Risultati della ricerca - (( (Temperaturas OR temperature) decrease ) OR ( temperatura decrease ))*
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8861
Efectos de la pesquería del pulpo sobre la población de la cacerolita de mar en la Reserva de la Biosfera Ría Lagartos, México
Pubblicato in Ciencias Marinas (2020)Fuente: Ciencias MarinasTipo de material: Artículo científicoDescripción: The American horseshoe crab, Limulus polyphemus, has been reported to be illegally caught for use as Octopus spp. bait in some localities of the Yucatán Peninsula, Mexico. To learn if the octopus fishery could be negatively influencing the limulus populations in the area, L. polyphemus individuals were sampled twice a year, before and after the annual octopus fishing season, over 4 consecutive years (2015–2018) in Río Lagartos and San Felipe, both in the Ría Lagartos Biosphere Reserve (RLBR), Yucatán. Quadrants were drawn perpendicular to the mangrove edge, physicochemical parameters in the water (depth, temperature, dissolved oxygen, pH, salinity, and electrical conductivity) were determined, and granulometry of marine sediments was measured (Folk technique). The number of live specimens, number of females, and average length were recorded. No significant differences were found for the physicochemical properties of water or the recorded sedimentology (P > 0.05). Samplings revealed a low number of organisms per site: 22 in Río Lagartos and 24 in San Felipe, both from data before the start of the 2017 octopus fishing season. In the samplings after the start of the 2018 octopus fishing season, only 2 organisms were observed in Río Lagartos and none in San Felipe. The results showed a significant decrease in the number of live L. polyphemus specimens after the beginning of the octopus fishing season and a decrease in the average length of organisms, suggesting a negative effect of mollusk fishing activities on the horseshoe crab populations. More studies are required that integrate other physicochemical, biological, and socioeconomic factors to elucidate the potential threat of this fishery on L. polyphemus populations in the RLBR. Se ha documentado que la cacerolita de mar Limulus polyphemus se captura de forma ilegal para uso como carnada de Octopus spp. en algunas localidades de la península de Yucatán, México. Para conocer si la pesquería de pulpo pudiese tener una influencia negativa en las poblaciones de este límulo, se muestrearon organismos de L. polyphemus 2 veces al año, antes y después del comienzo de la temporada anual de pulpo, durante 4 años consecutivos (2015–2018) en Río Lagartos y San Felipe, situados en la Reserva de la Biosfera Ría Lagartos (RBRL), Yucatán. Se trazaron cuadrantes perpendiculares a la vera del manglar y se midieron los parámetros fisicoquímicos del agua (profundidad, temperatura, oxígeno disuelto, pH, salinidad y conductividad eléctrica), así como la granulometría del sedimento marino (mediante el tamizado de Folk). Se registró el número de individuos vivos, el número de hembras y la longitud promedio. No se encontraron diferencias significativas en los parámetros fisicoquímicos del agua ni en la sedimentología registrada (P > 0.05). Los muestreos evidenciaron pocos organismos por sitio estudiado: 22 en Río Lagartos y 24 en San Felipe, ambos resultados antes de iniciada la temporada de pulpo de 2017. En los muestreos posteriores al inicio de la temporada de pulpo de 2018, solo se observaron 2 organismos en Río Lagartos y ninguno en San Felipe. Los resultados evidenciaron una disminución significativa en el número de ejemplares vivos de L. polyphemus después de iniciada la temporada de pulpo, así como también una disminución en la longitud promedio de los organismos, lo que sugiere un efecto negativo en las poblaciones de la cacerolita de mar derivado de las actividades propias de la pesca del molusco. Se requieren más estudios que integren otros factores fisicoquímicos, biológicos y socioeconómicos para dilucidar la potencial amenaza de esta pesquería sobre las poblaciones de este límulo en la RBRL.Acceso al recurso -
8862
Modification of banana starch (Musa paradisiaca L.) with polyethylene terephthalate: Virgin and bottle waste
