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BACKGROUND: The Five-Factor Borderline Inventory-Short Form (FFBI-SF) is a self-report measure developed to assess traits of Borderline Personality Disorder (BPD) from the perspective of the Five-Factor Model of general personality. This study was designed to examine the factor structure, internal consistency, and convergent/discriminant validity of the Persian FFBI-SF in a sample of Iranian university students. METHODS: A total of 641 university students (M-age = 28.04, SD = 8.21, 66.7% women) completed the online forms of the FFBI-SF, PID-5-BF, and Mini IPIP. RESULTS: Confirmatory factor analysis supported the original and modified (without item 47) twelve-factor models. Also, Cronbach's alpha (α) for the FFBI-SF scores ranged from unacceptable to excellent ranges. However, when relying on MIC values to measure internal consistency, the FFBI-SF Total and subscale scores demonstrated adequate internal consistency. Finally, the FFBI Total and subscale scores showed the expected relations with other personality measures scores (e.g., Neuroticism, Antagonism, and Conscientiousness), which supports the validity of the interpretation of the FFBI-SF scores. CONCLUSIONS: The findings indicated that FFBI-SF is a useful tool with sound psychometric properties for assessing BPD traits in Iranian students and may spark research in other Iranian settings (e.g., community and clinical samples).
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Transtornos da Personalidade , Adulto , Feminino , Humanos , Irã (Geográfico) , Masculino , Inventário de Personalidade , Psicometria , Reprodutibilidade dos TestesRESUMO
Conventional antibiotic susceptibility testing (AST) assays such as broth microdilution and Kirby-Bauer disk diffusion are time-consuming (e.g., 24-72 h) and labor-intensive. Here, we present a microfluidic platform to perform AST assays with a broad range of antibiotic concentrations and controls. A culture medium stream was serially enriched with antibiotics along the length of the platform via diffusion and flow-directing mass convection mechanisms, generating a concentration gradient captured in a series of microchamber duplicates. We observed an agreement between the simulated and experimental concentration gradients and applicability to a variety of different molecules by changing the loading time according to a simple linear equation. The AST assay in our platform is based on bacterial metabolism, indicated by resazurin fluorescence. The small reaction volume enabled a minimum inhibitory concentration (MIC) to be determined in 4-5 h. Proof-of-concept functionality testing, using human isolates and clinically important antibiotics from different classes, indicated a high rate of agreement (94%: MIC within ±1 two-fold dilution of the reference method) of on-chip MICs and conventional broth microdilution. Overall, our results showed that this microfluidic platform is capable of determining antibiotic susceptibility in a rapid and reliable manner.
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Convecção , Microfluídica , Antibacterianos/farmacologia , Bactérias , Humanos , Testes de Sensibilidade MicrobianaRESUMO
Processing metal-organic frameworks (MOFs) into hierarchical macroscopic materials can greatly extend their practical applications. However, current strategies suffer from severe aggregation of MOFs and limited tuning of the hierarchical porous network. Now, a strategy is presented that can simultaneously tune the MOF loading, composition, spatial distribution, and confinement within various bio-originated macroscopic supports, as well as control the accessibility, robustness, and formability of the support itself. This method enables the good dispersion of individual MOF nanoparticles on a spiderweb-like network within each macrovoid even at high loadings (up to 86â wt %), ensuring the foam pores are highly accessible for excellent adsorption and catalytic capacity. Additionally, this approach allows the direct pre-incorporation of other functional components into the framework. This strategy provides precise control over the properties of both the hierarchical support and MOF.
