Elaboration and characterization of nanoemulsion with orange essential oil and pectin.

BACKGROUND: Nanoemulsions formulated with citric essential oils are currently of interest because of their physical and chemical properties and multiple applications in areas such as the food industry or agrochemicals. These are thermodynamically unstable and have almost Newtonian flow behaviour, but a suitable formulation allows systems to be obtained with good physical stability and rheological properties. The addition of pectin makes this possible. In this work, food nanoemulsions formulated with pectin, orange essential oil (5 wt%), and Tween 80 were obtained by microfluidization. First, the effect of Tween 80 concentration from 1 to 5 wt% on emulsions without pectin was evaluated. Then, pectin was added to the most stable nanoemulsion obtained and two variables were studied: the pectin solution concentration (from 2 to 6 wt%) and the pectin/emulsion ratio (1:1 or 2:1) at a fixed pectin concentration. RESULTS: Rheological, laser diffraction, and multiple light scattering techniques were employed to determine the content of Tween 80 that results in the most stable nanoemulsion without pectin, which was 3 wt%. In addition, these techniques were used to determine the structure and physical stability of the nanoemulsions containing orange essential oil and pectin. The results obtained showed that the emulsions containing 2 wt% pectin were destabilized before 24 h. Furthermore, the emulsion with 6 wt% pectin and a 2:1 pectin/emulsion ratio showed the highest viscosity and the lowest mean diameters, and therefore the greatest stability. CONCLUSION: This work extends the knowledge of formulation of nanoemulsions and using essential oils. © 2021 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

Processing and Formulation Optimization of Mandarin Essential Oil-Loaded Emulsions Developed by Microfluidization.

Emulsions can be used as delivery systems for bioactive ingredients for their incorporation in food products. Essential oils are natural compounds found in plants that present antioxidant and antimicrobial activity. Therefore, the main goal of this work was to develop emulsions, containing mandarin essential oil stabilized by two food-grade surfactants and guar gum, and to evaluate their physical stability. The initial droplet size of emulsions developed by microfluidization was optimized, obtaining diameters below one micron regardless of the processing conditions. However, the emulsion processed at 25,000 psi and one pass exhibited the lowest mean droplet sizes and polidispersity, and therefore, a higher stability. Different ratios of Tween 80 and Span 80 were assessed as stabilizers. Results obtained indicated that the ratio of surfactants had a significant effect on the mean droplet sizes, physical stability, and rheological properties. Thus, we found that the optimum ratio of surfactants was 75/25 (Tween80/Span80) on account of the lowest droplet mean diameters, lack of coalescence, and a low creaming rate. The rheological characterization of the stable emulsions showed a shear thinning flow behavior, and G″ (loss modulus) values higher than G' (storage modulus) values, in all the frequency range. The rheological behavior may be governed by the guar gum, which was confirmed by field emission scanning electron microscopy (FESEM). This research can be considered as the starting point for future applications of mandarin essential oil in emulsions, which can be incorporated in products as food preservatives.

Cribado para el trastorno bipolar en pacientes de atención primaria que presentan síntomas psicológicos / Screening for bipolar disorder in Primary Care patients with psychological symptoms

OBJETIVO: Estimar la proporción de resultados positivos en el cribado del trastorno bipolar (TB) entre los pacientes de atención primaria que consultan por problemas de naturaleza psicológica, y analizar sus características. DISEÑO: Estudio descriptivo transversal multicéntrico. Emplazamiento: Diecinueve consultas de atención primaria en diferentes comunidades autónomas. PACIENTES: La muestra estuvo formada por 360 pacientes consecutivos de atención primaria con edades entre 18 y 70 años visitados por síntomas psicológicos. Mediciones: El cribado para TB se realizó mediante el Mood Disorders Questionnaire. Se obtuvieron datos sobre calidad de vida (EuroQol-5D), impacto funcional (Sheehan Disability Inventory) y, mediante revisión de historias clínicas, datos sobre comorbilidad psiquiátrica y consumo de psicofármacos. RESULTADOS: Se obtuvo una proporción de cribados positivos del 11,9% (IC 95%: 8,8-15,7%). Solo en 2 de estos pacientes estaba registrado el diagnóstico de TB, y aunque más de la mitad recibían tratamiento con antidepresivos, solo 2 recibían tratamiento con estabilizadores del estado de ánimo. El cribado positivo se asocia a peor calidad de vida, a disfunción laboral, social y familiar, y a mayor estrés percibido. CONCLUSIONES: El cribado del TB en pacientes de atención primaria con otros problemas psicológicos da lugar a una notable proporción de resultados positivos, lo que indica que puede haber una prevalencia relevante de pacientes con TB, la mayor parte de ellos no diagnosticados y no tratados adecuadamente. Es necesario profundizar en la investigación para determinar el eventual papel que puede o debe asumir la atención primaria en la detección, el diagnóstico o el manejo de este trastorno

OBJECTIVE: To estimate the proportion of positive results in the screening of bipolar disorder (BD) among primary care patients presenting with psychological symptoms, and to analyze their characteristics. DESIGN: Multicenter cross-sectional study. Settings: Nineteen Primary Care clinics in different Spanish regions. PATIENTS: A total of 360 consecutive primary care patients aged 18 to 70, presenting with psychological symptoms. Measurements: Screening for BP was performed by means of the Mood Disorders Questionnaire. Data on quality of life (EuroQol-5D) and functional impairment (Sheehan Disability Inventory) were obtained. Data on psychiatric comorbidity and data on the use of psychotropic medication were acquired by review of medical records. RESULTS: Of the patients screened, 11.9% were positive (95% CI: 8.8%-15.7%). Only two patients had a diagnosis of BP in their clinical records and, although more than half received treatment with antidepressants, only two received treatment with mood stabilizers. Positive screening is associated with work, social and family dysfunction, greater perceived stress and poor quality of life. CONCLUSIONS: BD screening in primary care patients with psychological problems leads to a striking proportion of positive results, indicating that there may be a significant prevalence of BP patients, most of them undiagnosed and untreated. Further research is needed to determine the role that Primary Care can or should assume in the screening, diagnosis and management of this disorder

[Screening for bipolar disorder in primary care patients with psychological symptoms]. / Cribado para el trastorno bipolar en pacientes de atención primaria que presentan síntomas psicológicos.

OBJECTIVE: To estimate the proportion of positive results in the screening of bipolar disorder (BD) among primary care patients presenting with psychological symptoms, and to analyze their characteristics. DESIGN: Multicenter cross-sectional study. SETTINGS: Nineteen Primary Care clinics in different Spanish regions. PATIENTS: A total of 360 consecutive primary care patients aged 18 to 70, presenting with psychological symptoms. MEASUREMENTS: Screening for BP was performed by means of the Mood Disorders Questionnaire. Data on quality of life (EuroQol-5D) and functional impairment (Sheehan Disability Inventory) were obtained. Data on psychiatric comorbidity and data on the use of psychotropic medication were acquired by review of medical records. RESULTS: Of the patients screened, 11.9% were positive (95%CI: 8.8%-15.7%). Only two patients had a diagnosis of BP in their clinical records and, although more than half received treatment with antidepressants, only two received treatment with mood stabilizers. Positive screening is associated with work, social and family dysfunction, greater perceived stress and poor quality of life. CONCLUSIONS: BD screening in primary care patients with psychological problems leads to a striking proportion of positive results, indicating that there may be a significant prevalence of BP patients, most of them undiagnosed and untreated. Further research is needed to determine the role that Primary Care can or should assume in the screening, diagnosis and management of this disorder.