Pubblicazione 2021Fuente: Universidad del PapaloapanTipo de material: ArtículoDescripción: Chemical modification of banana starch (Musa paradisiaca L.) with the degradation products of virgin and bottle waste of polyethylene terephthalate was carried out in situ. The modified starch was characterized by FTIR and NMR, which allowed proposing three chemical structures. SEM micrographs showed that the morphology of the modified starch granule is directly related with mass ratio of Starch/PET and type of PET used in the reaction. The crystallinity of the modified starch decreased up to 92.6% and 62.5% using bottle waste and virgin PET, respectively, according to XRD diffractograms. TGA analysis showed that the starch degradation temperature decreased by 12 °C. Modified starch films were elaborate and its electrical conductivity was found to be 2.9 times compared to that of native starch. The starch/PET film presented the highest value in the mechanical property of elongation at break compared to the starch-only film. The modified starch film was degraded above 80% by aqueous hydrolysis.Acceso al recurso -
8863
Effect of Crushed Glass Cullet Sizes on Physical and Mechanical Properties of Red Clay Bricks
Pubblicazione 2016Fuente: Universidad del PapaloapanTipo de material: ArtículoDescripción: This study reports the effect of clear waste glass from bottles added on 20 to 30 wt.% and variable particle size (<500, <300, and<212 𝜇m), into clay mixtures for the handmade brick manufacturing process. The bricks were manufactured with mixtures of clay,crushed glass, and water in different proportions, homogenized, casted in wooden molds, air-dried at room temperature for 72 h,and sintered at 1000∘C for 12 h. Total shrinkage, water absorption, compressive strength, microstructure, and phase composition arediscussed with respect to glass content and its particle size. The results indicate that increasing the content of glass and decreasing itsparticle size enhanced significantly the brick properties of water absorption and compressive strength by up to 18.5% and 6.8 MPa,for bricks with 30 wt% and particle size lower than 212 𝜇m. It is proposed that decreasing the glass particle size its surface areaincreases allowing easier melting of glass by lower energy consumption, reducing porosity and enhancing brick propertiesAcceso al recurso -
8864
Clusters of starch-g-PCL and their effect on the physicochemical properties of films
Pubblicazione 2017Fuente: Universidad del PapaloapanTipo de material: ArtículoDescripción: Starch-g-PCL films were prepared using the casting method and were characterized by different instrumental techniques and physicochemical properties. Nuclear magnetic resonance and Fourier transform infrared spectroscopy led to the proposal of a chemical structure for the films. The scanning electron microscopy (SEM) images of the films showed the formation of clusters of the graft copolymer starch-g-PCL. The effects of these clusters on the crystallinity (X-ray powder diffraction) revealed that the crystalline zones of the films increased by 46% and the elongation percentage increased by up to 50%. Also, the chemical degradation (aqueous hydrolysis) and the soil degradation of these films were 1.9 and 2.6 times faster than the films of starch alone. However, the thermal degradation temperature of the films decreased by more than 15°C, the moisture content decreased to 6.5%, and the water vapor permeation values increased in the films that contained starch-g-PCL. These results were accentuated with the increase in the amount of starch-g-PCL clusters.Acceso al recurso -
8865
Lintnerization of banana starch isolated from underutilized variety: morphological, thermal, functional properties, and digestibility
Pubblicazione 2014Fuente: Universidad del PapaloapanTipo de material: ArtículoDescripción: The effect of lintnerization on the banana starch of the Roatán cultivar from acid hydrolysis at 3, 5, and 7 days on the starch digestibility and morphological and thermal features was evaluated. Acid treatment produced an increase in the rapidly digestible starch (RDS) (20.2%) and slowly digestible starch (29.7%), but a decrease in the resistant starch (36.3%) content, as compared with its native counterpart. However, over the longest acid-treatment time, a decrease in the RDS over 5 days was observed. The lintnerized banana starch can be used in food products without additional cooking. The temperature (77–80°C) and enthalpy (11.6–14.1 J/g) of gelatinization increased significantly when the acid-treatment time increased, indicating an arrangement of the crystalline lamella by the double helices of the amylopectin chains. The acid treatment increased the retrogradation rate of the lintnerized banana starch gels. The lintnerization of banana starch for different lengths of time modified its morphology, starch digestibility, and thermal features, indicating changes in the crystalline lamella due to the arrangement of the double helices of amylopectin.Acceso al recurso -
