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Dr. Ratih Damayanti
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ratih_turmuzi@yahoo.com
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Research Center for Biomaterials,Indonesian Institute of Sciences Jl. Raya Bogor Km 46, Cibinong, Bogor 16911, Indonesia
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INDONESIA
Wood Research Journal : Journal of Indonesian Wood Research Society
Published by Masyarakat Peneliti Kayu Indonesia
ISSN : 20873840     EISSN : 27749320     DOI : 10.51850/wrj
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Wood Research Journal is the official journal of the Indonesian Wood Research Society. This journal is an international medium in exchanging, sharing and discussing the science and technology of wood. The journal publishes original manuscripts of basic and applied research of wood science and technology related to Anatomy, Properties, Quality Enhancement, Machining, Engineering and Constructions, Panel and Composites, Entomology and Preservation, Chemistry, Non Wood Forest Products, Pulp and Papers, Biomass Energy, and Biotechnology. Besides that, this journal also publishes review manuscripts which topics are decided by the Editors.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Kehutanan
Articles 157 Documents
 1   2   3   4   5 
Study on Mechanical Properties of Tropical Timber Hardwood Species: Promoting Javanese Inferior Timbers for Traditional Wooden Houses Yulianto P. Prihatmaji; Akihisa Kitamori; Satoru Murakami; Kohei Komatsu
Wood Research Journal Vol 3, No 1 (2012): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2012.3.1.44-54

Abstract

Recent earthquake hitting Java Island in Indonesia has caused many damaged to Javanese wooden houses, including Joglo-type building. The Traditional wooden houses use Teak wood or locally known as Jati (Tectona grandis) and Nangka wood (Artocarpus heterophyllus) as the primary construction material for both building structure and ornaments. Repair or reconstruction of the damaged house needs the same wood material (Teak wood) in order to get the same strength, durability, and prestige. Unfortunately, obtaining Teak wood in sufficient size is difficult because of limited quantity and very expensive price. Therefore, promoting substitute wood material having similar mechanical properties to Teak wood is needed. To understand the mechanical properties of timber for Javanese timber house, compression test, three point bending test, four point bending test and four point shear test were carried out in radial and tangential direction.In this paper, authors showed substitute wood materials for avanese timber houses from tropical timber. A total of 840 specimens made from 9 tropical timber species were tested. All tropical timber specimens showed that the MOE (Modulus of elasticity) had strong relationship with density. There was a clear trend that smaller density indicated smaller MOE. Yield stress described strong relationship with densities. From all specimens tested, shear modulus, shear strength and MOR showed quite strong relationship with densities. In terms of shear modulus, Acacia, Jati and Nangka had quite similar mechanical properties. For shear strength, Nangka closely resembled Jati while glued-Acacia had equal mechanical properties to Jati in terms of MOR.
Evaluation of Isolated Compounds from Wood of Artocarpus heterophyllus as A Cosmetic Agent Enos Tangke Arung; Kuniyoshi Shimizu; Ryuichiro Kondo
Wood Research Journal Vol 1, No 1 (2010): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2010.1.1.40-44

Abstract

In our efforts to find new whitening agent materials, we focused on wood of Artocarpus heterophyllus which is anti melanogenesis. By activity-guided fractionation of A. heterophyllus wood extract, norartocarpetin and artocarpesin were isolated which inhibited both mushroom tyrosinase activity and melanin formation in B16 melanoma cells. This compound is a strong candidate as a remedy for hyperpigmentation in human skin that can be used for cosmetic (whitening agent).
Phenol Contents and Antioxidant Activity of Sonokeling (Dalbergia latifolia Roxb) Wood Masendra Masendra; Denny Irawati; Alamratush Shoolichah Ridlo; Ganis Lukmandaru
Wood Research Journal Vol 11, No 1 (2020): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2020.11.1.27-34

