Improving and measuring the solubility of favipiravir and montelukast in SC-CO2 with ethanol projecting their nanonization.

Supercritical carbon dioxide (SC-CO2)-based approaches have become more popular in recent years as alternative methods for creating micro- or nanosized medicines. Particularly, high drug solubility is required in those techniques using SC-CO2 as a solvent. During the most recent pandemic years, favipiravir and montelukast were two of the most often prescribed medications for the treatment of COVID-19. In this study, ethanol at 1 and 3 mol% was utilized as a cosolvent to increase the solubility of both medicines in SC-CO2 by a static approach using a range of temperatures (308 to 338 K) and pressure (12 to 30 MPa) values. The experimentally determined solubilities of favipiravir and montelukast in SC-CO2 + 3 mol% ethanol showed solubility values up to 33.3 and 24.5 times higher than that obtained for these drugs with only SC-CO2. The highest values were achieved in the pressure of 12 MPa and temperature of 338 K. Last but not least, six density-based semi-empirical models with various adjustable parameters were used to perform the modeling of the solubility of favipiravir and montelukast.

Solubility measurement of verapamil for the preparation of developed nanomedicines using supercritical fluid.

A static method is employed to determine the solubilities of verapamil in supercritical carbon dioxide (SC-CO2) at temperatures between 308 and 338 K and pressures between 12 and 30 MPa. The solubility of verapamil in SC-CO2 expressed as mole fraction are in the range of 3.6 × 10-6 to 7.14 × 10-5. Using four semi-empirical density-based models, the solubility data are correlated: Chrastil, Bartle, Kumar-Johnston (K-J), and Mendez-Santiago and Teja (MST), two equations of state (SRK and PC-SAFT EoS), expanded liquid models (modified Wilson's models), and regular solution model. The obtained results indicated that the regular solution and PC-SAFT models showed the most noteworthy exactness with AARD% of 1.68 and 7.45, respectively. The total heat, vaporization heat, and solvation heat of verapamil are calculated at 39.62, 60.03, and - 20.41 kJ/mol, respectively. Regarding the poor solubility of verapamil in SC-CO2, supercritical anti-solvent methods can be an appropriate choice to produce fine particles of this drug.

Experimental and modeling of solubility of sitagliptin phosphate, in supercritical carbon dioxide: proposing a new association model.

The solubility of an anti-hyperglycemic agent drug, (R)-4-oxo-4-[3-(trifluoromethyl)-5,6-dihydro [1,2,4] triazolo[4,3-a] pyrazin-7(8H)-yl]-1-(2,4,5-trifluorophenyl) butan-2-amine (also known as Sitagliptin phosphate) in supercritical carbon dioxide (scCO2) was determined by ananalytical and dynamic technique at different temperatures (308, 318, 328 and 338 K) and pressure (12-30 MPa) values. The measured solubilities were in the range of 3.02 × 10-5 to 5.17 × 10-5, 2.71 × 10-5 to 5.83 × 10-5, 2.39 × 10-5 to 6.51 × 10-5 and 2.07 × 10-5 to 6.98 × 10-5 in mole fraction at (308, 318, 328 and 338) K, respectively. The solubility data were correlated with existing density models and with a new association model.

Association between symptoms of COVID-19 infection and adverse maternal-perinatal outcomes in pregnant women at a referral hospital. / Asociación entre los síntomas de la infección por la COVID-19 y los resultados materno-perinatales adversos en gestantes de un hospital de referencia.

