Physicochemical Characteristics of Chicken Eggshell Flour Produced by Hydrochloric Acid and Acetic Acid Extraction

Backgrdound: Several previous researchers have prepared chicken eggshell flour using hydrochloric acid (HCl) and acetic acid (CH3COOH) solvents. However, the results of the physicochemical characteristics still very diverse. This study aims to produce chicken eggshell flour using two different types of solvents (4% HCl and CH3COOH 2N) and determine the proper solvent to obtain better physicochemical characteristics. Method: This type of research was descriptive quantitative. The research stages initiated by preparing chicken eggshell samples by maceration using 4% HCl and CH3COOH 2N. Afterward, chemical characteristics (moisture content, ash, calcium carbonate, calcium, and phosphorus) and physical characteristics (yield) of eggshell flour were determined. Processing and data conducted by using the IBM SPSS statistic program Result: The higher levels of calcium, calcium carbonate, phosphorus, ash, yield, and lower water content of the eggshell powder were generated by extraction using 4% HCl than 2N acetic acid (CH3COOH). Conclusion: The physicochemical characteristics of the eggshell powder extracted from the 4% HCl were better than the 2N acetic acid (CH3COOH)

The effect of acetic acid extraction time on the dissolution of lead and cadmium in ceramic tiles

With the improvement of people's living standard, the glazed tiles will be decorated with some colored glaze materials in order to increase strength and surface decoration effect, and these ceramic tiles containing lead and cadmium will be dissolved out under the action of acid. The dissolved lead and cadmium and other heavy metals after inhalation will affect the human liver, nervous system, hematopoiesis, and even paralysis. The Influence of detection mechanism and detection time on the results is discussed in this paper.

Physicochemical Properties of Gelatin Extracted from Fivelined Threadfin Bream (Nemipterus tambuloides) Skins

<p>Gelatin has been extracted from fivelined threadfin bream fish using 0.05 M acetic acid. Extraction process was carried out at varying temperature of 60, 80 and 95oC for 3 h. Result indicated that extraction at 80oC showed the highest gel strength (187 Bloom) with viscosity of 12 cP. In fact, it produced the lowest yield (30.45%) with melting point of 31.67oC. Higher gelatin yield was shown by extraction at 95oC (38%) and the higher melting point was shown by extraction at 60oC and 95oC (around 34oC). Amino acids composition of the selected gelatin was similar to that of bovine gelatin. At concentration of 1-3% (w/v), emulsion stability index (ESI) of fish gelatin was lower than bovine gelatin. Emulsion activity index (EAI) was dependent on the gelatin concentration, at level of 1% and 2%, EAI of fish gelatin was considerably higher than bovine gelatin. At gelatin 3%, EAI of fish gelatin and bovine gelatin was similar. It suggests that the gelatin from fivelined threadfin bream skin has comparable physicochemical properties against bovine gelatin.</p><p><strong>Keywords</strong>: Fivelined threadfin bream, gelatin, physicochemical properties. </p>

50 kGy of gamma irradiation does not affect the leachability of mineral soils and sediments

Sterilization of soils and sediments can release them from quarantine restrictions. Gamma irradiation is effective at sterilization but can damage materials and in so doing affect their suitability for environmental research. Duplicate samples of a wide range of mineral soils and sediments were subject to an acetic acid extraction before and after 50 kGy gamma irradiation. This amount of gamma irradiation did not affect the leachability of a range of analytes from the soils and sediments.