A comparison of the poly(hexamethylenebiguanidinium chloride) assay and a neutral equivalent method for the determination of alginates in industrial liquors extracted from brown seaweed

Radikal bebas merupakan senyawa yang bersifat reaktif dan berbahaya karena dapat merusak sel tubuh. Hal ini dapat diatasi dengan pemberian senyawa antioksidan. Saat ini di pasaran telah beredar antioksidan sintetis, tetapi senyawa ini bersifat akumulatif dan toksik. Oleh karena itu perlu pencarian senyawa alami bersifat antioksidan alami dan salah satunya salah satu sumbernya adalah rumput laut. Perairan Jepara memiliki sumber daya rumput laut yang tinggi dan salah satunya jenis Sargassum. Penelitian ini bertujuan melakukan kajian evaluasi total senyawa fenol dan kapasitas antioksidan berbagai ekstrak Sargassum. Hasil penelitian ini sebagai dasar dalam penelitian suplemen antioksidan untuk tindakan preventif. Penelitian dilaksanakan pada bulan Juni 2018 dengan tahapan pengambilan sampel, ekstraksi, penentuan total fenol dan aktivitas antioksidan. Metode pengambilan sampel menggunakan metode purposif dan penentuan kapasitas antioksidan dan total fenol menggunakan metode eksperimen laboratoris. Hasil analisis menunjukkan perlakuan perbedaan jenis ekstrak memiliki nilai persen inhibisi (IC50) yang berbeda secara nyata (p < 0,05). Tiga ekstrak dengan persen inhibisi terbaik jika diurutkan dari terkecil ke terbesar adalah ekstrak dengan pelarut etil asetat pada S. polycystum, S. crassifolium dan S duplicatum. Semakin tinggi konsentrasi ekstrak maka nilai persen inhibisi semakin tinggi juga (p < 0,05) demikian juga pada nilai total senyawa fenol. Kesimpulan dari penelitian ini terdapat hubungan antara total fenol dan persen inhibisi adalah linier dengan persamaan regresi dan nilai besar hubungan berbeda signifikan (p < 0,05). Free radical are reactive and dangerous compound which have bad impact to human cell. Antioxidant is an effective compound to against free radical. Recently, synthesis antioxidant are easy to find in the market, however, this compound tends to toxic accumulation. The nature antioxidant can be a solution of negative effect from synthesis product. Seaweed is natural product which content an active compound as antioxidant. Sargassum is brown seaweed that abundant in Jepara seawater. This study are aiming to evaluate of phenol content and antioxidant capacity from several sargassum extract. The result of this study is a primarily research of antioxidant supplements for preventive measures. This study was conducted in June 2018 with the stages of sampling, extraction, determination of total phenol and antioxidant activity. Purposive method is used for sampling method and experimental laboratory is used for determination of antioxidant capacity and total phenol. The analysis result show that each sargassum extract has significant deferent of inhibition concentrations (IC50) (p < 0,05). Three extracts with the best percentage of inhibition sorted from the smallest to the largest were S. polycistum, S. crassifolium and S duplicatum which were extracted with ethyl acetate solvents. The percentage of inhibitions are increase with increasing of extract concentration and phenol compound. The conclusion of this study is that total phenol and percent inhibition are linear with regression equations and significant difference values (p <0.05).

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Proximate Composition of Bio Potential Seaweeds from Mandapam South East Coast of India

International Letters of Natural Sciences ◽

10.18052/www.scipress.com/ilns.45.49 ◽

2015 ◽

Vol 45 ◽

pp. 49-55 ◽

Cited By ~ 3

Author(s):

S. Gokulakrishnan ◽

K. Raja ◽

G. Sattanathan ◽

J. Subramanian

Keyword(s):

Proximate Composition ◽

Nutritional Value ◽

East Coast ◽

Brown Seaweed ◽

Ash Content ◽

Human Consumption ◽

Red Seaweed ◽

Enteromorpha Intestinalis ◽

Bare Minimum

Proximate composition of the three green seaweeds viz., Chaetomorpha aerea, Enteromorpha intestinalis, Enteromorpha compressa one brown seaweed Dictyota dichotoma and one red seaweed Gracilaria corticata was investigated by determination of protein, carbohydrates, lipid, moisture and ash content. In the present study, the total protein was recarded upper most in E.intestinalis and bare minimum in E.compressa. The maximum carbohydrates recorded in C. aerea and minimum in G. corticata. The lipid content was acquired upper limit in E. compressa and least in C. aerea. The ash and moisture content in following of 5 different seaweeds are as follows: 7.45mg/g, 3.91mg/g were recorded in the C.aerea, 8.52mg/g, 3.42mg/g in the E.intestinalis, 8.58mg/g, 3.75mg/g in the E.compressa, 9.47mg/g, 4.23mg/g in the D.dichotoma and 6.95mg/g, 3.98mg/g in G.corticata. The proximate composition of 5 different seaweed species exhibited high nutritional value for human consumption.

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Determination of thermal transitions of gluten-free chestnut flour doughs enriched with brown seaweed powders and antioxidant properties of baked cookies

Heliyon ◽

10.1016/j.heliyon.2019.e01805 ◽

2019 ◽

Vol 5 (6) ◽

pp. e01805 ◽

Cited By ~ 1

Author(s):

Santiago Arufe ◽

Jorge Sineiro ◽

Ramón Moreira

Keyword(s):

Antioxidant Properties ◽

Brown Seaweed ◽

Gluten Free ◽

Thermal Transitions ◽

Chestnut Flour

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Galactic orbits of stars

Symposium - International Astronomical Union ◽

10.1017/s0074180900105340 ◽

1966 ◽

Vol 25 ◽

pp. 93-97

Author(s):

Richard Woolley

Keyword(s):

Globular Cluster ◽

Potential Field ◽

High Velocity ◽

Velocity Vector ◽

Variable Stars ◽

The Sun ◽

Proper Motions ◽

Rr Lyrae ◽

The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

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