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The rise of antimicrobial resistance is challenging for physicians in clinical practice to prescribe antibiotics that are effective against bacterial infections. Conventional antibiotic susceptibility testing (AST) is labor-intensive and time-consuming (18-24 h). Newly emerging technologies such as microfluidics may enable more rapid AST assay time. In this study, we utilize a nanoliter-sized microchamber/microarray-based microfluidic (N-3M) platform to reduce the AST assay time and rapidly determine the minimum inhibitory concentrations of different antibiotics. Bacterial suspensions, with or without antibiotics, are loaded into small nanoliter-sized chambers, and the change in fluorescent intensity emitted from resazurin reduction, which correlated with bacterial growth, is measured. We demonstrate the reproducibility, functionality, and efficiency of our N-3M platform for numerous wild-type clinical bacterial isolates including Escherichia coli, Klebsiella pneumoniae, and Enterococcus faecalis. The time-to-result of our N-3M platform varies between â¼1-3 h, depending on growth rates of different bacterial species. We believe that our proposed N-3M platform is robust, is easy-to-implement, has a short time-to-result, and can be applicable for microbial AST in clinical applications.
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Antibacterianos/farmacologia , Bactérias/efeitos dos fármacos , Testes de Sensibilidade Microbiana/métodos , Microfluídica , Algoritmos , Enterococcus faecalis/efeitos dos fármacos , Escherichia coli/efeitos dos fármacos , Klebsiella pneumoniae/efeitos dos fármacos , Análise em Microsséries , Oxazinas/farmacologia , Reprodutibilidade dos Testes , Xantenos/farmacologiaRESUMO
Despite the development potential in the field of nanotechnology, there is a concern about possible effects of nanoparticles on the environment and human health. In this study, silver nanoparticles (AgNPs) were synthesized by 'green' and 'chemical' methods. In the wet-chemistry method, sodium borohydrate, sodium citrate and silver nitrate were used as raw materials. Leaf extract of Nigella sativa was used as reducing as well as capping agent to reduce silver nitrate in the green synthesis method. In addition, toxic responses of both synthesized AgNPs were monitored on bone-building stem cells of mice as well as seed germination and seedling growth of six different plants (Lolium, wheat, bean and common vetch, lettuce and canola). In both synthesis methods, the colorless reaction mixtures turned brown and UV-visible spectra confirmed the presence of silver nanoparticles. Scanning electron microscope (SEM) observations revealed the predominance of silver nanosized crystallites and fourier transform infra-red spectroscopy (FTIR) indicated the role of different functional groups in the synthetic process. MTT assay showed cell viability of bone-building stem cells of mice was further in the green AgNPs synthesized using black cumin extract than chemical AgNPs. IC50 (inhibitory concentrations) values for seed germination, root and shoot length for 6 plants in green AgNPs exposures were higher than the chemical AgNPs. These results suggest that cytotoxicity and phytotoxicity of the green synthesized AgNPs were significantly less than wet-chemistry synthesized ones. This study indicated an economical, simple and efficient ecofriendly technique using leaves of N. sativa for synthesis of AgNPs and confirmed that green AgNPs are safer than chemically-synthesized AgNPs.
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Nanopartículas Metálicas/química , Nigella sativa/química , Extratos Vegetais/farmacologia , Folhas de Planta/química , Prata/química , Animais , Materiais Biocompatíveis/química , Concentração Inibidora 50 , Inseticidas/análise , Larva/efeitos dos fármacos , Camundongos , Microscopia Eletrônica de Varredura , Espectroscopia de Infravermelho com Transformada de Fourier , Difração de Raios XRESUMO
In recent years, the widespread use of the Internet has led to increasing concerns about problematic behaviors related to excessive Internet use and their potential consequences. This study aimed to investigate the relationship between Internet addiction (IA), body mass index (BMI), and emotion dysregulation (ED). Specifically, the study aimed to determine if IA significantly predicts obesity and if both Internet addiction and obesity can be significantly predicted by ED. 367 school-attending adolescents (Mage = 13.35; SD = 0.82; 49% girls) in Tekab participated in the study. Participants completed the Difficulties in Emotion Regulation Scale (DERS) and the Internet Addiction Test (IAT), while BMI was calculated using self-reported data to assess their obesity levels. The results indicated that ED significantly predicted both IA and increased BMI levels (p < 0.001). Furthermore, IA also significantly predicted elevated BMI levels (p < 0.001). Our findings showed that ED significantly predicted both higher IA and BMI values, while IA also significantly predicted elevated BMI levels These results have important implications for treatment. To address excessive Internet use or overeating behavior in individuals with either condition, it may be necessary to target the underlying emotional dysregulation that contributes to the problem.
