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Peronema Forestry Science Journal
Published by Universitas Sumatera Utara
ISSN : -     EISSN : -     DOI : -
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Arjuna Subject : -
Articles 304 Documents
 8   9   10   11   12 
Tingkat Kesukaan Konsumen Terhadap Teh Gaharu (Aquilaria malaccensis Lamk.) Berdasarkan Bentuk dan Ukuran serta Kandungan Antioksidan Simatupang, Jhonny; Batubara, Ridwanti; Julianti, Elisa
Peronema Forestry Science Journal Vol 4, No 1 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

Agarwood (Aquilaria malaccensis Lamk.) are now popular to be exploited by farmers as a healthy drink. This research was done to study the effect of the shape and size of the tea from agarwood leaves on the consumers acceptance and antioxidant content. Agarwood leaves tea made in three forms: whole leave, cutted and fine particle size. Agarwood tea from these three size of shape and size then were evaluated of their hedonic level at 0 day and after 2 months of storaged in room temperatur by 50 panelists. The antioxidant activity was evaluated on methanol extracts from the three kinds ofagarwood leaves tea by using DPPH method after 2 month of storage. The result of the research shows that the froporcle of agarwood leave tea was more liked by panelists followed by the cutted leaves tea and the whole leaves tea had the lowest value of the hedonic score. The same result was found on the agarwood leaves tea that had been storage for 2 months, in the term of aroma, color for aswell as taste. The hedonic score of arom, color and taste of agarwood leaves tea after 2 months of storage till more than 3,00. It showed that the agarwood leaves tea still was accepted by panelists. The result of antioxidant activity evaluation showed that the fine particle size of agarwood leaves tea had the highest antioxidant activity. The value of IC50 of the agarwood leaves tea from the whole, cutted an fine size leaves were 85,89; 150,01; and 73,02 ppm respectively. Keywords: Agarwood leaves, organoleptic, antioxidant activity, tea.
TINGKAT KEKUATAN ANTIOKSIDAN DAN KESUKAAN MASYARAKAT TERHADAP TEH DAUN GAHARU (Aquilaria malaccensis Lamk) BERDASARKAN POHON INDUKSI DAN NON-INDUKSI Putri Andaria Nasution; Ridwanti Batubara; Surjanto Surjanto
Peronema Forestry Science Journal Vol 4, No 1 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

During the long enough harvesting cycle, aloes leaves can be used as medicine and poured drink that has a role as antioxidants. This research was to study the societies predilection level to aloes tea and the strength of aloes leaves antioxidant activity based on the induction and non-induction tree. This research used 1,1-diphenyl-2-picrylhydrazil (DPPH) method with the observation parameter are the percentage of free radicals submerged at the 60th minute with different concentration (40 ppm, 60, ppm, 80 ppm and 100 ppm) and the value of IC50 (Inhibitory Concentration) was analyzed by regression similarity. The result of antioxidant activity observation by using the UV-Visible light Spectrophotometer at the swell length of 516 nm showed that the result of aloes leaves simplicia ethanol extract (EESDG) induction and non-induction had IC50 value of 99.42 ppm and 70.40 ppm. The result of EESDG had a significantly antioxidant activity. The hedonic test results showed that the stroge of aloes leaves for 0 month were the most predilection in the society due to the taste at induction treatment with the taste score 3.83 but due to the aroma and colour, had the same value 3.10 and 3.83. Aloes leaves tea at the 2 month storage which the most predilection in society was at the non-induction treatment, by the score of taste, aroma and colour were 3.30, 2.80 and 3.80. Keywords: Aloes tea, antioxidant activity, induction and hedonic test.
KELEMBAGAAN KELOMPOK TANI HUTAN DI KECAMATAN BARUSJAHE KABUPATEN KARO SUMATERA UTARA Laura Julita br Ginting; Ridwanti Batubara; Herianto Herianto
Peronema Forestry Science Journal Vol 4, No 1 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

Institutional has an important role in supporting the people’s forest management. The institution started from a group which has the same characteristics and purpose. The purpose of this study is to know the institutional system of forest farmer groups in the forest management, such as land management activities, structural and cultural aspects, institutional objectives, membership and leadership, and institutional capacity in the Rumanis Village, Pertumbuken Village, and Sikab Village. The results of this research showed that the land management activities include: land cleanup and nurseries, weeding, replanting, thinning, and fertilization. Leader in select based professionalism owned by the leadership. Institutional system of forest farmers groups in district of  Barusjahe has the same purpose to reduce deforestation and made members better. Institutional capacity is still as organizer of counseling and help to solved the problems of farmers. Keywords: Institutional, Farmers Group, Forest
KELEMBAGAAN KELOMPOK TANI HUTAN DI KECAMATAN BARUSJAHE KABUPATEN KARO SUMATERA UTARA br Ginting, Laura Julita; Batubara, Ridwanti; Herianto, Herianto
Peronema Forestry Science Journal Vol 4, No 2 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

