Liquid smoke has many benefits, especially in the food, fishery, timber, and plantation industries. It is used as a preservative or durability increased and aroma and taste addition in the food and fishery industry. In the wood industry, liquid smoke can resist termite attacks, while in the plantation industry, it functions as a latex coagulant containing antifungal, antibacterial, and antioxidants that can improve rubber product’s quality. Most of the rubber farmers in Bangka Belitung still use alum as a coagulant to coagulate their latex. However, alum coagulant can reduce the quality of the processed rubber material (bokar). The reason farmers use alum is that raw materials are cheap, therefore getting coagulant raw materials at low prices and not pollute the environment with a less moderate aroma/odor caused by non-recommended coagulant materials (alum) are needed. This study aims to apply liquid smoke as a natural coagulant in latex freezing. The research method used a Completely Randomized Design, with liquid smoke concentration replicated three times. Parameters observed were clotting time speed and organoleptic test for odor during 14 days of storage. The results showed that the best concentration of liquid smoke was 15% no odor and a clotting time of 8.23 minutes.

No abstract

This research predicts electronic properties (HOMO ILUMO energy diagram, UV-Vis spectrum, and the density of the HOMO / LUMO orbital) of cyanidin and petunidin organic dye compounds supported by TiO2. This system is modelled by interacting dyestuff compounds with the simplest TiO2 units to predict the effect of these dyes so that they can be applied in cells solar dye. A dye-sensitized solar cell is one generation of solar cells that has been widely studied to date. This solar cell uses substances colour as a sensitizer and become very interesting to be developed because of this requires low production costs but is able to produce performance pretty good. In this study computational calculations are performed using Gaussian 09W software with TD-DFT method (theory and base set B3LYP / 6-3 1G (d, p) for all atoms. The UV-Vis spectrum of cyanidin and petunidin compounds computed by computation light at wavelengths of 458.82 nm (cyanidin), 813.13 nm (cyanidin-TiO2) and 462.35 nm (petunidin), 782.83 nm (petunidin-TiO2). HOMO / LUMO energy diagram for cyanidin and cyanidin-TiO2 gives band gap of 1.9203 eV and 1.458 eV, respectively. Whereas petunidin and petunidin-TiO2 give band gap respectively of 1.9010 eV and 1.5477 eV.

No abstract

The increasing production of shrimp commodities in Bangka Belitung Island can cause shrimp shell waste and polluting the environment. Shrimp shell waste can further proceed into chitosan which has a wide range of functions in various fields. This current study aims to find out the influence of the deacetylation process in chitosan extracts from shrimp shell waste. The method of chitosan extraction by varying repetition of deacetylation process. The characterization of chitosan extracts by FTIR analysis to determine functional group and degree of deacetylation (DD). Based on FTIR spectra, repetition in the deacetylation process in chitosan extraction still produces chitosan extracts that do not fully transform into chitosan. However, it able to increase DD with the highest DD of chitosan extract constitutes 86,78% and can be used in the further application.