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1.
Tunis Med ; 96(7): 437-441, 2018 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-30430488

RESUMO

BACKGROUND: Hepatocellular carcinoma (HCC) is a public health problem in african countries. The chemoembolization (CE) could represent the only therapeutic strategy. Two methods can be proposed: charged microparticles and lipiodol chemoembolization. The purpose of this study was to compare results, morbidity and survival between charged microparticles and lipiodol chemoembolization. METHODS: A 5 years retrospective, study was conducted including 62 patients with HCC treated by chemioembolization. The efficacy of the treatment was evaluated for patients by performing a computed tomography four to six weeks after the act. We used « European Association for Study of the Liver ¼ criteria to evaluate the therapeutic outcome. RESULTS: A total of 102 sessions of chemoembolization were performed. This was a with charged microparticles in 70 cases (68.6%) and lipiodol chemoembolization in 32 cases (31.3 %). The difference was not significant between the two CE techniques (lipiodol and charged microparticles) in terms of complete and objective response and complications. The mean survival rate was 30 months ± 4 for all techniques combined, with no statistically significant difference in terms of survival time without recurrence between the two chemoembolization techniques. CONCLUSION: The efficacy, morbidity and survival of the two CE techniques to lipiodol or microfilled particles are comparable. The selectivity of the technique is to be taken into consideration. For economic health purposes, the CE lipiodolée appears to be more adapted to the context of the developing African countries.


Assuntos
Carcinoma Hepatocelular/terapia , Quimioembolização Terapêutica/métodos , Neoplasias Hepáticas/terapia , Padrões de Prática Médica/estatística & dados numéricos , Adolescente , Adulto , África do Norte/epidemiologia , Idoso , Idoso de 80 Anos ou mais , Carcinoma Hepatocelular/diagnóstico , Carcinoma Hepatocelular/epidemiologia , Quimioembolização Terapêutica/efeitos adversos , Quimioembolização Terapêutica/estatística & dados numéricos , Óleo Etiodado/uso terapêutico , Feminino , Humanos , Neoplasias Hepáticas/diagnóstico , Neoplasias Hepáticas/epidemiologia , Masculino , Microesferas , Pessoa de Meia-Idade , Radioterapia (Especialidade)/métodos , Radioterapia (Especialidade)/estatística & dados numéricos , Estudos Retrospectivos , Taxa de Sobrevida , Tomografia Computadorizada por Raios X , Resultado do Tratamento , Adulto Jovem
2.
Tunis Med ; 96(4): 167-170, 2018 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30430518

RESUMO

BACKGROUND: The Laparoscopic treatment of perforated ulcer is accompanied by a lesser morbidity and mortality compared with treatment by laparotomy. However, the morbidity of the laparoscopic approach is not nil (4%). It is influenced by pre and intraoperative factors. The aim of our work is to establish a morbidity score in patients undergoing laparoscopic surgery for acute peritonitis with perforated duodenal ulcer. METHODS: This is a retrospective study conducted in a General Surgery Department. We included 384 cases of perforated duodenal ulcer operated laparoscopically over a fourteen-year period ranging from January 2000 to December 2014. We conducted a multivariate logistical regression analysis by step-by-step-descending method. From these independent factors we established a score using the ROC curves. The threshold with the best sensitivity and specificity for predicting morbidity was investigated. In all statistical tests, the significance level was set at 0.05. RESULTS: The overall morbidity rate of our patients was 3.38% (13 patients). Multivariate analysis has identified five independent morbidity risk factors: temperature higher than 37.6° C, renal failure, age> 45 years, a number of stitches of two or higher and operating time to 75 minutes or longer. Our morbidity score took into account these 5 factors by integrating the intrinsic value of each factor. The threshold of the score having the best torque sensitivity specificity to predict morbidity was 10. CONCLUSION: A morbidity score for perforated duodenal ulcer surgery performed by laparoscopy may be useful to organize the post-operativecare of these patients usually young and active. A lower score than the threshold predictive of morbidity could allow a rapid rehabilitation of these patients and a one day hospitalization management.


