Judul: Kadar Tektokuinon pada Ekstrak Kayu dan Kulit Jati (Tectona grandis L.f) Jawa Barat dan Jawa Timur
Abstrak: Tektokuinon merupakan senyawa utama dalam ekstraktif kayu Jati yang berperan terhadap keawetan alaminya. Kadar dan komposisi ekstraktif dapat dipengaruhi oleh jenis, umur, bagian dalam kayu, dan lokasi tempat tumbuh. Pengetahuan tentang kadar tektokuinon dalam kayu Jati berdasarkan lokasi dan bagian kayu yang berbeda akan menjadi informasi penting terkait sifat dasar kayu dan potensi pemanfaatan komponen kimia kuinon dalam kayu Jati. Penelitian ini bertujuan untuk mengukur kadar ekstrak kuinon dan tektokuinon dalam kayu dan kulit Jati asal Jawa Barat dan Jawa Timur dengan menggunakan pelarut etanol dan toluena. Ekstraksi dilakukan dengan metode sokletasi menggunakan pelarut etanol dan toluena perbandingan volume 1:1, 1:2, dan 2:1. Penentuan konsentrasi relatif kuinon, antrakuinon, dan tektokuinon dalam ekstrak menggunakan Pyrolisis-Gas Chromatography Mass Spectrometry (Pyr-GCMS).
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Judul: Kadar Komponen Kimia Kayu dan Kulit Jati (Tectona grandis Linn f.) Asal Jawa Barat dan Jawa Timur
Abstrak: Teak wood (Tectona grandis Linn f.) is well known as a high value of wood species due to high durability, dimensional stability, and strength, as well as high value in the decorative properties of wood. The processing of teak wood into various wood products produces a lot of biomass waste, such as bark and wood residue. The potential utilization of teak wood biomass residue is not only as a raw material of wood products but also as natural chemical resources. This research aims to analyses chemical components of bark and wood residue of teak wood from West and East Java, including holocellulose, alpha-cellulose, Klason lignin, acid soluble lignin, syringyl-guaiacyl ratio of lignin, and extractives content. Bark contains higher holocellulose and alpha-cellulose, and lower lignin content than that of wood residue. In addition, teak bark lignin consists of siringil-guaiacyl ratio higher than lignin of wood sample. Generally, teak wood from West Java contains higher polysaccharides and extractives with lower lignin content than teak wood from East Java. Due to high content of polysaccharides and low content of lignin, teak bark biomass might be promoted as raw materials for pulp and bioethanol productions.
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Judul: Antibody Responses against Newcastle Disease and Evaluation of Infectious Bronchitis Maternal Derived Antibody on Vaccinated Layers.
Abstrak: Information of maternal derived antibody (MDA) and onset of immunity after vaccination is important to determine appropriate vaccination programme of chickens. The aim of this study was to evaluate duration of Infectious Bronchitis (IB) MDA and evaluate onset of immunity Newcastle Disease (ND) vaccination among layers. All layers were vaccinated using live ND and Infectious Bursal Disease (IBD) at one day old age, and received Avian Rhinotracheitis (AR) vaccine at 4 day old age. Serum samples were collected at various ages: 7, 10, 14, 20, 22, 24, 29 and 35 day old. The presence of ND antibodies was measured by the hemagglutination inhibition (HI) test, whilst the presence of IB antibodies was measured by enzyme-linked immunosorbent assay (ELISA). Our study showed that ND antibodies were at positive level until 24 day old age, and reached protective level ≥ 25 only at 7 day old age, whilst IB MDA were positive up to 17 day old age. This result indicating the needs of ND booster vaccination at least at 24 day old and IB vaccination at 17 day old age.
Keyword: antibody, Infectious Bronchitis, layers, Newcastle Disease, vaccination