scholarly journals Aktivitas Antioksidan dan Total Polisakarida Ekstrak Rumput Laut Merah, Hijau dan Coklat dari Pantai Jangkar Situbondo

2019 ◽  
Vol 16 (2) ◽  
pp. 64
Author(s):  
Didin Erma Indahyani ◽  
Depi Praharani ◽  
Izzata Barid ◽  
Ari Tri Wanodyo Handayani
Keyword(s):  
Antioxidant Activity ◽  
Brown Seaweed ◽  
Water Extract ◽  
Ethanol Extract ◽  
Extraction Methods ◽  
Red Seaweed ◽  
Water Extracts ◽  
High Antioxidant Activity ◽  
Polysaccharide Composition ◽  
Ethanol Extracts

The antioxidant activity and polysaccharide composition of seaweed is influenced by species (red, green and brown seaweed), geographical conditions, extraction methods, solvents, temperature and the length of time of extraction. The purpose of this study was to known the total polysaccharide and antioxidant activity in red, green and brown seaweed extracts from Jangkar Situbondo beach. Method. The study was conducted on red, green and brown seaweed extracted with ethanol and water to determine total polysaccharides. Antioxidant analysis uses the method 2,2-diphenyl1-picrylhydrazyl (DPPH) radical. Total polysaccharide and antioxidant activity were observed statistically using two-way ANOVA. The results of this study show that the polysaccharide content in seaweed water extract was significantly higher than ethanol extract, especially in brown seaweed. Seaweed water extracts showed higher antioxidant activity than ethanol extracts. The antioxidant activity of brown seaweed was significantly higher than that of green and red seaweed. Conclusion. Seaweeds have high antioxidant activity in water extracts. Brown seaweed water extract contains high polysaccharides than green and red seaweed. Antioxidant activity in brown seaweed is also higher than in green and red seaweed.

scholarly journals UJI AKTIVITAS ANTIOKSIDAN SPONS Stylissa sp. DENGAN MENGGUNAKAN METODE DPPH (1,1-difenil-2-pikrilhidrazil)

PHARMACON ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 419
Author(s):  
Samuel I.M. Sibarani ◽  
Adithya Yudistira ◽  
Deby A. Mpila
Keyword(s):  
Antioxidant Activity ◽  
Cell Wall ◽  
Free Radicals ◽  
Ethanol Extract ◽  
Dna Bases ◽  
Oxidation Reactions ◽  
Terrestrial Plants ◽  
Dpph Method ◽  
High Antioxidant Activity ◽  
Ethanol Extracts

