ABSTRACT
Freezing is widely used in food preservation, but if not carried out properly, ice crystals can multiply (nucleation) or grow (recrystallization) rapidly. This also affects thawing, causing structural damage and affecting overall quality. The objective of this review is to comprehensively study the cryoprotective effect of antifreeze proteins (AFPs), highlighting their role in the freeze-thaw process of food. The properties of AFPs are based on their thermal hysteresis capacity (THC), on the modification of crystal morphology and on the inhibition of ice recrystallization. The mechanism of action of AFPs is based on the adsorption-inhibition theory, but the specific role of hydrogen and hydrophobic bonds/residues and structural characteristics is also detailed. Because of the properties of AFPs, they have been successfully used to preserve the quality of a wide variety of refrigerated and frozen foods. Among the limitations of the use of AFPs, the high cost of production stands out, but currently there are solutions such as the use the production of recombinant proteins, cloning and chemical synthesis. Although in vitro, in vivo and human studies have shown that AFPs are non-toxic, their safety remains a matter of debate. Further studies are recommended to expand knowledge about AFPs, to reduce costs in their large-scale production, to understand their interaction with other food compounds and their possible effects on the consumer.
ABSTRACT
Introducción: La nueva Ley Universitaria 30220 permite mejorar las condiciones básicas de calidad universitaria en Perú, y es pertinente conocer las condiciones del estudiante y su procedencia para la mejora continua de su progreso académico. Objetivo: Determinar las características sociodemográficas, económicas y de salud de beneficiarios de los servicios educacionales complementarios básicos de la Universidad Nacional de Frontera, Sullana Perú. Métodos: Se trata de un estudio descriptivo. Se revisaron los cuestionarios socioeconómicos, familiares y de salud de los beneficiarios. La población fue censal y ascendió a 1285 estudiantes. Resultados: Del total de estudiantes, 64 por ciento fueron mujeres y 35 por ciento hombres; asimismo, se determinó un elevado porcentaje de estudiantes con servicio de agua por horas, y se observó que algunos trabajaban en ocupaciones de ventas, en trabajo independiente y como mototaxistas. También se determinó que la mayoría de los estudiantes percibían un sueldo mensual entre 250-500 soles. En cuanto a la vacunación, se determinó que los estudiantes se colocaron la vacuna antitetánica, la vacuna contra el sarampión, la vacuna contra la hepatitis B, y la vacuna contra el virus del papiloma humano. Además, se halló un bajo porcentaje de estudiantes con asma, con algún tipo de alergia, y con padecimiento de alguna discapacidad, depresión y abuso sexual. Conclusiones: El servicio complementario de salud que brinda la universidad es pertinente para reducir riesgos de deserción por motivos de salud durante el pregrado. Aunque se necesita articular esfuerzos con los Gobiernos locales para establecer programas de salud(AU)
Introduction: The new University Law 30220 allows improving the basic conditions of university quality in Peru, insofar it is pertinent to know students' conditions and origins in view of the continuous improvement of their academic progress. Objective: To determine the sociodemographic, economic and health-related characteristics of beneficiaries of basic complementary educational services of the National University of Frontera in Sullana, Peru. Methods: This is a descriptive study. The socioeconomic, family and health questionnaires of the beneficiaries were reviewed. The population was of census type and amounted to 1,285 students. Results: Of the total of students, 64 percent were women and 35 percent were men. Likewise, a high percentage of students with hourly water service was determined, as well as some were observed to work in sales occupations, self-employment and as motorcycle taxi drivers. Most of the students were observed to receive a monthly salary between 250-500 soles. Regarding vaccination, the students were observed to receive vaccines against tetanus, measles, hepatitis B and human papillomavirus vaccines. In addition, a low percentage of students with asthma, with some type of allergy or suffering from some disability, depression and sexual abuse was found. Conclusions: The complementary health service offered by the university is pertinent to reduce the risk of dropping out due to health-related reasons during undergraduate studies. Although it is necessary to coordinate efforts with local governments for establish health programs(AU)