8866
Producción masiva de Tetraselmis suecica (Kylin) Butch. (Prasinophyceae), bajo diferentes concentraciones de nutrientes y ediciones de dióxido de carbono
Pubblicato in Ciencias Marinas (1991)Fuente: Ciencias MarinasTipo de material: Artículo científicoDescripción: A series of four experiments with Tetraselmis suecica was carried out under laboratory conditions in order to learn the production yield in volumes of 1,000 litres, with salinity of 28‰, with absence and addition of buffer and carbon dioxide, air flow of 25 I/min and average time of addition of carbon dioxide of two and a half minutes, at a pressure of 50 kg/cm2 to keep the pH equal to or below 7.5. A maximum density of 508,000 cells/ml was obtained with a ratio of 150/10 g/l of NaN03/NaH2P04, with an average constant of growth of 0.35 and 0.50 doublings per day. With a quarter and with half of the nutrients without buffer, a higher constant of growth was recorded, although it did not differ significantly at 95% confidence in relation to the control experiment. Productivity per unit of culture volume of T. suecica showed that on using low concentrations of nutrients plus carbon dioxide, good population yields relative to the control are obtained. Productivity was not affected by temperature since it was kept constant at 19 + 1ºC, but it decreases when the supplement of carbon dioxide is insufficient to keep the pH between 7.2-7.5. En condiciones de laboratorio se efectuó una serie de cuatro experimentos con Tetraselmis suecica, para conocer el rendimiento de producción en volúmenes de 1,000 litros, con salinidad de 28‰, con ausencia y adición de amortiguador y dióxido de carbono, flujo de aire de 25 l/min y tiempo promedio de adición de dióxido de carbono de dos minutos y medio, a 50 kg/cm2 de presión para mantener el pH igual o menor de 7.5. La máxima densidad de 508,000 cel/ml se obtuvo con la relación de 150/10 g/l de NaNO3/NaH2P04, con una constante de crecimiento promedio de 0.35 y 0.50 duplicaciones por día. Con un cuarto y la mitad de nutrientes sin amortiguador, se registró una constante de crecimiento promedio mayor, aunque no difirió significativamente al 95% de confianza con respecto al experimento control. La productividad por unidad de volumen de cultivo de T. suecica mostró que al utilizar bajas concentraciones de nutrientes más dióxido de carbono, se obtienen buenos rendimientos poblacionales respecto al control. La productividad no fue afectada por temperatura ya que se mantuvo constante 19 + 1ºC, pero decrece si el suplemento de dióxido de carbono es insuficiente para mantener el pH entre 7.2-7.5.Acceso al recurso -
8867
Opto-Metallurgy and the Photonide Class: Architectural Foundations for Zero-Latency Photonic AI Inference
Pubblicazione 2026Fuente: ZenodoTipo de material: Recurso digitalAcceso al recurso -
8868
Vaginal microbiota in Pelibuey sheep treated with antimicrobials at the removal of intravaginal sponges impregnated with flurogestone acetate
Pubblicazione 2019Fuente: Universidad del PapaloapanTipo de material: ArtículoDescripción: The use of intravaginal sponges produces changes in the composition of the normal vaginal microbiota and provokes the presence of a putrid abnormal fluid at sponge withdrawal. The aim of this study was to compare the effectiveness of the application of three different antibiotics (enrofloxacin, oxytetracycline or nitrofurazone) administered at sponge withdrawal on the vaginal microbiota in ewes. Intravaginal sponges impregnated with fluorogestone were inserted in 40 Pelibuey ewes (Day 0), remaining in situ for 14 days. At sponge withdrawal ewes received: 1) enrofloxacin, 2) oxytetracycline, 3) nitrofurazone, or 4) no treatment (control). The vaginal pH and temperature were recorded, and samples from the vaginal fluid were collected at that moment and 56 h later (Day 16). Samples were incubated to determine the number of Colony Forming Units (CFU). The log CFU increased from Day 0 to Day 14 (P < 0.0001) and decreased on Day 16 (P < 0.0001). On Day 16, the number of CFU was greater in control ewes than in the other three groups (P < 0.0001 for all the comparisons), being enroflaxin the more effective one (vs Toxi: P = 0.019 and vs Tnitro: P = 0.039). We concluded that the growth of the vagina microbiota present the day in which ewes come into estrus provoked by the use of intravaginal sponges may be partially controlled by the application of antibiotics at sponge withdrawal. Enrofloxacin was the most effective antibiotic to decrease bacterial vaginal number.Acceso al recurso -
