scholarly journals UJI FITOKIMIA DAN AKTIVITAS ANTIOKSIDAN DARI RUMPUT LAUT Sargassum sp. DENGAN METODE PENGERINGAN YANG BERBEDA

2021 ◽  
Vol 4 (1) ◽  
pp. 86
Author(s):  
Fazirul Maulana ◽  
Asnani Asnani ◽  
Haslianti Haslianti
Keyword(s):  
Antioxidant Activity ◽  
Room Temperature ◽  
Temperature Treatment ◽  
Treatment Temperature ◽  
Drying Methods ◽  
Test Results ◽  
Drying Method ◽  
Phytochemical Content ◽  
Ic50 Value ◽  
Dpph Method

ABSTRACT         Sargassum sp. is the most abundant type of seaweed from the brown algae group (Phaeophyceae) which is spread in tropical waters. The aim of this study was to determine the phytochemical content and antioxidant activity of the extract of Sargassum sp. with different drying methods. Sargassum sp. dried using room temperature (± 25ºC) for 21 days and oven (40oC) for 30 hours, then extracted using methanol. Phytochemical tests were carried out to determine the presence of alkaloids, tannins, flavonoids, saponins, steroids, and triterpenoids. The antioxidant activity of the seaweed extract of Sargassum sp. tested by the DPPH method (1-1-diphenyl-2-picrylhydrazyl). Phytochemical test results of the extract Sargassum sp. flavonoids, saponins, triterpenoids, and steroids, while alkaloids and tannins were not found. The value of antioxidant activity in the methanol extract of Sargassum sp. shows a higher room temperature treatment with an IC50 value of 823.652 ppm compared to a treatment temperature of 40oC with an IC50 value of 914.1920 ppm. The drying method affects the antioxidant activity of Sargassum sp. Keywords: Sargassum sp., drying, extraction, phytochemicals, antioxidants.ABSTRAKSargassum sp. merupakan jenis rumput laut paling melimpah dari kelompok alga coklat (Phaeophyceae) yang tersebar di perairan tropis. Tujuan penelitian adalah untuk mengetahui kandungan fitokimia dan aktivitas antioksidan ekstrak Sargassum sp. dengan metode pengeringan yang berbeda. Sargassum sp. dikeringkan menggunakan suhu ruang (± 25ºC) selama 21 hari dan oven (suhu 40oC) selama 30 jam, kemudian diekstrak menggunakan pelarut metanol. Uji fitokimia dilakukan untuk mengetahui keberadaan senyawa alkaloid, tanin, flavonoid, saponin, steroid dan triterpenoid pada ekstrak. Aktivitas antioksidan ekstrak rumput laut Sargassum sp. diuji dengan metode DPPH (1-1-difenil-2-pikrilhidrazil). Hasil uji fitokimia pada ekstrak Sargassum sp. yang dikeringkan pada suhu ruang dan suhu 40oC ditemukan adanya flavonoid, saponin, triterpenoid dan steroid sedangkan alkaloid dan tannin tidak ditemukan. Nilai aktivitas antioksidan pada ekstrak metanol Sargassum sp. menunjukan perlakuan suhu ruang lebih tinggi dengan nilai IC50 823,652 ppm dibandingkan perlakuan suhu 40oC dengan nilai IC50 914,1920 ppm. Metode pengeringan berpengaruah terhadap aktivitas antioksidan dari Sargassum sp.Kata kunci: Sargassum sp., pengeringan, ekstraksi, fitokimia, antioksidan.

scholarly journals Pengaruh Metode Pengeringan Terhadap Aktivitas Antioksidan Ekstrak Etanol

2019 ◽  
Vol 3 (1) ◽  
pp. 44-52
Author(s):  
Endra Pujiastuti ◽  
Rahma Sani Saputri
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Ethanol Extract ◽  
Drying Methods ◽  
Drying Method ◽  
Oven Method ◽  
Ic50 Value ◽  
Dpph Method ◽  
Qualitative Test ◽  
High Antioxidant Activity