OBJECTIVES.: To determine the association between symptoms of COVID-19 infection and adverse maternal-perinatal outcomes in pregnant women from a referral hospital. MATERIALS AND METHODS.: Analytical cross-sectional study of women in the third trimester of pregnancy hospitalized due to COVID-19 in the gynecology and obstetrics area of a general hospital in Lima during 2020. Clinical and obstetric variables were collected. Fisher's exact test and Chi-square test were used during the descriptive analysis. Poisson regression was used to find the association between the variables of interest, with a 95% confidence interval (95%CI). RESULTS.: A total of 272 pregnant women were included, 50.3% of whom had symptoms of infection. Of these, 35.7% of the pregnant women and 16.5% of the newborns had an adverse outcome. Having symptoms of COVID-19 infection increased the risk of maternal complications as a whole (PR= 2.32 95%CI: 1.61-3.34), premature rupture of membranes (PR= 2.73 95%CI: 1.51-4.94) and preeclampsia (PR= 2.73 95%CI: 1.51-4.94). Similarly, symptoms of COVID-19 infection increased the risk of perinatal complications as a whole (PR= 2.51 95%CI: 1.34-4.68) and acute fetal distress (PR= 2.99 95%CI: 1.07-8.38). CONCLUSIONS.: The presence of symptoms of COVID-19 infection increase the risk of adverse maternal-perinatal outcomes.

OBJETIVOS.: Determinar la asociación entre los síntomas de la infección por la COVID-19 y los resultados materno-perinatales adversos en gestantes de un hospital de referencia. MATERIALES Y MÉTODOS.: Estudio transversal analítico en gestantes en el tercer trimestre, hospitalizadas por la COVID-19 en el área de ginecología y obstetricia de un hospital general de Lima, en el 2020. Se recogieron variables clínicas y obstétricas. Para el análisis descriptivo se empleó la prueba exacta de Fisher y Chi Cuadrado, y para hallar la asociación entre las variables de interés se usó la regresión de Poisson, con un intervalo de confianza al 95% (IC95%). RESULTADOS.: Se incluyeron a 272 gestantes, de ellas el 50,3% tuvieron síntomas de infección. El 35,7% de las gestantes y el 16,5% de los recién nacidos tuvieron un resultado adverso. Tener síntomas de la infección por la COVID-19 aumentó el riesgo de complicaciones maternas en su conjunto (RP= 2,32 IC95%: 1,61-3,34), de ruptura prematura de membranas (RP= 2,73 IC95%: 1,51-4,94) y de preeclampsia (RP= 2,73 IC95%: 1,51-4,94). De igual forma, aumentó el riesgo de complicaciones perinatales en su conjunto (RP= 2,51 IC95%: 1,34-4,68) y de sufrimiento fetal agudo (RP= 2,99 IC95%: 1,07-8,38). CONCLUSIONES.: Los síntomas de la infección por la COVID-19 aumentan el riesgo de resultados materno-perinatales adversos.

Processing, Characterization and Disintegration Properties of Biopolymers Based on Mater-Bi® and Ellagic Acid/Chitosan Coating.

Among the most promising synthetic biopolymers to replace conventional plastics in numerous applications is MaterBi® (MB), a commercial biodegradable polymer based on modified starch and synthetic polymers. Actually, MB has important commercial applications as it shows interesting mechanical properties, thermal stability, processability and biodegradability. On the other hand, research has also focused on the incorporation of natural, efficient and low-cost active compounds into various materials with the aim of incorporating antimicrobial and/or antioxidant capacities into matrix polymers to extend the shelf life of foods. Among these is ellagic acid (EA), a polyphenolic compound abundant in some fruits, nuts and seeds, but also in agroforestry and industrial residues, which seems to be a promising biomolecule with interesting biological activities, including antioxidant activity, antibacterial activity and UV-barrier properties. The objective of this research is to develop a film based on commercial biopolymer Mater-Bi® (MB) EF51L, incorporating active coating from chitosan with a natural active compound (EA) at two concentrations (2.5 and 5 wt.%). The formulations obtained complete characterization and were carried out in order to evaluate whether the incorporation of the coating significantly affects thermal, mechanical, structural, water-vapor barrier and disintegration properties. From the results, FTIR analysis yielded identification, through characteristic peaks, that the type of MB used is constituted by three polymers, namely PLA, TPS and PBAT. With respect to the mechanical properties, the values of tensile modulus and tensile strength of the MB-CHI film were between 15 and 23% lower than the values obtained for the MB film. The addition of 2.5 wt.% EA to the CHI layer did not generate changes in the mechanical properties of the system, whereas a 5 wt.% increase in ellagic acid improved the mechanical properties of the CHI film through the addition of natural phenolic compounds at high concentrations. Finally, the disintegration process was mainly affected by the PBAT biopolymer, causing the material to not disintegrate within the times indicated by ISO 20200.

