There has been substantial interest in phytoestrogens, because of their potential effect in reducing cancer and heart disease risk. Measuring concentrations of phytoestrogens in urine is an alternative method for conducting epidemiological studies. Our objective was to evaluate the urinary excretion of phytoestrogens as biomarkers for dietary phytoestrogen intake in Mexican women. Participants were 100 healthy women from 25 to 80 years of age. A food frequency questionnaire (FFQ) and a 24 h recall were used to estimate habitual and recent intakes of isoflavones, lignans, flavonols, coumestrol, resveratrol, naringenin, and luteolin. Urinary concentrations were measured by liquid chromatography (HPLC) coupled to mass spectrometry (MS) using the electrospray ionization interface (ESI) and diode array detector (DAD) (HPLC-DAD-ESI-MS). Spearman correlation coefficients were used to evaluate associations between dietary intake and urine concentrations. The habitual consumption (FFQ) of total phytoestrogens was 37.56 mg/day. In urine, the higher compounds were naringenin (60.1 µg/L) and enterolactone (41.7 µg/L). Recent intakes (24 h recall) of isoflavones (r = 0.460, p < 0.001), lignans (r = 0.550, p < 0.0001), flavonoids (r = 0.240, p < 0.05), and total phytoestrogens (r = 0.410, p < 0.001) were correlated to their urinary levels. Total phytoestrogen intakes estimated by the FFQ showed higher correlations to urinary levels (r = 0.730, p < 0.0001). Urinary phytoestrogens may be useful as biomarkers of phytoestrogen intake, and as a tool for evaluating the relationship of intake and disease risk in Mexican women.

A method was developed to determine glyphosate, aminomethylphosphonic acid (AMPA), and glufosinate in soil. The worldwide use of this herbicide in agricultural activities, and its known negative effects on both the environment and health, have generated interest in the establishment of methodologies for its determination in several matrices at trace level. The development of analytical methods for the determination of glyphosate, AMPA, and glufosinate is challenging due to its present amphoteric properties, high solubility in water, low molecular weight, high affinity to the ions presents in the soil, and lack of chromophore groups in its structure, making its quantification difficult. The proposed method exhibits a linear range from 5.0 to 600 µg/kg with limits of detection of 1.37, 0.69 and 1.22 μg/kg, limits of quantification of 4.11, 2.08, and 3.66 μg/kg for glyphosate, AMPA, and glufosinate, respectively, and adequate repeatability and reproducibility (coefficients of variation <8.0% and recovery percentages between 93.56% and 99.10%). The matrix effect was calculated for each analyte, proving to be a good alternative for the determination of these contaminants. The described method was applied to 46 soil samples collected from crop fields in Hidalgo, Mexico, with concentrations varying from not detected to 4.358 μg/kg (for AMPA).

Fungal diseases are a major threat to the horticultural industry and cause substantial postharvest losses. While secondary metabolites from Trichoderma sp. have been explored for their antifungal properties, limited information exists on the phenolic compounds produced by less studied species like Trichoderma longibrachiatum. In this study, phenolic compounds were extracted from a liquid culture of T. longibrachiatum using various solvents and methods (conventional and ultrasonic-assisted). Phenolic compounds were quantified by spectrophotometry and identified by high-performance liquid chromatography with diode array detection (HPLC-DAD). The antifungal activity against Alternaria alternata and Fusarium oxysporum was determined by mycelial growth inhibition assays, maximum growth rate (µ_max) by the Gompertz equation, and spore germination tests. Although no significant differences (p ≥ 0.05) were found between the extraction methods, the type of solvent significantly influenced the phenolic content (p ≤ 0.05). Extraction with 70% ethanol showed the highest content of phenolic compounds and flavonoids. More than eight phenolic compounds were detected. Further, this is the first report of the phenolics ferulic, chlorogenic and p-coumaric acids identification in T. longibrachiatum, along with flavonoids such as epicatechin and quercetin, among others. The 70% ethanolic extracts notably inhibited the mycelial growth of A. alternata and F. oxysporum, reducing their maximum growth rate by 1.5 and 1.4 mm/h, respectively. Furthermore, p-coumaric and ferulic acids significantly inhibited spore germination of both pathogens, with a minimum inhibitory concentration (MIC) of 1.5 mg/mL and a minimum fungicidal concentration (MFC) of 2 mg/mL. These findings demonstrate the potential of T. longibrachiatum and its phenolic compounds as viable alternatives for biological control in horticulture and postharvest disease management.

There has been increased interest in phytoestrogens due to their potential effect in reducing the risk of developing cancer and cardiovascular disease. To evaluate phytoestrogens’ exposure, sensitive and accurate methods should be developed for their quantification in food and human matrices. The present study aimed to validate a comprehensive liquid chromatography-mass spectrometry (LC-MS) method for the quantification of 16 phytoestrogens: Biochanin A, secoisolariciresinol, matairesinol, enterodiol, enterolactone, equol, quercetin, genistein, glycitein, luteolin, naringenin, kaempferol, formononetin, daidzein, resveratrol and coumestrol, in food, serum and urine. Phytoestrogen extraction was performed by solid-phase extraction (food and serum) and liquid-liquid extraction (urine), and analyzed by LC diode-array detector (DAD) coupled with a single quadrupole MS with electrospray ionization (ESI) in negative mode. Validation included selectivity, sensibility, recovery, accuracy and precision. The method was proved to be specific, with a linear response (r² ≥ 0.97). Limits of quantification were 0.008–3.541 ng/mL for food, 0.01–1.77 ng/mL for serum and 0.003–0.251 ng/mL for urine. Recoveries were 66–113% for food, 63–104% for serum and 76–111% for urine. Accuracy and precision were below 15% (except for enterodiol in food with 18% and resveratrol in urine with 15.71%). The method is suitable for the quantification of a wide number of phytoestrogens in food, serum and urine. The method was successfully applied in highly consumed food items (n = 6) from North Mexico and biofluids from healthy women (n = 10).

El género Fusarium afecta una amplia diversidad de cultivos hortícolas, generando importantes pérdidas económicas. Estos hongos son capaces de infectar a las plantas durante su desarrollo y aún después de cosecha. El uso de extractos vegetales bioactivos es una estrategia de control amigable al medio ambiente, no dañinas al consumidor, y de bajo costo. Los compuestos de origen vegetal han resultado ser promisorios en el control de enfermedades fúngicas. Cucurbita foetidissima es una cucurbitácea con alto contenido de metabolitos secundarios presentes en su raíz con poder fungicida. El presente trabajo se realizó durante 2017-2019 y se evaluó el efecto antifúngico de extractos radiculares de C. foetidissima frente a distintas especies de Fusarium bajo condiciones in vitro. Se obtuvieron extractos etanólicos y metanólicos radiculares de C. foetidissima. Se cuantificaron los metabolitos fenoles, flavonoides, terpenoides y saponinas. Se evaluó la capacidad antifúngica de los extractos sobre el crecimiento de Fusarium oxysporum, F. equiseti y F. solani in vitro. Los extractos metanólicos presentaron mayor concentración de fenoles, terpenoides y saponinas en comparación a los extractos etanólicos; estos últimos tuvieron mayor concentración de flavonoides. El extracto etanólico alcanzó mayor efecto antifúngico, inhibiendo entre 60 y 80% del crecimiento de las tres especies de Fusarium. El extracto etanólico radicular de C. foetidissima posee capacidad fungistática moderada para inhibir el crecimiento micelial in vitro de distintas especies de Fusarium, lo que sugiere el potencial de su uso para retrasar o atenuar la aparición de los síntomas asociados a fusariosis.