Effect of a Change in the CaCl2/Pectin Mass Ratio on the Particle Size, Rheology and Physical Stability of Lemon Essential Oil/W Emulgels.

A three-step (rotor-stator-microfluidization-rotor stator) protocol was used to prepare 15% lemon essential oil in water emulgels using a mixture of Tween 80 and Span 20 surfactants as low molecular mass emulsifiers and 0.4% low-methoxyl citrus peel pectin as a gelling agent. Ca2+ was used as a gel-promoting agent. Different CaCl2/pectin mass ratio values from 0.3 to 0.7 were used. Emulgels showed a microstructure consisting of oil droplets embedded in a sheared gel matrix, as demonstrated by bright field optical microscopy. Laser diffraction tests showed multimodal particle size distributions due to the coexistence of oil droplets and gel-like particles. Multiple light scattering tests revealed that the physical stability of emulgels was longer as the CaCl2/pectin mass ratio decreased and that different destabilization mechanisms took place. Thus, incipient syneresis became more important with increasing CaCl2 concentration, but a parallel creaming mechanism was detected for CaCl2/pectin mass ratio values above 0.5. Dynamic viscoelastic and steady shear flow properties of the emulgels with the lowest and highest CaCl2/pectin mass ratio values were compared as a function of aging time. The lowest ratio yielded an emulgel with enhanced connectivity among fluid units as indicated by its wider linear viscoelastic region, higher storage modulus, loss modulus and viscosity values, and more shear thinning properties than those of the emulgel formulated with the highest CaCl2/pectin mass ratio. The evolution of the dynamic viscoelastic properties with aging time was consistent with the information provided by monitoring scans of backscattering as a function of sample height.

Nursing Students' Perceptions of Smartphone Use in the Clinical Care and Safety of Hospitalised Patients.

Smartphones have become an indispensable item for nursing students. The use of these devices in the clinical setting could have various effects on the clinical work of nursing students. This study was to explore nursing students' perceptions of their lived experiences of smartphone use in the clinical setting, in regard to patient safety. A descriptive phenomenological study was carried out. A total of 24 nursing students from a university in the southeast of Spain participated in this study. There were 10 in-depth interviews and two focal groups from January to May 2020. The data analysis was performed using ATLAS.TI software to identify the emergent topics. The COREQ Checklist was used to prepare the manuscript. Three principal topics were identified that illustrated the nursing students' experiences and perceptions of smartphone use in the clinical setting (1): Using smartphones in the clinical setting as a personal resource, (2) smartphones as a support mechanism for making clinical decisions, (3) impact of smartphones on patient care. The nursing students perceived smartphones as a support mechanism for making clinical decisions and for patient care. Smartphone use during clinical practicums may influence the quality of patient-centred communication and threaten clinical safety. The results of this study provide knowledge on the use of smartphones by nursing students in the clinical setting, which could help to establish measures that guarantee adequate patient care and responsible use of these devices.