Developing Core/Shell Capsules Based on Hydroxypropyl Methylcellulose and Gelatin through Electrodynamic Atomization for Betalain Encapsulation.

Betalains are bioactive compounds with remarkable functional and nutritional activities for health and food preservation and attractiveness. Nevertheless, they are highly sensitive to external factors, such as oxygen presence, light, and high temperatures. Therefore, the search for new structures, polymeric matrices, and efficient methods of encapsulation of these compounds is of great interest to increase their addition to food products. In this work, betalains were extracted from red beetroot. Betacyanin and betaxanthin contents were quantified. Subsequently, these compounds were successfully encapsulated into the core of coaxial electrosprayed capsules composed of hydroxypropyl methylcellulose (HPMC) and gelatin (G). The effect of incorporating the carbohydrate and the protein both in the core or shell structures was studied to elucidate the best composition for betalain protection. Morphological, optical, and structural properties were analyzed to understand the effect of the incorporation of the bioactive compounds in the morphology, color, and chemical interactions between components of resulting electrosprayed capsules. The results of the thermogravimetric and encapsulation efficiency analysis coincided that the incorporation of beetroot extract in G in the core and HPMC in the shell resulted in the structure with greater betalain protection. The effectiveness of the core/shell structure was confirmed for future food applications.

Asociación entre los síntomas de la infección por la COVID-19 y los resultados materno-perinatales adversos en gestantes de un hospital de referencia / Association between symptoms of COVID-19 infection and adverse maternal-perinatal outcomes in pregnant women at a referral hospital

Objetivos. Determinar la asociación entre los síntomas de la infección por la COVID-19 y los resultados materno-perinatales adversos en gestantes de un hospital de referencia. Materiales y métodos. Estudio transversal analítico en gestantes en el tercer trimestre, hospitalizadas por la COVID-19 en el área de ginecología y obstetricia de un hospital general de Lima, en el 2020. Se recogieron variables clínicas y obstétricas. Para el análisis descriptivo se empleó la prueba exacta de Fisher y Chi Cuadrado, y para hallar la asociación entre las variables de interés se usó la regresión de Poisson, con un intervalo de confianza al 95% (IC95%). Resultados. Se incluyeron a 272 gestantes, de ellas el 50,3% tuvieron síntomas de infección. El 35,7% de las gestantes y el 16,5% de los recién nacidos tuvieron un resultado adverso. Tener síntomas de la infección por la COVID-19 aumentó el riesgo de complicaciones maternas en su conjunto (RP= 2,32 IC95%: 1,61-3,34), de ruptura prematura de membranas (RP= 2,73 IC95%: 1,51-4,94) y de preeclampsia (RP= 2,73 IC95%: 1,51-4,94). De igual forma, aumentó el riesgo de complicaciones perinatales en su conjunto (RP= 2,51 IC95%: 1,34-4,68) y de sufrimiento fetal agudo (RP= 2,99 IC95%: 1,07-8,38). Conclusiones. Los síntomas de la infección por la COVID-19 aumentan el riesgo de resultados materno-perinatales adversos.