ABSTRACTHabitat of sponge Stylissa sp., were under the sea and these sponges contain active compounds, which are more active than the compounds produced by terrestrial plants. Antioxidants are inhibitors of oxidation reactions due to the free radicals, which can cause weak damage to unsaturated cells, cell wall membranes, blood vessels, DNA bases, and lipid tissue, that causing disease. The study was conducted to determine the antioxidant activity of ethanol extracts  of sponge Stylissa sp., which is located on the Bangka Island, Likupang District, North Minahasa Regency. Sponge Stylissa sp., was extracted by maceration with using ethanol. Testing of antioxidant activity was carried out by the DPPH method measured by a UV-Vis spectrophotometer. The results of the study showed that ethanol extracts of sponge Stylissa sp., has antioxidant activity in each concentration and the highest at a concentration of 100 mg / L. The conclusion is a ethanol extract of sponge Stylissa sp. have high antioxidant activity with a concentration of 25 mg/L (77,40%), concentration of 50 mg/L (85,63%), concentration of 75 mg/L (88,66%), and concentration 100 mg/L (88,96%). Key words: Stylissa sp. Sponge, Antioxidant, DPPH (1,1-diphenyl-2-picrylhydrazyl) ABSTRAKHabitat dari spons Stylissa sp. terdapat di bawah laut dan spons ini mengandung senyawa aktif yang persentase keaktifannya lebih besar dibandingkan dengan senyawa-senyawa yang dihasilkan oleh tumbuhan darat. Antioksidan adalah zat penghambat reaksi oksidasi akibat radikal bebas yang dapat menyebabkan kerusakan lemah tak jenuh, membran dinding sel, pembuluh darah, basa DNA, dan jaringan lipid sehingga menimbulkan penyakit. Penelitian dilakukan untuk mengetahui aktivitas antioksidan ekstrak etanol biota laut spons Stylissa sp. yang terdapat di pulau Bangka, Kecamatan Likupang, Kabupaten Minahasa Utara. Spons Stylissa sp. ini diekstrak dengan metode maserasi menggunakan etanol. Pengujian aktivitas antioksidan ini dilakukan dengan metode DPPH yang diukur dengan alat spektrofotometer UV-Vis. Hasil dari penelitian menunjukan bahwa ekstrak etanol spons Stylissa sp. memiliki aktivitas antioksidan disetiap konsentrasi dan yang tertinggi pada konsentrasi 100 mg/L. Kesimpulan yang didapat bahwa ekstrak etanol spons Stylissa sp. memiliki aktivitas antioksidan yang tinggi dengan konsentrasi 25 mg/L (77,40%), konsentrasi 50 mg/L (85,63%), konsentrasi 75 mg/L (88,66%), dan konsentrasi 100 mg/L (88,96%). Kata Kunci : Spons Stylissa sp., Antioksidan, DPPH (1,1-difenil-2-pikrilhidrazil)

scholarly journals AKTIVITAS ANTIOKSIDAN KECIBELING, BAKAU MERAH, DAN KATUK PADA METODE EKSTRAKSI DAN RASIO EKSTRAK YANG BERBEDA

2020 ◽  
Vol 31 (1) ◽  
pp. 1
Author(s):  
Lilik Sulastri ◽  
Ika Oktavia ◽  
Partomuan Simanjuntak
Keyword(s):  
Antioxidant Activity ◽  
Mesh Size ◽  
Ethanol Extract ◽  
Extraction Methods ◽  
Rhizophora Stylosa ◽  
Red Mangrove ◽  
Water Solvent ◽  
Radical Method ◽  
Infusion Method ◽  
Ethanol Extracts

<em></em><em><em>Indonesian medicinal plants, such as </em>Strobilanthes crispa<em> (L.) Blume (locally known as kecibeling), red mangrove (</em>Rhizophora stylosa<em> Griff.) and star gooseberry {</em>Sauropus androgynus<em> (L.) Merr.} contain active compounds that act as antioxidants. The study aimed to determine the effect of extraction methods (maceration and infusion) on the antioxidant activity of both single extract and  several combination ratios of the extracts mixture of kecibeling leaves, red mangrove leaves and star gooseberry stems. Dried powdered of the samples of a 40 mesh size were extracted using 96 % ethanol solvent (maceration method) and water solvent (infusion method). A single extract or a combination of the three-single extracts (1: 1: 1; 1: 1: 2; 1: 2: 1; and 2: 1: 1) were then evaluated for their antioxidant activity based on the free radical method 2,2-diphenyl-1-picrylhydrazyl (DPPH). In general, extraction method using ethanol (maceration) was better than water (infusion). Antioxidants activities from ethanol extracts of the kecibeling leaves showed the strongest activity with an inhibitory concentration (IC<sub>50</sub>) value of</em> <em>37.65 ppm than the infusion extracts. The combination of a single ethanol extract from the three plants at a ratio of 2: 1: 1 was synergistic, which indicated by its strongest antioxidant activity (IC<sub>50</sub> = 18.78 ppm).  However, it still below the antioxidant activity of vitamin C (IC<sub>50</sub> = 4.24 ppm). Ethanol extract of kecibeling leaves singly or combined with the ethanol extracts of red mangrove leaves and star gooseberry stems can be developed as a potential antioxidant.</em><br /></em>

scholarly journals The use of vyazolistnogo labaznik (Filipendula ulmaria (L.) Maxim) to increase the antioxidant activity of hepatoprotective collection of plant origin

