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All Journal VALENSI Jurnal Kimia (Journal of Chemistry) Jurnal MIPA CHEMISTRY PROGRESS agriTECH Molekul: Jurnal Ilmiah Kimia The Studies of Social Sciences Makara Journal of Science Molekul: Jurnal Ilmiah Kimia
Dewa Gede Katja
Jurusan Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam Universitas Sam Ratulangi, Kampus Unsrat, Bahu Manado 95115
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Environmental Science Materials Science & Nanotechnology Mathematics Physics Social Sciences

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POTENSI DAUN ALPUKAT (Persea Americana Mill) SEBAGAI SUMBER ANTIOKSIDAN ALAMI Katja, Dewa Gede; Suryanto, Edi; Wehantouw, Frenly
CHEMISTRY PROGRESS Vol 2, No 1 (2009)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.2.1.2009.65

Abstract

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EFEK PENSTABIL OKSIGEN SINGLET EKSTRAK PEWARNA DARI DAUN BAYAM TERHADAP FOTOOKSIDASI ASAM LINOLEAT, PROTEIN DAN VITAMIN C Katja, Dewa
CHEMISTRY PROGRESS Vol 2, No 2 (2009)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.2.2.2009.4965

Abstract

The objective of this research was to determine singlet oxygen quenching (SOQ) effects of colorantextracts of spinach leave on erythrosine-sensitized photooxidation of linoleic acid, protein and vitamine C.Spinach leave was extracted with water, ethanol 40%, 60% and 80% for 30 minutes. Analyses ofantioxidant phytochemicals were based on total phenolic and flavonoid contents. The extracts of spinachleaf evaluated singlet oxygen quenching effect using linoleic acid, protein and vitamine C as substrates eachcontaining 5 ppm erythrosine was exposed under fluorescent light (4000 lux). Extraction with ethanol 40%showed the highest yield of extract, followed with ethanol 60%, water and ethanol 80%. The result showedthat solvent was significantly have an effect on total phenolic content, which ethanol 60% extract was thehighest, followed with 80 and 40% ethanol extracts and water extract. Contrary, ethanol 40%, extractpossessed highest total flavonoid content than water extract, ethanol 60% and ethanol 80% extract.Futhermore, the result determined SOQ, water extract possessed highest SOQ compared with ethanol40%, 60% and 80% in photooxidation of linoleic acid system. However, ethanol extract 40% and ethanolextract 60% showed that highest activity than ethanol extract 80% and water extract in photoxidation ofprotein system whereas in photooxidation of vitamin C system, ethanol extract 60% showed higest activitycompared with etnanol extract 80, ethanol extract 40% and water. It is concluded that colorant extract ofspinach leave showing singlet oxygen quenching effect was a component having phenolic group Keywords : color, phenolic extract, spinach leaves, singlet oxygen quenching
ISOLASI CAPSAICIN DARI OLEORESIN CABAI RAWIT Thaib, Novita; Katja, Dewa Gede; Aritonang, Henry Fonda
CHEMISTRY PROGRESS Vol 8, No 2 (2015)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.8.2.2015.13266

Abstract

This study aims to isolate the capsaicin of cayenne pepper oleoresin by extraction method. The results obtained as much as 0.5 g (0.5%) products of 100 g of dried cayenne pepper. Product is colorless crystalline solid (clear), a melting point of 66 oC and a refractive index of 1.4694. Crystals were analyzed with an infrared spectrophotometer (IR), namely the OH group (3409.9 cm-1 and 1026.1 cm-1), NH stretching and bending (3278.8 cm-1, 1515.9 cm-1 and 920 cm-1) which is a secondary amide, C=C (1643.2 cm-1), CH stretching from CH3 and CH2 (2927.7 cm-1 and 2854.5 cm-1) and CH bending of CH2 and CH3 (1461.9 cm-1 and 1377.1 cm-1), C=O (1747.4 cm-1) and group O-CH3 asymmetric and symmetric (1253.6 cm-1 and 1164.9 cm-1).Penelitian ini bertujuan untuk mengisolasi capsaicin dari oleoresin cabai rawit metode refluks menggunakan pelarut kloroform. Hasil yang diperoleh sebanyak 0,5 g (0,5 %) produk dari 100 g cabai rawit kering. Produk berupa padatan kristal tak berwarna (bening), titik leleh 66 dan indeks bias 1,4694. Kristal yang diperoleh dianalisis dengan spektrofotometer infra merah (IR), yaitu adanya gugus OH (3409,9 cm-1 dan 1026,1 cm-1), NH stretching dan bending (3278,8 cm-1, 1515,9 cm-1 dan 920 cm-1) yang merupakan suatu amida sekunder, C=C (1643,2 cm-1), CH stretching dari CH3 dan CH2 (2927,7 cm-1 dan 2854,5 cm-1) dan CH bending dari CH2 dan CH3 (1461,9 cm-1 dan 1377,1 cm-1), C=O (1747,4 cm-1) serta gugus O-CH3 asimetrik dan simetrik (1253,6 cm-1 dan 1164,9 cm-1).
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.
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
Singlet Oxygen Quenching Activities Of Phenolic Extract From Lemon Grass Leaves (Cymbopogon citratus Stapf) Suryanto, Edi; Katja, Dewa Gede; Wehantouw, Frenly
CHEMISTRY PROGRESS Vol 3, No 1 (2010)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.3.1.2010.67