Institutional has an important role in supporting the people’s forest management. The institution started from a group which has the same characteristics and purpose. The purpose of this study is to know the institutional system of forest farmer groups in the forest management, such as land management activities, structural and cultural aspects, institutional objectives, membership and leadership, and institutional capacity in the Rumanis Village, Pertumbuken Village, and Sikab Village. The results of this research showed that the land management activities include: land cleanup and nurseries, weeding, replanting, thinning, and fertilization. Leader in select based professionalism owned by the leadership. Institutional system of forest farmers groups in district of  Barusjahe has the same purpose to reduce deforestation and made members better. Institutional capacity is still as organizer of counseling and help to solved the problems of farmers. Keywords: Institutional, Farmers Group, Forest
UJI AKTIVITAS ANTIOKSIDAN EKSTRAK ETANOL DAUN GAHARU (Aquilaria malaccensis Lamk) BERDASARKAN UMUR POHON Reza Nugraha; Ridwanti Batubara; Herawaty Ginting
Peronema Forestry Science Journal Vol 4, No 1 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

Utilization of agarwood leaves(Aquilaria malaccensis Lamk.) suspected contain a chemical compound of the flavonoids those are flavones, flavonol and isoflavones so that the leaves used as brewed beverages which serve as antioxidant.Based on that description, researcher interested in knowing the content of chemical compounds class and test the antioxidant activity of ethanol extract of agarwood leaves (A. malaccensis Lamk.). previous research does not regard age of the tree which is taken its leaves, so that it needed to review that based on the age of the tree. This research used the trees in age 4 and 7 years  after  those were planted in the field. This study aims to knowing chemical compounds class that contain in agarwood leaves (A. malaccensis Lamk.) which have a function as antioxidant from the tree in age 4 and 7 years; and to knowing the  power of the antioxidant activity from ethanol extract of agarwood leaves in age 4 and 7 years. This research is based on the method of Badan Ditjen POM year 1995. Based on the result of phytochemicals screening test of simplicia powder and ethanol extract of agarwood leaves which are the compounds of flavonoids, glycosides, tannins, steroid/triterpenoids, all of that are the active compounds of antioxidant. The result of antioxidant activity test using beam spectrophotometer showed in a wavelength 516 nm at 42th minutes is the result of ethanol extract of agarwood leaves in age 4 and 7 years have 27,83  ppm and 27,76  ppm of IC50. The result of this test is known that ethanol extract of agarwood leaves in age 4 and 7 years have a very strong antioxidant activity. Keywords : Agarwood leaves, Antioxidant, Phytochemicals, Age, IC50
Pengaruh Ukuran Partikel dan Komposisi Semen- Partikel terhadap Kualitas Papan Semen dari Cangkang Kemiri (Aleurites Moluccana Wild) Ira Lestari Simbolon; Tit0 Sucipto; Rudi Hartono
Peronema Forestry Science Journal Vol 4, No 1 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

The Objective of this reseach were to evaluate partcile size and effect of cement- candle nut shell ratio to cement board quality, and  to determine optimum particle size and cementparticle ratio that resulting the best physical and mechanical properties of cement board. The size of board was 25 cm x 25 cm x 1 cm with density target was 1 g/cm3. The ratio of particle size were 30 & 80 mesh, and the cement particle ratio were 80:20, 70:30, 60:40. Magnesium cloride was used as catalys to accelerate hardening process. The physical and mechanical propertis of board was evaluated according to JIS A 5417-1992. The result showed that density, moisture content, water absortion thickness swelling, MOE & MOR were 1.00-1.08 gr/cm3; 7.45-11.56%; 5.28-7.02%; 6.12-7.70%; 1.89-4.40%; 4.34-7.90%; 5176-9158 kg/cm2 dan 45.51-62.08 kg/cm2, respectively. All the physical properties had fulfill standard requirement. Whereas MOR & MOE didn’t fulfilled JIS A 5417-1992. The best treatment in this research was particle size of 30 mesh and particle-cement composition of 80:20.   Keywords: cement board, candlenut shell, cement – particle ratio, physical and mechanical properties
Pemanfaatan Miang Bambu Betung (Dendrocalamusasper) Sebagai RacunTikus Utilization of “Miang”Dendrocalamus asper (bambu betung) as Rat Poison Frans Hutasoit; Yunus Afifuddin; Ridwanti Batubara
Peronema Forestry Science Journal Vol 4, No 1 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

