Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 16 de 16
Filtrar
1.
Int Wound J ; 20(10): 3981-3989, 2023 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-37434335

RESUMO

A meta-analysis was implemented to appraise the effect of hydrocolloid dressings (HCDs) in the management of different grades of pressure wound ulcers (PWUs) in critically ill adult subjects (CIUSs). Inclusive literature research until April 2023 was done, and 969 interconnected researches were revised. The 8 picked researches, enclosed 679 critically ill adult persons at the utilized researchers' starting point; 355 of them were utilizing HCDs, and 324 were controls. Odds ratio (OR) and 95% confidence intervals (CIs) were utilized to appraise the consequences of HCDs in treating CIUSs by the dichotomous approach and a fixed or random model. HCDs had significantly higher PWU complete healing (OR, 2.15; 95% CI, 1.54-3.02, p < 0.001), PWU stage II ulcers complete healing (OR, 2.82; 95% CI, 1.40-5.69, p = 0.004), and PWU stage III ulcers complete healing (OR, 3.73; 95% CI, 1.23-11.35, p = 0.02) compared to control in critically ill adult persons. HCDs had significantly higher PWU complete healing, PWU stage II ulcers complete healing, and PWU stage III ulcers complete healing compared with control in critically ill adult persons. However, caution needs to be taken when interacting with its values since there was a low sample size of most of the chosen research found for the comparisons in the meta-analysis.


Assuntos
Úlcera por Pressão , Adulto , Humanos , Curativos Hidrocoloides , Estado Terminal/terapia , Úlcera por Pressão/terapia
2.
Int Wound J ; 20(8): 3307-3314, 2023 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-37161646

RESUMO

A meta-analysis investigation was executed to measure the outcome of adjunctive prophylactic macrolides (APM) used at caesarean section (CS) on endometritis and surgical site wound infection (SSWI). A comprehensive literature inspection till February 2023 was applied and 1023 interrelated investigations were reviewed. The 10 chosen investigations enclosed 22 676 females with CS were in the chosen investigations' starting point, 14 034 of them were utilising APM, and 8642 were utilising control. Odds ratio (OR) in addition to 95% confidence intervals (CIs) were used to compute the value of the effect of APM used at CS on endometritis and SSWI by the dichotomous approaches and a fixed or random model. Adjunctive prophylactic macrolides had significantly lower SSWI (OR, 0.43; 95% CI, 0.34-0.55, P < .001), and endometritis (OR, 0.34; 95% CI, 0.20-0.60, P = .005) compared with those with control in females with CS. Adjunctive prophylactic macrolides had significantly lower SSWI, and endometritis compared with those with control in females with CS. However, care must be exercised when dealing with its values because of the low number of nominated investigations for the meta-analysis.


Assuntos
Cesárea , Endometrite , Humanos , Feminino , Gravidez , Cesárea/efeitos adversos , Endometrite/tratamento farmacológico , Endometrite/prevenção & controle , Macrolídeos/uso terapêutico , Infecção da Ferida Cirúrgica/tratamento farmacológico , Infecção da Ferida Cirúrgica/prevenção & controle , Antibacterianos/uso terapêutico
3.
Intractable Rare Dis Res ; 13(2): 117-120, 2024 May 31.
Artigo em Inglês | MEDLINE | ID: mdl-38836180

RESUMO

Capitalizing on breakthroughs in reproductive genetics, the utilization of in vitro embryo culture and stem cell technologies heralds a transformative era in addressing global challenges posed by rare genetic diseases. These cutting-edge practices illuminate the intricacies of early human development, elucidate the mechanisms behind rare diseases, and guide the development of potential therapies. Balancing this remarkable innovation with necessary ethical considerations, these technologies have the potential to revolutionize the trajectory of rare genetic disorders, transforming the landscape of diagnosis, treatment, and genetic counseling while offering renewed hope for affected individuals and families worldwide.