Drying is the most important step to keep the compound stability in simplicia and is very influential to produce good quality igredients in the antioxidant activity contained in the simplicia. Antioxidants are oxidation-free inhibitors of free radical reactions. Parijoto is one of the plants that have antioxidant compounds.This study aims to determine the effect of drying, concentration of antioxidant activity of parijoto (Medinilla speciosa Blume) fruit. The drying method used is direct sunlight drying, indirect sunlight and oven. The antioxidant activity of ethanol extract on drying method was determined by 2,2 diphenyl-1-picrylhidrazyl (DPPH) method which is free radical. The qualitative test DPPH showed that the higher levels of ethanol extract from the three drying methods further diminished the color of DPPH solution in ethanol.The result showed thet the drying method gave different effect to the antioxidant activity of parijoto fruit which is significant(p0,05). Drying methods wich have high antioxidant activity are given by drying using oven method with an IC50 value 33,75µg/ml.

scholarly journals SKRINING FITOKIMIA, UJI AKTIVITAS ANTIOKSIDAN, DAN TOKSISITAS DARI EKSTRAK DAUN KERSEN (Muntingia calabura L.) DENGAN METODE 1.1-diphenyl-2-picrylhydrazyl (DPPH) dan Brine Shrimp Lethality Test (BSLT)

PHARMACON ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 315
Author(s):  
Selin Widjaya ◽  
Widdhi Bodhi ◽  
Adithya Yudistira
Keyword(s):  
Antioxidant Activity ◽  
Ethyl Acetate ◽  
Brine Shrimp ◽  
Ethanol Extract ◽  
Brine Shrimp Lethality ◽  
Phytochemical Content ◽  
Lc50 Value ◽  
Ic50 Value ◽  
Dpph Method ◽  
Muntingia Calabura

ABSTRACTKersen (Muntingia calabura L.) is a plant that has begun to be eliminated and was rarely used because it is often considered to have no economic value and lack of knowledge about its utilization, whereas kersen plants contain flavonoids, saponins, and tannins which were have high benefit for health. The content of metabolites is affected by soil nutrient elements and difference place of growth. This study aims to determine the potential of kersen leaves grown in North Minahasa based on phytochemical content, ability of antioxidant activity, and toxicity. Kersen leaves were extracted using sequential maceration method with n-hexane, ethyl acetate, and ethanol as solvents. Phytochemical Screening using several reagents which tailored to the type of phytochemical test. 1.1-diphenyl-2-picrylhydrazyl (DPPH) method is used to evaluate antioxidant activity, and Brine Shrimp Lethality Test (BSLT) method is used to evaluate toxicity. The result of this study indicate that the n-hexane extract contains phenols, flavonoids, and tannins, with IC50 value 12.54 μg/mL, and LC50 value 881 μg/mL. Ethyl acetate extract contains phenols, flavonoids, tannins, and saponins, with IC50 value 61.3 μg/mL, and LC50 value 1758 μg/mL. Ethanol extract has phenol, flavonoid, tannin, saponin, and terpenoid content, with IC50 value 9.01 μg/mL, and LC50 value 106 μg/mL. Keywords : Kersen leaves, Antioxidant, Toxicity, IC50, LC50 ABSTRAKKersen (Muntingia calabura L.) merupakan tanaman yang sudah mulai tersingkirkan dan jarang dimanfaatkan karena sering dianggap tidak punya nilai ekonomis dan kurangnya pengetahuan tentang pemanfaatannya, padahal tanaman kersen memiliki kandungan flavonoid, saponin, dan tanin yang bermanfaat tinggi untuk kesehatan. Kandungan senyawa metabolit dipengaruhi oleh unsur hara tanah dan perbedaan tempat tumbuh. Penelitian ini bertujuan untuk mengetahui potensi dari daun kersen yang tumbuh di Minahasa Utara berdasarkan kandungan fitokimia, kemampuan aktivitas antioksidan, dan toksisitasnya. Ekstrak daun kersen diekstraksi dengan metode maserasi sekuensial menggunakan pelarut n-heksan, etil asetat, dan etanol.  Skrining fitokimia menggunakan beberapa reagen yang disesuaikan dengan jenis uji fitokimia. Metode 1.1-diphenyl-2-picrylhydrazyl (DPPH) digunakan untuk mengevaluasi aktivitas antioksidan, dan metode Brine Shrimp Lethality Test (BSLT) digunakan untuk mengevaluasi toksisitas. Hasil penelitian ini menunjukkan bahwa ekstrak n-heksan memiliki kandungan fenol, flavonoid, dan tanin, nilai IC50 12,54 μg/mL, dan nilai LC50 881 μg/mL. Ekstrak etil asetat memiliki kandungan fenol, flavonoid, tanin, dan saponin, nilai IC50 61,3 μg/mL, dan nilai LC50 1758 μg/mL. Ekstrak etanol memiliki kandungan fenol, flavonoid, tanin, saponin, dan terpenoid, nilai IC50 9,01 μg/mL, dan nilai LC50 106 μg/mL. Kata kunci : Daun Kersen, Antioksidan, Toksisitas, IC50, LC50