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The dimensional approach to Schizotypal Personality Disorder (SPD) indicates that SPD includes a constellation of maladaptive personality traits on a continuum with general personality functioning. This study aimed to compare executive functions (EFs) in low and high-level schizotypal individuals. Using a convenient sampling method, we recruited 120 individuals, from which 30 individuals with high schizotypal trait levels (fourth quartile) and 30 participants with lower schizotypal trait levels (first quartile) were selected based on their scores on the schizotypal personality disorder questionnaire. Then, participants from the two groups were administered the Corsi Block-Tapping Test (CBTT), Wisconsin Card Sorting Test (WCST), and Continuance Performance Test (CPT). The results indicated individuals with higher schizotypy trait levels performed significantly poorer in tasks measuring working-visual-spatial memory, cognitive flexibility, sustained attention, and response inhibition. This pattern of results indicated that EF dysfunctions in individuals with higher schizotypy trait levels would cause significant disturbances in multiple areas of life. The practical implications of the findings are further discussed.
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The female reproductive tract simultaneously guides and selects high-quality sperm using rheotaxis in mammalian species. Sperm quality, however, is traditionally evaluated only by their movement velocities and concentration using computer-assisted sperm analysis (CASA), which ignores sperm rheotaxis. Here, by mimicking the female reproductive tracts' dimensions and hydrodynamic features, a new method is introduced to quantify sperm rheotaxis ability for evaluating semen quality. The combination of our RHEOtaxis quaLity indEX (RHEOLEX) and motile sperm concentration is able to predict sperm fertility levels in artificial insemination at various shear rates within 5 minutes. This means that RHEOLEX could be a biomarker for determining male in vivo fertility, unlike conventional semen quality parameters which fail to provide statistically significant predictions. In addition, a high RHEOLEX is associated with a low DNA fragmentation index (DFI), showing that this new parameter is able to identify low-DFI samples. Not only does this work highlight the importance of rheotaxis in determining male in vivo fertility, but it also provides a solid benchmark for developing fast microfluidic devices for male fertility prediction as well as DFI. Last, the data imply that the female reproductive tract might use rheotaxis to keep sperm with fragmented DNA from reaching the fertilization site.
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Análise do Sêmen , Motilidade dos Espermatozoides , Animais , Fragmentação do DNA , Feminino , Fertilidade , Masculino , Mamíferos , Análise do Sêmen/métodos , EspermatozoidesRESUMO
School alienation (SA) refers to a collection of negative attitudes toward the social and academic realms of schooling consisting of cognitive and affective components. The current study was designed to examine whether emotion dysregulation, social competence, and peer problems predict school alienation. In this vein, 300 school-attending adolescents in Sarab were recruited and completed difficulties in emotion regulation scale (DERS), academic alienation questionnaire (AAQ), social competence test (SCT), and index of peer relations (IPR) measures, but 280 (M age = 16.35; SD = 0.82; 46% girls) completed data were gathered. The results of hierarchical multiple regression indicated that school alienation was significantly predicted by emotion dysregulation, social competency, and peer problems. In conclusion, our findings suggest that school psychologists and other clinicians design interventions to improve the students' shortcomings in emotion regulations, social competency, and peer relationships domains.