Abstract

Lemon grass (Cymbopogon citratus Stapf) is a traditional food ingredient characterized by its specific andrefreshing aroma. This objectives of study was determined phytochemical contents and the effect of lemongrass leaves extract in photooxidation linoleic acid and ascorbic acid in system model. Lemon grass leaves wasextracted sequentially with hexane and methanol. The photooxidation reaction system was consisted of linoleicacid 0.03 M in ethanol containing 0.017 mM erythrosine as sensitizer the reaction mixture was exposed under4000 lux fluorescent light up to 5 hours while ascorbic acid 200 μg/mL in phospat buffer solution (pH 7.5)containing 0.0068 mM erythrosine as sensitizer illuminated for 20 minutes. Analyses of phytochemical based ontotal phenolic and flavonoid. Analyses of photooxidation of linoleic acid based on peroxide value anddegradation of ascorbic acid was analyzed using the spectrophotometer at λ 265 nm. The total phenolic andflavonoid content in hexane extract showed the highest phenolic content than methanol extract. Hexane extract1500 ppm exhibited singlet oxygen quenching effect on photooxidation linoleic acid compared with methanolextract, peroxide value 3.57 and 3.72 meq/kg after 5 hours illumination, respectively. Hexane extract 100 ppmalso exhibited singlet oxygen quenching effect on photooxidation ascorbic acid compared with methanol extract,ascorbic acid content 185.44 and 76.67 mg/kg after 5 hours illumination, respectively. It’s concluded thathexane extract of lemon grass leaves contain phenolic component that have singlet oxygen quencher activity.
UJI FITOKIMIA DAN TOKSISITAS DARI EKSTRAK DAUN CHISOCHETON SP. (C.DC) HARMS Junito, Junito; Katja, Dewa G.; Kamu, Vanda S.
CHEMISTRY PROGRESS Vol 11, No 2 (2018)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.11.2.2018.27944

Abstract

ABSTRAK Tanaman genus Chisocheton memiliki aktivitas antimalaria, antibakteri dan sitotoksik, yang dapat digunakan sebagai komponen senyawa bioaktif. Tujuan penelitian ini adalah untuk mengetahui hasil skrining fitokimia dan toksisitas dari ekstrak n-heksana, etil asetat dan metanol. Metode yang digunakan untuk skinning fitokimia yaitu menggunakan metode dari Harbone dan untuk metode yang digunakan untuk uji toksisitas yaitu menggunakan metode Brine Shrimp Lethality Test dari Meyer. Hasil penelitian ini menunjukan bahwa skrining fitokimia terhadap sampel ekstrak daun tumbuhan dari Chisocheton sp. (C.DC) Harms menunjukan bahwa sampel mengandung senyawa; alkaloid, saponin, steroid, flavonoid dan tanin. Konsentrasi ekstrak dalam media yang digunakan 50, 40, 30, 40, 20, 10 dan sebagai kontrol 0 ppm dengan masing-masing media diberikan 10 ekor larva dan pengulangan sebanyak dua kali. Kadar air yang terkandung dalam simplisia adalah 7.66%. Hasil uji ekstrak daun Chisocheton sp. (C.DC) Harms bersifat toksik dengan nilai LC50 12.42 ppm untuk ekstrak n-heksana, LC50 23.75 ppm untuk ekstrak etil asetat, dan LC50 93.57 ppm untuk ekstrak metanol.  ABSTRACT The Chisocheton genus has antimalarial, antibacterial and cytotoxic activity, which can be used as a component of bioactive compounds. The purpose of this study was to determine the results of phytochemical screening and toxicity of n-hexane, ethyl acetate and methanol extract. The method used for phytochemical skinning is using the method from Harbone and method for used the toxicity test using the Brine Shrimp Lethality Test method from Meyer. The results of this study indicate that phytochemical screening of plant leaf extract samples from Chisocheton sp. (C.DC) Harms indicate that the sample contains compounds; alkaloids, saponins, steroids, flavonoids and tannins. The concentration of extracts in the media used was 50, 40, 30, 40, 20, 10 and as a control 0 ppm with each media given 10 larvae and repetition twice. The water content contained in simplicia is 7.66%. The results of the Chisocheton sp. Leaf extract test. (C.DC) Harms are toxic with LC50 value of 12.42 ppm for n-hexane extract, LC50 23.75 ppm for ethyl acetate extract, and LC50 93.57 ppm for methanol extract.
AKTIVITAS ANTIFOTOOKSIDASI DAN FOTOPROTEKSI FRAKSI PELARUT DARI DAUN GEDI (Abelmuschus manihot L) Abigael, Reliana; Suryanto, Edi; Katja, Dewa G.
CHEMISTRY PROGRESS Vol 12, No 1 (2019)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.12.1.2019.27914