8869
Malanga starch modified by annealing: Partial characterization and application as wall material in the protection of hibiscus extract
Pubblicazione 2025Fuente: Universidad del PapaloapanTipo de material: ArtículoDescripción: The hibiscus extract was encapsulated in thermally modified malanga starch (annealing) with the objective of enhancing the protective capacity of the bioactive compounds. Annealing malanga starch was conducted in a 1:9 ratio (starch/water) at temperatures of 67 °C and 70 °C for a period of 48 h. The bioactive compounds and antioxidant activity of the hibiscus extracts were quantified. The physicochemical characterization of native malanga starch (NMS) and starches modified by annealing at 67 °C (SA-67) and 70 °C (SA-70) showed amylose increased by 11.86 %, 13.20 %, and 13.06 %, respectively. The peak temperature (Tp) showed values of 77.76 °C for NMS, 82.57 °C for SA-67, and 83.86 °C for SA-70. As the temperature modification increased, the values of humidity, water activity, and gelatinization enthalpy decreased in the starches. The modifications made by NMS annealing showed that the microcapsules obtained favored the total retention of anthocyanins, with values ranging from 37.93 % (NMS encapsulates) to 54.37 % (SA-70 microcapsules). SA-70 encapsulates exhibited better protective capacity for bioactive compounds than SA-67 ones across an 8-week storage period. Scanning electron microscopy revealed that the modification at 70 °C changes the shape of the starch granule, promoting changes on the surface structure of SA-67 and SA-70 encapsulates compared to NMS encapsulates. These physicochemical changes due to modification by annealing could influence NMS ability to retain anthocyanins when used as a wall material and the stability of microencapsulated bioactive compounds during storage.Acceso al recurso -
8870
Synthesis and characterization of the starch/silicone oil composite and elaboration of its films
Pubblicazione 2022Fuente: Universidad del PapaloapanTipo de material: ArtículoDescripción: Synthesis of the starch/silicone oil composite carried out and its structural characterization by FTIR, Raman and 29Si NMR allowed to identify functional groups of the composite. The synthesis conditions were a starch/silicone oil mass ratio of 2.0 and a temperature of 150 oC to obtain a yield of 84.63 %. SEM analysis showed that the starch granules were covered by silicone oil, this caused a decrease in the crystallinity of starch. Composite films have higher thermal stability compared to native starch. Mechanical properties and electrical conductivity of the starch/silicone oil composite film increase with respect to starch-only films. While the crystallinity of both films is similar. The results obtained in this work indicate that starch/silicone oil composites can be an alternative to make films with a potential use for the packaging industry.Acceso al recurso -
8871
Effect of high-energy mechanical milling on the physicochemical and rheological properties of chayotextle (Sechium edule Sw.) starch
Pubblicazione 2023Fuente: Universidad del PapaloapanTipo de material: ArtículoDescripción: This work evaluates the effect of high-energy mechanical milling time (7 levels, 20–80 min) on amylose content, crystallinity pattern, temperature and gelatinization enthalpy, morphology, and rheological properties of chayotextle (Sechium edule Sw.) starch. After 30 min of milling, granular structure was affected, and amylose values were the highest while crystallinity and gelatinization enthalpy decreased significantly. These changes allowed to obtain gels with viscoelastic properties where the elastic character (Ǵ) prevailed upon the viscous modulus (Ǵ́). Native starch showed Tan δ values of 0.6, increased significantly (0.9) after 30 min of milling due to the surge in linear chains (amylose) and loss of granular structure. Native and modified starches showed high dependence on cutting or shear speed, presenting a non-Newtonian behavior (reofluidizers). These results indicate that mechanical grinding is an alternative to obtain modified starches with applications in the food industry.Acceso al recurso -
8872
Evaluation of the combined effect of osmotic and Refractance Window drying on the drying kinetics, physical, and phytochemical properties of beet