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Motility is one of the most important factors in sperm migration toward an egg. Therefore, sperm separation based on motility might enhance sperm selection for infertility treatments. Conventional centrifugation-based methods increase the risk of damage to sperm cells. Microfluidic systems, on the other hand, can sort sperm in a less intrusive way, but their efficiency and throughput still needs improvement, especially in low-concentration samples (oligozoospermia). Here, a microchamber-based microfluidic platform is demonstrated that can separate progressively motile sperm from non-viable sperm and debris, and trap nonprogressive sperm in microchambers. This platform can be operated in a short period of time (<10 min) with an excellent degree of controllability with no sample preparation. Sperm were screened in a 384-microchamber platform. The mean average-path velocity of the motile sperm in the collected sample increased significantly, from 57 ± 10 µm s-1 in the raw semen sample to 81 ± 13 µm s-1. The DNA Integrity of the separated sperm showed 20% improvement over the raw sample which indicated that separated sperm were of higher quality. We began with a 22.5 µL raw bovine sperm sample which had a concentration of 8.5 million sperm per milliliter (M mL-1) with 38% motility. After separation, the concentration of the collected sperm was 2.1 M mL-1 with a motility rate of 90%. This corresponds to a 75% retrieval efficiency and the selection of approximately 5.2 × 104 progressively motile spermatozoa. Our results show that the microchamber depth does not affect the residence time of motile sperm; therefore, it is possible to inspect higher sample volumes within the same time frame. This microfluidic platform may provide an easy-to-implement solution for high-throughput, robust, and efficient, collection of progressive sperm with the DNA integrity needed for assisted reproductive technologies (ARTs). However, further studies are necessary to show the implications of this method in human cases.
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Microfluídica , Motilidade dos Espermatozoides , Animais , Bovinos , Separação Celular , Humanos , Masculino , EspermatozoidesRESUMO
Fast determination of antimicrobial agents' effectiveness (susceptibility/resistance pattern) is an essential diagnostic step for treating bacterial infections and stopping world-wide outbreaks. Here, we report an egg-like multivolume microchamber-based microfluidic (EL-MVM2) platform, which is used to produce a wide range of gradient-based antibiotic concentrations quickly (â¼10 min). The EL-MVM2 platform works based upon testing a bacterial suspension in multivolume microchambers (microchamber sizes that range from a volume of 12.56 to 153.86 nL). Antibiotic molecules from a stock solution diffuse into the microchambers of various volumes at the same loading rate, leading to different concentrations among the microchambers. Therefore, we can quickly and easily produce a robust antibiotic gradient-based concentration profile. The EL-MVM2 platform's diffusion (loading) pattern was investigated for different antibiotic drugs using both computational fluid dynamics simulations and experimental approaches. With an easy-to-follow protocol for sample loading and operation, the EL-MVM2 platform was also found to be of high precision with respect to predicting the susceptibility/resistance outcome (>97%; surpassing the FDA-approval criterion for technology-based antimicrobial susceptibility testing instruments). These features indicate that the EL-MVM2 is an effective, time-saving, and precise alternative to conventional antibiotic susceptibility testing platforms currently being used in clinical diagnostics and point-of-care settings.
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Antibacterianos/farmacologia , Desenho de Equipamento , Escherichia coli/efeitos dos fármacos , Dispositivos Lab-On-A-Chip , Testes de Sensibilidade Microbiana/instrumentação , Meios de Cultura , Indicadores e Reagentes/química , Microscopia de Fluorescência , Oxazinas/química , Xantenos/químicaRESUMO
Antimicrobial resistance is a growing problem, necessitating rapid antimicrobial susceptibility testing (AST) to enable effective in-clinic diagnostic testing and treatment. Conventional AST using broth microdilution or the Kirby-Bauer disk diffusion are time-consuming (e.g., 24-72 h), labor-intensive, and costly and consume reagents. Here, we propose a novel gradient-based microchamber microfluidic (GM2) platform to perform AST assay for a wide range of antibiotic concentrations plus zero (positive control) and maximum (negative control) concentrations all in a single test. Antibiotic lateral diffusion within enriched to depleted (Cmax and zero, respectively) cocurrent flowing fluids, moving alongside a micron-sized main channel, is led to form an antibiotic concentration profile in microchambers, connected to the depleted side of the main channel. We examined the tunability of the GM2 platform, in terms of producing a wide range of antibiotic concentrations in a gradient mode between two consecutive microchambers with changing either the loading fluids' flow rates or their initial concentrations. We also tested the GM2 platform for profiling bacteria associated with human Crohn's disease and bovine mastitis. Time to result for performing a complete AST assay was â¼ 3-4 h in the GM2 platform. Lastly, the GM2 platform tracked the bacterial growth independent of an antibiotic mechanism of action or bacterial species in a robust and easy-to-implement fashion.