Assuntos
Úlcera Duodenal/cirurgia , Laparoscopia/efeitos adversos , Úlcera Péptica Perfurada/cirurgia , Adolescente , Adulto , Fatores Etários , Idoso , Idoso de 80 Anos ou mais , Estudos de Coortes , Úlcera Duodenal/complicações , Feminino , Febre/complicações , Humanos , Masculino , Pessoa de Meia-Idade , Duração da Cirurgia , Complicações Pós-Operatórias , Insuficiência Renal/complicações , Estudos Retrospectivos , Fatores de Risco , Adulto Jovem
3.
Tunis Med ; 95(6): 434-439, 2017 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-29512800

RESUMO

BACKGROUND: Extracapsular extension of nodal metastasis has recently emerged as an important prognostic factor in different malignancies. In colorectal cancer (CRC), only a limited number of studies have been published and its prognostic value has not yet been completely established. AIMS: To assess the incidence of extracapsular invasion (ECI) in lymph node (LN) metastasis in colorectal adenocarcinoma and to investigate the correlation between this parameter and other clinico-pathological factors.  Furthermore, its effect on overall and disease free survival were evaluated. METHODS: Seventy-five patients who underwent colorectal resection for adenocarcinoma with node metastasis were included in this study. Extracapsular invasion was evaluated by two pathologists. Associations between clinicopathologic factors, survival, and the nodal findings were evaluated. The 2009 pTNM staging of CRC was used. RESULTS: Extracapsular invasion was identified in 45 patients (60 %). Average follow-up time was 25 months. Extracapsular invasion was correlated with pT stage> pT2 (p=0,015), pN stage > pN1 (p= 0,014), distant metastasis at diagnosis (p=0,005) and later (p=0,01) and with local recurrences (p=0,0001). Univariate analysis indicated that ECI tends to decrease overall survival but not significantly.  Multivariate analysis showed that age and synchronic metastasis were independent prognostic factors (HR = 2,03 and 2,24; p= 0,039 and 0,012 respectively). Patients with ECI had a significantly worse five-year disease-free survival than ECI-negative groups. CONCLUSION: In patients with CRC, ECI in regional LNs would reflect an aggressive behavior. It would therefore be useful to include this parameter in standardized pathologic reports and future staging systems.


Assuntos
Adenocarcinoma/secundário , Neoplasias Colorretais/patologia , Metástase Linfática , Adenocarcinoma/mortalidade , Adenocarcinoma/cirurgia , Adulto , Idoso , Idoso de 80 Anos ou mais , Neoplasias Colorretais/mortalidade , Neoplasias Colorretais/cirurgia , Estudos Transversais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Invasividade Neoplásica , Prognóstico , Taxa de Sobrevida
4.
Tunis Med ; 95(5): 347-352, 2017 May.
Artigo em Inglês | MEDLINE | ID: mdl-29509216

RESUMO

INTRODUCTION: The prognosis of hepatic metastases in colorectal cancers is constantly being improved at the cost of multidisciplinary care, allowing each patient to have an adapted strategy. The prognostic factors make it possible to recognize patients needing further treatment after resection and closer monitoring. OBJECTIVE: The aim of our study was to conduct a prognostic study to identify factors influencing survival at 5 years for patients operated of colorectal liver metastases. METHODS: This is a retrospective study conducted over a period of 10 years (2005-2015). All patients operated for liver metastasis of colorectal cancers were included. The primary endpoint was overall survival. Secondary endpoints were recurrence-free survival and operative morbidity and mortality. The proportions were compared by the Chi 2 test. The survival curves were established according to the Kaplan-Meier method and the comparison of the curves according to the Logrank test. A univariate and then multivariate Cox model was used to determine prognostic factors. The significance level was set at 0.05. RESULTS: Overall survival of our patients at 3 and 5 years was 49% and 32% respectively. Recurrence-free survival was 21% at 3 years and 15% at 5 years. In multivariate analysis, the hepatic resection margin <1 mm and the number of hepatic metastases ≥3 were independent factors correlated with survival. CONCLUSIONS: colorectal liver metastases surgery improves patient survival. Some factors need to be sought to adapt care strategies.