Pubblicazione 2020Fuente: Universidad del PapaloapanTipo de material: ArtículoDescripción: The effect of osmotic dehydration (OD) with different sucrose concentrations and temperatures was studied in combination with drying by Refractance WindowTM (RW) in beet slices with thicknesses of 1 and 5 mm. The color, texture, total polyphenol content (TPC), total flavonoid content (TFC), and antioxidant capacity (AC) of the beet with OD, RW, and OD-RW combined drying were evaluated. The best results of water loss (WL) and solid gain (SG) with OD were obtained with 65% sucrose solution at 60 °C. OD partially reduced the water content of the slices, decreasing the drying time with RW at 85 °C. However, the retention of qualities such as color, texture, TPC, TFC, and AC in beet was obtained with combined drying by OD-RW at 60 °C under OD conditions of 65% sucrose at 45 °C. These conditions afforded a stable product retaining its physical and chemical properties.Acceso al recurso -
8873
Dinámica del carbono inorgánico disuelto en la región de las grandes islas del golfo de California: Influencia de las masas de agua
Pubblicato in Ciencias Marinas (2013)Fuente: Ciencias MarinasTipo de material: Artículo científicoDescripción: In the Midriff Islands region (MIR) of the Gulf of California (Mexico), tidal mixing plays a very important role in the distribution of chemical properties. Although the temporal variability of the water masses is linked to the ocean dynamics of this region, its importance has not been considered. This work estimates the effect of water mass dynamics on the spatial distribution and seasonal variation of dissolved inorganic carbon (DIC) in the region, with special emphasis on the Ballenas Channel, during winter 2002, spring 2003, and summer 2004. Gulf of California Water (GCW) was found throughout the area in the first 100 m. Below, Subtropical Subsurface Water (SSW) filled the Delfín, Salsipuedes, and Tiburón basins, while to the southeast it was found between 150 and 350 m. Pacific Intermediate Water did not cross the sills. SSW enriches the surface water of the MIR with DIC when it increases in volume and when mixed with GCW by tidal effects. This contribution decreases towards summertime, when SSW sinks and the volume of GCW increases. In winter, GCW had three water types associated with oceanographic mixing processes and in combination with the presence of SSW. There was a strong DIC vs temperature relationship, which can be applied to analyze the carbon dynamics in the MIR, both at the surface using satellite imagery and vertically to simulate physical processes. En la región de las grandes islas (RGI) del golfo de California la mezcla por mareas juega un papel muy importante en la distribución de propiedades disueltas. Aunque la variabilidad temporal de las masas de agua está ligada con la dinámica oceanográfica de la región, su importancia no ha sido considerada. En este trabajo se estima el efecto de la dinámica de las masas de agua sobre la distribución espacial y variación estacional del carbono inorgánico disuelto (CID) en la RGI, con especial énfasis en el canal de Ballenas, durante el invierno de 2002, la primavera de 2003 y el verano de 2004. El Agua del Golfo de California (AGC) se encontró en toda la superficie en los primeros 100 m de profundidad. Por debajo del AGC, el Agua Subsuperficial Subtropical (ASS) llenó las cuencas Delfín, Salsipuedes y Tiburón, mientras que en el sureste se encontró entre 150 y 350 m. El Agua Intermedia del Pacifico no atravesó los umbrales. Se encontró que el ASS enriquece de CID las aguas superficiales de la RGI cuando aumenta su volumen y cuando se mezcla con el AGC por efecto de las mareas. El aporte disminuye hacia el verano, cuando el ASS se hunde al mismo tiempo que el volumen de AGC aumenta. En invierno, el AGC presentó tres tipos de agua asociadas a los procesos de mezcla y en combinación con la presencia de ASS. Se encontró también que en la RGI la relación CID vs temperatura podría aplicarse en futuros estudios para analizar la dinámica del carbono en la RGI, tanto en la superficie mediante imágenes de satélite como en la vertical para simular procesos físicos.Acceso al recurso -
8874
Spray-drying of Escontria chiotilla fruit juice: effect of the process variables on yield and physicochemical properties