4.
Medicine (Baltimore) ; 102(30): e34472, 2023 Jul 28.
Artigo em Inglês | MEDLINE | ID: mdl-37505156

RESUMO

This retrospective study aims to identify the single nucleotide polymorphisms (SNPs) of 5,10-methylenetetrahydrofolate reductase (MTHFR) (C677T, A1298C), methionine synthase reductase (MTRR) (A66G) and ethnic distribution characteristics in pregnant women, and to explore the risk correlation with folate metabolism. The demographic data of 8735 pregnant women aged 15 to 47 years were retrospectively analyzed, and peripheral blood samples were collected and tested. Reverse transcription-quantitative polymerase chain reaction was applied to determine the genotype and allele frequency of MTHFR C677T, A1298C and MTRR A66G in blood samples. Sperman correlation analysis, univariate and multivariate logistic regression analysis were used to verify the correlation between SNPs of MTHFR (C677T, A1298C), MTRR (A66G), different ethnic groups and the susceptibility and risk levels of folate metabolism. The relative risk of the SNPs was further determined by calculating the odds ratio (OR) at a 95% confidence interval (CI). The average age of 8735 pregnant women was 28.87 ± 4.20 years old. The evaluation of risk levels for folate metabolism was relative high, including 2296 cases with low risk, 3971 cases with medium risk, and 752 cases with high risk. Among the MTHFR C677T locus, the CC genotype had the highest frequency, MTHFR A1298C locus had the highest frequency of the AA genotype, and MTRR A66G locus had the highest frequency of the AA genotype. The frequency distribution of SNPs in different ethnic groups revealed that the frequency of CT genotype among the MTHFR C677T locus, AA genotype among the MTHFR A1298C locus and the MTRR A66G locus was the highest in Han, Buyi, Miao and Dong ethnic groups. The results of logistic regression analysis showed that the Han, Buyi, Miao and other ethnic groups (including Yi, Bai, Zhuang, Chuanqing) had the possibility of increasing the risk levels of folate metabolism. The CC genotype of MTHFR C677T (adjusted OR = 2.46, 95% CI: 2.14-2.84, P < .001) and the AG genotype of MTRR A66G (adjusted OR = 1.89, 95% CI: 1.61-2.22, P < .001) were significantly related to the risk levels of folate metabolism, which is an independent risk factor for the susceptibility of folate metabolism.


Assuntos
Predisposição Genética para Doença , Polimorfismo de Nucleotídeo Único , Humanos , Feminino , Gravidez , Adulto Jovem , Adulto , Gestantes , Estudos Retrospectivos , Ácido Fólico , Genótipo , Metilenotetra-Hidrofolato Redutase (NADPH2)/genética , Ferredoxina-NADP Redutase/genética , Estudos de Casos e Controles
5.
PLoS One ; 18(8): e0276036, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37561778

RESUMO

After mating, female mosquitoes need a blood meal to promote the reproductive process. When mosquitoes bite infected people and animals, they become infected with germs such as viruses and parasites. Mosquitoes rely on many cues for host selection and localization, among which the trace chemical cues emitted by the host into the environment are considered to be the most important, and the sense of smell is the main way to perceive these trace chemical cues. However, the current understanding of the olfactory mechanism is not enough to meet the needs of mosquito control. Unlike previous studies that focused on the olfactory receptor recognition spectrum to reveal the olfactory mechanism of mosquito host localization. In this paper, based on the observation that mosquitoes with incomplete antennae still can locate the host and complete blood feeding in the laboratory, we proposed that there may be some protection or compensation mechanism in the 13 segments of antennae flagella, and only when the antennae are missing to a certain threshold will it affect the mosquito's ability to locate the host. Through rational-designed behavioral experiments, we found that the 6th and 7th flagellomeres on the Aedes albopictus antenna are important in the olfactory detection of host searching. This study preliminarily screened antennal segments important for host localization of Ae. albopictus, and provided a reference for subsequent cell biology and molecular biology studies on these segments. Meanwhile, the morphology and distribution of sensilla on each antenna flagellomere were also analyzed and discussed in this paper.


