Microcrystalline cellulose: Isolation, characterization and bio-composites application-A review.

Characterization of raw and alkali treated new natural cellulosic fibers from Tridax procumbens

Isolation and characterization of microcrystalline cellulose from roselle fibers.

Functionality and nutritional aspects of microcrystalline cellulose in food.

Microcrystalline cellulose from Posidonia oceanica brown algae: Extraction and characterization

Properties of microcrystalline cellulose extracted from soybean hulls by reactive extrusion

Films based on cassava starch reinforced with soybean hulls or microcrystalline cellulose from soybean hulls

Biodegradable plastic designed to improve the soil quality and microbiological activity

The use of starches in food and materials areas requires processing at elevated temperatures. The study of thermal degradation kinetics of starches and their relationship with amylose content, crystallinity, viscosity and thermal properties can help to design the processing conditions. The crystallinity and ordering of corn, cassava and waxy maize starches determined by means of X-ray diffraction (XRD) and Fourier Transform infrared spectroscopy (FTIR), respectively. Correlation between crystallinity, viscosity and amylose content was found. The kinetic parameters (activation energy (Ea), order and pre-exponential factor (A)) were determined through three models: Coats-Redfern, Broido and van Klevelen, using the best linear fit method. The overall order of thermal degradation process of all the starches was found to be of first order. The Ea increases following the order: corn < cassava < waxy maize. The higher A and Ea values found for waxy maize starch indicate that structural differences influence the thermal degradation process.

Waxy maize, corn and cassava starch: Thermal degradation kinetics

As industrias texteis, durante o processo de tingimento, liberam uma grande quantidade de corantes na agua. Alem do seu efeito visual e seus impactos adversos em relacao a fotossintese e demanda quimica de oxigenio, muitos corantes sinteticos sao toxicos, recalcitrantes, mutagenicos e carcinogenicos. Dessa forma, novas alternativas de tratamento dos efluentes gerados, menos agressivas ao meio ambiente, de baixo custo e renovaveis tem sido buscadas, como o uso de residuos agroindustriais lignocelulosicos, como adsorventes de corantes. Neste estudo, cana-de-acucar e fibras de coco foram estudadas quanto a capacidade de adsorver o corante Remazol Brilliant Blue BB e investigar os efeitos do tempo, pH, quantidade de material adsorvente e concentracao de corante na adsorcao do corante. O melhor tempo de adsorcao foi de 24 h para fibra de coco e 12 h para fibra de cana-de-acucar. Para ambas as fibras, o pH otimo para a adsorcao do corante foi 2, e o uso de 20 g L-1 de fibra foi o mais efetivo para remover 50-200 mg L-1 de Remazol Brilliant Blue BB, com porcentagens de adsorcao acima 90,50% observados para ambas as fibras. Palavras-chave: Corantes texteis, adsorcao e fibras lignocelulosicas.

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Papers

Properties of microcrystalline cellulose extracted from soybean hulls by reactive extrusion

Films based on cassava starch reinforced with soybean hulls or microcrystalline cellulose from soybean hulls

Biodegradable plastic designed to improve the soil quality and microbiological activity

Waxy maize, corn and cassava starch: Thermal degradation kinetics

Avaliação de diferentes fatores na remoção de remazol brilliant blue de soluções aquosas por adsorção em fibras de cana de açúcar e coco verde