Pubblicazione 2024Fuente: Universidad del PapaloapanTipo de material: ArtículoDescripción: Escontria chiotilla (jiotilla) fruit pulp has a high content of sugars, vitamins, antioxidants, and betalains. However, jiotilla fruits exhibit high susceptibility to microbial attack and physicochemical degradation during storage. Spray-drying of jiotilla fruit juice rich in betalains was carried out using maltodextrin as a carrier material. The effects of inlet (140 and 160 °C) and outlet (80 and 90 °C) temperatures and maltodextrin levels (1 and 2 g·g juice solids⁻¹) on process yield and physicochemical properties of jiotilla powders were studied. Maltodextrin concentration significantly affected (p < 0.05) all evaluated responses, except a_w and °Hue values, whereas drying temperatures did not significantly affect any response. An increase in process yield and luminosity, along with a decrease in chroma values and betalain content, was observed as maltodextrin concentration increased. Physicochemically stable powders (a_w < 0.25), with a color tendency toward red (°Hue: 11–13°), intermediate cohesiveness, fair-to-good flowability, high solubility (92.16%), low hygroscopicity (16.28 g H₂O·100 g db⁻¹), and high contents of betacyanins (82.4–127.1 mg BC·100 g db⁻¹) and betaxanthins (174.7–275.3 mg BX·100 g db⁻¹) were obtained. Jiotilla powder could be applied in the development of food products, even outside the jiotilla fruit production season.Acceso al recurso -
8875
In search of cytotoxic selectivity on cancer cells with biogenically synthesized Ag/AgCl nanoparticles
Pubblicazione 2022Fuente: Universidad del PapaloapanTipo de material: ArtículoDescripción: Green synthesis may be a useful approach to achieve selective cytotoxicity of silver nanoparticles on cancer cells and healthy cells. In this study, the concomitant biosynthesis of silver (Ag)/silver chloride (AgCl) nanoparticles from pineapple peel extracts and their behavior on the breast cancer cell line MCF-7 is shown. Bioreactions were monitored at different temperatures. Fourier-transform infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy (UV–vis), thermogravimetric analysis (TGA), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM) techniques were used to characterize nanoparticle development. The breast cancer cell line MCF-7 was used as a test model to study the cytotoxic behavior of Ag/AgCl nanoparticles and, as a counterpart, the nanoparticles were also tested on mononuclear cells. Ag/AgCl nanoparticles with spherical and triangular morphology were obtained. The size of the nanoparticles (10–70 nm) and the size distribution depended on the reaction temperature. A dose close to 20 µg/mL of Ag/AgCl nanoparticles considerably decreased the cell viability of the MCF-7 line. The best cytotoxicity effects on cancer cells were obtained with nanoparticles at 60 and 80 °C where cell viability was reduced up to 80% at a concentration of 50 µg/mL. A significant preference was observed in the cytotoxic effect of Ag/AgCl nanoparticles against cancer cells in comparison to monocytes.Acceso al recurso -
8876
Dual modification of chayotextle starch: effect on physicochemical, functional, and structural properties
Pubblicazione 2023Fuente: Universidad del PapaloapanTipo de material: ArtículoDescripción: Chemically modified starches are widely used as food additives to improve the appearance and physicochemical and biological properties of foods. The aim of this work is to chemically modify chayotextle (Sechium edule) starch by hydroxypropylation-crosslinking, and evaluate the effects of degree of substitution (DS), swelling power (SP), solubility index (SI), pasting, thermal properties, and morphological and molecular characteristics. Polar-Tex (modified maize starch) is used as control. The modified chayotextle starches (CHSs) exhibit a white color and DS values between 0.34% and 1.19% hydroxypropyl, dependening on propylene oxide concentration-response. In addition, the SP and pasting properties are higher in modified CHS than in native CHS and Polar-Tex. The SI and temperature of gelatinization of modified starches decrease compared to native sample. The morphology of native and modified CHS granules is spherical and oval. Fourier transform infrared and nuclear magnetic resonance studies confirm the structural modifications of CHS by hydroxypropylation-crosslinking. Dual-modified CHS can be potentially used as an additive in the food industry.Acceso al recurso -
8877
Effects of formulation and process conditions on chemical composition, color parameters, and acceptability of extruded insect-rich snack