Objectives. To determine the association between symptoms of COVID-19 infection and adverse maternal-perinatal outcomes in pregnant women from a referral hospital. Materials and methods. Analytical cross-sectional study of women in the third trimester of pregnancy hospitalized due to COVID-19 in the gynecology and obstetrics area of a general hospital in Lima during 2020. Clinical and obstetric variables were collected. Fisher's exact test and Chi-square test were used during the descriptive analysis. Poisson regression was used to find the association between the variables of interest, with a 95% confidence interval (95%CI). Results. A total of 272 pregnant women were included, 50.3% of whom had symptoms of infection. Of these, 35.7% of the pregnant women and 16.5% of the newborns had an adverse outcome. Having symptoms of COVID-19 infection increased the risk of maternal complications as a whole (PR= 2.32 95%CI: 1.61-3.34), premature rupture of membranes (PR= 2.73 95%CI: 1.51-4.94) and preeclampsia (PR= 2.73 95%CI: 1.51-4.94). Similarly, symptoms of COVID-19 infection increased the risk of perinatal complications as a whole (PR= 2.51 95%CI: 1.34-4.68) and acute fetal distress (PR= 2.99 95%CI: 1.07-8.38). Conclusions. The presence of symptoms of COVID-19 infection increase the risk of adverse maternal-perinatal outcomes.

Clinical Characteristics of Coronavirus Disease (COVID-19) in Mexican Children and Adolescents.

BACKGROUND: We analyzed the demographic, clinical, and diagnostic data of children and adolescents in Mexico, from the first case of coronavirus disease (COVID-19) to 28 February 2022. METHODS: Using the open databases of the Ministry of Health and a tertiary pediatric hospital, we obtained demographic and clinical data from the beginning of the COVID-19 pandemic until 28 February 2022. In addition, quantitative reverse-transcription polymerase chain reaction outputs were used to determine the viral load, and structural protein-based serology was performed to evaluate IgG antibody levels. RESULTS: Of the total 437,832 children and adolescents with COVID-19, 1187 died. Of these patients, 1349 were admitted to the Hospital Infantil de Mexico Federico Gómez, and 11 died. Obesity, asthma, and immunosuppression were the main comorbidities, and fever, cough, and headache were the main symptoms. In this population, many patients have a low viral load and IgG antibody levels. CONCLUSION: During the first 2 years of the COVID-19 pandemic in Mexico, children and adolescents had low incidence and mortality. They are a heterogeneous population, but many patients had comorbidities such as obesity, asthma, and immunosuppression; symptoms such as fever, cough, and headache; and low viral load and IgG antibodies.

Processing Compostable PLA/Organoclay Bionanocomposite Foams by Supercritical CO2 Foaming for Sustainable Food Packaging.

This article proposes a foaming method using supercritical carbon dioxide (scCO2) to obtain compostable bionanocomposite foams based on PLA and organoclay (C30B) where this bionanocomposite was fabricated by a previous hot melt extrusion step. Neat PLA films and PLA/C30B films (1, 2, and 3 wt.%) were obtained by using a melt extrusion process followed by a film forming process obtaining films with thicknesses between 500 and 600 µm. Films were further processed into foams in a high-pressure cell with scCO2 under constant conditions of pressure (25 MPa) and temperature (130 °C) for 30 min. Bionanocomposite PLA foams evidenced a closed cell and uniform cell structure; however, neat PLA presented a poor cell structure and thick cell walls. The thermal stability was significantly enhanced in the bionanocomposite foam samples by the good dispersion of nanoclays due to scCO2, as demonstrated by X-ray diffraction analysis. The bionanocomposite foams showed improved overall mechanical performance due to well-dispersed nanoclays promoting increased interfacial adhesion with the polymeric matrix. The water uptake behavior of bionanocomposite foams showed that they practically did not absorb water during the first week of immersion in water. Finally, PLA foams were disintegrated under standard composting conditions at higher rates than PLA films, showing their sustainable character. Thus, PLA bionanocomposite foams obtained by batch supercritical foaming seem to be a sustainable option to replace non-biodegradable expanded polystyrene, and they represent a promising alternative to be considered in applications such as food packaging and other products.

