Indonesian waters are rich in biological resources of seaweed, one of which is seaweed Eucheuma cottonii. However, its use is still limited for the process of making various foods such as food thickeners, stabilizers and forming food gels. Even though it's seaweed Eucheuma cottonii has a much more important role, namely containing bioactive components that can function as antibacterials that are beneficial to human health. The aim of this research is to identify the various bioactive components of seaweed Eucheuma cottonii which has potential as an antibacterial. This research method uses a descriptive exploratory method by collecting information from various previous research literature, both from national and international journals and databases online like Researchgate, Google Scholar, and Directory of Open Access Journals. The results of this study indicate the active components of seaweed Eucheuma cottonii contains alkaloids, saponins, steroids, flavonoids, and polyphenols soil which can function as an antibacterial against gram-negative and gram-positive bacteria such as E. coli, Staphylococcus aureus, Streptococcus mutans, Bacillus cereus, Salmonella typhi, Pseudomonas aeruginosa, Vibrio cholera and Proteus mirabilis. In order for the bioactive components of seaweed to function effectively as an anti-bacterial, it is better to use a higher concentration of seaweed extract.
Buah api-api putih (Avicennia alba Blume) mengindikasikan adanya senyawa berupa golongan flavanoid dan tanin yang diduga mempunyai kemampuan sebagai tabir surya dan mampu memberikan efek perlindungan terhadap radiasi ultraviolet. Penelitian ini bertujuan menguji keefektifan buah api- api putih sebagai tabir surya yang dapat menyerap sinar radiasi ultraviolet (UV) dari paparan sinar matahari. Parameter pengujian meliputi uji stabilitas fisika dan kimia serta uji efektivitas tabir surya dengan menentukan nilai SPF (Sun Protection Factor) menggunakan spektrofotometer ultraviolet sinar tampak (UV-Vis) pada panjang gelombang 290-320 nm. Hasil evaluasi menunjukkan tidak adanya perbedaan signifikan antara formula 1 sampai formula 3 (F1-F3) untuk penampakkan warna, bau dan homogenitasnya. Sediaan berwarna hijau, homogen dan berbau khas ekstrak tapi tidak terlalu pekat. Warna sediaan dipengaruhi warna sampel buah api- api putih yang berwarna hijau. Nilai pH pada F1-F3 masing-masing 6,7; 7,3 dan 8,0 yang menunjukkan nilai tersebut masuk dalam kisaran standar SNI 16-4399-1996 untuk produk kulit tabir surya yaitu berkisar antara 4,5-8,0. Nilai SPF ekstrak buah api-api putih dari F1-F3 masing-masing 16,72; 19,16 dan 21,86. Berdasarkan standar nasional Indonesia nilai SPF tabir surya minimal 15. Hal ini dapat dikatakan bahwa bahan aktif ekstrak buah api-api putih efektif sebagai tabir surya.
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