Abstract

ABSTRAK Penelitian ini bertujuan untuk menentukan aktivitas antifotoksidasi mengukur nilai SPF dari ekstrak metanol daun Gedi (Abelmoschus manihot L). Daun gedi diekstraksi dengan cara sokletasi.  Dalam penelitian ini sampel diekstraksi dengan pelarut metanol, difraksinasi dengan pelarut petroleum eter, etil asetat, butanol dan akuades. Dari hasil fraksinasi tersebut kemudian diuji aktivitas antifotooksidasi dan fotoprotektif. Kandungan fenolik menggunakan asam galat sebagai larutan standart. Uji Aktivitas antifotooksidasi ditentukan dengan menghitung nilai diena terkojugasi yang merupakan pembentukan awal oksidasi pada lipid. Semakin rendah nila diena terkonjugasi, maka semakin baik sebagai antifotooksidasi. Untuk penentuan fotoprotektif, dilakukan dengan mneggunakan spektrofotometer UV-Vis pada panjang gelombang 290-320 nm dengan konsentrasi 100 μg/mL. Hasil penelitian ini menunjukkan bahwa fraksi etil asetat memiliki kandungan fenolik, aktivitas antioksidan, antifotooksidasi, dan fotoprotektif yang paling tinggi. Hasil yang diperoleh menunjukkan total fenol paling tinggi pada fraksi eti asetat yaitu 110.204 µg/mL, sedangkan untuk aktivitas antioksidan 57.72%. Hasil pada aktivitas antifotooksidasi menunjukkan bahwa fraksi Etil asetat menunjukkan kemampuan yang paling baik dan untuk fotoprotektik memiliki nilai SPF yang tinggi adalah etil asetat yaitu 9.03.  ABSTRACT This study aimed to determine the antifotoxidation activity measuring the SPF value of the solvent fraction of the leaves of Gedi (Abelmoschus manihot L). Gedi leaves extracted by socletation. In this study the samples were extracted with methanol solvent, fractionated with petroleum ether, ethyl acetate, butanol and aquades. The results of the fractionation were then tested for antifotooxidation and photoprotective activity. Phenolic content uses gallic acid as a standard solution. The antifotoxidation activity test is determined by calculating the conjugated diene value which is the initial formation of oxidation in the lipid. The lower the conjugated diene tilapia, the better it is antifotoxidation. For photoprotective determination, a UV-Vis spectrophotometer was carried out at a wavelength of 290-320 nm with a concentration of 100 μg / mL. The results of this study indicate that the highest ethyl acetate fraction has the highest phenolic content, antioxidant activity, antifotoxidation and photoprotective. The results obtained showed the highest total phenol in the eti acetate fraction of 110,204 µg / mL, while for antioxidant activity 57.72%. The results of the anti photoxidation activity showed that the ethyl acetate fraction showed the best ability and for the photoprotectic the high SPF value was ethyl acetate namely 9.03.  
FITOKIMIA DAN AKTIVITAS ANTIOKSIDAN EKSTRAK KULIT BATANG Chisocheton sp. (C.DC) Harms (Meliaceae) Katja, Dewa Gede
CHEMISTRY PROGRESS Vol 13, No 2 (2020)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.13.2.2020.31672