Active PLA Packaging Films: Effect of Processing and the Addition of Natural Antimicrobials and Antioxidants on Physical Properties, Release Kinetics, and Compostability.

The performance characteristics of polylactic acid (PLA) as an active food packaging film can be highly influenced by the incorporation of active agents (AAs) into PLA, and the type of processing technique. In this review, the effect of processing techniques and the addition of natural AAs on the properties related to PLA performance as a packaging material are summarized and described through a systematic analysis, giving new insights about the relation between processing techniques, types of AA, physical-mechanical properties, barriers, optical properties, compostability, controlled release, and functionalities in order to contribute to the progress made in designing antioxidant and antimicrobial PLA packaging films. The addition of AAs into PLA films affected their optical properties and influenced polymer chain reordering, modifying their thermal properties, functionality, and compostability in terms of the chemical nature of AAs. The mechanical and barrier performance of PLA was affected by the AA's dispersion degree and crystallinity changes resulting from specific processing techniques. In addition, hydrophobicity and AA concentration also modified the barrier properties of PLA. The release kinetics of AAs from PLA were tuned, modifying diffusion coefficient of the AAs in terms of the different physical properties of the films that resulted from specific processing techniques. Several developments based on the incorporation of antimicrobial and antioxidant substances into PLA have displayed outstanding activities for food protection against microbial growth and oxidation.

Obtaining Active Polylactide (PLA) and Polyhydroxybutyrate (PHB) Blends Based Bionanocomposites Modified with Graphene Oxide and Supercritical Carbon Dioxide (scCO2)-Assisted Cinnamaldehyde: Effect on Thermal-Mechanical, Disintegration and Mass Transport Properties.

Bionanocomposites based on Polylactide (PLA) and Polyhydroxybutyrate (PHB) blends were successfully obtained through a combined extrusion and impregnation process using supercritical CO2 (scCO2). Graphene oxide (GO) and cinnamaldehyde (Ci) were incorporated into the blends as nano-reinforcement and an active compound, respectively, separately, and simultaneously. From the results, cinnamaldehyde quantification values varied between 5.7% and 6.1% (w/w). When GO and Ci were incorporated, elongation percentage increased up to 16%, and, therefore, the mechanical properties were improved, with respect to neat PLA. The results indicated that the Ci diffusion through the blends and bionanocomposites was influenced by the nano-reinforcing incorporation. The disintegration capacity of the developed materials decreased with the incorporation of GO and PHB, up to 14 and 23 days of testing, respectively, without compromising the biodegradability characteristics of the final material.

Natural antimicrobials and antioxidants added to polylactic acid packaging films. Part I: Polymer processing techniques.

Currently, reducing packaging plastic waste and food losses are concerning topics in the food packaging industry. As an alternative for these challenges, antimicrobial and antioxidant materials have been developed by incorporating active agents (AAs) into biodegradable polymers to extend the food shelf life. In this context, developing biodegradable active materials based on polylactic acid (PLA) and natural compounds are a great alternative to maintain food safety and non-toxicity of the packaging. AAs, such as essential oils and polyphenols, have been added mainly as antimicrobial and antioxidant natural compounds in PLA packaging. In this review, current techniques used to develop active PLA packaging films were described in order to critically compare their feasibility, advantages, limitations, and relevant processing aspects. The analysis was focused on the processing conditions, such as operation variables and stages, and factors related to the AAs, such as their concentrations, weight losses during processing, and incorporation technique, among others. Recent developments of active PLA-based monolayers and bi- or multilayer films were also considered. In addition, patents on inventions and technologies on active PLA-based films for food packaging were reviewed. This review highlights that the selection of the processing technique and conditions to obtain active PLA depends on the type of the AA regarding its volatility, solubility, and thermosensitivity.

Designing Biodegradable and Active Multilayer System by Assembling an Electrospun Polycaprolactone Mat Containing Quercetin and Nanocellulose between Polylactic Acid Films.

