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1.
Mol Pharm ; 19(2): 532-546, 2022 02 07.
Artigo em Inglês | MEDLINE | ID: mdl-34958588

RESUMO

The present study systematically investigates the effect of annealing conditions and the Kolliphor P 407 content on the physicochemical and structural properties of Compritol (glyceryl behenate) and ternary systems prepared via melt cooling (Kolliphor P 407, Compritol, and a hydrophilic API) representing solid-lipid formulations. The physical properties of Compritol and the ternary systems with varying ratios of Compritol and Kolliphor P 407 were characterized using differential scanning calorimetry (DSC), small- and wide-angle X-ray scattering (SWAXS) and infrared (IR) spectroscopy, and hot-stage microscopy (HSM), before and after annealing. The change in the chemical profiles of different Compritol components as a function of annealing was evaluated using 1H NMR spectroscopy. While no change in the polymorphic form of API and Kolliphor P 407 occurred during annealing, a systematic conversion of the α- to ß-form was observed in the case of Compritol. Furthermore, the polymorphic transformation of Compritol was found to be dependent on the Kolliphor P 407 content. As per the Flory-Huggins mixing theory, higher miscibility was observed in the case of monobehenin-Kolliphor P 407, monobehenin-dibehenin, and dibehenin-tribehenin binary mixtures. The miscibility of Kolliphor P 407 with monobehenin and 1,2-dibehenin was confirmed by 1H NMR analysis. The observed higher miscibility of Kolliphor P 407 with monobehenin and 1,2-dibehenin is proposed as the trigger for the physical separation from the 1,3-diglyceride and triglycerides during melt solidification of the formulations. The phase separation is postulated as the mechanism underlying the formation of a stable ß-polymorphic form (a native form of 1,3-diglyceride) of Compritol upon annealing. This finding is expected to have an important implication for developing stable solid-lipid-surfactant-based drug formulations.


Assuntos
Excipientes , Tensoativos , Varredura Diferencial de Calorimetria , Composição de Medicamentos , Excipientes/química , Transição de Fase , Solubilidade , Tensoativos/química
2.
Acta Med Acad ; 51(1): 21-28, 2022 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-35695399

RESUMO

OBJECTIVE: The purpose of this research was to investigate the correlation between serum levels of surfactant protein-D (SPD) with acute respiratory distress syndrome (ARDS) severity and mortality in COVID-19. MATERIALS AND METHOD: This was a prospective cohort research study that included 76 patients in the period from July to October 2020. SP-D serum levels were taken upon admission to the hospital, the diagnosis of ARDS and its grade were confirmed according to the WHO criteria, and then patients were observed for 28-day mortality. RESULTS: The mean SP-D serum levels from 76 patients were 39.33 ng/ml (SD±31.884 ng/ml). The statistical analysis showed that there was a significant correlation between SP-D serum levels and the severity of ARDS upon admission to the hospital (P=0.04, Spearman's rank correlation coefficient (rs)=0.26), but the correlation between serum levels of SP-D and mortality was not statistically significant (P=0.89; rs=-0.016). CONCLUSION: SP-D serum levels had a significant but weak correlation with ARDS severity, but were not significant for mortality.


Assuntos
COVID-19 , Síndrome do Desconforto Respiratório , Humanos , Indonésia/epidemiologia , Estudos Prospectivos , Proteína D Associada a Surfactante Pulmonar , Tensoativos
3.
Nat Commun ; 13(1): 3227, 2022 Jun 09.
Artigo em Inglês | MEDLINE | ID: mdl-35680913

RESUMO

Stable interfaces between immiscible solvents are crucial for chemical synthesis and assembly, but interfaces between miscible solvents have been less explored. Here the authors report the spontaneous water-on-water spreading and self-assembly of polyelectrolyte membranes. An aqueous mixture solution containing poly(ethyleneimine) and poly(sodium 4-styrenesulfonate) spreads efficiently on acidic water, leading to the formation of hierarchically porous membranes. The reduced surface tension of the polyelectrolyte mixture solution drives the surface spreading, while the interfacial polyelectrolytes complexation triggered by the low pH of water mitigates water-in-water mixing. The synergy of surface tension and pH-dependent complexation represents a generic mechanism governing interfaces between miscible solvents for materials engineering, without the need for surfactants or sophisticated equipment. As a proof-of-concept, porous polyelectrolyte hybrid membranes are prepared by surface spreading, exhibiting exceptional solar thermal evaporation performance (2.8 kg/m2h) under 1-sun irradiation.