Abstract

Tujuan penelitian ini untuk mengetahui golongan senyawa metabolit sekunder dan aktivitas antioksidan dari setiap ekstrak kulit batang Chisocheton sp. C.DC Harms (Meliaceae). Hasil ekstraksi 200 g serbuk kulit batang Chisocheton sp. C.DC Harms (Meliaceae) dengan n-heksana, etil asetat dan metanol masing-masing dengan 2000 mL berturut-turut menghasilkan 7,193 g ekstrak pekat n-heksana, 8,798 g ekstrak pekat etil asetat dan 18,683 g ekstrak pekat metanol. Hasil uji fitokimia menunjukkan adanya golongan senyawa flavonoid, triterpenoid dan tanin. Hasil uji aktivitas antioksidan dengan metode DPPH menunjukkan bahwa ekstrak n-heksana memberikan nilai IC50 sebesar 337,28 µg/mL, ekstrak metanol sebesar 216,73 µg/mL, dan ekstrak etil asetat sebesar 199,89 µg/mL yang berarti etil asetat memiliki kemampuan yang paling besar dalam menangkap radikal bebas.ABSTRACTThe objective of this study was determine the class of secondary metabolite compounds and antioxidant activity of each stem bark extract of Chisocheton sp. C.DC Harms (Meliaceae). The results of the extraction of 200 g Chisocheton sp. C.DC Harms (Meliaceae) with n-hexane, ethyl acetate and methanol with 2000 mL each yielded 7,193 g of concentrated extract n-hexane, 8,798 g of concentrated extract of ethyl acetate and 18,683 g of concentrated methanol extract. Phytochemical test results showed the presence of flavonoid, triterpenoid and tannin compounds. The results of the antioxidant activity test using the DPPH method showed that the n-hexane extract gave an IC50 value of 337,28 µg/mL, methanol extract was 216,73 µg/mL, and ethyl acetate extract was 199,89 µg/mL which means that ethyl acetate has the ability to greatest in capturing free radicals.
SENYAWA STIGMASTEROL (STEROID) DARI KULIT BATANG Chisocheton celebicus koord (MELIACEAE) Katja, Dewa Gede
CHEMISTRY PROGRESS Vol 14, No 1 (2021)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.14.1.2021.34154

Abstract

ABSRTAKStigmasterol (suatu steroid) dengan rumus molekul C29H48O  telah doiisolasi dari kulit batang chisocheton celebicus (Meliacea) menggunakan pelarut n-heksan, kemudian dipisahkan dengan teknik kromatografi dan dihasilkan isolat murni berupa kristal jarum tak berwarna(10,2 mg) dengan titik leleh 169-1710C. Struktur kimia stigmasterol diidentifikasi berdasarkan data-data spektroskopi meliputi IR, NMR-1D, NMR-2D dan masa,serta perbandingan dengan data spektroskopi yang diperoleh dari literatur. Penemuan senyawa stigmasterol dari kulit batang Chisocheton celebicus dilaporkan untuk pertama kalinya dalam penelitian ini.. ABSTRACTStigmasterol C29H48O has been isolated from the bark of Chisocheton celebicus (Meliacee) in n-hexan and separated using several chromatography and it has been pure isolated the crystal calorness compound (10,2 mg). The chemical structure of isolated compound was identified on the basis of spectroscopic data including IR, 1D-NMR, 2D-NMR and mass along with comparison with those spectral data previously reported. The discovery of stigmasterol compound from the bark C. celebicus reported for the first time in this study.
Co-Authors Abigael, Reliana Ace Tatang Hidayat Ahmad Darmawan Andre A. Sonda Ba'u, Defrikson Desi Harneti Putri Huspa Edi Suryanto Edi Suryanto Erwin Sitorus Euis Julaeha Farabi, Kindi Ferry Ferdiansyah Sofian, Ferry Ferdiansyah Frenly Wehantouw Harry S. J. Koleangan Henry Aritonang Hilmayanti, Erina Johnly A Rorong Johnly A. Rorong Junito, Junito Khalijah Awang Khlaijah Awang Kindi Farabi Kindi Farabi Kindi Farabi Koleangan, Harry Steven Julius Lidya I. Momuat Lidya Irma Momuat Mantiri, Sisilia A Max R.J Runtuwene Max Revolta John Runtuwene Meiske S. Sangi Naini, Al Arofatus Novita Thaib, Novita Nur Insani Amir Nurlelasari Nurlelasari Paulina yamlean Pettanaga, Putri Firania Pollo, Hard Napoleon Rani Maharani Rani Maharani Salim, Muhammad Fajrin Saranaung, Andika Sari, Aprilia Permata Sinaga, Jonathan Cavin Ezra Sinaga, Siska Elisahbet Sofa Fajriah Sofa Fajriah Stevi G. Dungir Sujana, Kinaya Vizria Tri Mayanti Tri Mayanti Tri Mayanti Tri Mayanti Tri Mayanti Unang Supratman Vanda S Kamu Vanda S. Kamu Vanda Selvana Kamu Yenny Tambunan Yoshihito Shiono Yoshihito Shiono