2020 ◽  
Vol 61 (3) ◽  
pp. 112-119
Author(s):  
Anatoly A. Lapin ◽  
◽  
Valery N. Zelenkov ◽  
Keyword(s):  
Antioxidant Activity ◽  
Linear Equation ◽  
Linear Dependence ◽  
Water Extract ◽  
Plant Origin ◽  
Water Extracts ◽  
Filipendula Ulmaria ◽  
Total Antioxidant ◽  
High Antioxidant Activity ◽  
Confidence Value

Currently available on the pharmaceutical market drugs do not fully have high antioxidant activity, so the search for new means to prevent and eliminate liver damage is relevant. The purpose of this study was to evaluate the use of vyazolistnogo labaznik to increase the antioxidant activity of hepatoprotective collections of plant origin. Water extracts of hepatoprotective collection (GPS) have significant antioxidant activity, which is reflected by its linear dependence on the amount of GPS taken for extraction with a confidence value of approximation R2 of 0.989. Total antioxidant activity (TAA) the collection infusion increased from 0.690 to 4.883 g of rutin (Ru) per 1 dm3 when brewing from 5 g to 40 g of collection per 1 liter of boiling water, while the linear dependence twice reaches the plateau when the amount of collection taken for extraction is 10-12 g and 18-21 g, the TAA of GPS infusions was 1.35±0.004 and 2.26±0.11 g of Ru per 1 dm3. To increase the TAA of the water extract of GPS, an aqueous extract of dried flowers of elmberry (Filipendula ulmaria (L.) Maxim) was used, obtained in a similar way. The TAA of water extracts of GPS as the labasnik extract was added increased to its content of 30 % wt., and the effects of synergy (TAAexcess) – decreased to 0 (labasnik content of 35 % wt.), passing into antagonism according to the linear equation with a confidence value of approximation R2 0.981. Comparative tests of water extracts of laburnum flowers and GPS in closed containers for storing biological samples at a temperature of +5 °C in the refrigerator showed that the TAA of water extraction of laburnum flowers in g Ru by 1 dm3 from the number of days of its aging decreases according to the linear equation with the approximation confidence value R2 0.927, and GPS increases – R2 0.965.

scholarly journals Antioxidant Activity Test of Ethanol and Water Extracts of Celery (Apium graveolens L.)

2020 ◽  
Vol 9 (2) ◽  
pp. 93-101
Author(s):  
Nurmiati Nurmiati ◽  
Siti Nuryanti ◽  
Tahril Tahril
Keyword(s):  
Antioxidant Activity ◽  
Vitamin C ◽  
Water Extract ◽  
Ethanol Extract ◽  
Natural Antioxidants ◽  
Apium Graveolens ◽  
Antioxidant Power ◽  
Water Extracts ◽  
Activity Test ◽  
Ic50 Value

This study aimed to determine the antioxidant activity of ethanol and water extracts of celery (Apium graveolens L.). Antioxidant activity test in this study used DPPH (2,2-diphenyl-1-picrylhydrazine) as a source of free radicals and vitamin C as a positive control. The antioxidant activity of celery extracts was analyzed using a UV-VIS spectrophotometer. Celery powder was extracted by firstly the maceration method using different solvents (ethanol and water) and secondly with the decoction method using water solvents. Celery extract was tested for antioxidant activity with various concentrations of 20, 40, 60, and 80 ppm. The results obtained that water extract (maceration) had a very strong antioxidant power with 23.713 ppm of IC50 values, for ethanol extract (maceration) had a strong antioxidant power with 59.492 ppm of IC50 value, water extract (dekok) had also a very strong antioxidant with 77.446 ppm of IC50 value, and vitamin C had a very strong antioxidant power with 15.631 ppm of an IC50 value. Based on the IC50 value obtained, the water extract by the maceration method was very good to be used as a source of natural antioxidants, because it had a very strong antioxidant activity value which was equivalent to vitamin C.

scholarly journals hemical Composition and Biological Activity of Ixiolirion tataricum (Pall.) Schult. & Schult.f. var. tataricum.