Assuntos
Tensoativos , Água , Polieletrólitos , Solventes , Tensão Superficial
4.
Int J Mol Sci ; 23(11)2022 May 24.
Artigo em Inglês | MEDLINE | ID: mdl-35682557

RESUMO

The surfactant protein-G (SP-G) has recently been discovered in the brain and linked to fluid balance regulations. Stroke is characterized by impaired vessel integrity, promoting water influx and edema formation. The neurovascular unit concept (NVU) has been generated to cover not only ischemic affections of neurons or vessels but also other regionally associated cells. This study provides the first spatio-temporal characterization of SP-G and NVU elements after experimental stroke. Immunofluorescence labeling was applied to explore SP-G, vascular and cellular markers in mice (4, 24, and 72 h of ischemia), rats (24 h of ischemia), and sheep (two weeks of ischemia). Extravasated albumin indicated vascular damage within ischemic areas. Quantifications revealed decreasing SP-G signals in the ischemia-affected neocortex and subcortex. Inverse immunosignals of SP-G and vascular elements existed throughout all models. Despite local associations between SP-G and the vasculature, a definite co-localization was not seen. Along with a decreased SP-G-immunoreactivity in ischemic areas, signals originating from neurons, glial elements, and the extracellular matrix exhibited morphological alterations or changed intensities. Collectively, this study revealed regional alterations of SP-G, vascular, and non-vascular NVU elements after ischemia, and may thus stimulate the discussion about the role of SP-G during stroke.


Assuntos
Isquemia Encefálica , Neocórtex , Acidente Vascular Cerebral , Animais , Infarto Cerebral , Camundongos , Ratos , Ovinos , Tensoativos
5.
Int J Chron Obstruct Pulmon Dis ; 17: 1247-1260, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35651829

RESUMO

Background: Secretoglobin (SCGB) 3A2 is a novel bioactive molecule with anti-inflammatory and anti-fibrotic activities. SCGB3A2 also promotes the maturation of bronchial divergence and the lungs during embryonic development. However, much remains unknown concerning the roles of SCGB3A2 in diseases associated with aging. Methods: The lungs of Scgb3a2-knockout (KO) mice and their wild-type (WT) littermates were subjected to histological analysis, Victoria blue staining to evaluate of elastic fibers, and lung morphometric analysis during the postnatal period (birth to 8 weeks) and during aging (8 weeks to 2 years). Their spleens were also histologically evaluated. The expression of lung surfactant protein (SP) mRNAs was examined by quantitative reverse transcriptase-polymerase chain reaction. RNA sequencing (RNAseq) analysis was performed on 3-month-old KO and WT mouse lungs. Results: The alveolar spaces of KO mice continuously expanded between 0.5 and 2 years of age, accompanied by increases of the mean linear intercept and destructive index. KO mouse lungs displayed inflammation associated with lymphocyte aggregate starting at 1 year of age, and the inflammation was worse than that of WT mouse lungs. A high number of lymphoma-like cells were presented in 2-year-old KO mouse lungs. White pulp fusion was detected in the spleens of both WT and KO mice older than 0.5 years; however, the fusion was more severe in KO mice than in WT mice. The expression of surfactant protein (SP)-A, SP-B, SP-C, and SP-D mRNAs in KO mouse lungs decreased with age, and after 1 year of age, the expression of most SPs was significantly lower in KO mice than in WT mice. RNAseq demonstrated that the expression of immune system-related genes was highly altered in KO mouse lungs. Conclusion: SCGB3A2 may be required for maintaining homeostasis and immune activity in the lungs during aging. SCGB3A2 deficiency might increase the risk of emphysema of the lung.