The used chemically rodenticides to control  rodent pest can have a negatively impact on the environment and human life. Utilization of eco-friendly  natural materials  such as “miang “ Dendrocalamus asper(bambu betung)   is one kind of solution that is expected to be used as an alternative material to control rodent pest. This research purposed to determine the effectivenes of “miang” Dendrocalamus asper(Bambu Betung) against  mortality of white rats (Rattus novergicus, L.) by used the baits  mixed  with bamboo miang betung at various concentrations (0%, 5%, 10%, 15%, 20%) on rodent  morbidity and mortality rate . The results of this research  indicates that  mixing the bamboo miang into  baits,  effect on  mortality of rodent. The concentration of 10% of the measure is the most  effectivebecause has killed 100%  of  rats. This research indicates that miang bamboo high  toxicity and  very  potential to be develope as an eco-friendly plant-based rodenticides. Keywords: Dendrocalamus asper,miang, rat, rodenticides, mortality
PENGUJIAN KEAWETAN ALAMI PAPAN PARTIKEL DARI CAMPURAN LIMBAH BATANG SORGHUM DAN SERUTAN KAYU Andrianta Ginting; Irawati Azhar; Apri Heri Iswanto
Peronema Forestry Science Journal Vol 4, No 1 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

Sorghum stalk bagasse is potential raw materials to particleboard manufacture. In the previous research, sorghum bagasse particleboard had weakness matter in modulus of elasticity, internal bond and thickness swelling properties. Wood shaving mixture will be expected to improve of those properties. The objective of this research was to evaluate the effect of wood  shaving added to improve mechanical properties of particleboard.  Wood shaving type was added in particleboard manufacturing consist of Meranti, Cempedak, Mahoni, and Durian.  Sorghum bagasse and wood shaving ratio in this research was 50/50 (%w/w). Amount of 10% urea formaldehyde (UF) resin used for binding. Hot pressing process was conducted in 1300C temperature for 10 minute and 30 kg cm-2 pressure.  The result showed that, the thickness swelling (TS) does not fulfill of requirement JIS A 5908 (2003). Cempedak and Mahoni wood shaving mixture resulted of lower the TS value than control and other wood shaving mixture. In generally, wood shaving and sorghum bagasse mixture result in increasing of internal bond properties. Cempedak wood shaving resulted the best of bending properties than control and other mixture. Keyword : sorghum stalk, wood shaving, particleboard
Penghilangan Tinta Kertas Koran Bekas dalam Pembuatan Papan Komposit Plastik Afri Soni Wanson Samosir; Tito Sucipto; Lutfhi Hakim
Peronema Forestry Science Journal Vol 4, No 2 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

The objective of this research were to evaluate the effect of paper deinking on physical and mechanical properties of plastic composite board (fiber plastic composite). Deinking process using detergents with a concentration of 0%, 10%, 15%, 20%, and 25%. Clean pulp produced an acceptable material, while lathering ink that leaves the pulp was an rejected ingredient. The resulting composite board tested and their mechanical and physical properties compared to standard JIS A 5905-2003 hardboard S20 and JIS A 5908-2003 particleboards type 13. The results showed that the value of the density, moisture content, water absorption, thickness swelling, MOE, MOR, and IB were respectively from 0,61-0,69; 4,58-5,93; 29,62-39.81; 5,09-9,89; 0,96-1,22; 6,56-8,70; and 0,77-0,98. Testing that fulfill the standard requirement were testing the density, thickness swelling, and internal bond. Keywords: plastic composite board, polyethylene plastic, detergent concentration, physical and mechanical properties
KUALITAS PAPAN PARTIKEL DARI KOMPOSISI PARTIKEL BATANG KELAPA SAWIT DAN MAHONI DENGAN BERBAGAI VARIASI KADAR PEREKAT PHENOL FORMALDEHIDA Ahmad Roihan; Rudi Hartono; Tito Sucipto
Peronema Forestry Science Journal Vol 4, No 2 (2015): Peronema Forestry Science Journal
Publisher : Program studi Kehutanan USU

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Abstract

Oil palm trunk and mahogany’s particle can be used as material particle board. The aim of these study was to evaluated, particle board quality made from compositions of oil palm trunk and mahogany’s particle with several variation of phenol formaldehida adhesive and also to determine the best treatment of this research. Particle board made with size 25 cm x 25 cm x 1 cm. Composition variations particle oil palm trunk and mahogany were 100:0, 75:25, 50:50, 25:75 and the PF adhesive were 8%, 10%, 12%. The results were compared with the SNI 03-2105-2006 standard. This study used using a completely random experimental factorial design with 2 factors and 3 replication. The results showed that of density value was 0.50-0.59 g/cm3, moisture content was 8.43-11.09%, water absorption in immersion  for 2 hours was 35.68-58.64%, and 24 hours was 56.01-77.43%. Thickness swelling on immersion for 2 hours was 4.76-10.15%, and 24 hours was 9.73-13.07%, the value of the MOE was 6170-9594 kg/cm², MOR values was 52.37-81.62 kg/cm². Variations of the PF adhesive and composition oil palm trunk and mahogany’s particle doesn’t give the effect of physical and mechanical properties significantly except density. All of MOE and MOR value didn’t fulfill the standards, where as but the density, moisture content value had fulfilled SNI 03-2105-2006 standards. The best treatment in this results was at 75:25 and adhesive 8%. Keywords: oil palm trunk, mahogany’s, phenol  formaldehyde, physical and mechanical, particle board.

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