2021 ◽  
Vol 1 (1-2) ◽  
pp. 27-34
Author(s):  
Serkan Yigitkan ◽  
Mehmet Akdeniz ◽  
İsmail Yener ◽  
Mehmet Firat ◽  
Kerem Senturk ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Human Life ◽  
Chemical Properties ◽  
Ethanol Extract ◽  
Quinic Acid ◽  
Total Phenolic ◽  
Aerial Parts ◽  
High Antioxidant Activity ◽  
Ethanol Extracts

The role of plants in human life and the importance of plants in the food, drug and cosmetics industry have been increasing nowadays. This study investigates biological and chemical properties of root, branch, leaf, flower and aerial ethanol extracts of Ixiolirion tataricum (Pall.) Schult. & Schult. f. var. tataricum species, consumed as food in the population. The chemical composition of the species has been determined by the LC-MS/MS by specifying total phenolic and flavonoid contents. Antioxidant activity, cholinesterase, urease, tyrosinase, elastase and collagenase inhibitory activities have also been studied. According to the results of LC-MS/MS, quinic acid, protocatechuic acid, p-coumaric acid, and rutin have been detected. The branch ethanol extract contained higher amounts of quininic acid (12.101 µg analyte/g extract) than extracts of leaves, flowers, roots and aerial parts. On the other hand, the leaves ethanol extract exhibited high antioxidant activity in all tests (ABTS: IC50= 57.47±0.86 µg/mL, CUPRAC: A0.5= 66.76±1.86, DPPH: IC50: 119.2±1.52). The species has the potential to be used in the food industry due to its high antioxidant capacity.

UJI IMUNOSTIMULATOR DARI KOMBINASI EKSTRAK ETANOL HERBA BINARA (ARTEMISIA VULGARIS LINN) DAN EKSTRAK ETANOL DAUN PUCUK MERAH (SYZYGIUM OLEANA) DENGAN METODE HIPERSENSITIVITAS TIPE LAMBAT PADA TIKUS JANTAN

2019 ◽  
Vol 1 (2) ◽  
pp. 22-26
Author(s):  
Romauli Anna Teresia Marbun ◽  
Aminah Syarifuddin ◽  
Montysory Silalahi ◽  
Radika Bella Fista Ginting
Keyword(s):  
Antioxidant Activity ◽  
Immune System ◽  
Secondary Metabolites ◽  
Ethanol Extract ◽  
Positive Control ◽  
Artemisia Vulgaris ◽  
Chemical Screening ◽  
Chemical Content ◽  
High Antioxidant Activity ◽  
New Treatments

Diseases mediated by the immune system are difficult problems to treat such as human immunodeficiency virus (HIV) and other lethal viruses. Infections that occur in normal people are generally brief and rarely leave permanent damage. Treatment of this disease requires an aggressive and innovative approach to the development of new treatments so that it requires the role of immunomodulators to improve the immune system. A substance that acts as an enhancer or immune enhancer can be obtained by using herbs that are efficacious as immunostimulants. One of the herbs used is herbal binara (Artemisia vulgaris L) which has been studied as a potential immunomodulator with high antioxidant activity. Previous research also stated that red shoots (Syzygium oleana) were studied as potential immunomodulators with high antioxidant activity. Several other species such as Syzygium samarangense have 16 flavonoida compounds which show pharmacological immunological activity. The purpose of this study was to determine the content of secondary metabolites of ethanol extract of herbal binara (Artemisia vulgaris L.) with red shoots (Syzygium oleana) and to determine the best dose of extract from the ethanol extract of herbal binara (Artemisia vulgaris L.) with red shoots (Syzygium oleana) can reduce the volume of swelling of mouse feet. Examination of the chemical content of secondary metabolites from the ethanol extract of herbal binara (Artemisia vulgaris L.) with red shoots (Syzygium oleana) is carried out by chemical screening and characterization of simplicia and extract. The method used is the slow type hypersensitivity method. In this test the independent variable is the secondary metabolite of ethanol extract of herb binara (Artemisia vulgaris L.) with red shoots (Syzygium oleana) with four concentrations (50, 100, 200 and 400 mg / kgBB). The positive control used by Stimuno dose is 32.5 mg / kgBB