Assuntos
Enfisema , Linfoma , Doença Pulmonar Obstrutiva Crônica , Envelhecimento , Animais , Feminino , Humanos , Inflamação/metabolismo , Pulmão/metabolismo , Linfoma/metabolismo , Linfoma/patologia , Camundongos , Camundongos Knockout , Gravidez , Doença Pulmonar Obstrutiva Crônica/metabolismo , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Secretoglobinas/genética , Secretoglobinas/metabolismo , Tensoativos/metabolismo
6.
J Phys Chem Lett ; 13(22): 5081-5087, 2022 Jun 09.
Artigo em Inglês | MEDLINE | ID: mdl-35653184

RESUMO

Anions play significant roles in the separation of lanthanides and actinides. The molecular-scale details of how these anions behave at aqueous interfaces are not well understood, especially at high ionic strengths. Here, we describe the interfacial structure of thiocyanate anions at a soft charged interface up to 5 M bulk concentration with combined classical and phase-sensitive vibrational sum frequency generation (PS-VSFG) spectroscopy and molecular dynamics (MD) simulations. At low concentrations thiocyanate ions are mostly oriented with their sulfur end pointing toward the charged surfactants. The VSFG signal reaches a plateau at around 100 mM bulk concentration, followed by significant changes above 1 M. At high concentrations a new thiocyanate population emerges with their sulfur end pointing toward the bulk liquid. The -CN stretch frequency is different for up and down oriented SCN- ions, indicating different coordination environments. These results provide key molecular-level insights for the interfacial behavior of complex anions in highly concentrated solutions.


Assuntos
Tensoativos , Tiocianatos , Ânions , Eletrólitos , Íons/química , Enxofre , Tensoativos/química , Tiocianatos/química
7.
Ecotoxicol Environ Saf ; 240: 113696, 2022 Jul 15.
Artigo em Inglês | MEDLINE | ID: mdl-35653969

RESUMO

Demulsification and crude oil desorption are usually a necessary step for the treatment of oily sludge in the petroleum industry. In this study a binary mixed bio-surfactant (rhamnolipid / sophorolipid, RL/SL) was used to strengthen the removing oil efficiency for oily sludge by thermal washing method. Surface tension values of the single and the mixed surfactants were carried out to investigate the effect of mixing systems on reducing critical micelle concentrations (CMC) value. The models proposed by Clint, Rubingh and Gibbs et al. had been employed to interpret the formation of mixed micelles and synergism and found out in case of the mass ratios of 4:6 the synergism was the strongest in RL and SL mixed surfactant systems, which was selected as the washing agents to treat the oily sludge produced from Huabei oilfield. Through the optimization of oil washing process parameters, the oil removal rate reached the maximum value (95.66%, residual oil rate 1.98%) at the condition of heating temperature of 45 °C, detergents concentration of 500 mg/L, washing time of 3 h, liquid/solid mass ratio of 1:4, stirring speed of 300 r/min, and washing 4 times. The factors affecting the oil washing effect were analyzed from the composition and performance characteristics of oily sludge samples, washing oil system and washing process parameters. The results showed that low oil content of oily sludge, small specific surface area, strong wetting and solubilization of the oil-washing system all can increase the oil-washing effect and the washing time and temperature had a great influence on the oil-washing effect. Compared with the results of other researchers, the oil washing temperature and the concentration of oil washing agent were significantly lower and high oil removal rate and low residual oil rate were obtained in this study. It was confirmed that thermal oil washing method using RT/SL binary bio-surfactant mixing system was proved to a high-efficiency, low-consumption and wide range of applications technology.


Assuntos
Petróleo , Surfactantes Pulmonares , Glicolipídeos , Micelas , Óleos , Ácidos Oleicos , Petróleo/análise , Esgotos , Tensoativos
8.
Langmuir ; 38(24): 7535-7544, 2022 Jun 21.
Artigo em Inglês | MEDLINE | ID: mdl-35666568