Abstract

Dalbergia latifolia or sonokeling is a native species of Java, Indonesia, used as an important wood for furniture and building materials, due to the high of durability and beautiful color. This study, therefore, aim to investigate the phenol composition, represented by total phenolic,  flavonoid, and flavanol content, as well as antioxidant activity, conducted by DPPH (1, 1-diphenyl-2-picrylhydrazyl) method on Dalbergia latifolia wood. The sample was extracted using ethanol-toluene solvent in a Soxhlet apparatus, and subsequently subjected to column chromatography. This treatment yielded 12 fractions, which were then evaluated for phenol contents and antioxidant activity. The results showed a high antioxidant activity and total phenolic content in Fr.1- Fr.3, while latifolin was detected and characterized by GC-MS and a literature comparison. Therefore, it was established that the antioxidant activity of D. latifolia wood extractives properly correlated with the total phenolic, but not with the total flavonoid and flavanol contents.
Bioethanol Production from Several Tropical Wood Species using Simultaneous Saccharification and Fermentation Processes M. Daud; Wasrin Syafii; Khaswar Syamsu
Wood Research Journal Vol 3, No 2 (2012): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2012.3.2.106-116

Abstract

The study was conducted to determine the best method of hydrolysis (saccharification) and fermentation for bioethanol production using simultaneous saccharification and fermentation process. Three different tropical wood species namely gmelina wood (Gmelina sp.), pine wood (Pinus merkusii) and oil palm (Elaeis guineensis Jacq.) were pre-treated using kraft process and then converted into bioethanol using simultaneous saccharification and fermentation (SSF) processes. The pulp produced by kraft process was analized to determine their chemical properties before treatments. SSF was performed in 500 ml fermentors with total slurry of 200 ml. The substrate and nutrient media were autoclaved (121ºC and 20 min). The samples diluted to 2.5% (w/v) of total slurry were used as substrate. The enzyme preparation used commercial cellulase enzyme. The amount of cellulase added was 4 and 8% (w/w) of dry mass of samples. All SSF process was conducted by inoculating yeast Saccharomyces cerevisiae into fermentor in the amount of 10% (v/v) 1.5 x 109 CFU/cc. The SSF experiments run for 96 h, and the data were investigated periodically every 24 h. The results showed total sugar and reducing sugar tended to decrease with time of inoculation whereas ethanol concentration increases significantly. The growth of yeast Saccharomyces cerevisiae tended to incease in initial inoculation and decrease by the end of inoculation. The best method of hydrolysis (saccharification) and fermentation using SSF process for all tropical wood species tested were using cellulase 8% of dry mass (DM) and 10% (v/v) of Saccharomyces cerevisiae which produced bioethanol with concentration of 0.98; 0.57 and 0.51% for gmelina, pine and oil palm respectively and produced yields 11.21, 5.85 and 3.20%, in that order. 
Precise Structure of Acidic Polysaccharide Present in Salvia Hydrogels Rike Yudianti; Myrtha Karina; Masahiro Sakamoto; Jun-ichi Azuma
Wood Research Journal Vol 1, No 2 (2010): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2010.1.2.95-102

