Suminar S Achmadi
Departemen Kimia Institut Pertanian Bogor

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OPTIMASI PRODUKSI SERTA ANALISIS AKTIVITAS ANTIOKSIDAN DAN ANTIMIKROBA SENYAWA EKSOPOLISAKARIDA DARI JAMUR TIRAM PUTIH (Pleurotus ostreatus) PADA MEDIA CAIR [Optimization of Exopolysaccharide Production from Pleurotus ostreatus Growth on Liquid Medium and Analysis of Its Antioxidant and Antimicrobial Activity ] Saskiawan, Iwan; Munir, Misbahul; Achmadi, Suminar S
BERITA BIOLOGI Vol 15, No 2 (2016)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2845.341 KB) | DOI: 10.14203/beritabiologi.v15i2.2299


Pleurotus ostreatus is well known as an oyster mushroom that is very popular because of its high nutritional value and pharmaceutical component. The aim of this research was to study the antioxidant and antibacterial activity of exopolysaccharides from P. ostreatus grown on liquid medium.The P. ostreatus was grown on Mushroom Complete Medium (MCM) containing various types of Carbon (C) and Nitrogen (N) sources, i.e glucose, lactose, amylose and sucrose as a Carbon sources and yeast extract, polypeptone, NH4Cl, and NH4NO3 as a Nitrogen sources. The results showed that sucrose and yeast extract were the best source of Carbon and Nitrogen that produced 208 and 100 mg/L of exopolysaccharides.  The exopolysaccharide exhibited antimicrobial activity against Bacillus subtilis and Escherichiacoli. However, it did not have antimicrobial activity against Saccharomyces cerevisiae.  In addition, the exopolysaccharide indicated to have an antioxidant activity.
Physical-Mechanical Properties and Bonding Mechanism of Corn Stalks Particleboard with Citric Acid Adhesive Prasetiyo, Kurnia Wiji; Oktaviani, Linda; Astari, Lilik; Syamani, Firda A; Subyakto, Subyakto; Achmadi, Suminar S
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 16, No 2 (2018): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Jurnal Ilmu dan Teknologi Kayu Tropis

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (38.454 KB)


As a natural fiber and agricultural by-product, corn stalks (Zea mays saccharata) is considered as an alternative raw material to produce particleboard. Corn stalks is a good source of lignocelluloses, renewable and low cost. This research was aimed to investigate the characteristics of corn stalk particleboard with citric acid as adhesive. This study also evaluated bonding mechanism particle with citric acid and the bonds between celluloses derived corn stalk with citric acid. The boards were manufactured under the hot pressing temperature 200 oC for 10 min. The citric acid concentration was varied in 0, 15, 20 and 25 wt%. The board size and target density were (25 x 25 x 0.9) mm3 and 0.8 Results showed that the physical properties of particleboards improved with increasing citric acid concentration up to 20 wt%. At the optimum citric acid content of 20 wt% could provide particleboards with the modulus of rupture, modulus of elasticity and internal bonding satisfied the requirement of the 13 type of the JIS A 5908 (2003) standard. Infrared (IR) spectral analysis from board which manufactured from isolated cellulose was mixed citric acid and pressed on temperature 200 oC showed the presence of ester linkages that the carboxyl and hydroxyl groups of citric acid had reacted with the hydroxyl groups of corn stalk cellulose.Keywords : citric acid, corn stalk, concentration, particleboard, adhesive