Judul: Microfibrillated cellulose of banana stem as plastic film material
Abstrak: Batang pisang merupakan limbah lignoselulosa yang kandungan selulosanya bisa diisolasi dan dimanfaatkan sebagai bahan baku pembuatan film plastik. Selulosa berhasil diisolasi menggunakan metode kimia mekanik dan didapatkan selulosa mikrofibril dengan ukuran partikel 920 nm. Analisis gugus fungsi menggunakan spektroskopi inframerah membuktikan bahwa hasil isolasi adalah benar selulosa. Selulosa mikrofibril hasil isolasi dicampurkan dengan pati jagung dan gliserol sebagai pemlastis. Ragam pati jagung yang digunakan adalah 1.5, 1.75, 2.0, dan 3.0 g. Selulosa mikrofibril dan gliserol yang ditambahkan pada tiap ragam adalah 2.5 dan 1 g. Film plastik dengan jumlah pati 1.5 g menghasilkan nilai kuat tarik paling tinggiyaitu 13 MPa dan memiliki nilai permeabilitas uap air paling rendah, yaitu 2.3 ng m m-2 s-1 Pa-1. Film plastik yang mengandung pati 3.0 g memiliki elongasi paling tinggi, yaitu 11%. Mikrograf elektron parayan menunjukkan distribusi campuran film telah homogen., Banana stem is a waste that contain lignoselulose from which cellulose can be isolated and used as raw material for plastic film. Cellulose was sucessfully isolated by mechanical chemical method giving 920 nm microfibrils. Functional group analysis by infrared spectroscopy proved that the isolated material was cellulose. The isolated microfibrils was mixed with corn starch and glicerol as plastisizer. Corn starch was added at various composition, i.e. 1.5, 1.75, 2.0, and 3.0 g. The microfibrillated cellulose and glicerol added into corn starch were 2.5 and 1 g, respectively. The plastic film with 1.5 g corn starch showed the highest tensile strength1 of 3 MPa and the lowest water vapor permeability 2.3 ng m m-2 s-1 Pa-1. The plastic film with 3 g corn starch gave the highest elongation rate of 11%. The scanning electron micrograph showed that the film component distribution was homogeneous. Keywords: cellulosemicrofibril, physical-mechanical properties, plastic film, water vapor permeability
Keyword: film plastik, selulosa mikrofibril, sifat fisik-mekanik, permeabilitas uap

Judul: Studi Literatur Bioplastik Berbasis Komposit Pati Bonggol Pisang dan Selulosa Sabut Kelapa Muda sebagai Kemasan Makanan Kering
Abstrak: Bioplastik merupakan alternatif untuk mengurangi masalah yang ditimbulkan oleh plastik yang terbuat dari polimer sintetik. Penelitian ini bertujuan mengkaji potensi bioplastik berbasis komposit pati bonggol pisang dengan penambahan selulosa sabut kelapa muda yang diaplikasikan sebagai kemasan makanan kering. Penelitian ini menggunakan metode studi literatur. Bonggol pisang dapat digunakan sebagai bahan dasar pembuatan bioplastik karena memiliki kandungan pati yang tinggi. Sabut kelapa muda dapat digunakan sebagai bahan penguat untuk bioplastik berbasis pati karena memiliki kandungan selulosa yang tinggi. Berbagai penelitian telah menggunakan berbagai jenis selulosa sebagai bahan penguat dalam pembuatan bioplastik dari berbagai jenis pati. Penambahan selulosa terbukti mampu meningkatkan kekuatan tarik dan ketahanan air dari film pati. Dengan demikian, pati bonggol pisang dapat dipadukan dengan selulosa sabut kelapa muda sehingga diperoleh bioplastik komposit dengan sifat dan karakter yang lebih baik. Aplikasi dari bioplastik tersebut akan lebih baik jika digunakan sebagai kemasan makanan kering dikarenakan ketahanan air dari bioplastik yang masih rendah., Bioplastics are an alternative to reduce the problems caused by plastics made from synthetic polymers. This research aims to evaluate the potential of bioplastics based on banana tuber starch composites with the addition of young coconut coir cellulose as dry food packaging. This research used the literature study method. The banana tuber has been selected as a raw material for producing bioplastics because it has a high starch content. Young coconut coir can be used as a filler for starchbased bioplastics because it has a high cellulose content. Recent studies have used various types of cellulose as a filler in the manufacture of bioplastics from many types of starch. Cellulose was proven to increase the starch film’s tensile strength and water resistance. Thus, banana tuber starch can be composited with young coconut coir cellulose to obtain a composite bioplastic with better properties and characteristics. The application of these bioplastics would be better if used as dry food packaging due to the low water-resistance of bioplastics.
Keyword: banana tuber, bioplastics, coconut coir, composites, food packaging

Judul: Query Expansion based on Bilingual Dictionary Using Conditional Probability
Abstrak: Query expansion is a technique that can be used to bridge vocabulary gaps between queries and documents in the collection. With query expansion, user will be helped to formulate queries well so that user will optimize the search result. In this study, the expansion term was resulted from the translation of bilingual dictionary. Subsequently, several terms of expansion were elected based on the closeness of its relationship with the original query. This research showed that conditional probability can be used to select expansion term in bilingual translation method query expansion. The result of 1000 documents was more than 97% relevan document can be retrieved by this system. The more expansion term used, the larger number relevan document was retrieved.
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