Assuntos
Neoplasias Colorretais/diagnóstico , Neoplasias Colorretais/patologia , Neoplasias Colorretais/cirurgia , Neoplasias Hepáticas/diagnóstico , Neoplasias Hepáticas/secundário , Neoplasias Hepáticas/cirurgia , Adulto , Idoso , Estudos de Coortes , Neoplasias Colorretais/mortalidade , Feminino , Hepatectomia , Humanos , Fígado/patologia , Neoplasias Hepáticas/mortalidade , Masculino , Pessoa de Meia-Idade , Prognóstico , Estudos Retrospectivos , Análise de Sobrevida , Resultado do Tratamento
5.
Tunis Med ; 94(10): 594-598, 2016 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-28972250

RESUMO

BACKGROUND: during this century, therapeutic management of rectal cancer has known a lot of advances. Survival is still depending on factors related to the patient, the tumor or the surgeon. AIM: The aim of our study is to report survival and prognosis factors of our patients managed for a rectal cancer. METHODS:   We report an descreptive retrospective study about 154 patients. SPSS 19.0 version was used for the statistical analysis. Desriptive study was done using means, and pourcentage. Survival was analysed using Kaplan meier curve. In univariate analysis, we calculated the odd ratio in order to evaluate risk factors. Multivariate analysis used Cox model. Significancy was 0.05. RESULTS:   Global survival was 52.4% at 3 years and 42.4% at 5 years. Free reccurence survival was 76%  at 3 years and 69.15% at 5 years. In univariate analysis, factors significantly influencing survival were age>70 years, CAE level, tumor perforation, TNM, tumor differentiation, peroperative blood transfusion, and reccurency. In multivriate analysis, only age > 70 years, T and local reccurency were independants factors influencing survival. CONCLUSION:   A better knowledge of prognosis factors ead to a better management of this cancer with more adjuvant treatment indications and closer monitoring.


Assuntos
Adenocarcinoma/mortalidade , Neoplasias Retais/mortalidade , Adenocarcinoma/patologia , Adenocarcinoma/secundário , Adenocarcinoma/cirurgia , Idoso , Análise de Variância , Intervalo Livre de Doença , Feminino , Humanos , Estimativa de Kaplan-Meier , Neoplasias Hepáticas/secundário , Neoplasias Pulmonares/secundário , Masculino , Pessoa de Meia-Idade , Estadiamento de Neoplasias , Prognóstico , Neoplasias Retais/patologia , Neoplasias Retais/cirurgia , Estudos Retrospectivos , Taxa de Sobrevida
6.
Tunis Med ; 94(8-9): 594-598, 2016 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-28685794

RESUMO

BACKGROUND: during this century, therapeutic management of rectal cancer has known a lot of advances. Survival is still depending on factors related to the patient, the tumor or the surgeon. AIM: The aim of our study is to report survival and prognosis factors of our patients managed for a rectal cancer. METHODS:   We report an descreptive retrospective study about 154 patients. SPSS 19.0 version was used for the statistical analysis. Desriptive study was done using means, and pourcentage. Survival was analysed using Kaplan meier curve. In univariate analysis, we calculated the odd ratio in order to evaluate risk factors. Multivariate analysis used Cox model. Significancy was 0.05. RESULTS:   Global survival was 52.4% at 3 years and 42.4% at 5 years. Free reccurence survival was 76%  at 3 years and 69.15% at 5 years. In univariate analysis, factors significantly influencing survival were age>70 years, CAE level, tumor perforation, TNM, tumor differentiation, peroperative blood transfusion, and reccurency. In multivriate analysis, only age > 70 years, T and local reccurency were independants factors influencing survival. CONCLUSION:   A better knowledge of prognosis factors ead to a better management of this cancer with more adjuvant treatment indications and closer monitoring.


Assuntos
Adenocarcinoma/mortalidade , Neoplasias Retais/mortalidade , Fatores Etários , Análise de Variância , Intervalo Livre de Doença , Humanos , Estimativa de Kaplan-Meier , Estadiamento de Neoplasias , Prognóstico , Estudos Retrospectivos , Taxa de Sobrevida
7.
Tunis Med ; 92(10): 593-600, 2014 Oct.
Artigo em Francês | MEDLINE | ID: mdl-25860672

RESUMO

BACKGROUND: In recent years, multidisciplinary therapeutic management of rectal cancer has evolved. This progress had interest radio and chemotherapy. AIM: To describe the main spots of the progress in the therapeutic strategies of the disease, surgical techniques and standardization of these techniques, particularly regarding locoregional extension in the mesorectum. METHOD: Literature review. RESULTS: Treatment of rectal cancer is multidisciplinary. On the surgical field, excision of the mesorectum (total mesorectal excision [TME]) has reduced local recurrence and the genitourinary sequelae. Meanwhile, chemoradiotherapy has become important. The standard now is to indicate to T3 T4 N+ tumors to decrease local recurrence without improving survival, however. CONCLUSION: Advances in the management of rectal cancer with both imaging progress and therapeutic modalities have improved the prognosis and survival of this cancer.