Assuntos
Aedes , Neurônios Receptores Olfatórios , Animais , Feminino , Aedes/anatomia & histologia , Comportamento de Sucção , Olfato , Comportamento Alimentar
6.
Shanghai Kou Qiang Yi Xue ; 32(4): 385-390, 2023 Aug.
Artigo em Zh | MEDLINE | ID: mdl-38044732

RESUMO

PURPOSE: To investigate the expression of tissue-active protein kinase C receptor 1 (RACK1) and epithelin glycoprotein 40 (EGP40) in oral squamous cell carcinoma (OSCC) and their relationship with clinicopathological features and prognosis. METHODS: A total of 103 patients with OSCC who were admitted to Shangrao People's Hospital from January 2016 to February 2019 were prospectively selected as the research subjects. All patients underwent radical resection of OSCC and were followed up for 3 years. Immunohistochemistry was used to detect the positive expression levels of RACK1 and EGP40 in cancer tissues and adjacent tissues. The positive expression of RACK1 and EGP40 in cancer tissues and adjacent tissues were compared. The relationship between the positive expression level of RACK1 and EGP40 in cancer tissues of OSCC patients and clinicopathological parameters was analyzed. Factors affecting postoperative recurrence and metastasis in OSCC patients were analyzed. The relationship between the expression of RACK1 and EGP40 in cancer tissues and postoperative disease-free survival of OSCC patients was analyzed. SPSS 18.0 software package was used for statistical analysis of the data. RESULTS: The positive expression rate of RACK1 and EGP40 in cancer tissues was significantly higher than those in adjacent tissues (P<0.05). The positive expression rate of RACK1 and EGP40 in cancer tissues of OSCC patients with poorly differentiated, stage III, cervical lymph node metastasis, and infiltrating vessels was significantly higher than that in patients with moderate and high differentiation, stage II, no cervical lymph node metastasis, and no infiltrating vessels(P<0.05). The positive expression rate of RACK1 in cancer tissue of OSCC patients in T3 stage was significantly higher than that in T2 stage(P<0.05). Cox multivariate regression analysis showed pathological grade (RR=6.290, 95%CI: 2.588-15.287), cervical lymph node metastasis(RR=5.995, 95%CI: 2.467-14.571), RACK1 positive rate (RR=4.495, 95%CI: 1.850-10.925) and EGP40 positive rate (RR=4.559, 95%CI: 1.876-11.079) were factors affecting the recurrence and metastasis of OSCC patients after surgery(P<0.05). The disease-free survival curve of patients with negative expression of RACK1 was significantly better than that of patients with positive expression (P<0.05). The disease-free survival curve of patients with negative expression of EGP40 was significantly better than that of patients with positive expression (P<0.05). CONCLUSIONS: The expression of RACK1 and EGP40 in cancer tissues of OSCC patients is related to clinicopathological parameters and prognosis. Patients with positive expression of RACK1 and EGP40 have a high risk of recurrence and metastasis after surgery.


Assuntos
Carcinoma de Células Escamosas , Neoplasias de Cabeça e Pescoço , Neoplasias Bucais , Humanos , Carcinoma de Células Escamosas/cirurgia , Carcinoma de Células Escamosas/patologia , Granulinas , Metástase Linfática , Neoplasias Bucais/cirurgia , Neoplasias Bucais/patologia , Proteínas de Neoplasias/metabolismo , Prognóstico , Receptores de Quinase C Ativada/metabolismo , Carcinoma de Células Escamosas de Cabeça e Pescoço
7.
Ann Palliat Med ; 11(1): 384-393, 2022 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-35144429

RESUMO

Placental increta can easily lead to secondary infections in the perinatal period. In severe cases, it can develop into sepsis and endanger the life of the mother. It is a difficult problem in obstetrics. The incidence of placenta increta is increasing due to the continuous increase of a number of related factors, such as cesarean section, uterine cavity surgery, and elderly pregnant women. Currently, various guidelines on the treatment of placenta increta focus recommend hysterectomy. However, with the adjustment of the fertility policy, more and more patients have a strong desire to retain the uterus, and the conservative treatment of placenta increta has become more common worldwide. We report a case study of a patient with a uterine cavity infection due to placenta increta. The report outlines the clinical manifestations, laboratory examinations, imaging examinations, pathological examinations, interventional therapy, and traditional Chinese medicine treatment. After vaginal delivery, the woman was diagnosed with placenta increta and uterine cavity infection. After active treatment, the implanted tissue could not be discharged normally, and the complicated infection could not be effectively controlled. After treatment with the Simiao Yongan decoction, the implanted tissue discharged totally. The infection index gradually decreased, the clinical manifestations returned to normal, and the prognosis was good. In this case, Chinese medicine effectively treated the uterine cavity infection caused by placenta increta after vaginal delivery. Thus, these results provide a new diagnosis and treatment choice for placental increta in clinical practice.


