Apriadi T, Pratama G, Putra RD, Jumsurizal, Jaya YV, Firdaus M, Arpas HD, Suryanti A. 2018. Comparative study on the fish diversity from natural and bauxite post-mining in wetland system of Bintan Island, Indonesia. Biodiversitas 19: 967-973. In this study, the fish populations between two different wetland systems in Bintan Island, Indonesia, i.e., bauxite post-mining (Kijang) and natural wetland (Toapaya) were compared and to propose a newly index namely Environomic of Fishes Index (EFI) to their respective ecosystems. The purposive random sampling at six stations, each of three stations representing bauxite mining (Kijang) and three stations representing a natural wetland (Toapaya) were used in this research. The numbers of fish species and the abundance were enumerated. The new index derived from the value of diversity index (Shannon), similarity index (Evenness), dominance index (Simpson's), conservation status, and economic value were also evaluated. The natural wetland has higher fish diversity than bauxite post-mining. The total species found were twenty-four. The same seven species were found in both areas. Twelve species were obtained from bauxite post-mining, and nineteen species were obtained from natural wetland. Puntius tetrazona and Rasbora heteromorpha were the common species in area study. The diversity and dominance index was at low category, Evenness index was at high category in all stations, except in tidal swamp station at bauxite post-mining. The EFI in natural wetland was higher than bauxite post-mining. The three community index value, economic value, and conservation status of natural wetland were higher than bauxite post-mining.

Research on the combination of natural ingredients from brown seaweed and Moringa, to be used as sunscreen has been nothing. Therefore, the objective of this study was to determine the best formulation from sunscreen evaluation. In this study, the ratio of Moringa oleifera and Turbinaria conoides was 1:1 (cream L), 2:1 (cream M), 1:2 (cream N), and control (no added both of natural ingredients) (cream K). The evaluation of sunscreen cream by Sun Protection Factor (SPF) activity, viscosity, pH, homogeneity, and microbial test. SPF values in this study from cream K, L, M, and N were 0.75±2.31, 17.80±0.97, 9.48±1.41, and 15.97±2.38, respectively. Viscosity values were 22,400 cPs for cream K; 32,400 cPs for cream L; 26,000 cPs for cream M; and 32,800 cPs for cream N. The pH value of sunscreen cream in cream K, L, M, N were 7.30±0.02, 6.51±0.02, 6.38±0.04, and 6.43±0.04, respectively. In all of the treatments of sunscreen cream, microbial tests are absent and have good homogeneity. The ratio of 1:1 (cream L) between M. oleifera and T. conoides has a good synergistic effect to ward off UV B light, therefore cream L is the best sunscreen cream in this study.

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Karaginan merupakan produk perikanan non ikan yang berasal dari ekstraksi rumput laut merah (Rhodophyceae) yaitu Kappaphycus alvarezii. Karaginan umumnya digunakan dibidang industri kosmetik, tekstil, pangan, farmasi, percetakan bahan baku sebagai pengental, penstabil dan pembentukan gel. Tujuan penelitian ini untuk mengetahui sifat fisiko-kimia semi refined carrageenan (SRC) pada rumput laut merah (Kappaphycus alvarezii). Tahap penelitian meliputi persiapan bahan baku Kappaphycus alvarezii dan pembuatan SRC, kemudian dilanjutkan analisis fisiko-kimia yaitu rendemen, kadar air, kadar abu, kadar abu tidak larut asam, kekuatan gel, viskositas, titik leleh dan titik jendal. Hasil pengamatan fisiko-kimia SRC tersebut yaitu rendemen 24,80%, kadar air 19,20%, kadar abu 16,34%, kadar abu tidak larut dalam asam 0,31, kekuatan gel 376,46 g/cm 2 , viskositas 139,47 cP, titik leleh 55,70 0 C, titik jendal 38°C. Kata kunci: fisiko-kimia, karakterisasi rumput laut, semi refined carrageenan.

Potensi rumput laut di perairan Natuna sangat tinggi akan tetapi penelitian tentang kandungan kimianya masih sangat minim, padahal masyarakat di sana sering mengonsumsinya. Salah satu rumput laut yang sering dimanfaatkan sebagai bahan pangan adalah rumput laut hijau jenis Caulerpa yang dikenal dengan nama “latoh”. Tujuan dari penelitian ini adalah melakukan karakterisasi kimia rumput laut jenis C. racemosa dan C. taxifolia dari perairan Natuna untuk mengetahui kandungan gizinya. Tahapan penelitian ini meliputi pengujian komposisi proksimat, serat pangan dan perhitungan energi yang dibutuhkan oleh tubuh manusia. Hasil uji menunjukkan bahwa nilai proksimat C. taxifolia lebih tinggi bila dibandingkan dengan C. racemosa, kecuali pada kadar abunya. Nilai serat pangan tertinggi terdapat pada C. taxifolia. Perhitungan energi pada C. taxifolia mempunyai nilai yang tinggi jika dikonsumsi oleh manusia (273,24 kkal/100 g) bila dibandingkan dengan C. racemosa (198,58 kkal/100 g). Komposisi tersebut menggambarkan bahwa karakteristik rumput laut dari perairan Natuna jenis C. taxifolia memiliki kandungan gizi yang lebih tinggi bila dibandingkan dengan C. racemosa untuk sumber bahan pangan.