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Antibacterianos , Microfluídica , Animais , Antibacterianos/farmacologia , Bactérias , Bovinos , Feminino , Humanos , Testes de Sensibilidade MicrobianaRESUMO
Studying the potency of small-molecules on eukaryotic and prokaryotic cells using conventional biological settings requires time-consuming procedures and large volumes of expensive small-molecules. Microfluidics could significantly expedite these assays by enabling operation in high-throughput and (semi)automated modes. Here, we introduce a microfluidics platform based on multi-volume microchamber arrays that can produce a wide range of small-molecule concentrations with a desired gradient-based profile for rapid and precise biological testing within a single device with minimal hands-on time. The concept behind this device is based on introducing the same amount of a small-molecule into microchambers of different volumes to spontaneously generate a gradient concentration profile via diffusion. This design enables to obtain an unprecedented concentration range (e.g., three orders of magnitude) that can be easily adjusted, allowing us to pinpoint the precise effect of small-molecules on pre-loaded prokaryotic and eukaryotic cells. We also propose a comprehensive relationship for determining the loading time (the only required parameter for implementing this platform) in order to study the effects of any small-molecule on a biological species in a desired test. We demonstrate the versatility of this microfluidics platform by conducting two small-molecule assays-antimicrobial resistance and sugar-phosphate toxicity for both eukaryotic and prokaryotic biological systems.
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Técnicas Biossensoriais , Microfluídica , BioensaioRESUMO
Autistic traits (ATs) include symptoms associated with autism spectrum conditions (ASCs), which are assumed to be continuously distributed across the general population. Studies have indicated the cultural differences in the expression of ATs. Notwithstanding, our literature review indicated that studies on cross-cultural differences in the expression of ATs included samples from different countries. This is the first study designed to compare the expression of ATs between different ethnicities from the same country. Using the Autism-spectrum Quotient (AQ-28), we examined the possible cultural differences in the expression of autistic traits from four groups of students with different ethnic backgrounds, including Turkish (n = 262), Persian (n = 290), Kurdish (n = 300), and Luri (n = 307) students. Behaviors associated with autistic traits were reported overall higher for males than females. Also, significant cultural differences in autistic traits were found that were different for males and females. Furthermore, while the medical sciences student group scored significantly higher than the humanities group in the Imagination dimension, the humanities group had significantly higher scores in Number/Pattern dimensions than the engineering and medical sciences groups. Altogether, our results provide further support for the idea that the expression of ATs is significantly influenced by culture. A significant limitation of the current study was that groups were not matched with respect to age, percentage of male participants, and fields of studies and that these variables may influence the AQ scores.
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ω-3 polyunsaturated fatty acids, naturally found in fish oil, are highly desirable for their associated health benefits. However, they are highly prone to oxidation and degradation. We examined the feasibility of simultaneously adding a solid lipid (palmitic acid) and an antioxidant (quercetin) into a whey-protein-isolate-stabilized solid lipid nanoparticle emulsion for encapsulating fish oil. The goal was to find a rational and new formulation containing both solid lipid and antioxidant that can encapsulate fish oil and give it the best physicochemical stability. Our results show that adding palmitic acid improved the physical stability of the emulsions by decreasing the size of the oil-in-water droplets. On the basis of the thiobarbituric acid reactive substances assay, we found out that at low concentrations of palmitic acid the addition of quercetin played a dominant role in increasing the oxidation stability of fish oil. On the contrary, at high concentrations of palmitic acid, it was palmitic acid that dominated the oxidation inhibition by the solidification of the encapsulates' core.