Phytochemical and antioxidant properties of Algerian Medicago Sativa L. Water, Ethenol and Chloroform extract

2019 ◽  
Vol 9 (3) ◽  
pp. 80-86
Author(s):  
Hanane Megdad ◽  
Samuel Chiomokhare ◽  
Ahmed M’Hamedi ◽  
Paul L Chazot
Keyword(s):  
Antioxidant Activity ◽  
Medicago Sativa ◽  
Phenolic Content ◽  
Antioxidant Properties ◽  
Ethanol Extract ◽  
Natural Antioxidants ◽  
Chloroform Extract ◽  
Total Phenolic ◽  
Medicago Sativa L ◽  
Ethanol Extracts

Plant natural products have a long history of being a rich source of neuroactive drugs.The total phenolic and flavonoid content, and antioxidant activity of ethanol, chloroform and aqueous extracts of AlgerianMedicagoSativaL, leaves were measured to discover new potential sources of Algerian natural antioxidants and neuroactives. All extracts were non-neurotoxic up to 1 mg/ ml for 24 h exposure. The total phenolcontent of M.Sativa extracts ranged between 38 and 69 mg GAE per g extracts. All of the extracts displayed antioxidant capacityassessed by two methods, but at different levels depending on the concentration and the extraction solvent used. The overall antioxidant potency was in the order water > chloroform> ethanol extracts, and the phenolic content exhibited a positive correlation with the antioxidant activity of M. Sativa extracts.Despite a weaker antioxidant activity, the ethanol extract elicited a calcium spike and suppressed the KCl-induced depolarisation response in neurons, indicating effect on ligand-and/or voltage gated calcium channels. In contrast, the chloroform and water extractsdisplayed no apparent direct functional effects. In conclusion, the antioxidant and functional properties related to phenolic content of Algerian Medicago Sativa L. in water and ethanol extracts, respectively.

scholarly journals Antioxidant properties of hot water extracts from carpophore and spores of mushroom Ganoderma lucidum

2011 ◽  
pp. 279-288 ◽  
Author(s):  
Anita Klaus ◽  
Maja Kozarski ◽  
Miomir Niksic
Keyword(s):  
Antioxidant Activity ◽  
Ganoderma Lucidum ◽  
Antioxidant Properties ◽  
Water Extract ◽  
Reducing Power ◽  
Hot Water ◽  
Ferrous Ions ◽  
Medicinal Mushrooms ◽  
Water Extracts ◽  
Hot Water Extract

Ganoderma lucidum (Leyss.:Fr.) Karst is one of the medicinal mushrooms, which possesses enviable antioxidant properties. Objective of this investigation was to evaluate antioxidant activity, reducing power, scavenging abilities on 1.1-diphenyl-2-picrylhydrazyl (DPPH) radicals and chelating effects on ferrous ions of hot water extracts obtained from carpophore and spores of this mushroom. Hot water extract from carpophore (Gl-I) showed high antioxidant activity of 85.7 ? 0.7%, at 10 mg/ml, while antioxidant activity of hot water extract from spores (Gl-Is) was 9.2 ? 0.3% at 10 mg/ml. Reducing power of Gl-I reached a plateau of 3.4 ? 0.1 at 20 mg/ml, and 0.3 ? 0.0 at 20 mg/ml for Gl-Is. At 10 mg/ml, scavenging ability on DPPH radicals of Gl-I increased to 96.8 ? 2.5%, whereas Gl-Is scavenged DPPH radicals by 69.6 ? 2.5% at 10 mg/ml. Gl-I chelated 81.6 ? 3.6 % of ferrous ions at 20 mg/ml, while the chelating effect of Gl-Is was 73.8 ? 1.7%. The antioxidative activities of hot water extracts from carpophore and spores of the mushroom G. lucidum were concentration dependent and increased with an increase in the concentration.

