Thin polymeric films were developed for the vapor-phase sequential colorimetric detection of a nerve agent mimic and ammonia with high sensitivity. N-(4-Benzoylphenyl)acrylamide (BPAm), N,N-dimethylacrylamide (DMA), and (E)-2-(methyl(4-(pyridine-4yldiazenyl)phenyl)amino)ethyl acrylate (MPDEA, M1) were copolymerized via free radical polymerization (FRP) to yield p(BPAm-co-DMA-co-MPDEA), hereafter referred to as P1. P1 exhibits selective sensing properties toward diethyl chlorophosphate (DCP), a nerve agent mimic, in pure aqueous media. Upon the addition of DCP, the pyridine groups of P1 were quaternized with DCP, accompanied by a color change from yellow to pink due to the enhancement of the intramolecular charge transfer (ICT) effect. In situ generated quaternized P1, hereafter referred to as P2, after DCP sensing was used to selectively detect ammonia via dequaternization in an aqueous medium. Ammonia detection was indicated by a color change in the solution from pink back to yellow. A surface-immobilized P1 film was prepared and employed for the vapor-phase detection of DCP, demonstrating that an amount of as low as 2 ppm was detectable. Ammonia vapor was also successfully detected by the P2 film via the ammoniatriggered removal of the quaternized phosphates. Alternating exposure of the film to DCP and ammonia resulted in the corresponding color changes, thereby demonstrating the reversibility of the system. The reusability of the polymeric film for detecting DCP and ammonia in the vapor phase was confirmed by performing four sequential colorimetric detection cycles.
The aim of this study is to evaluate the economic feasibility of manufacturing hydroxyapatite nanoparticles from eggshell waste. The economic analysis perspective is carried out by calculating various economic parameters, namely gross profit margin (GPM), payback period (PBP), break event point (BEP), internal rate return (IRR), creating net present value (CNPV), return on investment ( ROI) and profitability index (PI). The results show that the production of hydroxyapatite nanoparticles from eggshell waste is prospective. Technical analysis to produce 30,150 Kg of hydroxyapatite per year shows the total cost of equipment purchased is Rp. 230,580,000.00, and the total cost of raw materials is Rp. 890,235,720.00. The profit obtained from the sale of the product is Rp. 4,520,803,500.00/year. Within 20 years of the construction of this project, using eggshells as a raw material for production can reduce the accumulation of eggshell waste. This project can compete with PBP capital market standards due to the short return on investment of around 3 years. To ensure feasibility, the project is estimated from ideal to worst case conditions in production, including labor, sales, raw materials, utilities, as well as external conditions (taxes and subsidiaries). The benefits of this research are that it can provide information on the economic feasibility of manufacturing hydroxyapatite nanoparticles on a large scale, and can optimize/develop projects for further investigation.
This study aimed primarily to investigate the effect of Zn-Proteinate (Zn-Prot) supplementation on in vitro rumen digestibility and rumen fermentation. This research used a completely randomized design with four treatments and four replicates. The experimental treatment was the supplementation of various levels of Zn-Prot (0; 12.5 ppm; 25 ppm, and 37.5 ppm) on a dry matter basis. Parameters determined were in vitro dry matter digestibility (IVDMD), in vitro organic matter digestibility (IVOMD), partial volatile fatty acid (VFA) (acetate, propionate, and butyrate), A/P ratio, CH4, and the efficiency of the conversion hexose to VFA. Data were analyzed using ANOVA. The results showed that goats fed with a diet supplemented with 25 ppm Zn-Prot had the highest IVDMD and IVOMD values. There was no significant effect on the VFA and CH4 concentrations, A/P ratio, and the efficiency of the hexose-VFA conversion within treatment groups. In conclusion, supplementing 25 ppm of Zn-Prot into the diet of dairy goat increase the dry matter and organic matter digestibility.
Hydrogen peroxide (H 2 O 2 ) is an important reactive oxygen species (ROS) that plays a significant role in many biological systems. A new water-soluble polymeric probe appended with pyrene and boronic acid groups was designed and synthesized for the detection of H 2 O 2 . Glycidyl methacrylate (GMA) and N,Ndimethylacrylamide (DMA) were copolymerized by reversible addition-fragmentation chain-transfer (RAFT) polymerization to yield poly(glycidyl methacrylate-co-dimethylacrylamide) [p(GMA-co-DMA)] (P1). The subsequent ring-opening reaction between the secondary amine of (3-((pyren-1-ylmethyl)amino) phenyl)boronic acid with the epoxide unit of P1 yielded a target polymer, P2. In the presence of H 2 O 2 , the phenyl boronic acid group of P2 transformed to a phenol group, which was accompanied by turn-off fluorescence. P2 also exhibited pH-tunable detection sensitivity. This polymeric probe is anticipated to promote the development of stimuli-responsive water-soluble polymers with fluorescence-sensing behaviors.
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