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Óleos de Peixe/química , Nanopartículas/química , Ácido Palmítico/química , Quercetina/química , Antioxidantes/química , Emulsões/química , Ácidos Graxos Ômega-3/química , Oxirredução , Proteínas do Soro do Leite/químicaRESUMO
Nucleic acid amplifications, such as polymerase chain reaction (PCR), are very beneficial for diagnostic applications, especially in the context of bacterial or viral outbreaks due to their high specificity and sensitivity. However, the need for bulky instrumentation and complicated protocols makes these methods expensive and slow, particularly for low numbers of RNA or DNA templates. In addition, implementing conventional nucleic acid amplification in a high-throughput manner is both reagent- and time-consuming. We bring droplet-based microfluidics and loop-mediated isothermal amplification (LAMP) together in an optimized operational condition to provide a sensitive biosensor for amplifying extracted RNA templates for the detection of Salmonella typhimurium (targeting the invA gene). By simultaneously performing â¼106 LAMP-assisted amplification reactions in picoliter-sized droplets and applying a new mathematical model for the number of droplets necessary to screen for the first positive droplet, we study the detection limit of our platform with pure culture and real samples (bacterial contaminated milk samples). Our LAMP-assisted droplet-based microfluidic technique was simple in operation, sensitive, specific, and rapid for the detection of pathogenic bacteria Salmonella typhimurium in comparison with well-established conventional methods. More importantly, the high-throughput nature of this technique makes it suitable for many applications in biological assays.
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Microfluídica/métodos , Técnicas de Amplificação de Ácido Nucleico/métodos , RNA Bacteriano/análise , Salmonella typhimurium/isolamento & purificação , Animais , Proteínas de Bactérias/genética , Técnicas Biossensoriais/métodos , Corantes Fluorescentes/química , Contaminação de Alimentos/análise , Limite de Detecção , Leite/microbiologia , Modelos Teóricos , RNA/química , Salmonella typhimurium/genética , Shigella flexneri/genética , Shigella flexneri/isolamento & purificação , Staphylococcus aureus/genética , Staphylococcus aureus/isolamento & purificaçãoRESUMO
Point-of-care (POC) diagnostics have shown excellent potential in rapid biological analysis and health/disease monitoring. Here, we introduce a versatile, cost-effective, flexible, and wearable POC biomarker patch for effective sweat collection and health monitoring. We design and fabricate channels/patterns on filter paper using wax printing technology, which can direct sweat to collection and biomarker detection zones on the proposed platform. The detection zones are designed to measure the amount of collected sweat, in addition to measuring the sweat pH, and glucose (a potential diabetic biomarker), and lactate concentrations. It is significantly challenging to measure glucose in human sweat by colorimetric methods due to the extremely low glucose levels found in this medium. However, we overcame this issue by effectively engineering our wearable biosensor for optimal intake, storage, and evaporation of sweat. Our design concentrates the colorant (indicator) into a small detection zone and significantly increases the sensitivity for the sweat glucose sensing reactions. The device can thus detect glucose in physiological glucose concentration range of 50-300 µM. This cost-effective and wearable biosensor can provide instant in situ quantitative results for targets of interest, such as glucose, pH, and lactate, when coupled with the imaging and computing functionalities of smartphones. Meanwhile, it is also feasible to extract the air-dried sweat from the storage zone for further ex situ measurements of a broader portfolio of biomarkers, leading to applications of our wearable biosensor in personalized nutrition and medicine.
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Técnicas Biossensoriais/métodos , Suor/metabolismo , Técnicas Biossensoriais/economia , Técnicas Biossensoriais/instrumentação , Glicemia/análise , Glucose/análise , Humanos , Concentração de Íons de Hidrogênio , Ácido Láctico/análise , Avaliação Nutricional , Sistemas Automatizados de Assistência Junto ao Leito , Suor/química , Dispositivos Eletrônicos VestíveisRESUMO
Conventional delivery systems for hydrophilic material still face critical challenges toward practical applications, including poor retention abilities, lack of stimulus responsiveness, and low bioavailability. Here, we propose a robust encapsulation strategy for hydrophilic cargo to produce a wide class of aqueous core-shell-shell coconut-like nanostructures featuring excellent stability and multifunctionality. The numerous active groups (-SH, -NH2, and -COOH) of the protein-polysaccharide wall material enable the formation of shell-cross-linked nanocapsules enclosing a liquid water droplet during acoustic cavitation. A subsequent pH switch can trigger the generation of an additional shell through the direct deposition of non-cross-linked protein back onto the cross-linked surface. Using anthocyanin as a model hydrophilic bioactive, these nanocapsules show high encapsulation efficiency, loading content, tolerance to environmental stresses, biocompatibility, and high cellular uptake. Moreover, the composite double shells driven by both covalent bonding and electrostatics provide the nanocapsules with pH/redox dual stimuli-responsive behavior. Our approach is also feasible for any shell material that can be cross-linked via ultrasonication, offering the potential to encapsulate diverse hydrophilic functional components, including bioactive molecules, nanocomplexes, and water-dispersible inorganic nanomaterials. Further development of this strategy should hold promise for designing versatile nanoengineered core-shell-shell nanoplatforms for various applications, such as the oral absorption of hydrophilic drugs/nutraceuticals and the smart delivery of therapeutics.