scholarly journals Aktivitas Antioksidan Ekstrak Etanol Muntingia calabura dengan Variasi Laju Pengadukan Menggunakan Macerator-Magnetic Stirrer (M-MS)

2020 ◽  
Vol 7 (2) ◽  
pp. 27
Author(s):  
Muhammad Zaini ◽  
Hajrah Hidriya ◽  
Japeri Japeri
Keyword(s):  
Antioxidant Activity ◽  
Ethanol Extract ◽  
Natural Compounds ◽  
Extraction Methods ◽  
Magnetic Stirrer ◽  
Stirring Rate ◽  
Yield Value ◽  
Dpph Method ◽  
Chemical Content ◽  
Muntingia Calabura

Maserasi merupakan salah satu metode ekstraksi yang digunakan untuk menarik kandungan kimia dari bahan alam. Macerator Magnetic Stirrer (M-MS) merupakan alat yang dikembangkan untuk memaksimalkan proses maserasi melalui pengadukan secara berkesinambungan. Tujuan penelitian ini adalah untuk mengetahui efektivitas penggunaan M-MS dalam proses ekstraksi senyawa bahan alam. Parameter yang digunakan yaitu persentase zat terekstraksi (% rendemen) dan aktivitas antioksidan (IC50) ekstrak etanol Muntingia calabura (EEMC) menggunakan metode DPPH (2,2-Diphenyl-1-Picrylhydrazil). Pengujian dilakukan terhadap simplisia daun Muntingia calabura yang  dimaserasi selama 24 jam menggunakan etanol 95% dengan maserator konvensional, M-MS dengan laju pengadukan 200 rpm dan 300 rpm. Pengadukan dengan maserator konvensional dilakukan sebanyak 3 kali setiap 8 jam, sedangkan dengan M-MS dilakukan secara kontinyu selama 24 jam. Nilai % rendemen EEMC dari maserator konevnsional, M-MS 200 rpm dan 300 rpm secara berturut-turut adalah 7,6 %, 8,4 % dan 10,2 %. Hasil uji aktivitas antioksidan menghasilkan nilai IC50 EEMC dengan maserator konvensional sebesar 18,19 ppm, M-MS 200 rpm adalah 14,35 ppm dan 300 rpm adalah 7,85 ppm. Nilai IC50 untuk masing-masing uji menunjukan < 50 ppm yang termasuk dalam kategori sangat kuat. Ekstraksi EEMC paling efektif adalah menggunakan M-MS dengan laju pengadukan 300 rpm. The maceration is one of the extraction methods used to extract chemical content from natural compounds. Macerator Magnetic Stirrer (M-MS) is a tool developed to maximize the maceration process through continuous stirring. The purpose of this study was to determine the effectiveness of using M-MS in the process of extracting natural compounds. The parameters used were the percentage of extracted substance (% yield) and antioxidant activity (IC50) of ethanol extract of Muntingia calabura (EEMC) using the DPPH method (2,2-Diphenyl-1-Picrylhydrazil). Tests were carried out on the simplicia of Muntingia calabura leaves which were macerated for 24 hours using 95% ethanol with a conventional macerator, M-MS with a stirring rate of 200 rpm and 300 rpm. Stirring with a conventional macerator was carried out 3 times every 8 hours, while with M-MS it was done continuously for 24 hours. EEMC yield value respectively of conventional macerator, M-MS at 200 rpm and 300 rpm showed 7.6 %, 8.4% and 10.2 %. The results of the antioxidant activity test resulted in the IC50 EEMC value with a conventional macerator is 18.19 ppm, M-MS 200 rpm is 14.35 ppm and 300 rpm is 7.85 ppm. The IC50 value for each test shows <50 ppm which is included in the very strong category. The most effective EEMC extraction is using M-MS with a stirring rate of 300 rpm.Keywords: maceration, M-MS, EEMC, antioxidant