The design of multilayer systems is an innovative strategy to improve physical properties of biodegradable polymers and introduce functionality to the materials through the incorporation of an active compound into some of these layers. In this work, a trilayer film based on a sandwich of electrospun polycaprolactone (PCL) fibers (PCLé) containing quercetin (Q) and cellulose nanocrystals (CNC) between extruded polylactic acid (PLA) films was designed with the purpose of improving thermal and barrier properties and affording antioxidant activity to packaged foods. PCLé was successfully electrospun onto 70 µm-thick extruded PLA film followed by the assembling of a third 25 µm-thick commercial PLA film through hot pressing. Optical, morphological, thermal, and barrier properties were evaluated in order to study the effect of PCL layer and the addition of Q and CNC. Bilayer systems obtained after the electrospinning process of PCL onto PLA film were also evaluated. The release of quercetin from bi- and trilayer films to food simulants was also analyzed. Results evidenced that thermal treatment during thermo-compression melted PCL polymer and resulted in trilayer systems with barrier properties similar to single PLA film. Quercetin release from bi- and trilayer films followed a similar profile, but achieved highest value through the addition of CNC.

Designing active mats based on cellulose acetate/polycaprolactone core/shell structures with different release kinetics.

Core/shell electrospun mats based on cellulose acetate (CA) and polycaprolactone (PCL) were developed as novel active materials for releasing quercetin (Quer) and curcumin (Cur). The effect of polymeric uniaxial and coaxial electrospun systems and the chemical structures of Quer and Cur on the structural, thermal, and mass transfer properties of the developed mats were investigated. Release modelling indicated that the diffusion of the active agents from the uniaxial PCL fibers was highly dependent on the type of food simulant. Higher diffusion coefficients were obtained for both active agents in acid food simulant due to the higher swelling of the electrospun mats. In addition, CA/PCL coaxial structures slowed down the diffusion of both active agents into both food simulants. CA increased the retention of the active compounds in the polymer structure, resulting in partition coefficients values higher than the values obtained for uniaxial active PCL mats.

Dolor neuropático en pacientes diabéticos insulinodependientes / Neuropathic pain in insulin-dependent diabetic patients

Resumen: Introducción: El dolor neuropático es complejo y, a pesar de los avances farmacológicos y no farmacológicos de los últimos años, es la principal causa de sufrimiento en pacientes diabéticos insulinodependientes. Objetivo: Realizar una revisión no sistemática de la literatura sobre el dolor neuropático en el paciente diabético insulinodependiente. Material y métodos: Se realizó una búsqueda bibliográfica de la literatura, el día 03 de agosto de 2019, en las bases de datos PubMed, de la Biblioteca Médica Nacional de los Estados Unidos (NLM), con los siguientes descriptores en idioma inglés: diabetes mellitus insulinodependiente AND neuropatic pain, lo cual ofreció un total de 133 publicaciones. Cuando se activó el filtro en humanos se mantuvieron 11 artículos. Con el filtro en los últimos cinco años, a texto completo, permaneció uno cuyo título no está relacionado con el proyecto propuesto. Conclusiones: El paciente diabético insulinodependiente, en sentido general, presenta dolor neuropático de intensidad variable, que afecta su calidad de vida y que requiere tratamiento especializado.

Abstract: Introduction: Neuropathic pain is complex and despite the pharmacological and non-pharmacological advances of recent years, it is the main cause of suffering in insulin-dependent diabetic patients. Objective: To update a non-systematic review of the literature on neuropathic pain in the insulin-dependent diabetic patient. Material and methods: A literature search was conducted on August 3 of 2019 in the PubMed databases of the National Medical Library of the United States (NLM), with the following English-language descriptors: insulin-dependent diabetes mellitus AND neuropathic pain, which offered a total of 133 publications. When the filter was activated in humans, 11 articles were maintained. With the filter in the last five years, full text remained one whose title is not related to the proposed project. Conclusions: The general insulin-dependent diabetic patient presents with neuropathic pain of varying intensity, which affects their quality of life and requires specialized treatment.