scholarly journals Aktivitas antioksidan krim kombinasi ekstrak Eucheuma Cottonii Sumbawa dan ekstrak Citrus lemon L. impor dengan metode DPPH

2019 ◽  
Vol 3 (1) ◽  
pp. 29
Author(s):  
Dwi Kurniawati Sambodo ◽  
Nandia Arlesia
Keyword(s):  
Antioxidant Activity ◽  
Negative Impact ◽  
Positive Control ◽  
Test Results ◽  
Negative Effects ◽  
High Exposure ◽  
Ic50 Value ◽  
Dpph Method ◽  
Qualitative Test ◽  
Eucheuma Cottonii

Cerrenty, The high exposure for free radicals has a negative impact on the health and aesthetics of the skin, especially facial skin, because it requires cosmetic that contain antioxidants to counteract and reduce the negative effects of it. Eucheuma cottonii and Citrus lemon L have bioactive compounds that have the potential as antioxidants. This research was conducted to find out antioxidant activity and the most optimal formula of the three cream formulas by DPPH method. Eucheuma cottonii and Citrus lemon L peel were extracted by remaseration method. The cream is formulated in 3 formulas with a ratio of extracts of 1: 2, 2: 1, and 1: 1 in 100 grams of cream with positive control of vitamin C. The three formulas were tested qualitatively and quantitatively by DPPH method with spectrophotometry visible at maximum wavelength 517 nm uses IC50 value. Qualitative test shown that the three cream formulas had antioxidant activity by DPPH damping which were characterized by reduced intensity of purple color. Quantitative test results in IC50 value formula 1 was 11251.5 ppm, formula 2 was 8592.2 ppm, and 10025.5 ppm for formula 3. From too  concluded that the three creams have antioxidant activity and formula 2 has the most optimal antioxidant than 2 other formulas

scholarly journals The Effect of Simplisia Drying Method on Antioxidant Activity of Senggani Fruit Extract (Melastoma Malabathricum L.) by DPPH (2,2-diphenyl-1-picrylhydrazyl)

2021 ◽  
Vol 19 (2) ◽  
pp. 144-153
Author(s):  
Shesanthi Citrariana ◽  
Risqika Yulia Tantri Paramawidhita ◽  
Melliani Melliani
Keyword(s):  
Antioxidant Activity ◽  
Crude Extract ◽  
Degradation Process ◽  
Oxidation Reactions ◽  
Drying Method ◽  
Fruit Extract ◽  
Melastoma Malabathricum ◽  
Ic50 Value ◽  
Study Results ◽  
Dpph Method