RESUMO

Sugar-based amphiphiles are a relevant natural alternative to synthetic ones due to their biodegradable properties. An understanding of their structure-assembly relationship is needed to allow the concrete synthesis of suitable derivatives. Here, four different mannose-derivative surfactants are characterized by pendant drop, dynamic light scattering, small-angle X-ray scattering, cryotransmission electron microscopy, and molecular dynamics techniques in aqueous media. Measurements denote how the polysaccharide average degree of polymerization (DP¯) and the addition of a hydroxyl group to the hydrophobic tail, and thus the presence of a second hydrophilic moiety, affect their self-assembly. A variation in the DP¯ of the amphiphile has no effect in the critical micelle concentration in contrast to a change in the hydrophobic molecular region. Moreover, high-DP¯ amphiphiles self-assemble into spherical micelles irrespective of the hydroxyl group presence. Low-DP¯ amphiphiles with only one hydrophilic moiety form cylindrical micelles, while the addition of a hydroxyl group to the tail leads to a spherical shape.


Assuntos
Micelas , Açúcares , Carboidratos , Interações Hidrofóbicas e Hidrofílicas , Tensoativos/química
9.
Langmuir ; 38(24): 7413-7421, 2022 Jun 21.
Artigo em Inglês | MEDLINE | ID: mdl-35671271

RESUMO

Aside from its prominent role in the excretory system, urea is also a known protein denaturant. Here, we characterize urea as it behaves in confined spaces of AOT (sodium bis(2-ethylhexyl) sulfosuccinate) reverse micelles as a model of tight, confined spaces found at the subcellular level. Dynamic light scattering revealed that low temperatures (275 K) caused the smallest of the reverse micelle sizes, w0 = 10, to destabilize and dramatically increase in apparent hydrodynamic diameter. We attribute this to urea embedded into the surfactant interface as confirmed by 2D 1H-NOESY NMR spectroscopy. This increase in size in turn caused the hydrogen exchange between urea and water within the nanosized reverse micelles to increase as measured by 1D EXSY-NMR. A minimal enlarging effect and no increase in hydrogen exchange were observed when aqueous urea was introduced into w0 = 15 or 20 reverse micelles, suggesting that this effect is unique to particularly small-diameter spaces (∼7 nm).


Assuntos
Micelas , Ureia , Hidrogênio , Tensoativos/química , Temperatura , Água/química
10.
Anal Chem ; 94(24): 8668-8673, 2022 Jun 21.
Artigo em Inglês | MEDLINE | ID: mdl-35675206

RESUMO

Nanoparticle hydrophobicity is a key factor controlling the stability, adhesion, and transport of nanoparticle suspensions. Although a number of approaches have been presented for evaluating nanoparticle hydrophobicity, these methods are difficult to apply to larger nanoparticles and viruses (>100 nm in size) that are of increasing importance in drug delivery and gene therapy. This study investigated the use of a new analytical hydrophobic interaction chromatography method employing a 5.0 µm pore size polyvinylidene fluoride membrane as the stationary-phase in membrane hydrophobic interaction chromatography (MHIC). Experimental data obtained using a series of model proteins were in good agreement with literature values for the hydrophobicity (both experimental and computational). MHIC was then used to evaluate the hydrophobicity of a variety of nanoparticles, including a live attenuated viral vaccine, both in water and in the presence of different surfactants. This new method can be implemented on any liquid chromatography system, run times are typically <20 min, and the experiments avoid the use of organic solvents that could alter the structure of many biological nanoparticles.


Assuntos
Nanopartículas , Cromatografia Líquida/métodos , Interações Hidrofóbicas e Hidrofílicas , Nanopartículas/química , Solventes/química , Tensoativos/química
11.
Langmuir ; 38(24): 7484-7495, 2022 Jun 21.
Artigo em Inglês | MEDLINE | ID: mdl-35675508