Effect of supercritical incorporation of cinnamaldehyde on physical-chemical properties, disintegration and toxicity studies of PLA/lignin nanocomposites.

Poly (lactic acid)/lignin nanocomposites (PLA/Lig-Np) containing cinnamaldehyde (Ci) were obtained by a combination of melt extrusion and supercritical impregnation process. In this work, Ci impregnation tests were carried out in a high-pressure cell at 40 °C for 3 h using 12 MPa and 1 MPa min-1 of depressurization rate, obtaining impregnation yields ranging from 5.7 to 10.8% w/w. Thermal, mechanical and colorimetric properties of the developed films were affected by the incorporation of lignin nanoparticles and the active compound, obtaining biodegradable plastic materials with a strong UV-light barrier property compared to PLA films. In addition, disintegrability tests under composting conditions confirmed the biodegradable character of nanocomposites developed. On day 23, a disintegration percentage greater than 90% was determined for all bionanocomposites. Finally, to establish the possible toxicity effect of the nanocomposites obtained, studies in vivo were performed in normal rats. Toxicity studies showed normal blood parameters after a single dose of nanocomposites. PLA/Ci/Lig-Np bionanocomposite films could be potentially applied to design biodegradable UV-light barrier materials for food packaging and biomedical applications.

The use of nanoadditives within recycled polymers for food packaging: Properties, recyclability, and safety.

Nanotechnology is considered a highly valued technology to reduce the current environmental problem that is derived from plastic accumulation. The need to recycle and reuse packaging materials is essential to create a sustainable society towards a circular economy. However, the reprocessing of polymers leads to the deterioration of their characteristic mechanical, optical, thermal, and barrier properties due to the degradation of their polymeric chains. When recycled polymers are reinforced with nanoadditives, aforementioned properties improve and their use in the circular economy is more viable. In this review, different types of nanoadditives and recent advances in the development of recycled polymer nanocomposites reinforced with nanoadditives will be presented. In addition, there is a description of two research topics of current interest, recyclability of nanocomposites and safety for food packaging applications. Recyclability of nanocomposites requires a study that includes the nature of the polymer matrix, the type of polymer and the concentration of nanofiller, the morphology, the presence of additives, and the conditions of the thermal-mechanical cycles. Finally, safety section is dedicated to clarify the migration process in nanoreinforced-recycled polymers in order to assess their safety for food contact applications.

Ozonoterapia sistémica en pacientes diabéticos insulinodependientes con dolor neuropático / Systemic ozone therapy in insulin-dependent diabetic patients with neuropathic pain

Introducción: Con frecuencia, los pacientes diabéticos presentan dolor neuropático como complicación de su enfermedad. Objetivo: Identificar las ventajas de la ozonoterapia sistémica en pacientes diabéticos insulinodependientes con dolor neuropático. Métodos: Se realizó un estudio descriptivo en diabéticos insulinodependientes con dolor neuropático que acudieron a la Clínica del Dolor del Hospital Clínico Quirúrgico Hermanos Ameijeiras entre febrero de 2014 hasta enero de 2019. A todos se les cuantificó el dolor, la presencia de parestesias, la fuerza muscular, el reflejo aquiliano y la hemoglobina glicosilada. Se administraron 15 sesiones de ozono vía rectal y 6 de autohemoterapia mayor. Se compararon los resultados de la primera sesión y en la última (8 semanas de tratamiento). Resultados: El 45,3 por ciento tenían 60 años o más, 59 por ciento eran del sexo femenino y 89,3 por ciento tenían 15 o más años de evolución de la diabetes. En la primera consulta la intensidad del dolor en 100 por ciento osciló entre 7 y 10 de la escala numérica verbal y todos presentaron parestesias. En 59,3 por ciento existió disminución de la fuerza muscular, 62 por ciento presentó reflejo aquiliano disminuido y 88 por ciento hemoglobina glicosilada mayor o igual a 12 por ciento. Estos síntomas mejoraron a las ocho semanas. Conclusiones: Las probadas propiedades analgésicas y antiinflamatorias del ozono lo convierten en la actualidad en una herramienta terapéuticas de las más eficientes para el control del dolor crónico en pacientes diabéticos insulinodependientes(AU)

