESS Vol 1, No 2 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.2.2008.4957

Abstract

The oxidation of lipids in emulsified form is more complex than that in bulk lipid. In Emulsion form, thereare more variables influencing lipid oxidation, including oil proportion, type and concentration of emulsifier,pH and buffer system. The aims of this research were to study the effect of pH on oxidative stability andeffectiveness of antioxidants of emulsion system. The oxidative stability and antioxidants effectiveness inthis system were determined by hydroxyperoxydes content. The result showed that reduction pH from 5,7to 3,7 could reduce its oxidative stability. The pKa of antioxidants also influenced their effectiveness on theemulsion system Keywords: oxidative stability, antioxidant, emulsion, pH, hydroxyperoxydes
KIMIA OKSIGEN SINGLET: SENSITISER, CAHAYA DAN REAKTIVITASNYA TERHADAP ASAM LEMAK TAK JENUH Suryanto, Edi
CHEMISTRY PROGRESS Vol 1, No 2 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.2.2008.4962

Abstract

Singlet oxygen chemistry and photooxidation reaction, in general, often require one or more criticalreaction steps that involve a sensitizer and light for photochemistry production of singlet oxygen from atriplet state. Singlet oxygen can be formed chemically, enzimatically, and photochemically. However, themost well documented formation mechanism for singlet oxygen is photochemistry using sensitizers.Chlorophyll, riboflavin, myoglobin, porphyrins, erythrosine, rose bengal, methylene blue, bilirubin andretinal are well-known photosensitizer and can absorb energy from light and transfer it to triplet oxygen toform singlet oxygen. Photooxidation provides an important way to produced hydroperoxides fromunsaturated fatty acids in presence of oxygen, light energy and photosensitizer. Hydroperoxide are themajor initiation products of lipid oxidation chain reactions. Singlet oxygen participated in the initiation stepof oil oxidation and the reaction rate of singlet oxygen with oleic, linoleic acid and linolenic are about30.000, 1450 and 900 times greater than that of triplet oxygen. Therefore, this review discusses twoimportant singlet oxygen mechanisms, the formation of singlet oxygen and double bond reaction inunsaturated fatty acid system Key word: Singlet oxygen, sensitizer, unsaturated fatty acids, hydroperoxides
ADSORPSI ASETON, BENZENA, DAN TOLUENA PADA KARBON AKTIF TEMPURUNG KELAPA SEBAGAI PEMBERSIH UDARA RUANG TERTUTUP Wuntu, Audy
CHEMISTRY PROGRESS Vol 1, No 2 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.2.2008.4953

Abstract

Adsorption of air pollutant volatile organic compounds, those are acetone, benzene, and toluene onactivated carbon prepared from coconut shell had been studied. The research was aimed to explore theadsorption capacity and adsorption energy of the compounds on coconut shell activated carbon understatic condition. In this condition, the adsorbent was stayed for 24 hours inside a closed bin containingsingle gas: actone, benzene, or toluene. The result showed that the adsorption capacity of thesecompounds on activated carbon was in the order of acetone > benzene > toluene. The same order wasobserved for the parameter of adsorption energy of the compounds on activated carbon Keywords: adsorption, adsorbent, activated carbon, coconut shell
ANTI-PHOTOOXIDATIVE EFFECT OF PHENOLIC EXTRACT FROM CLOVE PARASITE (Flower) IN SYSTEM MODEL Wehantouw, Frenly
CHEMISTRY PROGRESS Vol 1, No 2 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.2.2008.4958

Abstract

Clove parasite is a herbal plant commonly used in north sulawesi. Its traditionally used to cure many kindof disease, especially cancer. The objectives of this study was to determine antiphotooxidation activities ofclove parasite flower on linoleic acid 0,03 M under illuminate with 4000 lux fluoresence lamp for 5 hours.Analyses of antiphotooxidation activities based on Lee et al. (1997) method and analyses of rancidity oflinoleic acid was determine with AOCS 1990 methods. The addition of clove parasite flower extracts in thereaction mixture showed antiphotooxidation activities on linoleic acid 0,03 M. The mixture with extractshow lower peroxide value compare with control without extract after 5 hours light exposure at roomtemperature. Activities as antiphotooxidation of clove parasite extract may cause by phenolic compoundon this plant Keywords: clove parasite, linoleic acid, antiphotooxdation, peroxide value
ANALISIS LOGAM BERAT MERKURI (HG) PADA GASTROPODA, LUMPUR DAN AIR DI TELUK AMURANG KABUPATEN MINAHASA SELATAN Kiwol, Christy
CHEMISTRY PROGRESS Vol 1, No 2 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.2.2008.4954

Abstract

The purpose of this study is to know the ?Concentration of Heavy Metal Mercury in Gastropods, Sedimentand Sea water at Amurang Bay. As the concentration of these heavy metals in living things (gastropod),sediment, and sea water being figured up that it will be known the level of heavy metal contaminant inAmurang Bay. This study was approached by purposive sampling method and Atomic AbsorptionSpectrophotometer (AAS) of the Laboratory of Balai Riset dan Standarisasi Industri dan Perdagangan(BARISTAND) used to analyze the sample. The result has been showed that the concentration of Mercury(Hg) that found in sea water, sediment and gastropod from Amurang Bay were in the range between 0,04? 0,82 ppm, 19,61 ? 39,63 ppm and 14,67 ? 23,89 respectively. Based on Environment Quality Standardreference the Mercury (Hg) concentration that has been found in this study from Amurang Bay beingunder safety limit level. Keywords : heavy metal, mercury, sea water, sediment, gastropod
ANALISIS KUALITAS AIR SUNGAI TANOYAN DI KOTA KOTAMOBAGU PROVINSI SULAWESI UTARA Abidjulu, Jemmy
CHEMISTRY PROGRESS Vol 1, No 2 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.2.2008.4960