Senggani fruit (Melastoma Malabathricum L.) contains anthocyanin that functioning as an antioxidant. Anthocyanin are tremendously sensitive to thermal processes which trigger phytochemical or photo-oxidation reactions that can open anthocyanin rings. The objective of this study is to identify the effect of the simplicia drying method on the antioxidant activity of Senggani fruit extract. Senggani fruit extract was prepared by obtaining samples of ripe fruit, dry sorting, washing, wet sorting, and drying using two methods; sunlight and oven at 70oC. After the simplicia was dry, it was blended and sifted until smooth. The fine simplicia was macerated with 96% ethanol and evaporated to gain a crude extract. The crude extract was assessed with reagents for phytochemical screening. Furthermore, the crude extract was examined for antioxidant activity by the DPPH method. This study implies that the simplicia and crude extract of Senggani fruit from drying in sunlight and oven possess different organoleptic properties such as color, smell, and taste. In phytochemical testing with reagents, it was discovered that anthocyanin compounds were unveiled in drying utilizing sunlight while employing an oven at 70oC; no anthocyanins were found. The antioxidant testing of Senggani fruit extract revealed that the drying method employing sunlight had an IC50 value of 18.8 g/mL while the oven temperature of 70oC owned an IC50 value of 28.3 g/mL. Based on the study results, it can be identified that the simplicia drying method affects the antioxidant activity of the Senggani fruit extract. The drying method in the sun produces extracts with greater antioxidant activity while drying in an oven at 70oC results in a degradation process of anthocyanin compounds, thereby decreasing the antioxidant activity of the Senggani fruit extract.  

scholarly journals FITOKIMIA DAN AKTIVITAS ANTIOKSIDAN EKSTRAK KULIT BATANG Chisocheton sp. (C.DC) Harms (Meliaceae)

2020 ◽  
Vol 13 (2) ◽  
Author(s):  
Dewa Gede Katja
Keyword(s):  
Antioxidant Activity ◽  
Ethyl Acetate ◽  
Methanol Extract ◽  
Ethyl Acetate Extract ◽  
Stem Bark ◽  
Bark Extract ◽  
Test Results ◽  
Ic50 Value ◽  
Dpph Method ◽  
Stem Bark Extract

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.

scholarly journals Antioxidant activity ethanol extract of gotu kola (Centella asiatica (L.) Urban) with DPPH method (2,2-Diphenyl-1-Pikrilhidrazil)

2020 ◽  
Vol 3 (2) ◽  
pp. 106
Author(s):  
Muhammad Ainul Yahya ◽  
Iif Hanifa Nurrosyidah
Keyword(s):  
Air Pollution ◽  
Antioxidant Activity ◽  
Free Radicals ◽  
Centella Asiatica ◽  
Ethanol Extract ◽  
The Body ◽  
Antioxidant Compounds ◽  
Test Results ◽  
Ic50 Value ◽  
Dpph Method

Unhealthy lifestyles and air pollution cause the number of free radicals in the body to increase. To protect the body from free radicals, there are antioxidant compounds as an antidote and stabilize free radicals. One of the Indonesian plants that can be used as antioxidants is gotu kola (Centella asiatica (L.) Urban. Objective: This study aims to determine the antioxidant activity of the ethanol extract of gotu kola herb using the DPPH (2,2-Diphenyl-1-pikrilhidrazil) method. with IC50 value. Method: Gotu kola (Centella asiatica (L.) Urban) was extracted by the soxhletation method using 96% ethanol solvent. The testing of antioxidant activity was carried out using the DPPH (2.2 Diphenyl-1-Pikrihydrazil) method. Result: Test results of antioxidant activity The ethanol extract of gotu kola herb showed an IC50 value of 78.20 ppm. Conclusion: This indicated that the ethanol extract of gotu kola herb was included in the criteria for strong antioxidants. 

