Optimasi Perlakuan Alkali dalam Upaya Peningkatan Kualitas Agar dari Rumput Laut (Gracilaria spp)  

Oleh:

Zatnika, Achmad ; Istini, Sri

Jenis: Article from Journal - ilmiah nasional
Dalam koleksi: Jurnal Standardisasi: Majalah Ilmiah Standardisasi vol. 10 no. 2 (2008), page 47-55.
Topik: Gracilaria spp.; Agar; Yield; 3; 6 Anhydro galactose; Gels Trength; Sulphate Ester Group

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: SS48 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Agar is a hydrophilic colloids extracted certain marine algae of the class Rhodophyceae. Agar is strongly gelling seaweed hydrocolloid composed of polysaccharides. The main structure of agar is chemically characterized by the repeating units of D-galactose and 3,6-anhydro-L-galactose with a few variations, as well as by a low ester sulphate content. The qualities of Agar depend of alkali treatment process. The experiment is alkali treatment process of Agar extraction from Gracilaria spp. The variation of temperature for cooked was 70 celcius degree and 80 celcius degree. The variation of sodium hydroxide solution was 3, 6, 8, 10% and for control without sodium hydroxide. The yield of Agar in this experiment was increased by temperature, but not significant by sodium hydroxyde solution. The content of 3,6 anhydro galactose was increased but the sulphate ester group was decrease when the seaweed of Gracilaria was treated by increased the temperature and concentrations of sodium hydroxide. The gel strength of Agar was enhanced significantly by increased the sodium hydroxide solution but not by temperature. The native Agar or Agar without alkali solution was observed that yield of Agar was 8,26% at 70 celcius degree and 6.58% at 80 celcius degree, content of 3,6 anhydro galactose (AG) was 20,49% at 70 celcius degree and 33,12 at 80 celcius degree, gel strength was 53.5 at 70 celcius degree and 59,5 at 80 celcius degree, sulphate ester group was 6,26 at 70 celcius degree and 5,44 at 80 celcius degree. After alkali treatment: yield of Agar was varied from 8,25% to 11,76% at 70 celcius degree and 6,58% to 8,12% at 80 celcius degree;3,6 AG was varied from 20,49% to 50,44 at 70 celcius degree and 33,12% to 52,22% at 80 celcius degree; Gel strength was varied from 53,5 to 546,5 gram/cm2 at 70 celcius degree and 59,5 to 449,5 gram/cm2 at 80 celcius degree; sulphate was varied from 2,74% to 6,26% at 70 celcius degree and 2,42% to 5,44% at 80 celcius degree. The optimal condition was obtained in treated with 10% NaOH solution concentration at 70 celcius degree or 80% at 80 celcius degree.

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