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Articles by Alfi Rumidatul
Total Records ( 3 ) for Alfi Rumidatul
  Alfi Rumidatul , Endah Sulistyawati and I Nyoman Pugeg Aryantha
  Background and Objectives: Sengon Falcataria moluccana (F. moluccana) has the ability to synthesize protease inhibitors, such as trypsin inhibitors, that can inhibit the activity of an enzyme produced by Uromycladium tepperianum (U. tepperianum), a fungus that causes gall rust disease. The purpose of this research is to study the activity of the trypsin inhibitor, the total protein content and the protein profile in healthy and gall rust infected sengon. Materials and Methods: The samples used in this research were taken from sengon twigs consisting of healthy and gall rust infected bark and wood. In this research, three age classes of sengon were used: 1-2 years, 3-4 years and 5-6 years. The method used in this research was field sampling, trypsin inhibitor activity analysis, protein determination and protein profile analysis by SDS-PAGE (Sodium dodecyl sulfate-polyacrylamide gel electrophoresis). Results: The results showed that, in general the activity of trypsin inhibitors in the gall rust infected sengon twigs was higher than in the healthy sengon twigs. The highest protein content was found in gall rust infected bark twigs and the lowest protein content was in healthy wood twigs. The results of the SDS-PAGE analysis of healthy and gall rust infected bark showed that there was a protein with a molecular weight of 21 kDa, which was identified as a trypsin inhibitor. Conclusion: Falcataria moluccana infected with U. tepperianum fungus showed an increase in the activity of trypsin inhibitors and protein content.
  Anne Hadiyane , Rudi Dungani , Susana Paulina Dewi and Alfi Rumidatul
  Background and Objective: The chemical modification of wood was a chemical reaction between some reactive parts of wood components and a simple chemical reagent to form a covalent bond between both wood and chemical reagent. The utilization of jabon wood has long been done by the people of Indonesia. Jabon wood (Anthocephalus cadamba Miq.) is used for building materials, having quality of wood is not good such as dimensional stability. This study was to find out the effect of treatment of wood with styrene monomer using methyl methacrylamide in change in morphology structure and dimensional change. Materials and Methods: Jabon wood was impregnated with a styrene and methyl methacrylate to a strain of 50%. The changes in cell structure were analyzed to determine the effects of the treatment. Scanning Electron Microscopy (SEM) was used to determine the change in microfibril angle (MFA), preferred orientation of fiber (PO) and wood crystallinity (WC). Samples between the tangential sections were used for density measurement, as determined by the American Standard Testing and Material (ASTM) D2395 method. Furthermore, dimensional stability of the samples were calculated according to standard. Results: The wood density and volumetric swelling coefficient (SC) after modification of jabon wood showed a range of variation. The value of MFA in modified wood decreased significantly compared with the control. Wood modification results in an increase in the crystallinity. Cellulose crystallinity is reduced after impregnation, because the monomer groups interact with the groups in the volume of wood and occupy a larger space in the wood. Conclusion: The impregnation increased the dimensional stability of jabon wood (density and specific gravity).
  Tati Karliati , Ihak Sumardi , Atmawi Darwis and Alfi Rumidatul
  Background and Objectives: Adhesives are one of the most important ingredients in plywood industry. Black liquor (BL), a liquid comprising waste from the pulping process, was used to reduce adhesive consumption in plywood production. The characteristics of BL and properties of phenol-formaldehyde-based black liquor as an adhesive on the performance of jabon (Anthocephalus cadamba Miq.) plywood were investigated. Materials and Methods: Adhesive mixes were prepared using phenol-formaldehyde (PF) with the seven kraft BL-based adhesive added (0, 5, 10, 15, 20, 25 and 30% (w/w). Three-ply panels were produced at glue spread of 180 g cm–2 , then pressurized at 10 kg f cm–2 at a temperature of 140°C for four minutes (PF-BL plywood). The physical and mechanical properties of PF-BL plywood were analyzed according to Standard Nasional Indonesia (SNI) and Japanese Agricultural Standard (JAS). Results: The crystallinity of BL was 25.88%, mean while methanethiol (CAS) mercaptomethane, ethanedioic acid (CAS) oxalic acid, methanethiobis-(CAS) 2-thiapropane, phenol 2-methoxy-CAS guaiacol, phenol 2,6-dimethoxy-CAS 2,6 dimethoxy phenol were the dominant of chemical components in BL. Jabon plywood bonding with PF-BLadhesiveup to 30% of BL addition, met the SNI and JAS standards. The best treatment for PF-BL plywood was reached at 15% of BL addition. Conclusion: Up to 30% BL addition can be used to reduce PF resin in order to produce PF based plywood. BL was a potential material for decreasing the use of PF-based adhesive for plywood.
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