Introduction: Frequently, diabetic patients present neuropathic pain as a complication of their disease. Objective: To identify the advantages of systemic ozone therapy for insulin-dependent diabetic patients with neuropathic pain. Methods: A descriptive study was carried out with insulin-dependent diabetic patients with neuropathic pain who attended the Pain Clinic of Hermanos Ameijeiras Clinical-Surgical Hospital between February 2014 until January 2019. All of them were quantified pain, the presence of paresthesias, muscle strength, ankle jerk reflex, and glycosylated hemoglobin. The patients received fifteen sessions of rectal ozone and six sessions of major self-hemotherapy. We compared the outcomes after the first session and after the last one (eight weeks). Results: 45.3 percent were 60 years or older, 59 percent were female, and 89.3 percent had a natural history of diabetes of 15 years or more. In the first hospital visit, the intensity of 100 percent pain ranged between 7 and 10 according to the verbal numeric scale, and all presented paresthesias. In 59.3 percent, there was a decrease in muscle strength, 62 percent had decreased ankle jerk reflex, and 88 percent had glycosylated hemoglobin higher than or equal to 12 percent. These symptoms improved at week eight. Conclusions: The proven analgesic and anti-inflammatory properties of ozone make it currently a therapeutic tool among the most efficient for controlling chronic pain in insulin-dependent diabetic patients(AU)

Supercritical impregnation for food applications: a review of the effect of the operational variables on the active compound loading.

The scCO2-assisted impregnation process has arisen as an effective method to impregnate solid materials. Its multiple advantages include high diffusion, it allows to obtain free-solvent materials and to operate under low temperatures, which permits to process thermolabile solutes. These characteristics have allowed its application at industrial scale for the impregnation of wood with fungicides and in the last years for textile dyeing. Meanwhile, other numerous applications are still being studied at laboratory scale. One potential field of application corresponds to the food-related industry, which includes the use of scCO2-assisted impregnation process to develop active materials for food packaging and to generate food-grade materials loaded with nutraceuticals for functional food applications. In this framework, this article summarizes the advantages and the main drawbacks with the scCO2-assisted impregnation process. The effect of the processing variables of the scCO2-assisted impregnation process is discussed in terms of the incorporation of active compounds within polymer structures. Including the principles and description of the process and a review of the investigated systems for a better understanding.

Development of Bilayer Biodegradable Composites Containing Cellulose Nanocrystals with Antioxidant Properties.

The interest in the development of novel biodegradable composites has increased over last years, and multilayer composites allow the design of materials with functionality and improved properties. In this work, bilayer structures based on a coated zein layer containing quercetin and cellulose nanocrystals (CNC) over an extruded poly(lactic acid) (PLA) layer were developed and characterized. Bilayer composites were successfully obtained and presented a total thickness of approx. 90 µm. The coated zein layer and quercetin gave a yellowish tone to the composites. The incorporation of the zein layer containing CNC decreased the volatile release rate during thermal degradation. Regarding to mechanical properties, bilayer composites presented lower brittleness and greater ductility evidenced by a lower Young's modulus and higher elongation values. Water permeability values of bilayer composites greatly increased with humidity and the zein coated layer containing quercetin increased this effect. Experimental data of quercetin release kinetics from bilayer structures indicated a higher release for an alcoholic food system, and the incorporation of cellulose nanocrystals did not influence the quercetin diffusion process.