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Sistemas de Liberação de Medicamentos , Nanocápsulas/química , Nanoestruturas/química , Água/química , Composição de Medicamentos , Liberação Controlada de Fármacos , Humanos , Interações Hidrofóbicas e HidrofílicasRESUMO
Implementing ω-3 polyunsaturated fatty acids (ω-3 PUFA), naturally found in echium oil (EO), can highly improve the nutritional value of fortified foods. However, PUFA is prone to oxidation. In this study, the role of nanostructured lipid carriers incorporated into whey protein isolate (WPI)-stabilized EO droplets in oil-in-water emulsions was analyzed. Lipid carriers such as lauric (LA), palmitic (PA), and stearic (SA) acids were used. The results reveal that lipid carriers, especially LA, improve the physical stability of these droplets by decreasing their particle size by decreasing the number of surface pores; shown by SEM images and XRD data. Rheological data further show that the emulsions incorporated with LA had higher viscosity and there was also a crossover shift to lower strains in the G'-Gâ³ curve of the emulsions incorporating LA. TBARS assay indicated that LA was more effective in protecting EO against oxidation than both palmitic and stearic acids.
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Echium/química , Emulsões/química , Lipídeos/química , Nanoestruturas/química , Óleos de Plantas/química , Ácidos Láuricos/química , Microscopia Eletrônica de Varredura , Oxirredução , Ácido Palmítico/química , Tamanho da Partícula , Reologia , Ácidos Esteáricos/química , Termogravimetria , Viscosidade , Água/química , Proteínas do Soro do Leite/química , Difração de Raios XRESUMO
Microfluidic-based cell encapsulation has promising potential in therapeutic applications. It also provides a unique approach for studying cellular dynamics and interactions, though this concept has not yet been fully explored. No in vitro model currently exists that allows us to study the interaction between crypt cells and Peyer's patch immune cells because of the difficulty in recreating, with sufficient control, the two different microenvironments in the intestine in which these cell types belong. However, we demonstrate that a microfluidic technique is able to provide such precise control and that these cells can proliferate inside microgels. Current microfluidic-based cell microencapsulation techniques primarily use fluorinated oils. Herein, we study the feasibility and biocompatibility of different nonfluorinated oils for application in gastrointestinal cell encapsulation and further introduce a model for studying intercellular chemical interactions with this approach. Our results demonstrate that cell viability is more affected by the solidification and purification processes that occur after droplet formation rather than the oil type used for the carrier phase. Specifically, a shorter polymer cross-linking time and consequently lower cell exposure to the harsh environment (e.g., acidic pH) results in a high cell viability of over 90% within the protected microgels. Using nonfluorinated oils, we propose a model system demonstrating the interplay between crypt and Peyer's patch cells using this microfluidic approach to separately encapsulate the cells inside distinct alginate/gelatin microgels, which allow for intercellular chemical communication. We observed that the coculture of crypt cells alongside Peyer's patch immune cells improves the growth of healthy organoids inside these microgels, which contain both differentiated and undifferentiated cells over 21 days of coculture. These results indicate the possibility of using droplet-based microfluidics for culturing organoids to expand their applicability in clinical research.