RESUMO

The gemini surfactant PyO-3-12, made of two dimethylammonium bromides joined by a propyl linker and bearing a dodecyl pendant on one side and a 1-pyrenemethoxyhexyl group on the other side, was employed to probe the interactions between positively charged PyO-3-12 and negatively charged sodium dodecyl sulfate (SDS). PyO-3-12 was selected for its ability to respond to the polarity of its local environment through the fluorescence intensity ratio I1/I3 of the first-to-third fluorescence peaks of the pyrene monomer and the local pyrene concentration [Py]loc through the IE/IM ratio of the pyrene excimer-to-pyrene monomer fluorescence intensity. Furthermore, analysis of the fluorescence decays of aqueous solutions of PyO-3-12 and SDS yielded a measure of the internal dynamics, local concentration, and state (associated vs unassociated) of PyO-3-12 in solution. By following these parameters for aqueous solutions prepared with a constant PyO-3-12 concentration of either 1, 4, or 16 µM and SDS concentrations ranging from 0 to 200 mM, six SDS concentration regimes were identified to describe the interactions between PyO-3-12 and SDS in pure water. Sharp transitions of the parameters describing the fluorescence of pyrene marked the boundaries between the different regimes. Perhaps the most important transition was the one defining the formation of the PyO-3-12/SDS aggregates, which was completed at the equicharge point, implying that they were constituted of 1 meq of PyO-3-12 and 2 meq of SDS. The low I1/I3 ratio obtained for the PyO-3-12/SDS aggregates suggested that they were multilamellar aggregates, which would shield the pyrenyl labels from polar water. The formation of these multilamellar aggregates was confirmed by transmission electron microscopy (TEM), which demonstrated the existence of multilamellar vesicles, whose presence increased with decreasing PyO-3-12 concentration. This study suggests that the combination of pyrene excimer formation and TEM provides an interesting experimental means to probe the assemblies generated from oppositely charged surfactants at surfactant concentrations, which are much lower than their critical micelle concentration.


Assuntos
Pirenos , Tensoativos , Micelas , Dodecilsulfato de Sódio , Água
12.
Anal Chem ; 94(24): 8625-8632, 2022 Jun 21.
Artigo em Inglês | MEDLINE | ID: mdl-35679579

RESUMO

Polysorbates are nonionic surfactants that have been widely used in biotherapeutic formulations to prevent protein aggregation and denaturation. However, polysorbates are subject to degradation after prolonged storage if certain lipases are present in the biotherapeutic product. Because the degradation of polysorbates compromises the shelf life of biotherapeutics and leads to the formation of undesirable products such as protein aggregates and subvisible particles, it is important to identify the active enzymes that catalyze polysorbate hydrolysis. In this study, we developed a novel fluorophosphonate activity-based protein profiling (ABPP) probe (termed the REGN probe), which mimics the structure of polysorbate and targets lipases catalyzing polysorbate degradation. We demonstrated that the REGN probe could enrich certain lipases from Chinese hamster ovary (CHO) cell lysate by more than 100-fold compared with direct tryptic digestion. Furthermore, we found that the REGN probe had higher lipase enrichment efficiency than commercially available ABPP probes including fluorophosphonate-biotin (FP-biotin) and FP-desthiobiotin. Remarkably, the REGN probe can enrich several lipases that cannot be labeled by commercial probes, such as lysosomal acid lipase and cytosolic phospholipase A2. Additionally, we showed that lipases with abundances as low as 0.08 ppm in drug substances were detected by the REGN probe enrichment and liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis. Collectively, we have developed a novel ABPP probe with higher enrichment efficiency and broader coverage for lipases compared with commercial probes, and this probe can be used to detect the trace level of lipases in biotherapeutic products and to facilitate their development and manufacturing.


Assuntos
Polissorbatos , Espectrometria de Massas em Tandem , Animais , Células CHO , Cromatografia Líquida , Cricetinae , Cricetulus , Lipase , Polissorbatos/química , Tensoativos/química
13.
J Vis Exp ; (184)2022 Jun 03.
Artigo em Inglês | MEDLINE | ID: mdl-35723476

RESUMO

Biosurfactants are surface-active compounds capable of reducing the surface tension between two phases of different polarities. Biosurfactants have been emerging as promising alternatives to chemical surfactants due to less toxicity, high biodegradability, environmental compatibility and tolerance to extreme environmental conditions. Here, we illustrate the methods used for screening of microbes capable of producing biosurfactants. The biosurfactant producing microbes were identified using drop collapse, oil spreading, and emulsion index assays. Biosurfactant production was validated by determining the reduction in surface tension of the media due to growth of the microbial members. We also describe the methods involved in characterization and identification of biosurfactants. Thin layer chromatography of the extracted biosurfactant followed by differential staining of the plates was performed to determine the nature of the biosurfactant. LCMS, 1H NMR, and FT-IR were used to chemically identify the biosurfactant. We further illustrate the methods to evaluate the application of the combination of produced biosurfactants for enhancing residual oil recovery in a simulated sand pack column.


