With an increase in the organic acid requirement, the publication of organic acids recovery has been increased over the years.

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Purpose The shell of cocoa beans is one of the cocoa industry byproducts that currently still become waste. Through this research, utilization of cocoa bean shell for producing alkalized fiber powder was observed. The aim of the study is producing fiber powder from the shell of cocoa beans. Methods The shell of cocoa beans was obtained from the chocolate industry and directly used without any pretreatment. The shell of cocoa beans was alkalized to adjust the pH and remove the possible heavy metal. At the end of the alkalization process, the solid material was measured by atomic absorption spectroscopy (AAS). Later, the solid material was crushed into 30-200 mesh. The possibility for this powder to substitute other fiber powders (oat and whole wheat) was tested by texture profile analysis (TPA) and panelists test for cookies produced of those powders. Results The experiment shows that an increase in temperature will cause the product's color to be more red and yellow, lowering the powder yield, and also increase the coarse fiber content of the alkalized-product. Conclusions Powder size analysis, TPA, and acceptance test show that the produced cocoa powder can be utilized for a substitution or mixing flour as there is no significant difference observed among them. It contains rich fiber that is important for dietary food.

Cocoa bean skin is a waste of chocolate industries that mostly contains hemicellulose, cellulose, and lignin. This material shows to be a promising feedstock for the production of liquid smoke and charcoal. The study was aimed to analyse the influence of temperature and heating rate of cocoa bean skin pyrolysis to the production of liquid smoke. Optimization of pyrolysis process variables, i.e. by adjusting the suitable temperature and heating rate, is the key to obtain a high-quality product. The pyrolysis process was carried out using heating rates between 5°C/min and 15°C/min at three pyrolysis temperatures of 450°C, 500°C, and 550°C. The yield of the produced liquid smoke was in the range of 18-23%. It showed that at a faster heating rate, the reaction produced more charcoal, ash, and water content for all pyrolysis temperatures. The highest yield of charcoal was ca. 39% with a caloric value of 22.97 MJ/kg, while the lowest ash and water content was in the range of 16.5-19% and 6.5-8.5%, respectively. This result shows that the utilization of this organic waste compounds could be promising for large-scale production.

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