Assuntos
Placenta Acreta , Placenta Prévia , Idoso , Cesárea , China , Feminino , Humanos , Placenta , Placenta Acreta/terapia , Gravidez
8.
Ann Transl Med ; 10(20): 1101, 2022 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-36388780

RESUMO

Background: Subclinical hypothyroidism (SH) is common during pregnancy. It is not clear whether decidual cells in SH undergo pyroptosis during pregnancy. This study aimed to investigate the possible mechanism of Bushen Antai recipe (BAR) in the treatment of SH in early pregnancy and the relationship between SH during pregnancy and decidual cell pyroptosis through a rat model. Methods: A total of 60 female rats were divided into control group, model group, levothyroxine (L-T4) group, low-dose BAR group (6 g/kg), medium-dose BAR group (12 g/kg), and high-dose BAR group (24 g/kg). The control group underwent pseudothyroidectomy, while the remaining groups established nonpregnant SH rat models. Except for the blank control group, rats were successfully established with SH models during pregnancy. The control group and the model group were treated with saline or BAR. The animals were sacrificed 12 hours after the last administration. The levels of serum thyroid-stimulating hormone (TSH), free thyroxine (FT4), interleukin-1ß (IL-1ß), and interleukin-18 (IL-18) were detected by enzyme-linked immunosorbent assay (ELISA). Western blot was used to detect the expression of decidual nucleotide-binding oligomerization domain-like receptor protein 3 (NLRP3) inflammasome, Caspase-1, and porin family proteins. Results: There was no significant difference in serum FT4 among groups (P>0.05). Compared with the control group, serum TSH, IL-1ß, IL-18, and NLRP3, Caspase-1, and gasdermin D (GSDMD) proteins in the decidua of the model group were significantly increased (P<0.05). Compared with the model group, the L-T4 group and the high-dose BAR group could significantly decrease the levels of serum TSH, IL-1ß, IL-18, and NLRP3, Caspase-1, and GSDMD in decidual tissue (P<0.05). The medium dose of BAR could significantly decrease the levels of TSH, NLRP3, Caspase-1, and GSDMD (P<0.05), and the low dose group of BAR significantly decreased the levels of TSH, NLRP3, and GSDMD (P<0.05). Among them, the high-dose group of BAR had the best reducing effect on IL-18, NLRP3, Caspase-1, and GSDMD. Conclusions: The decidual cells of SH rats in early pregnancy underwent pyroptosis with a high inflammatory response. BAR could improve TSH level in SH during pregnancy, inhibit decidual cell pyroptosis, and reduce the expression of inflammatory factors.

9.
Front Pharmacol ; 13: 821521, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35197857

RESUMO

Zinc is an essential trace element important for the physiological function of the central nervous system. The abnormal accumulation of zinc inside neurons may induce mitochondrial dysfunction and oxidative stress, which contribute to many brain diseases. We hypothesized that natural anthraquinone derivative emodin can protect against neurotoxicity induced by pathological concentrations of zinc via the extracellular signal-regulated kinase 1/2 (ERK1/2) signaling pathway and alleviate oxidative stress and mitochondrial dysfunction. Human neuroblastoma (SH-SY5Y 26 cells) was treated with zinc sulfate and different concentrations of emodin, and changes in the levels of ETK1/2 expression, oxidative stress (DCFH-DA staining), mitochondrial function (JC-1 staining), lipid peroxidation (4-hydroxynonenal staining), and DNA oxidation (8-hydroxy-2-deoxyguanosine staining) were examined. Emodin ameliorated zinc-induced altered expression of levels of phosphorylated ERK1/2 (not total ETK1/2) and synaptic proteins (presynaptic SNAP 25, synaptophysin and postsynaptic PSD95) in SH-SY5Y cells. Moreover, emodin inhibited the generation of reactive oxygen species and oxidative stress and facilitated the collapse of mitochondrial membrane potential (ΔΨm) in SH-SY5Y cells. In conclusion, our results indicated that emodin exerts neuroprotective effects against zinc by normalizing synaptic impairment by decreasing the phosphorylation of ERK1/2, reducing reactive oxygen species and protecting mitochondrial function.