Assuntos
Tensoativos , Emulsões/química , Espectroscopia de Infravermelho com Transformada de Fourier , Tensão Superficial , Tensoativos/química
14.
Carbohydr Polym ; 292: 119642, 2022 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-35725155

RESUMO

Interaction of binary chitosan/nonionic surfactant (NIS) system with sodium dodecyl sulfate (SDS) in aqueous solution is described using turbodimetry, light scattering, electophoretic mobility and cryogenic electron microscopy. The formation of insoluble CHI/SDS complexes is weakened with a decrease in molecular weight of chitosan and critical micelle concentration of NIS as well as with an increase in NIS concentration. Soluble chitosan/NIS complexes absorb SDS molecules until the charge of mixed chitosan/NIS/SDS complexes reaches a critical value that depends on chitosan molecular weight followed by aggregation of primary electrostatic complexes via hydrogen bonding to complex nanoparticles. In contrast to formation of asymmetric swarm-like structures in the binary chitosan/SDS system, the aggregation of complex nanoparticles in the ternary chitosan/NIS/SDS system occurs by a head-to-tail binding mechanism with formation of elongated filamentous microstructures. The finding can be promising for preparation of microbiologically stable pharmaceutical and cosmetic compositions and drug delivery systems containing mixed surfactants.


Assuntos
Quitosana , Quitosana/química , Micelas , Dodecilsulfato de Sódio/química , Tensoativos/química
15.
World J Microbiol Biotechnol ; 38(8): 141, 2022 Jun 17.
Artigo em Inglês | MEDLINE | ID: mdl-35710855

RESUMO

Mineral lubricating oils are widely used in various industrial sectors for their applications in maintenance and functioning of machineries. However, indiscriminate dumping of these used oils have resulted in polluting the natural reservoirs which subsequently destroys ecological balance. Bacteria can emulsify or lower surface tension between phases of immiscible substrates and can acquire them as their carbon and energy sources. Such a phenomenon is mediated by production of extracellular polymers which can function as eminent surface active compounds based on their surfactant or emulsifying nature. The comparison between bacterial strains (Gram-positive Bacillus stratosphericus A15 and Gram-negative Ochrobactrum pseudintermedium C1) on utilization of pure straight chain hydrocarbons, waste mineral lubricating oils as sole carbon source and chemical characterization of the synthesized surface active compounds were studied. Characterization analysis by Ultraviolet Visible spectrophotometry, Fourier transform infrared spectroscopy, Nuclear Magnetic Resonance spectroscopy, Carbon-Hydrogen-Nitrogen analysis has given detailed structural elucidation of surface active compounds. The contrasting nature of bacterial strains in utilization of different hydrocarbons of waste mineral lubricating oils was observed in Gas Chromatography-Mass Spectroscopy analysis. The variation between both strains in utilization of hydrocarbons can be manifested in chemical structural differences and properties of the produced surface active compounds. Scanning Electron Microscopy has given detailed insight into the microstructural difference of the compounds. The utilization of lubricating oils can address waste disposal problem and offer an economical feasible approach for bacterial production of surface active compounds. Our results suggest that these surface active compounds can maneuver applications in environmental bioremediation and agriculture, pharmaceuticals and food as functional biomaterials.


Assuntos
Bacillus , Ochrobactrum , Biodegradação Ambiental , Carbono , Hidrocarbonetos , Minerais , Óleos Vegetais , Tensoativos
16.
Front Immunol ; 13: 842745, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35720392

