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1.
Gac. méd. espirit ; 21(2): 134-145, mayo.-ago. 2019. graf
Article in Spanish | LILACS | ID: biblio-1090435

ABSTRACT

RESUMEN Fundamento: Los fructanos tipo inulina de cadena corta se nombran fructooligosacáridos (FOS) y son considerados prebióticos al beneficiar la salud del huésped. Objetivo: Analizar tres de los más importantes beneficios a la salud de los fructanos tipo inulina como prebióticos. Metodología: Se revisaron documentos publicados en diferentes bases de datos (PubMed, Medline, NCBI) en idioma inglés. Se escogieron los que aportaron datos sobre la influencia de los prebióticos en la microbiota intestinal, la obesidad y la saciedad. Se utilizó el método de análisis documental para evaluar los resultados de diferentes ensayos clínicos. Resultados: Se revisaron un total de 70 artículos, de los cuales se seleccionaron 49 que contenían ensayos clínicos controlados y evidencias sobre los efectos beneficiosos en la salud de los fructanos tipo inulina. Conclusiones: Los fructanos tipo inulina en general, y los fructooligosacáridos en particular, al ser fermentados en el tracto gastrointestinal producen ácidos grasos de cadena corta; estos productos de la fermentación favorecen el desarrollo de microorganismos beneficiosos en detrimento de otros perjudiciales. De igual forma los ácidos grasos de cadena corta pueden regular el metabolismo de los lípidos y la sensación de saciedad.


ABSTRACT Background: Short-chain inulin-type fructans (ITF) are named fructooligosaccharides (FOS) and considered prebiotics to benefit the health of the host. Objective: To analyze three of the most important health benefits of inulin-type fructans as prebiotics. Methodology: Documents published in different databases (PubMed, Medline, NCBI) in English were reviewed. Those which provided data on the influence of prebiotics on the gut microbiota, obesity and satiety were chosen. The documentary analysis method was used to evaluate the results of different clinical trials. Results: A total of 70 articles were reviewed, of which 49 were selected and contained controlled clinical trials and evidence of the beneficial health effects of inulin-type fructans. Conclusions: Inulin-type fructans in general, and fructooligosaccharides (FOS) in particular, when fermented in the gastrointestinal tract produce short-chain fatty acids (SCFA); these fermentation products favor the development of beneficial microorganisms to the detriment of other harmful ones. Similarly, short chain fatty acids can regulate lipid metabolism and satiety.


Subject(s)
Prebiotics , Gastrointestinal Microbiome , Fructans
2.
Gac. méd. espirit ; 21(2): 134-145, mayo.-ago. 2019. graf
Article in Spanish | CUMED | ID: cum-76894

ABSTRACT

RESUMEN Fundamento: Los fructanos tipo inulina de cadena corta se nombran fructooligosacáridos (FOS) y son considerados prebióticos al beneficiar la salud del huésped. Objetivo: Analizar tres de los más importantes beneficios a la salud de los fructanos tipo inulina como prebióticos. Metodología: Se revisaron documentos publicados en diferentes bases de datos (PubMed, Medline, NCBI) en idioma inglés. Se escogieron los que aportaron datos sobre la influencia de los prebióticos en la microbiota intestinal, la obesidad y la saciedad. Se utilizó el método de análisis documental para evaluar los resultados de diferentes ensayos clínicos. Resultados: Se revisaron un total de 70 artículos, de los cuales se seleccionaron 49 que contenían ensayos clínicos controlados y evidencias sobre los efectos beneficiosos en la salud de los fructanos tipo inulina. Conclusiones: Los fructanos tipo inulina en general, y los fructooligosacáridos en particular, al ser fermentados en el tracto gastrointestinal producen ácidos grasos de cadena corta; estos productos de la fermentación favorecen el desarrollo de microorganismos beneficiosos en detrimento de otros perjudiciales. De igual forma los ácidos grasos de cadena corta pueden regular el metabolismo de los lípidos y la sensación de saciedad.


ABSTRACT Background: Short-chain inulin-type fructans (ITF) are named fructooligosaccharides (FOS) and considered prebiotics to benefit the health of the host. Objective: To analyze three of the most important health benefits of inulin-type fructans as prebiotics. Methodology: Documents published in different databases (PubMed, Medline, NCBI) in English were reviewed. Those which provided data on the influence of prebiotics on the gut microbiota, obesity and satiety were chosen. The documentary analysis method was used to evaluate the results of different clinical trials. Results: A total of 70 articles were reviewed, of which 49 were selected and contained controlled clinical trials and evidence of the beneficial health effects of inulin-type fructans. Conclusions: Inulin-type fructans in general, and fructooligosaccharides (FOS) in particular, when fermented in the gastrointestinal tract produce short-chain fatty acids (SCFA); these fermentation products favor the development of beneficial microorganisms to the detriment of other harmful ones. Similarly, short chain fatty acids can regulate lipid metabolism and satiety.


Subject(s)
Aged , Prebiotics , Gastrointestinal Microbiome , Fructans
3.
Rev Latinoam Microbiol ; 44(1): 14-8, 2002.
Article in English | MEDLINE | ID: mdl-17061510

ABSTRACT

The Thermus aquaticus DNA Polymerase I (Taq Pol I) gene was cloned into the pOSEX4 plasmid under the osmo-inducible promoter proU and subsequently expressed into the Escherichia coli MKH13 strain. The suitability of the enzyme in polymerase assays was determined in standard 35S dATP incorporation tests and by PCR. The Taq Pol I expression in this system, which is under the control of the osmotic pressure in the growth medium, was analyzed in different media and in different sodium chloride concentrations. A study of the osmolarity effects in the growth of the strain and in Taq Pol I expression shows that an increase in sodium chloride concentration limits the growth. At 0.25 M of NaCl maximum activity was observed; at higher values of osmolarity, we found an unexpected decline of activity. This is the first report of using the pOSEX vector for the expression of an heterologous protein and it is very advantageous to make a regulated, non toxic, simple and cost-effective manner of induction in a biotechnology process using just NaCl or other non-permeable osmolyte.


Subject(s)
Escherichia coli/enzymology , Gene Expression Regulation, Bacterial , Osmosis , Taq Polymerase/genetics , Biotechnology , Culture Media/pharmacology , Dose-Response Relationship, Drug , Enzyme Induction/drug effects , Escherichia coli/drug effects , Escherichia coli/growth & development , Gene Expression Regulation, Bacterial/drug effects , Genetic Vectors/genetics , Industrial Microbiology , Osmolar Concentration , Promoter Regions, Genetic/genetics , Recombinant Fusion Proteins/biosynthesis , Recombinant Fusion Proteins/genetics , Saline Solution, Hypertonic , Taq Polymerase/biosynthesis
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