10.
Exp Ther Med ; 22(4): 1072, 2021 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-34447465

RESUMO

The present study hypothesized that fumaric acid and succinic acid may exhibit therapeutic effects on gestational hypertension. During pregnancy, estrogen upregulates ten-eleven translocation 1 (TET1) expression, which subsequently increases calcium-activated potassium channel subunit ß1 (KCNMB1) expression. KCNMB1 is associated with hypertension. Fumaric acid and succinic acid are understood to inhibit TET. Therefore, the present study investigated whether fumaric acid and succinic acid exhibit therapeutic effects on gestational hypertension and whether these effects are mediated by TET1 and KCNMB1. Nω-Nitro-L-arginine methyl ester hydrochloride was injected into rats to establish a gestational hypertension model. Dimethyl fumarate (DMF) and succinic acid were administrated into rats to treat gestational hypertension. Rats were divided into five groups: i) Control; ii) model; iii) DMF; iv) succinic acid; and v) DMF + succinic acid. Blood pressure was monitored by a noninvasive meter and urinary protein was determined using a urinary protein kit. Placenta pathology was examined by hematoxylin-eosin staining. Compared with the control group, urinary protein and blood pressure in the model group increased significantly. The placental cells in the control group were arranged orderly. However, in the model group, decidual cellular edema of placenta and vacuolar degeneration were observed, and the intervascular membrane was markedly thicker with plenty of fibrin deposition. These results indicate successful establishment of a gestational hypertension model. However, compared with the model group, urinary protein, blood pressure, edema, vacuoles and fibrin deposition were markedly reduced in the DMF, succinic acid and DMF + succinic acid groups. mRNA and protein levels of TET1 and KCNMB1 in placenta were evaluated by immunohistochemical analysis, reverse transcription-quantitative polymerase chain reaction and western blotting. The TET1 and KCNMB1 levels in the model group were markedly increased compared with those in the control group. However, compared with the model group, the expression levels were markedly downregulated in the DMF, succinic acid and DMF + succinic acid groups. In conclusion, fumaric acid and succinic acid may treat gestational hypertension by downregulating the expression of KCNMB1 and TET1.

11.
Zhongguo Shi Yan Xue Ye Xue Za Zhi ; 29(6): 1887-1891, 2021 Dec.
Artigo em Zh | MEDLINE | ID: mdl-34893128

RESUMO

OBJECTIVE: To investigate the genetic mutation types and ethnic distribution characteristics of thalassemia in Guiyang. METHODS: The population underwent physical examination, antenatal examination and pre-pregnancy examination in our hospital from January 2019 to November 2019 was selected, and the thalassemia gene was detected by RDB-PCR. RESULTS: Among the 4 572 samples, 346 were positive , and the total carrying rate was 7.57%. The carrying rate of α-thalassaemia gene was 5.42% (248 cases), while ß-thalassemia was 1.99% (91 cases), and α+ß-compound thalassemia was 0.15% (7 cases). α-thalassaemia genotype with the lack of right side -α3.7/αα (52.82%) was the most common, followed by -SEA/αα (25.00%) and -α4.2/αα (10.48%). ß-thalassemia genotype was mainly CD17 (A→T) (51.65%), followed by CD41-42 (-TCTT) (25.27%) and IVS-2-654 (C→T) (12.09%). One case of rare αα/αααanti3.7 and one case of rare HBB:c.-153C>A (-103 C>A) mutation were detected. Among the 346 positive samples, 264 were from the Han nationality and 82 from the ethnic minorities, among which Buyi nationality accounted for the most (35.80%), followed by Miao nationality (20.54%). CONCLUSION: The gene types of thalassemia in Guiyang are complex and varied. The -α3.7/αα is the most common genotype of α-thalassemia, while CD17 (A→T) (51.65%) is the most common genotype of ß-thalassemia. The carrying rate of thalassemia in the Buyi nationality is higher than other nations, it is necessary to carry out regular monitoring and publicity.


