Judul: Systematic Review: Comparison of the Antioxidant Value of Sea Cucumber, Spirulina and Seaweed Extract
Abstrak: Antioxidants are compounds that can inhibit or prevent oxidation processes in the body caused by the presence of free radicals. The purpose of this study was to compare the best antioxidant compound content from sea cucumber, spirulina and seaweed extract samples. The research method was carried out using a Systematic Review technique on antioxidant research from sea cucumber, spirulina and seaweed extracts. All samples were extracted by maceration method with polar solvents. The results of the review showed that the highest antioxidant activity was found in brown seaweed extract with an average value of 29.2 ppm, followed by red seaweed antioxidant value of 104.44 ppm, spirulina of 265.6 ppm, sea cucumbers of the genus Holothuria and sea cucumbers of the genus Stichopus each of 1180.16 ppm and 1832.44 ppm. Based on the classification of the strength of antioxidant activity, it can be concluded that brown seaweed extract is classified as a very strong antioxidant IC50 <50 ppm, red seaweed extract is classified as a moderate antioxidant IC50 100-150 ppm and spirulina and sea cucumber extracts are classified as very weak antioxidants IC50 >200 ppm.
Keyword: Antioksidan, Fitokimia, Total fenol

Judul: Literature Review Effect of Drying and Extraction Methods on Sargassum sp Antioxidant Activity
Abstrak: Antioksidan merupakan senyawa aktif yang berperan dalam mencegah efek negatif radikal bebas. Tujuan penelitian ini adalah mengidentifikasi, menganalisis dan membandingkan sumber pustaka mengenai pengaruh metode pengeringan dan ekstraksi dengan beberapa pelarut terhadap aktivitas antioksidan Sargassum sp. Rataan total fenol metode pengeringan sebesar 1.335±0.615 mg GAE/g berat kering (oven) dan 24.020±4.029 mg GAE/g berat kering (kering angin) dengan rataan tertinggi pada pengeringan kering angin. Rataan total fenol metode ekstraksi sebesar 4.132±2.565 mg GAE/g berat kering (semi-polar) dan 17.135±6.032 mg GAE/g berat kering (polar) dengan rataan tertinggi pada penggunaan pelarut polar. Rataan aktivitas antioksidan metode pengeringan sebesar 63.12±31.09 ppm (kering angin) dan 1840.85±1059.46 ppm (oven) dengan rataan aktivitas antioksidan tertinggi pada pengeringan kering angin. Rataan aktivitas antioksidan metode ekstraksi sebesar 45.55±9.11 ppm (polar) dan 98.14±6.03 ppm (semi-polar) dengan rataan aktivitas antioksidan tertinggi pada penggunaan pelarut polar. Oleh karena itu, metode pengeringan kering angin dan ekstraksi dengan pelarut polar merupakan metode terbaik dalam menghasilkan antioksidan yang kuat., Antioxidants are active compounds that play a role in preventing the negative effects of free radicals. The purpose of this study was to identify, analyze and compare literature sources on the effect of drying and extraction methods with some solvents on the antioxidant activity of Sargassum sp. The average of total phenol drying method was 1.333±0.615 mg GAE/g dry weight (oven) and 24.020±4.029 mg GAE/g dry weight (shade dried) with the highest average in shade dried. The average of total phenol extraction method was 4.132±2.565 mg GAE/g dry weight (semi-polar) and 17.135±6.032 mg GAE/g dry weight (polar) with the highest average in extraction with polar solvent. Antioxidant activity of drying methods was 63.12±31.09 ppm (shade dried) and 1840.85±1059.46 ppm (oven) with the highest average in shade dried. The average of antioxidant activity of extraction methods was 45.55±9.11 ppm (polar) and 98.14±6.03 ppm (semi-polar) with the highest average in extraction with polar solvent. Therefore, drying with shade dried and extraction with polar solvents was the best method of producing strong antioxidants.
Keyword: antioxidant, drying, extraction, Sargassum sp.

Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
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