scholarly journals Kapasitas Antioksidan Ekstrak Buah Rukam (Flacourtia rukam) Menggunakan Metode Microwave Assisted Extraction (MAE)

2020 ◽  
Vol 7 (2) ◽  
pp. 107-113
Author(s):  
Inas Fadiyah ◽  
Iin Lestari ◽  
Robby Gus Mahardika
Keyword(s):  
Antioxidant Activity ◽  
Extraction Method ◽  
Psidium Guajava ◽  
Microwave Assisted Extraction ◽  
Test Results ◽  
Fruit Extract ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Ic50 Value ◽  
Dpph Method

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.

scholarly journals ANTIOXIDANT ACTIVITY OF METHANOL EXTRACT NATUNA MARINE SPONGE (PORIFERA) WITH DPPH METHODE

2021 ◽  
pp. 109-112
Author(s):  
DELLADARI MAYEFIS ◽  
SRI HAINIL ◽  
SISKA WIDIASTUTI
Keyword(s):  
Antioxidant Activity ◽  
Secondary Metabolites ◽  
Marine Sponge ◽  
Methanol Extract ◽  
Marine Animal ◽  
Phytochemical Content ◽  
Ic50 Value ◽  
Dpph Method ◽  
Wide Range ◽  
Measured Absorption

Objective: Natuna sponge is a marine animal that contains a wide range of secondary metabolites that can be utilized in the field of pharmacy. The research aims to test the phytochemical content and antioxidant activity of the Natuna methanol marine sponge extract. Sample extraction is done by the maceration method with methanol solvent. Methods: Phytochemical tests include alkaloid testing, flavonoids, steroids, saponins, and tannins. Test antioxidant activity using the immersion DPPH method (1.1-diphenyl-2-picryl hydroxyl) measured absorption at a wavelength of 517 nm. Results: The phytochemical test results showing the sponge of Natuna contain secondary metabolites including alkaloids, flavonoids, steroids, saponins, and tannins. Conclusion: This Natuna sponge methanol extract has an antioxidant activity that is very strong with an IC50 value of 52.91 ppm, and the comparator used is Vitamin C with an IC50 value of 43,51 ppm.

scholarly journals Solid dispersion of quercetin-PVP K-30 and its effects on the antioxidant activity

2020 ◽  
Vol 16 (2) ◽  
pp. 144-154
Author(s):  
Zahara Gayo ◽  
Henny Lucida ◽  
Erizal Zaini
Keyword(s):  
Antioxidant Activity ◽  
Solid Dispersion ◽  
Freeze Drying ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Spectrophotometric Analysis ◽  
Drying Method ◽  
X Ray Diffraction ◽  
Ic50 Value ◽  
Dpph Method

Background: Quercetin (3,3’,4’,5,7-pentahydroxil-flavon) is a flavone and secondary metabolite known as flavonoid. Quercetin belongs to class II BCS that has low solubility and high permeability. The poor solubility of quercetin restricts the accessibility and bioavailability. Objectives: To increase the solubility, dissolution, and antioxidant activity in a solid dispersion system. Methods: Preparation of quersetin-PVP K-30 solid dispersion was conducted using the freeze-drying method at -96 degree C for 24 hours with a ratio of 1:1, 1:0.5, and 0.5:1 and a 1:1 physical mixture of quercetin-PVP K-30. The solid dispersion of quercetin-PVP K-30 was characterized by Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) analysis, and FT-IR spectrophotometric analysis. Solubility test was analyzed using a UV-Vis spectrophotometer, dissolution test was done using a paddle-type dissolution tester, dissolved quercetin concentrations were analyzed using a UV-Vis spectrophotometer, and antioxidant activity was determined using the DPPH method in a UV-Vis spectrophotometer. Results: SEM analysis showed the formation of quercetin-PVP K-30 solid dispersion using the freeze-drying method, and the form changed into anhydrate as seen from the XRD results with the presence of new crystalline peaks in solid dispersion, which were not seen in pure quercetin and PVP K-30. Quercetin-PVP K-30 solid dispersion could increase the solubility by 54-fold at a ratio of 0.5:1 with 94.36%±0.85 quercetin dissolved in 120 minutes. The formation of this solid dispersion affected the antioxidant activity which was observable from the IC50 value at the best ratio of 0.5:1 reaching 0.714 microgram/mL while the IC50 value of pure quercetin is 1.102 microgram/mL. Conclusion: The formation of quercetin solid dispersion could increase the solubility and dissolution and affect the antioxidant activity. Keywords: solid dispersion, freeze-drying, quercetin, antioxidant