scholarly journals UJI AKTIVITAS ANTIOKSIDAN EKSTRAK ETANOL BULBUS BAWANG DAYAK (Eleutherine americana Merr) DENGAN METODE DPPH (1,1-Diphenyl-2-Picrylhydrazyl)

PHARMACON ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 451
Author(s):  
Rizkah V. Mokoginta ◽  
Herny E. I. Simbala ◽  
Karlah L.R Mansauda
Keyword(s):  
Antioxidant Activity ◽  
Vitamin C ◽  
Ethanol Extract ◽  
Antioxidant Compounds ◽  
Onion Plant ◽  
Dpph Method ◽  
Ic50 Values ◽  
Experimental Laboratory ◽  
Ethanol Extracts ◽  
Eleutherine Americana

ABSTRACTDayak onion plant (Eleutherine americana Merr.) or commonly called forest onion is a typical plant of Central Kalimantan that has been used by local peoples for cure a various types of diseases. This study aims to determine the activity of antioxidant compounds from Dayak bulb ethanol extracts from Kotamobagu City. This research method is an experimental laboratory. Initially the Dayak bulb sample was extracted maceration with 96% ethanol solvent then evaporated until a thick extract was obtained. As a parameter, the DPPH method (1,1-diphenyl-2-picrylhydrazyl) was used to test the antioxidant activity of the samples at concentrations of 50, 60, 70, 80 and 90 mg / L and as a comparison standard used Vitamin C with concentrations of 2, 4, 6, 8 and 10 mg / L. The results obtained showed antioxidant activity in Dayak bulb ethanol extracts with IC50 values of 41.46 mg / L and on vitamin C IC50 values of 1.04 mg / L. Based on these results it can be concluded that the onion bulb ethanol extract has very strong antioxidant activity. Keywords: Dayak Onion bulbs, Activity, Antioxidant, DPPH  ABSTRAK Tanaman bawang Dayak (Eleutherine americana Merr.) atau biasa disebut bawang hutan merupakan tanaman khas Kalimantan Tengah yang sudah dipergunakan masyarakat lokal sebagai obat berbagai jenis penyakit. Penelitian ini bertujuan untuk mengetahui aktivitas senyawa antioksidan dari ekstrak etanol bulbus bawang Dayak yang berasal dari Kota Kotamobagu. Metode penelitian ini adalah eksperimental laboratorium. Awalnya sampel bulbus bawang Dayak diekstraksi maserasi dengan pelarut etanol 96% kemudian dievaporasi hingga didapatkan ekstrak kental. Sebagai parameter, digunakan metode DPPH (1,1-diphenyl-2-picrylhydrazyl) untuk pengujian aktivitas antioksidan sampel pada konsentrasi 50, 60, 70, 80 dan 90 mg/L dan sebagai standar pembanding digunakan Vitamin C dengan konsentrasi 2, 4, 6, 8 dan 10 mg/L. Hasil penelitian yang didapat menunjukkan aktivitas antioksidan pada ekstrak etanol bulbus bawang Dayak dengan nilai IC50 sebesar 41,46 mg/L dan pada vitamin C nilai IC50 sebesar 1,04 mg/L. Berdasarkan hasil tersebut dapat disimpulkan bahwa ekstrak etanol bulbus bawang Dayak memiliki aktivitas antioksidan yang sangat kuat. Kata kunci: Bulbus Bawang Dayak, Aktivitas, Antioksidan, DPPH

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