Assuntos
Etnicidade , Talassemia alfa , China , Minorias Étnicas e Raciais , Feminino , Humanos , Mutação , Gravidez , Talassemia alfa/genética
12.
Artigo em Inglês | MEDLINE | ID: mdl-34950216

RESUMO

BACKGROUND: Shu-Di-Huang (Radix Rehmanniae Praeparata, RR) and Gan-Cao (liquorice, L) are frequently used traditional Chinese herb pair in treating osteoporosis (OP). However, the exact mechanism of the RR and L herb pair (RR-L) remains unclear. To explore the efficacy and possible mechanisms of RR-L in treating OP, in silico, in vitro, and in vivo experiments were conducted in the current study. METHODS: In silico, potential therapeutic target genes and active chemical compounds of RR-L herb pair were predicted and constructed into a network. In vivo, 30 Sprague Dawley rats were divided into 3 groups, including the sham group, the OP model group, and the RR-L-treated OP group. Micro-CT and pathological sections were conducted to validate the therapeutic effects of RR-L in treating OP. MSCs of rats were isolated and cultured in vitro to validate the mesenchymal stem cells (MSCs) related phenotype changes, including Alizarin red staining, Oil red staining, and immunofluorescence. In vitro, cell proliferation analysis, Alizarin red staining, Oil red staining, immunofluorescence of NF-κB, and protein expression of PPARγ, RUNX2, OCN, and p65 were conducted on MSCs to explore the RR-L containing serum in vitro. Also, activator and inhibitor of NF-κB signaling pathway were introduced to determine the possible mechanism of RR-L in the treatment of OP via enhancing MSCs proliferation and differentiation. RESULTS: In silico, 168 chemical compounds with a property of oral bioavailability ≥30% and drug-likeness ≥0.18 were recognized as potentially active compounds in RR-L and 249 genes were found to be the targets of which. Among them, 120 genes were found to be therapeutic genes of RR-L in treating OP and KEGG and GO analysis of which demonstrated that RR-L involves in lipid metabolism and multiple inflammation-related signaling pathways. In vivo, ovariectomy- (OVX-) induced OP phenotypes in Sprague Dawley rats include bone mineral density and microarchitecture damaging, abnormal bone metabolism, upregulation of inflammation markers, and damaged differentiation potential of MSCs. Treatment of RR-L reversed the trend and restored the differentiation potential of MSCs. In vitro, RR-L containing serum promoted the osteogenic differentiation and suppressed adipogenic differentiation of MSCs via downregulation of the NF-κB signaling pathway. Also, RR-L containing serum inhibited the tumor necrosis factor-α (TNF-α) induced activation of the NF-κB signaling pathway. On the opposite, the addition of the NF-κB specific inhibitor significantly reduced the effect of RR-L on MSCs. CONCLUSIONS: In the current study, network pharmacology prediction and experimental validation elucidated that the RR-L herb pair restored damaged MSC differentiation potential via the NF-κB signaling pathway; this could be the possible mechanism of RR-L in treating OP. This finding provides an alternative option in OP therapy.