Abstract

Precise structures of acidic ß-(1,4)-xylan in the hydrogels from three species of Salvia (S. miltiorrhiza (SM), S. sclarea (SS) and S. viridis (SV)) were characterized. SS and SV contained two different acidic residues (4-O-methylglucuronic acid (MeGlcA) and glucuronic acid (GlcA)) substituted at O-2 of ß-(1,4)-linked xylopyranose residues, whereas MeGlcA is absent in SM. Molar ratios of xylose to uronic acid are 2.0 : 1.0 (SM), 1.7 : 1.0 (SS), 1.4 : 1.0 (SV). Distribution of acidic residues in the ß-(1,4)-xylan chains was analyzed by Matrix-Assisted Laser Desorption/Ionization (MALDI)/Time of Flight (TOF) mass spectroscopy after reduction and partial hydrolysis. The results showed that many series of ions appeared as sodium adducts [M+Na]+, indicating that uronic acid residues are randomly and mixed distributed in xylo-oligosaccharide chains in the SS and SV xylans. All species showed presence of oligosaccharides in ranges of m/z 833.3~2561.2 (SM), 657.2~1655.5 (SS) and 731.2~1421.5 (SV). Acidic residues in SS and SV are distributed in shorter xylo-oligosaccharides than those in SM, although complicated substituted profiles with MeGlcA and GlcA were similarly detected in SS and SV. Presence of long free xylan chains in the SM oligosaccharides supported lower number of substituent in its xylan backbone. 
Mycelia Growth of Shiitake (Lentinula edodes) on 4-Wood Species from Leguminaceae Family Dahayu Ratnanindha; Johanes Pramana Gentur Sutapa; Denny Irawati
Wood Research Journal Vol 10, No 1 (2019): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2019.10.1.26-31

Abstract

Cultivation of  Shiitake  mushroom  (Lentinula edodes)  in  Indonesia has  not  been  developed  yet,  due  to  its  low productivity. It happens because of the limited information of the good ways on cultivation Shiitake in Indonesia. One of the factors that affect the growth of mushroom is the media. In Indonesia, the information about the media composition by using various species of wood have not been found yet. Therefore, this research was conducted to determine the effect of using different wood species to the growth of Shiitake. This study used four wood species from the leguminaceae family, those were: Gamal (Glicidia sepium); Johar (Samanea saman); Leucaena (Leucaena leucocephala); and Sengon (Falcataria moluccana). Those were used as the media by adding 12.5% (w/w) of rice bran and 6% (w/w) of CaCO3, and adjusting  the moisture content by adding the distillate water to 65, 70, and 75%. Then, the media was put in to the petridisk (ø 90 mm) and inoculated with Shiitake mushroom. During the mycelia growth, the length of mycelia was measured every 2 days until fifty days, and then glucosamine content was analyzed. In addition, chemical analysis was also conducted to each media. The results showed that different wood species resulted different chemical content of media, except the acid soluble lignin content. The growth rate of mycelia was affected by the moisture content of media, meanwhile the glucosamin content is influenced by the moisture content and various species of wood. The best combination to cultivate the Shiitake mushroom was by using media made of gamal with 70% moisture content. There were positive correlation among the ethanol-toluen extracts content and the mycelia growth, however there was negative correlation among the hemicelullose content the mycelia growth.
Removal of Arabinose Substituents from Corn Pericarp Arabinoxylan Tomoki Yoshida; Wahyu Dwianto; Yoichi Honda; Hiroshi Uyama; Jun-ichi Azuma
Wood Research Journal Vol 4, No 1 (2013): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2013.4.1.41-45

Abstract

Partial acid hydrolysis of corn pericarp arabinoxylan (arabinose/xylose (A/X) ratio 0.35 and mean molecular weight of  53.6 × 103) was carried out at pH 1.0 for 1 ~ 6 h at 37 ~ 57 °C to remove arabinose substituents. The removal of arabinose could be described by regression analysis with the method of least squares. Following the regression profile, three kinds of desubstituted arabinoxylans having A/X ratios of 0.25, 0.12 and 0.03 with mean molecular weight values of 37.3 × 103, 15.6 × 103 and 7.2 × 103, respectively, could be prepared.  All corn pericarp arabinoxylans were in the amorphous state and the film formability of the native state was lost after the partial acid hydrolysis. 
In Search of Substitution Material for Traditional Javanese Wooden Houses Yulianto P. Prihatmaji; Akihisa Kitamori; Kohei Komatsu
Wood Research Journal Vol 2, No 1 (2011): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2011.2.1.46-53