Assuntos
Diagnóstico por Imagem/tendências , Neoplasias Retais/terapia , Terapias em Estudo/tendências , Quimiorradioterapia/tendências , Diagnóstico por Imagem/métodos , Procedimentos Cirúrgicos do Sistema Digestório/tendências , Humanos , Guias de Prática Clínica como Assunto , Neoplasias Retais/diagnóstico , Terapias em Estudo/métodos
8.
Tunis Med ; 92(12): 732-6, 2014 Dec.
Artigo em Francês | MEDLINE | ID: mdl-25879598

RESUMO

BACKGROUND: feasibility and advantages of laparoscopic approach in performed duodenal ulcer have no longer to be demonstrated. Laparoscopic suture and peritoneal cleaning expose to a conversion rate between 10 and 23%. However less than laparotomy, morbidity of this approach is not absent. AIM: This study aim to analyze factors exposing to conversion after laparoscopic approach of perforred duodenal ulcer. We also aim to define the morbidity of this approach and predictive factors of this morbidity Methods: Retrospective descriptive study was conducted referring all cases of perforated duodenal ulcer treated laparoscopically over a period of ten years, running from January 2000 to December 2010. All patients were operated by laparoscopy with or without conversion. We have noted conversion factors. A statistical analysis with logistic regression was performed whenever we have sought to identify independent risk factors for conversion verified as statistically significant in univariante. The significance level was set at 5%. Analytic univariant and multivariant study was performed to analyze morbidity factors. RESULTS: 290 patients were included. The median age was 34ans.T he intervention was conducted completely laparoscopically in 91.4% of cases. The conversion rate was 8.6%. It was selected as a risk factor for conversion: age> 32 years, a known ulcer, progressive pain, renal function failure, a difficult peritoneal lavage and having a chronic ulcer. Postoperative morbidity was 5.1%. Three independent risk factors of surgical complications were selected: renal failure, age> 45 years, and a chronic ulcer appearance. CONCLUSION: Laparoscopic treatment of perforred duodenal ulcer expose to a conversion risk. Morbidity is certainly less than laparotomy and a better Knowledge of predictif's morbidity factors become necessary for a better management of this disease.


Assuntos
Conversão para Cirurgia Aberta/estatística & dados numéricos , Úlcera Duodenal/cirurgia , Laparoscopia , Úlcera Péptica Perfurada/cirurgia , Complicações Pós-Operatórias/epidemiologia , Adulto , Conversão para Cirurgia Aberta/efeitos adversos , Úlcera Duodenal/complicações , Úlcera Duodenal/epidemiologia , Endoscopia Gastrointestinal/efeitos adversos , Endoscopia Gastrointestinal/métodos , Feminino , Humanos , Laparoscopia/efeitos adversos , Laparoscopia/métodos , Masculino , Morbidade , Úlcera Péptica Perfurada/epidemiologia , Complicações Pós-Operatórias/diagnóstico , Estudos Retrospectivos , Falha de Tratamento
9.
Curr Drug Deliv ; 2023 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-37680160

RESUMO

INTRODUCTION: In recent decades, drug delivery applications have extensively utilized hydrogel systems based on natural polymers. Among the numerous biopolymer-based hydrogel drug delivery systems reported, a novel pectin-like substance was extracted from fig leaves and copolymerized with chitosan. METHOD: The hydrogel was reformed into microspheres using glutaraldehyde (chemical cross-linker) and sodium hexametaphosphate (physical cross-linker). The extracted polysaccharide and the prepared hydrogels were characterized by FTIR, GC/MS, SEC/MALS/DRI as well as XRD, SEM, BET, and thermal analysis. SEM images revealed the formation of porous microspheres with an average size of 50 µm in diameter. Degrees of swelling in pH7 at 35°C have shown the hydrogels reached two to three times their weights. This has been reflected in their ability to load drugs or any other chemicals. The loading formula shows that hydrogels have maximum loading efficiency more than one-third of the weight of hydrogel. The antimicrobial ciprofloxacin was used as a model for loading on prepared hydrogels. The loaded hydrogels were tested for their biological activities against staphylococcus aureus (S. aureus) bacteria. The antimicrobial growth inhibition zone of the cultured (S. aureus) by ciprofloxacin-loaded hydrogel was followed, which shows controlled growth in inhibition zone sizes and for long time intervals. Results showed that the pectin-chitosan hydrogels exhibited significant antibacterial activity against gram - positive bacteria (S. aureus), with an inhibition zone of 45 mm for (CH-co-FLP)/GLU hydrogel. RESULT: In vitro, the ciprofloxacin-loaded hydrogels were studied and the cumulative release of ciprofloxacin under suitable conditions was found in a controlled manner and kept release for a long time interval. Data exhibited that the cumulative release profile of ciprofloxacin from the hydrogel demonstrated sustained release over 48 hours, with a value of 6.9% released within the first 24 hours and 7.0 and 6.9% % released at the end of the study for the (CH-co-FLP)/GLU and (CH-co-FLP)/SMP hydrogels, respectively. CONCLUSION: The novel pectin-chitosan hydrogels hold the potential to enhance the quality of life for numerous patients by minimizing the need for frequent intake of chronic medications.

10.
Antioxidants (Basel) ; 12(2)2023 Feb 10.
Artigo em Inglês | MEDLINE | ID: mdl-36830010

RESUMO

Coriandrum sativum is one of the most widespread curative plants in the world, being vastly cultivated in arid and semi-arid regions as one of the oldest spice plants. The present study explored the extraction of polysaccharides from Coriandrum sativum seeds and the evaluation of their antioxidant potential and hepatoprotective effects in vivo. The polysaccharide from coriander seeds was extracted, and the structural characterization was performed by FT-IR, UV-vis, DSC, NMR (1D and 2D), GC-MS, and SEC analysis. The polysaccharide extracted from Coriandrum sativum (CPS) seeds was characterized to evaluate its antioxidant and hepatoprotective capacities in rats. Results showed that CPS was composed of arabinose, rhamnose, xylose, mannose, fructose, galactose, and glucose in molar percentages of 6.2%, 3.6%, 8.8%, 17.7%, 5.2%, 32.9%, and 25.6%, respectively. Further, CPS significantly hindered cadmium-induced oxidation damage and exercised a protective effect against Cd hepatocytotoxicity, with a considerable reduction in MDA production and interesting CAT and SOD enzyme levels. Results suggest that CPS might be employed as a natural antioxidant source.

11.
Foods ; 12(6)2023 Mar 18.
Artigo em Inglês | MEDLINE | ID: mdl-36981228

RESUMO

The goal of this work was to investigate the impact of the flavoring of some aromatic plants/spices, including rosemary (R), lemon (L) and orange (O) at the concentration of 5% and 35% (w/w) added by 2 methods (conventional maceration and direct flavoring), on quality attributes, chemical changes and oxidative stability of extra virgin olive oil (EVOO). Six flavored oils were obtained (EVOO + O, O + O, EVOO + R, O + R, EVOO + L and O + L). The physicochemical parameters (water content, refractive index, acidity and peroxide value, extinction coefficient, fatty acids, volatile aroma profiles, Rancimat test, phenols and pigments composition) of the flavored oils were investigated. Based on the results obtained, it was observed that flavoring with a conventional process provided increased oxidative stability to the flavored oils, especially with rosemary (19.38 ± 0.26 h), compared to that of unflavored oil. The volatile profiles of the different flavored oils revealed the presence of 34 compounds with the dominance of Limonene. The fatty acid composition showed an abundance of mono-unsaturated fatty acids followed by poly-unsaturated ones. Moreover, a high antioxidant activity, a significant peripheral analgesic effect (77.7% of writhing inhibition) and an interesting gastroprotective action (96.59% of ulcer inhibition) have been observed for the rosemary-flavored oil. Indeed, the flavored olive oils of this study could be used as new functional foods, leading to new customers and further markets.

12.
Int J Biol Macromol ; 173: 554-579, 2021 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-33508358

RESUMO

The preparation, chemical properties and bio-activities of polysaccharides derived from halophytes have gained an increasing interest in the past few years. Phytochemical and pharmacological reports have shown that carbohydrates are important biologically active compounds of halophytes with numerous biological potentials. It is believed that the mechanisms involved in these bio-activities are due to the modulation of immune system. The main objective of this summary is to appraise available literature of a comparative study on the extraction, structural characterizations and biological potentials, particularly immunomodulatory effects, of carbohydrates isolated from halophytes (10 families). This review also attempts to discuss on bioactivities of polysaccharides related with their structure-activity relationship. Data indicated that the highest polysaccharides yield of around 35% was obtained under microwave irradiation. Structurally, results revealed that the most of extracted carbohydrates are pectic polysaccharides which mainly composed of arabinose (from 0.9 to 72%), accompanied by other monosaccharides (galactose, glucose, rhamnose, mannose and xylose), significant amounts of uronic acids (from 18.9 to 90.1%) and some proportions of fucose (from 0.2 to 8.3%). The molecular mass of these pectic polysaccharides was varied from 10 to 2650 kDa. Hence, the evaluation of these polysaccharides offers a great opportunity to discover novel therapeutic agents that presented especially beneficial immunomodulatory properties. Moreover, reports indicated that uronic acids, molecular weights, as well as the presence of sulfate and unmethylated acidic groups may play a significant role in biological activities of carbohydrates from halophyte species.


Assuntos
Pectinas/química , Pectinas/farmacologia , Plantas Tolerantes a Sal/química , Sequência de Carboidratos , Imunomodulação , Micro-Ondas , Pectinas/isolamento & purificação , Relação Estrutura-Atividade
13.
Pan Afr Med J ; 38: 118, 2021.
Artigo em Francês | MEDLINE | ID: mdl-33912288

RESUMO

INTRODUCTION: digestive stomas result from a certain number of surgical interventions. They may be temporary or definitive. The patient with stoma has potentially damaging physical and psychological problems. Therefore patient´s adaptation to the changes and acceptance of this temporary or permanent situation is essential. This study aims to assess the impact of intestinal stomas on patients´ quality of life and professional life. METHODS: we conducted a retrospective study from January 2010 to December 2014. During the study period, 115 patients had intestinal stomas. Among these patients, sixty were of working age, had a fixed employment and had resumed their work; they made up the study population. Data were collected using a specific questionnaire: the Short Form-36 (SF-36) health questionnaire conducted in the post-operative period. RESULTS: the average score for the overall quality of life for patients with stoma was 41. Forty patients had poor quality of life with a score SF-36 less than 50. Our study showed that patients with stoma experienced difficulties at work. Forty-eight patients reported discomfort directly linked to stoma during their professional activities. The causes mentioned were physical in 6 cases and psychological in 3 cases. Six patients were moved into more adapted working positions. CONCLUSION: the management of patients with digestive stomas should aim to an adequate social and professional reintegration. This can only be done by involving the occupational physician, the psychologist, the stoma therapist and the associations.


Assuntos
Emprego/psicologia , Enterostomia/psicologia , Qualidade de Vida , Estomas Cirúrgicos , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Retorno ao Trabalho , Inquéritos e Questionários , Adulto Jovem
14.
Nat Prod Res ; 34(10): 1470-1474, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-30445860

RESUMO

In this study, Box-Behnken Design was used to optimize the ultrasonic extraction of polysaccharides from quince peels (QPPs) by ascorbic acid and the effect of extraction temperature, extraction time and pH was evaluated. Under optimized conditions of temperature 90 °C, 60 min sonication time and pH = 3.26, the extraction yield, the galacturonic acid yield and the concentration of sample required to scavenge 50% of 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic) acid (ABTS) values of QPPs were respectively 10.25%, 3.86% and 1.35 mg/mL. The QPPs extracted under optimum conditions was characterized by Fourier transform infrared spectroscopy (FTIR), Nuclear magnetic resonance (1 H NMR) and Size exclusion chromatography (SEC/MALS/VD/DRI). The monosaccharide analysis revealed that arabinose was the most abundant, followed by galactose, glucose, mannose and xylose. Moreover, QPPs showed significant antioxidant activities (2,2-diphenyl-1-picrylhydrazyl (DPPH) and Ferric- reducing antioxidant power (FRAP)) and reduced viability of human Caco-2 and murine B-16 cell lines in a dose-dependent manner. Hence QPPs could be used as antitumor agent in functional foods andpharmaceutical industries.


Assuntos
Antineoplásicos Fitogênicos/farmacologia , Antioxidantes/farmacologia , Polissacarídeos/isolamento & purificação , Polissacarídeos/farmacologia , Rosaceae/química , Animais , Antineoplásicos Fitogênicos/administração & dosagem , Antioxidantes/química , Células CACO-2 , Sobrevivência Celular/efeitos dos fármacos , Fracionamento Químico , Cromatografia em Gel , Relação Dose-Resposta a Droga , Frutas/química , Ácidos Hexurônicos/isolamento & purificação , Humanos , Concentração de Íons de Hidrogênio , Espectroscopia de Ressonância Magnética , Camundongos , Monossacarídeos/análise , Monossacarídeos/química , Extratos Vegetais/química , Polissacarídeos/química , Espectroscopia de Infravermelho com Transformada de Fourier , Temperatura
15.
Int J Biol Macromol ; 159: 547-556, 2020 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-32439441

RESUMO

A Box-Behnken design was used to optimize extraction temperature, extraction time and concentration of the salicylic acid to obtain a maximum polysaccharide yield from Citrus sinensis peels. The optimal settings were: extraction time 3 h, extraction temperature 80 °C and concentration of the salicylic acid 1.5%. Under these conditions, the experimental yield and uronic acid content were 11.74% and 66.9% respectively. Preliminary characterization was performed via FT-IR, SEC/MALS/VD/DRI and GC-MS after hydrolysis. SEC analysis showed that the extracted polysaccharide had a weight average molar mass of 350 kDa and an intrinsic viscosity of 640 mL/g. The GC-MS results revealed that the extracted polysaccharide was composed of arabinose 56.7%, galactose 17.8%, xylose 13.8%, rhamnose 5.1%, mannose 2.5% and glucose 1.5% suggested a rhamnogalacturonan pectin type I with a degree of esterification of 50.9% (IRTF). The flow curve and the dynamic frequency sweep were obtained at 10, 20, 30 and 40 g/L in water and at 30 g/L in presence of CaCl2 or NaCl at 1 mol/L. The solutions showed shear-thinning behavior fitted with Ostwald-De Waele model, except 10 g/L with a Newtonian behavior. The apparent viscosity and, the G' and G" moduli increase with PACO concentration in agreement with a slow-down of the dynamic chain. In the presence of CaCl2 or NaCl the reduction of electrostatic repulsions between pectin chains decreases the rheological parameters. The effect is less sensitive with CaCl2 due to intermolecular interactions. The antiproliferative activity of the extracted pectin on human Caco-2 and Hep-2 cells was very interesting with an IC50 1.4 and 1.8 µg/mL respectively.


Assuntos
Antineoplásicos Fitogênicos/química , Antineoplásicos Fitogênicos/farmacologia , Citrus sinensis/química , Pectinas/química , Pectinas/farmacologia , Reologia , Ácido Salicílico/química , Antineoplásicos Fitogênicos/isolamento & purificação , Carboidratos/química , Carboidratos/isolamento & purificação , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Cromatografia em Gel , Humanos , Peso Molecular , Pectinas/isolamento & purificação , Proteínas de Plantas/química , Proteínas de Plantas/isolamento & purificação , Polissacarídeos/química , Polissacarídeos/isolamento & purificação , Ácido Salicílico/isolamento & purificação , Solubilidade , Espectroscopia de Infravermelho com Transformada de Fourier
18.
Int J Biol Macromol ; 136: 332-340, 2019 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-31202845

RESUMO

Spinacia is an interesting medicinal halophyte plant that is employed as a food and therapeutic agent in traditional medicine. In this work, water-soluble polysaccharides from Spinacia oleracea were extracted and preliminary characterization was established via FT-IR, UV-vis, 1H NMR and SEC/MALS DRI technics. The extracted polysaccharide, with an average molecular mass of 408 kDa, was composed of arabinose, galactose, mannose, glucose, rhamnose and xylose in the molar percentage of 49.3%, 28.1%, 4.9%, 7.8%, 8.2% and 1.7%, respectively. The polysaccharide showed significant antioxidant activity. Moreover, Spinacia polysaccharide, significantly prevented oxidation-induced Cd damage and exhibited a protective effect against Cd cytotoxicity on HEK293 and HCT116 cells, with an important cell viability decrease, an important reduction of MDA production and ROS levels. The outcomes obtained suggest that the Spinacia polysaccharides may be used as an accessible source of natural antioxidants and as potential phytochemicals against kidney and colon cancer.


Assuntos
Antioxidantes/química , Antioxidantes/farmacologia , Cádmio/toxicidade , Citoproteção/efeitos dos fármacos , Polissacarídeos/química , Polissacarídeos/farmacologia , Spinacia oleracea/química , Benzotiazóis/química , Compostos de Bifenilo/química , Sobrevivência Celular/efeitos dos fármacos , Células HCT116 , Células HEK293 , Humanos , Peroxidação de Lipídeos/efeitos dos fármacos , Picratos/química , Espécies Reativas de Oxigênio/metabolismo , Ácidos Sulfônicos/química
19.
Int J Biol Macromol ; 126: 326-336, 2019 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-30543883

RESUMO

This study was designed to characterize the physico-chemical properties of the sulfated polysaccharide (SP) isolated from the red alga Laurencia obtusa and to evaluate its apoptotic, gastroprotective and antioxidant activities. The different macromolecular characteristics of SP were determined by size exclusion chromatography combined with multi-angle laser light-scattering detection (SEC-MALLS), Fourier transform infrared spectroscopy (FTIR) analysis and nuclear magnetic resonance spectroscopy (1H NMR and 13C NMR). The native molecular weight of the extracted polysaccharide is high (≥336,900 g·mol-1). It showed high amounts of sulfated groups (28.2%) and low levels of proteins. It was found to be a potent inducer of apoptosis on acute monocytic leukaemia THP-1cell lines with EC50 value of 53 µg·mL-1. Furthermore, a significant gastroprotective effect (p < 0.01) was also observed with a gastric ulcer inhibition of 63.44%, 78.42% and 82.15% at the doses 25, 50 and 100 mg·kg-1, respectively. In addition, SP significantly increased glutathione levels (GSH) and decreased the concentration of thiobarbituric acid-reactive substances (TBARS) in EtOH/HCl-damaged gastric mucosa in rats; it also exhibited an important antioxidant activity in vitro. Therefore, SP, derived from the red alga Laurencia obtusa, may have a potential therapeutic effect against acute myeloid leukaemia and a beneficial potential as gastroprotective and antioxidant natural product.


Assuntos
Antioxidantes/farmacologia , Apoptose/efeitos dos fármacos , Laurencia/química , Polissacarídeos/farmacologia , Substâncias Protetoras/farmacologia , Estômago/efeitos dos fármacos , Sulfatos/farmacologia , Animais , Antioxidantes/uso terapêutico , Feminino , Sequestradores de Radicais Livres/farmacologia , Humanos , Luz , Espectroscopia de Ressonância Magnética , Masculino , Malondialdeído/metabolismo , Oxirredução , Polissacarídeos/uso terapêutico , Ratos Wistar , Refratometria , Espalhamento de Radiação , Úlcera Gástrica/tratamento farmacológico , Úlcera Gástrica/patologia , Sulfatos/uso terapêutico , Células THP-1 , Testes de Toxicidade Aguda
20.
Food Res Int ; 119: 612-621, 2019 05.
Artigo em Inglês | MEDLINE | ID: mdl-30884696

RESUMO

Nutritional, soluble carbohydrates and aroma volatile profiles of Tunisian wild Swiss chard leaves (Beta vulgaris L. var. cicla) have been characterized. The chemical composition of an ethanol chard leaves extract, as well as its in vitro antioxidant, α-amylase and α-glucosidase inhibition activities were carefully evaluated. The results of the proximate composition showed that total carbohydrate fraction, mainly as dietary fiber were the major macronutrient (2.43 g/100 g fw), being the insoluble dietary fiber the predominant fraction (2.30 g/100 g). In addition, leaves of Beta vulgaris L. were especially rich in Mg, Fe and Ca (4.54, 2.94 and 2.28 mg/100 g fw) and very poor in Na (0.09 mg/100 g fw). Volatile profile revealed that non-terpene derivatives and sesquiterpene hydrocarbons were the essential classes of volatiles in the chard leaves. Myricitrin, p-cumaric acid and rosmarinic acid were characterized. Moreover, the ethanol extract of wild Swiss chard leaves revealed significant antioxidant capacity. Furthermore, a good enzyme inhibitory effects on α-glucosidase and α-amylase activities were observed. These findings highlighted the potential health benefits of wild Swiss Chard as a source of nutritional and bioactive compounds.


Assuntos
Beta vulgaris/química , Compostos Fitoquímicos/análise , Extratos Vegetais/análise , Folhas de Planta/química , Antioxidantes/análise , Carboidratos/análise , Fibras na Dieta , Inibidores Enzimáticos/análise , Ácidos Graxos/análise , Flavonoides/análise , Hidroxibenzoatos/análise , Hidroxibenzoatos/isolamento & purificação , Minerais/análise , Valor Nutritivo , Pigmentos Biológicos , Terpenos , Compostos Orgânicos Voláteis/análise , Compostos Orgânicos Voláteis/isolamento & purificação
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