13.
Talanta ; 225: 121846, 2021 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-33592689

RESUMO

MIL-101(Cr) and graphene aerogel (GA) were hybridized as a multifunctional adsorbent for the preconcentration of trace analytes. The novel MIL-101(Cr)@GA was prepared and characterized by FTIR, XRD and SEM, where GA is serving as a carrier for MIL-101(Cr). The synthesized composite as a solid phase extraction (SPE) sorbent combined with UPLC-MS/MS was applied for the determination and quantification of five NSAIDs (phenacetin, meloxicam, naproxen, diclofenac sodium and carprofen) in different environmental water samples. The parameters influencing the whole extraction process were systematically optimized. Under the most favorable. conditions, good sensitivity was achieved with a limit of detection between 0.006 and 0.012 ng mL-1, the linear range of 0.02-2 ng mL-1 for phenacetin, meloxicam and 0.05-5 ng mL-1 for naproxen, diclofenac sodium, carprofen (r2 ≥ 0.9940). The satisfactory recoveries of the target analytes were in the range from 77.2 to 103.3% with relative standard deviation (RSD) from 0.6% to 8.4%. The established method was proved to be simple, highly sensitive and accurate. The adsorbent could be reusable up to nine cycles without any decrease in performance, which provides economic strategy and little waste generation. Adsorption behaviors were explored by choosing two typical types of NSAIDs as models to measure the adsorption capacity of MIL-101(Cr)@GA. The maximum adsorption capacities for PHE and NAP were 232.5 and 333.3 mg g-1, respectively.


Assuntos
Grafite , Estruturas Metalorgânicas , Poluentes Químicos da Água , Adsorção , Anti-Inflamatórios não Esteroides/análise , Cromatografia Líquida de Alta Pressão , Cromatografia Líquida , Extração em Fase Sólida , Espectrometria de Massas em Tandem , Água , Poluentes Químicos da Água/análise
14.
Talanta ; 196: 572-578, 2019 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-30683407

RESUMO

In this research, microwave assisted magnetic solid phase extraction (MAE-MSPE) coupled with GC-ECD have been successfully used for the determination of eight organochlorine pesticides in soil samples. Specially, the novel Fe3O4-NH2@MIL-101(Cr) composites as the MSPE sorbent played a role of selective enrichment and purification towards the targets. The MAE-MSPE procedure was optimized focusing on microwave extraction temperature and time, solution pH, the amount of sorbent, ultrasonic extraction time, ionic strength, elution solvent type, elution solvent volume, and elution time. The parameters of the analytical method were evaluated. Under the optimal condition, the detection limits of α-HCH, ß-HCH, γ-HCH, δ-HCH, p,p'-DDE, p,p'-DDD, o,p'-DDT, and p,p'-DDT were in the range of 0.15-0.28 ng g-1. Satisfactory recoveries were obtained in the range of 71.2-102.4% with the RSDs less than 10.0%. The obtained results demonstrated that the method was suitable for the trace analysis of OCPs. Additionally, molecular docking was employed to calculate the molecular interactions and free binding energies between MIL-101(Cr) and the organochlorines.

16.
Huan Jing Ke Xue ; 36(3): 847-54, 2015 Mar.
Artigo em Zh | MEDLINE | ID: mdl-25929050

RESUMO

A batch equilibrium method was used to investigate the adsorption characteristics of ciprofloxacin (CIP), tetracycline (TC), sulfamethoxazole (SMX) and triclosan (TCS) onto Huangpu River sediments. Effects of adsorption time, initial concentration, solution pH and temperature on the adsorption process were studied. The results showed that the adsorption process of these PPCPs onto sediments was a two-step process: a rapid adsorption followed by a slow balance. The equilibrium time was about 4 h. The pH value had a significant effect on the adsorption of CIP, TC and TCS, whereas the effect on SMX adsorption was negligible. The kinetic results indicated that the adsorption processes followed the pseudo-second-order model, with adsorption rate in the range of 4.89 x 10(-3)-1.96 x 10(-2) kg x (min x mg)(-1). Adsorption isotherms were well described by the Freundlich and linear equations. As temperature increased, the amount of SMX and TC adsorbed increased, whereas CIP and TCS decreased. CIP, TC and TCS had a strong tendency to adsorb onto sediments, while the adsorption of SMX was unfavorable. When the initial concentration of PPCPs was 10 mg x L(-1), the equilibrium adsorption capacities of CIP, TC, SMX and TCS reached 702.8, 733.1, 54.7 and 695.0 mg x kg(-1), respectively.


Assuntos
Resíduos de Drogas/química , Sedimentos Geológicos/química , Adsorção , Ciprofloxacina/química , Cinética , Rios , Sulfametoxazol/química , Temperatura , Tetraciclina/química , Triclosan/química
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA