ABSTRACT
Introducción: existen distintos métodos para la obtención de soluciones concentradas de propóleos, utilizados por diferentes autores tanto en el ámbito nacional como internacional. En este trabajo se propone una variante del método Pichansky que consiste en una secuencia de pasos de extracción/filtración, para optimizar el proceso de obtención de soluciones alcohólicas concentradas de propóleos en el Centro de Inmunología y Biopreparados de Holguín. Objetivo: optimizar el proceso de obtención de las soluciones alcohólicas concentradas de propóleos que contribuya a eliminar contaminantes disueltos y elevar la calidad del producto final. Materiales y métodos: para la obtención de las soluciones se emplearon tres lotes experimentales y se realizaron tres extracciones alcohólicas sucesivas con filtraciones intermedias a temperatura controlada. Los parámetros de calidad se determinaron según procedimientos del Sistema de Gestión implantado, realizándose una comparación entre los lotes experimentales y los lotes elaborados posteriormente en el proceso de producción utilizando la misma variante del método de extracción. La información se procesó estadísticamente mediante un análisis de medias con el software Medcal. Resultados: en los resultados se obtuvieron valores óptimos de concentración de sólidos totales superior al 30% para todos los lotes ensayados de las soluciones concentradas, las propiedades organolépticas se encuentran dentro de los estándares de calidad establecidos. Conclusiones: se logró optimizar el proceso de obtención de la solución concentrada de propóleos manteniendo la conformidad del producto, lográndose un mejor agotamiento de la materia prima, teniendo en cuenta la incorporación de un tercer paso en el proceso de elaboración y la filtración a temperatura controlada.
Introduction: There are different methods to obtain concentrated propolis solution that have used by different national and international authors. In this document a variant of Pichansky method is proposed to optimize the process for obtaining concentrated propolis in the Immunology and Blood by Product Center. Objective: To optimize the process of obtaining concentrated propolis alcoholic solutions through a sequence of steps of extraction/filtration to remove dissolved contaminants and increase the quality of the final product. Materials and methods: To obtain solutions, three experimental plots were performed. This process was executed with three successive extractions using alcohol intermediate to temperature controlled. The quality parameters were determined according to procedures implemented of management system. A comparison was performed between experimental batches and batches subsequently produced with the change. The information was processed statistically by means of (means t-test) with Medcal software. Results: The optimal values of volume of total solids concentration above 30% were obtained for all tested batches of concentrated solutions, the organoleptic properties were found according to the standard quality. Conclusions: It was possible to optimize the process of obtaining the propolis concentrated solution of maintaining product compliance, achieving a better recovery of the first product due to considering the addition of a third step in the process with a controlled temperature.
ABSTRACT
Objective To study DNA quantification and STR typing of samples pre-treated with pyrami-don. Methods The blood samples of ten unrelated individuals were anticoagulated in EDTA. The blood stains were made on the filter paper. The experimental groups were divided into six groups in accor-dance with the storage time, 30 min, 1 h, 3 h, 6 h, 12 h and 24 h after pre-treated with pyramidon. DNA was extracted by three methods: magnetic bead-based extraction, QIAcube DNA purification method and Chelex-100 method. The quantification of DNA was made by fluorescent quantitative PCR. STR typing was detected by PCR-STR fluorescent technology. Results In the same DNA extraction method, the sample DNA decreased gradually with times after pre-treatment with pyramidon. In the same storage time, the DNA quantification in different extraction methods had significant differences. Sixteen loci DNA typing were detected in 90.56% of samples. Conclusion Pyramidon pre-treatment could cause DNA degradation, but effective STR typing can be achieved within 24 h. The magnetic bead-based extrac-tion is the best method for STR profiling and DNA extraction.
ABSTRACT
Six DNA extraction methods and four DNA purification methods were compared and analyzed in this study to get higher quality DNA from the rhizospheric soil of Fritillaria thunbergii Miq.Results showed that higher purity DNA were harvested by pretreating the soil with 20 mmol/L EDTA(pH 7.5),then isolating soil DNA with CTAB-SDS-frozen-thawing,and further purified by agarose method.The recovery rate of this soil DNA was about 44.00 ?g/g ? 2.65 ?g/g soil,and they were qualified for the microbial diversity analysis in the rhizospheric soil of F.thunbergii Miq based on the 16S rDNA sequence.
ABSTRACT
Crude glycosaminoglycan(CPG) from the whole viscera of Pinctada martensii was isolated with the two-enzyme hydrolysis and purified by the chromatograph.And the antitumor activity was studied with MTT colormetric assay. The CPG could be separated into two fractions(GAG-1, GAG-2) by the DEAE-52-cellulose ion exchange chromatograph. The contents of hexosamine of CPG,GAG-1, GAG-2 were 54.6%,50.0%,35.4%,respectively. The sulfate of GAG-2 was 13.8%. The inhibiting rates of CPG, GAG-1 and GAG-2 to HL-60 cells were 54.6%, 50.0% and 35.4%,respectively. The inhibition to HL-60 of 5-Fu could be increased by combined use with CPG, GAG-1 and GAG-2, GAG-1 was the main active fraction.