Pubblicazione 2021Fuente: Universidad del PapaloapanTipo de material: ArtículoDescripción: A ready-to-eat, protein-rich snack was developed using a blend of nixtamalized maize (Zea mays L.) flour and grasshopper (Sphenarium purpurascens Ch.) meal, and an evaluation of the effects of the formulation and extrusion processing on the chemical composition, color parameters, and acceptability of the extrudates was conducted. The increase in extrusion temperature (120–180ºC) decreased the moisture (8.14–5.91 g/100 g) and lipid content (2.20–1.95 g/100 g) and increased aroma (3.82–4.24), texture (1.61–4.82), flavor (2.67–4.52), and overall acceptability (2.88–4.67). The increase in the grasshopper meal proportion (0–40 g/100 g) decreased the carbohydrate content (89.45–65.39 g/100 g), and whiteness index (68.51–47.14) and increased the protein (5.33–22.51 g/100 g) and ash contents (1.67–7.88 g/100 g), color difference (30.98–52.30), and browning index (24.28–39.77). The acceptability of the snack was oriented toward extrudates that had a color with a high L* (Corr = 0.74), with yellow tones b* (Corr = 0.73), and a whiteness index (Corr = 0.72). Therefore, the best products were those obtained at 167.8°C, proportion of grasshopper meal = 8.11 g/100 g, and a feed moisture content of 18.81 and 21.19 g/100 g, respectively, with a protein content of 13.27 and 13.66 g/100 g.Acceso al recurso -
8878
Resistant starch from plantain (Macho Musa paradisiaca L.) and banana (Roatan Musa sapientum L.) varieties crosslinked with epichlorohydrin
Pubblicazione 2024Fuente: Universidad del PapaloapanTipo de material: ArtículoDescripción: Resistant starch from plantain (Macho Musa paradisiaca L.) and banana (Roatan Musa sapientum L.) varieties was chemically modified by crosslinking using epichlorohydrin (EPI). These modified starches were subjected to in vitro digestibility studies using the Englyst method to determine the content of rapidly digestible starch (RDS), slowly digestible starch (SDS) and resistant starch (RS). The thermal stability of these crosslinked starches was evaluated by gelatinization and retrogradation analyses, and their enthalpies were determined using differential scanning calorimetry (DSC). Additionally, their functional properties were evaluated. Chemical modification with EPI significantly increased the RS content in both starch varieties compared to that in native starch. The enthalpy and gelatinization temperature decreased in the EPI-modified starches of both varieties, indicating lower thermal stability during the gelatinization process compared to that of native starch. In general, both varieties of crosslinked plantain starch had lower viscosity (0.43 Pa*s) than did native starch (0.58 Pa*s). The results indicates that this starch crosslinked with EPI constitutes an alternative for use in food for people with health problems such as high cholesterol levels or postprandial insulin concentrations.Acceso al recurso -
8879
Effect of cross-linking on the physicochemical, functional and digestibility properties of starch from Macho (Musa paradisiaca L.) and Roatan (Musa sapientum L.) banana varieties
Pubblicazione 2015Fuente: Universidad del PapaloapanTipo de material: ArtículoDescripción: Starches from the Macho (Musa paradisiaca L.) and Roatan (Musa sapientum L.) banana varieties were chemically modified by sodium trimetaphosphate (STMP) cross-linking. Cross-linking affected the pasting properties of the modified starch, with more pronounced changes observed in the Macho variety than in the Roatan starch. In turn, this result indicated that the former starch source is more susceptible to STMP cross-linking. The swelling and solubility profiles exhibited an important decrease with cross-linking, which was caused by increased ordering of the internal granule structure induced by cross-linking modifications. The gelatinization temperature and enthalpy increased due to cross-linking, indicating an improvement in the starch granule stability. Englyst's in vitro digestibility studies of the modified starch were performed to estimate the content of rapidly digestible (RDS), slowly digestible (SDS) and resistant (RS) starch fractions. It was shown that STMP cross-linking increased the RS content of the two banana varieties. However, the SDS content increased only for the Macho variety. In general, the viscosity was lower for the modified starches than for their native counterparts. The results of the current work indicate that the chemical modification process via STMP cross-linking offers an interesting alternative for obtaining RS from banana starches.Acceso al recurso -
8880
SEC-ZEFFO COSMOLOGY: UNIFIED RESOLUTION OF DARK MATTER, DARK ENERGY, H₀ TENSION, AND BLACK HOLE INFORMATION PARADOX VIA GRAVITATIONAL POLARISATION*
Pubblicazione 2026Fuente: ZenodoTipo de material: Recurso digitalAcceso al recurso