Abstract

Many Javanese traditional timber structures have been destroyed by major earthquake. The impact of the disaster demanded a deeper finding on timber materials for repairing and reconstructing. To understand the mechanical property of timber for Javanese timber house, compression test were carried out for radial and tangential direction. Traditional joint construction use mortise and tenon system that stress yield in intersection occurred. Compression property and partial compression property is quite important for traditional joint construction. Especially, the mechanical properties against density of tropical timber were studied.                                In this paper, authors showed substitute materials for Javanese timber houses from tropical timber. A total of 288 specimens made from six tropical timber species were tested. All of tropical timber specimens showed strong relationship between Young’s modulus (E) and density. There was clear trend that the smaller density indicated the smaller Young’s modulus. Jati, Nangka, Sonokeling, Ketepeng and Acacia had similar increasing mechanical properties, while in the case of specimen Falcata, it mechanical properties were stagnant. The bigger density indicated the bigger Young’s modulus. Acacia and Ketepeng have MOE and density nearby Jati. Both of specimens has also similar tendency of mechanical properties with Jati.
Wood Properties of 5-year-old Fast Grown Teak Ratih Damayanti; Barbara Ozarska; I Ketut N. Pandit; Fauzi Febrianto; Gustan Pari
Wood Research Journal Vol 9, No 2 (2018): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2018.9.2.29-34

Abstract

Jati Unggul Nusantara (JUN) is one of fast growing plantation teak that has been widely cultivated in Indonesia. This teak has been developed to be harvested after 5 years when its diameter reaches 25-32 cm (diameter at breast high). The diameter of JUN is usually three times larger than the conventional plantation teak (teak cultivated from seed) at the same age, and the same as 30-40 year-old mature teak. Preliminary research was conducted to determine anatomical and selected physical properties of 5-year-old JUN teak, as well as its suitability for furniture production. The results revealed that wood color, texture, and grain pattern of JUN were slightly different from the mature conventional teak. The length of fiber cells was similar as in the mature teak. There were differences in ultramicroscopic structure of JUN: the mean micro fibril angle was narrower, and the crystallites degree was larger. Shrinkage values from green to 12% moisture content were:  0.70 (radial-R) and 1.62 (tangential-T), and from green to oven dry were 1.59 (R) and 3.29 (T). T/R ratio was 2.34. Specific gravity in air dry condition was 0.52. Based on the research results it appears that 5-year-old JUN may be suitable for the production of medium quality furniture products. More research is required to investigate and enhance the properties of JUN for high quality products.
Some of the Properties of Binderless Particleboard Manufactured from Bamboo Ragil Widyorini; Ari Puspa Yudha; Tibertus Agus Prayitno
Wood Research Journal Vol 2, No 2 (2011): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2011.2.2.89-93

Abstract

Bambo particles as a waste byproduct from bamboo processing industry are suggested to be a promising material for binderless particleboard. The quality of binderless particleboard is affected by several factors, such as pretreatment, pressing method, pressing condition, moisture content, and particle size. This study was focused on the effect of particle size and moisture content on the physical and mechanical properties of binderless particleboard from Petung bamboo (Dendrocalamus asper Backer) and conducted using the completely randomized design with two factors. Bamboo particles in three types of particle size, i.e. coarse (10~20 mesh), medium (20~60 mesh), and fine (passed 60 mesh), were used as materials for binderless board. Each particle size was then prepared for two moisture content conditions: air dry and 20±2%. Binderless boards were prepared by hot pressing at temperature of 200°C for 15 min, and the properties of the binderless boards were then evaluated according to the Japanese Industrial Standard for particleboard, JIS A 5908. The results showed that the binderless boards made from 20±2% moisture content particles showed better mechanical and dimensional properties than those made from air-dried particles. The binderless particleboard made from medium size and the moisture content of 20±2% recorded a modulus of rupture of 94 kg/cm², water absorption of 29%, thickness swelling of 5%, internal bond strength of 2.7 kg/cm², and modulus of elasticity of 19.490 kg/cm².

Page 1 of 16 | Total Record : 157

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