RESUMO

Surfactant proteins (SPs) are important for normal lung function and innate immunity of the lungs and their genes have been identified with significant genetic variability. Changes in quantity or quality of SPs due to genetic mutations or natural genetic variability may alter their functions and contribute to the host susceptibility for particular diseases. Alternatively, SP single nucleotide polymorphisms (SNPs) can serve as markers to identify disease risk or response to therapies, as shown for other genes in a number of other studies. In the current study, we evaluated associations of SFTP SNPs with idiopathic pulmonary fibrosis (IPF) by studying novel computational models where the epistatic effects (dominant, additive, recessive) of SNP-SNP interactions could be evaluated, and then compared the results with a previously published hypersensitivity pneumonitis (HP) study where the same novel models were used. Mexican Hispanic patients (IPF=84 & HP=75) and 194 healthy control individuals were evaluated. The goal was to identify SP SNPs and SNP-SNP interactions that associate with IPF as well as SNPs and interactions that may be unique to each of these interstitial diseases or common between them. We observed: 1) in terms of IPF, i) three single SFTPA1 SNPs to associate with decreased IPF risk, ii) three SFTPA1 haplotypes to associate with increased IPF risk, and iii) a number of three-SNP interactions to associate with IPF susceptibility. 2) Comparison of IPF and HP, i) three SFTPA1 and one SFTPB SNP associated with decreased risk in IPF but increased risk in HP, and one SFTPA1 SNP associated with decreased risk in both IPF and HP, ii) a number of three-SNP interactions with the same or different effect pattern associated with IPF and/or HP susceptibility, iii) one of the three-SNP interactions that involved SNPs of SFTPA1, SFTPA2, and SFTPD, with the same effect pattern, was associated with a disease-specific outcome, a decreased and increased risk in HP and IPF, respectively. This is the first study that compares the SP gene variants in these two phenotypically similar diseases. Our findings indicate that SNPs of all SFTPs may play an important role in the genetic susceptibility to IPF and HP. Importantly, IPF and HP share some SP genetic variants, suggesting common pathophysiological mechanisms and pathways regarding surfactant biogenesis, but also some differences, highlighting the diverse underlying pathogenic mechanisms between an inflammatory-driven fibrosis (HP) and an epithelial-driven fibrosis (IPF). Alternatively, the significant SNPs identified here, along with SNPs of other genes, could serve as markers to distinguish these two devastating diseases.


Assuntos
Alveolite Alérgica Extrínseca , Fibrose Pulmonar Idiopática , Surfactantes Pulmonares , Alveolite Alérgica Extrínseca/genética , Fibrose , Humanos , Fibrose Pulmonar Idiopática/genética , Polimorfismo de Nucleotídeo Único , Tensoativos
17.
Mar Pollut Bull ; 180: 113817, 2022 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-35691182

RESUMO

This paper presents a tightly coupled experimental and kinetic approach for efficient remediation of oil spill from contaminated marine intertidal zone surface through a methodical strategy that deals with biosurfactant mediated washing strategy. The study deals with production, optimization and characterization of lipopeptide biosurfactant from Bacillus subtilis T1 and its application in remediation of oil contaminants from mimic model system of various marine intertidal zone i.e. woodland-Group1, saltmarsh-Group2, mangrove-Group3 and mudflats-Group4. Results demonstrates enhanced washing performance with oil desorption rate of 35 % in Group 4, 17.22 %, 15.6 % and 11 % in Group 3, 2 and 1 along with bio surfactant recovery rate of 41 %, 48.7 %, 51.71 % and 50.3 % respectively. Further, the washing strategy was efficient in soil detoxification with highest rate in Group 4. The kinetic validation depicts good match among experimental data and Lagergren pseudo second order data.


Assuntos
Poluição por Petróleo , Poluentes do Solo , Biodegradação Ambiental , Lipopeptídeos/química , Solo/química , Poluentes do Solo/análise , Tensoativos/química
18.
Artigo em Inglês | MEDLINE | ID: mdl-35696982