scholarly journals KANDUNGAN FITOKIMIA DAN AKTIVITAS ANTIOKSIDAN EKSTRAK METANOL RUMPUT LAUT Kappaphycus alvarezii

2017 ◽  
Vol 5 (3) ◽  
pp. 73
Author(s):  
Puji Lestari Lantah ◽  
Lita ADY Montolalu ◽  
Albert Royke Reo
Keyword(s):  
Fatty Acids ◽  
Antioxidant Activity ◽  
Unsaturated Fatty Acids ◽  
Methanol Extract ◽  
Kappaphycus Alvarezii ◽  
Drying Process ◽  
Phytochemical Content ◽  
Ic50 Value ◽  
Dpph Method

The objective of the study was to determine the phytochemical content and antioxidant activity of Kappaphycus alvarezii seaweed extracted with methanol solvent. The extract was obtained by maceration of dried seaweed. Phytochemical tests were performed to determine the presence of alkaloids, flavonoids, saponins, triterpenoids and steroids. Kaphaphycis alvarezii seaweed antioxidant activity was tested by DPPH method (1-1-diphenyl-2-picrylhydrazyl). A phytichemical test revealed that there was not any alkaloids, flavonoids, saponins, steroids and triterpenoids content in methanol extract Kappaphycus alvarezi. The antioxidant activity by DPPH method showed the high IC50 value (163.82 ppm) It is indicated that the antioxidant activity of Kappaphycus alvarezii of dried seaweed extracted with methanol was very weak. The negative result from phytochemical test was speculated caused by the drying process of seaweed samples, the type of seaweed itself, and the insufficiency of desalting process. The unsaturated fatty acids was suspected to act as antioxidant in this type of seaweedTujuan penelitian adalah untuk mengetahui kandungan fitokimia dan aktivitas antioksidan rumput laut Kappaphycus alvarezii yang diekstraksi dengan pelarut metanol. Ekstrak diperoleh dengan cara maserasi terhadap rumput laut kering. Uji fitokimia dilakukan untuk mengetahui keberadaan senyawa alkaloid, flavonoid, saponin, triterpenoid dan steroid. Aktivitas antioksidan rumput laut Kaphaphycis alvarezii diuji dengan metode DPPH (1-1-difenil-2-pikrilhidrazil). Hasil penelitian memperlihatkan tidak terdeteksinya senyawa alkaloid, flavonoid, saponin, steroid dan triterpenoid pada ekstrak metanol Kappaphycus alvarezi. Uji aktivitas antioksidan dengan metode DPPH menunjukkan nilai IC50 sebesar 163.82 ppm. Hal ini menunjukkan bahwa aktivitas antioksidan rumput laut Kappaphycus alvarezii kering yang diekstraksi dengan metanol sangat lemah. Tidak terdeteksinya kandungan fitokimia diduga karena sampel rumput laut dikeringkan dengan sinar matahari langsung, jenis rumput laut ini tidak memiliki aktivitas antioksidan yang tinggi dan proses desalting yang tidak maksimal. Aktivitas antioksidan yang sangat lemah dari rumput laut ini diduga berasal dari kandungan asam lemak tak jenuh

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