Abstract

A research has been done about the quality of water from Tonayan river in Kotamobagu city Province ofNorth Sulawesi based on its physics and chemical parameter. The sample was taken on three spot withduplo methods. The first sample was undertaken on the upperstream at Tanoyan village, second wasundertaken on the downstream at Mopait village and the third was undertaken at Kopandakan village.Analysis of water using Turbiditimetry, pH-metri, EDTA, and Spectrophotometer methods. The resultthat had been obtained was compared with the standart of pure water class II based on the governmentrules No.82 year 2001. Based on the research result, the quality of river water at the three spot are: notaste, no flavor, turbidymetry ( 3,1-9 NTU), pH (6,5-7,9), saturated (440-560 mg/1), chloride (0,02-21,02mg/L), ferrum (<0,01-0,036 mg/L), mangannese (0,02-0,071 mg/L), nitrat (<0,5 mg/L), seng (0,02-0,215mg/L), cyanide (0,11-0,01 mg/L), dan sulphat (2-71 mg/L). This research conclude that water inTonayan river Kotamobagu city Province of North Sulawesi for all parameters are in standart quality,accept saturated at first spot and zinc at the third spot Keywords: Quality, water, river, physics parameter, chemical parameter
LAJU KOROSI DALAM LARUTAN ASAM SULFAT DENGAN MENGGUNAKAN INHIBITOR ASAM OKSALAT Rizki, Diah
CHEMISTRY PROGRESS Vol 1, No 2 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.2.2008.4956

Abstract

The objectives of this research were study the effect of addition oxalat acid on inhibiting of stainless steelcorrosion in sulfuric acid solution. The stainless steel sample sieved and macerated in sulfuric acidsolution with concentration 0.05 M for 24, 48 and 72 hours. The corrosion rate are evaluated with Asdimof method. The result showed that corrosion rate of stainless steel in sulfuric acid for 72 hour is 0,1309mg/ cm2jam. The corrotion rate rate of stainless steel in sulfuric acid with addition axalat acid inhibitor withconcentracion 1.10-3M , 2.10-3M , 3.10-3M , 4.10-3M for 72 jam were 0,0157 , 0,0188, 0,017 , and 0,0165mg/cm2hour. . It is concluded thatoxalat acid having inhibition effect on stainless steel corrosion Keywords: oxalate acid, stainless steel, corrosion, sulphuric acid
UJI AKTIVITAS ANTIOKSIDAN DARI DAUN CENGKEH (Eugenia Carryophyllus) DENGAN METODE DPPH Rorong, Johnly
CHEMISTRY PROGRESS Vol 1, No 2 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.2.2008.4961

Abstract

Clove (Eugenia carryophyllus) is a traditional food ingredient characterized by its specific and refreshingaroma. This study was intended to determine the antioxidative effects of clove leaves. Clove leaves wasextracted sequentially with hexane, methanol and ethanol. The antioxidative effects of the extracts weredetermined by 1,1-diphenyl-2-picrylhydrazyl (DPPH) scavenging and reducing power assay. Total phenoliccontent of ESME extracts the highest compared with EHS and EEM were 0,851; 1,8575 and 1,237 mg/kgrespectively, which expressed as gallic acid equivalent. The addition of methanol extracts of clove leavesin the reaction mixture showed the highest scavenging activity in 1,1-diphenyl-2-picrylhydrazyl (DPPH)radical and reducing power. These results suggest that the ethanolic extract of clove leaves containscompounds having antioxidative activities Keywords : clove, autooxidation, photooxidation, solvent extraction, DPPH
ANALISIS KANDUNGAN FITOKIMIA DAN AKTIVITAS PENSTABIL OKSIGEN SINGLET DARI DAUN KELAPA Katja, Dewa
CHEMISTRY PROGRESS Vol 1, No 2 (2008)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.1.2.2008.4955

Abstract

The objectives of study was to determine phytochemicals content and singlet oxygen quencher (SOQ)activities examination in 2 type (DMA and GKN) of coconut leave. Analyses of phytochemicals based ontotal phenolic, flavonoid and condensed tannins. To detect the involment of singlet oxygen inphotodegradation 5 ppm erythrosine solution containing 2 types of extracts were exposed under 4000 luxfluorescent light for up to 5 hours. The result showed that coconut leave of DMA type possessed totalphenolic, flavonoid and tannin content were 149.27; 3725 and 1822 mg/kg, whereas for type of GKN was138.73; 4625 and 2110.81 mg/kg, respectively. The DMA leave exhibited the highest singlet oxygenquenching activities compared by GKN leaves. The results also indicated that concentration of both theextracts increased with increasing. The results also indicated that concentration of both the extractsincreased with increasing singlet oxygen quenching activities. These result suggested that phenoliccompounds groups having singlet oxygen quenching activities Keywords: phenolics, coconut leave extract, singlet oxygen quenching

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