RESUMO

A ternary solvent system-based air-assisted liquid-liquid microextraction procedure was developed for the extraction of three surfactants from exhaled breath condensate samples prior to their determination by high performance liquid chromatography-tandem mass spectrometry. In this approach, different deep eutectic solvents were synthesized based on phosphocholine chloride and fatty acids and their mixtures were used as the extraction solvents to effective extraction of the analytes. To obtain the optimum composition of the extraction solvents, a simplex centroid design approach was used. Then the effective parameters were studied by response surface methodology using central composite design. The obtained data after optimization showed that 6 times was the best extraction time for the developed procedure. When the sample solution pH was adjusted at 3.7, the method reached to higher extraction efficiency which can be related to the fact that the analytes were in the protonated forms. Increasing the sample solution temperature up to 50 °C enhanced the migration rate of the analytes into the extraction solvent and the method efficacy was increased. Also addition of sodium chloride at 2.8% (w/v) had a positive effect on the method efficiency which can be related to decreasing the analytes solubility in the sample solution. Under optimal conditions, the method showed satisfactory coefficient of determination (≥0.9979), low limit of detection (0.12-0.23 ng mL-1) and quantification (0.39-0.76 ng mL-1), acceptable repeatability in deionized water (relative standard deviation ≤ 8.2%) and in exhaled breath condensate (relative standard deviation ≤ 7.2%), and acceptable extraction recovery (75-86%) and enrichment factor (71-86). Considering these results, the developed method provided a quick and efficient way to determine surfactants in the exhaled breath condensate collected from expiratory circuit of the mechanical ventilator. It can be used in drug monitoring and clinical studies.


Assuntos
Microextração em Fase Líquida , Cromatografia Líquida de Alta Pressão/métodos , Limite de Detecção , Microextração em Fase Líquida/métodos , Solventes/química , Tensoativos , Espectrometria de Massas em Tandem/métodos
19.
Enzyme Microb Technol ; 159: 110068, 2022 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-35660853

RESUMO

The apparent solubility and bioavailability of hydrophobic compounds, the main problems in the bioremediation process, can be overcome by bacteria producing biosurfactants. Lipopeptide biosurfactants, as high-efficiency biosurfactants with biological activity, can be synthesized by nonribosomal peptide synthetase (NRPS). In this study, two strains, Paenibacillus lautus A (HC_A) and Lysinibacillus fusiformis B (HC_B), which can efficiently produce lipopeptide biosurfactants, were screened. The NRPS gene sequences of these two strains were obtained by whole-genome sequencing. The module of synthetic surfactant NRPS from HC_A and the module of synthetic surfactants NRPS and sfp from HC_B were successfully cloned into plasmids and then expressed in E. coli (namely, E. coli pHC_A-NRPS and E. coli pHC_B-NRPS-sfp, respectively). Finally, stable lipopeptide biosurfactants could be expressed heterologously. Our research shows that the constructed recombinant bacteria E. coli pHC_A-NRPS and E. coli pHC_B-NRPS-sfp can heterologously express the NRPS module (graphical abstract is shown in Fig 1). Remarkably, the lipopeptide biosurfactants produced by the constructed recombinant bacteria of the NRPS gene have good emulsifying activity on tributyrin. Meanwhile, adding SiO2 nanoparticles and surface-modified carbon black can synergistically enhance the emulsifying effect, which has not been reported before. This research may deepen the comprehension of microbial strains that produce surfactants to emulsify environmental pollutants and perform bioremediation.


Assuntos
Escherichia coli , Lipopeptídeos , Escherichia coli/genética , Lipopeptídeos/química , Peptídeo Sintases , Dióxido de Silício , Tensoativos/química
20.
Phys Chem Chem Phys ; 24(23): 14538-14544, 2022 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-35666107

RESUMO

The self-assembly of inorganic structures beyond the euhedral shape repertoire is a powerful approach to grow hierarchically ordered materials and mesoscopic devices. The hollow precipitate tubes in chemical gardens are a classic example, which we produce on Nafion membranes separating a CaCl2-containing gel from a Na2CO3 solution. The resulting CaCO3 microtubes are conical and consist of either pure vaterite or calcite. The process also forms branched T- and Y-shaped structures. The metastable vaterite polymorph can be converted to Mn-based structures without loss of the macroscopic shape. In H2O2 solution, the resulting tubes self-propel by the release of O2 bubbles, which for branched structures causes rotation. The tubes can contain multiple bubbles which are ejected in a quasi-periodic fashion (e.g. in groups of four). The addition of surfactants causes the accumulation of bubble trails and bubble rafts that interact with the moving tubes and give rise to distinct motion patterns.


Assuntos
Carbonato de Cálcio , Peróxido de Hidrogênio , Carbonato de Cálcio/química , Tensoativos
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