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Experimental Study of the Influence of Intrinsic Parameters on the Thermal Reactivity of Sawdust, Polyethylene Terephthalate and Composite

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Journal of Materials Science and Chemical Engineering 2024年第3期12卷 9-20页

作者： Ange Brel Boukongou timoléon andzi barhé Applied Chemistry Research Laboratory (LARCA) Ecole Normale Supérieure (ENS) Marien NGOUABI University (UMNG) Brazzaville Congo

Several works have been based on the study of thermal variations in biomass to derive more valuable products such as fuels capable of replacing oil in the event of a crisis or activated carbon used as an adsorbent material, widely used in industry for the elimination of unwanted materials, both in liquid and gaseous environments. A study of thermal parameters such as: heating speed, retention time, drying temperature, carbonization temperature, particle size, was carried out with the aim of determining the characteristic factors of the carbonization of Polyethylene terephthalate (PET), sawdust (SC) and sawdust/polyethylene terephthalate (CPS) mixture. The results of the immediate analysis revealed a very low level of ash in PET (0.013%) compared to the level of ash in sawdust (2.9%), as well as a high level of fixed carbon (82.960%), which suggests the presence of mineral oxides and a significant carbon matrix unlike PET, which indicates a very significant organic matrix (essentially made up of organic matter) with the absence of mineral oxides. The study of thermal parameters showed the water loss from Sawdust (SC) and the Sawdust/Polyethylene terephthalate (CPS) mixture, an increase with temperature, unlike that of PET whose variation is essentially zero. Without heat treatment, sawdust alone contains approximately 7% water. The optimal drying temperature for this study is 110˚C for a stay of 24 hours. It appears that the largest mass losses for the PET samples are between 87.19% and 96.05%, followed by that of the mixture, between 47.33% and 64.37%. And the lowest are observed, those of sawdust (from 24.02% to 62.6%). However, here we can say that the influence of the mass is not great, given the slight difference between the losses by temperature. The results of the study of the influence of grain size showed that the differences are insignificant, even if we vary the diameter of the grains from simple to triple. To better minimize physical constraints such as t

关键词： Intrinsic Parameters Thermal Reactivity Sawdust Polyethylene Terephthalate Composite

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Chemical Characterization and Anti-Radical Activity of Fruits and Vegetables Commonly Consumed in Brazzaville

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Food and Nutrition Sciences 2020年第8期11卷 773-788页

作者： Gouollaly Tsiba Josiane Enzonga Yoca Mboungou-Bouesse Blondy andzi-barhe Thimoleon et Pascal Ongoka Institut National de Recherche en Sciences de la Santé (IRSSA) Département de la Pharmacopée et Médecine Traditionnelle Laboratoire de Chimie des Biomolécules organiques et de Pharmacodynamie. Cité Scientifique (Ex-ORSTOM) Brazzaville Congo Université Marien Ngouabi-Faculté des Sciences et Techniques Parcours Chimie Brazzaville Congo Laboratoire de Contrô le et Qualité des aliments de l’Ecole Nationale Supérieure d’Agronomie et de Foresterie Université Marien NGOUABI Brazzaville Congo Université Marien Ngouabi-Ecole Normale Supérieure-Parcours Sciences Exactes Brazzaville Congo

The objective of this study was to analyze ten (10) species of edible vegetables and nine (9) fruit commonly found in Congo (Brazzaville) in order to determine their total polyphenol content (TPC) and total flavonoid content (TFC), and their antiradical activity by the method of 1,1-diphenyl-2-picrylhydrazyl (DPPH). The results obtained showed that the highest TPC and TFC were found, on the one hand, in the extracts of four species of vegetables, i.e. Ipomoea batatas L. (536.02 ± 0.01 mg of GAE/100 g DW;486.46 ± 0.10 mg of QtE/100 g DW), Cucurbita pepo (533.60 ± 0.05 mg of GAE/100 g DW;303.72 ± 0 mg of QtE/100 g DW), Hibiscus sabdariffa (421.02 ± 0.015 mg of GAE/100 g DW;243.49 ± 0.10 mg of QtE/100 g DW

关键词： Fruit Vegetables Polyphenols Flavonoid Antiradical Activity

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Charactistics of Anemia in Cirrhotics in the Gastroenterology Department at Brazzaville University Hospital

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Open Journal of Gastroenterology 2024年第11期14卷 402-413页

作者： Clausina Mikolélé Ahoui Apendi Daulores Sylavnie Abena Ebembe Ngala Akoa Itoua-Ngaporo Jenny Carmela Angala andzi Arnaud Mongo-Onkouo Jile Florient Mimiesse Monamou Rody Stéphane Ngami Mardochée Motoula Latou Marlyse Ngalessami Mouakosso Céline Sandra Adoua Deby Gassaye Blaise Irenée Atipo Ibara Department of Gastroenterology and Internal Medicine Brazzaville University Hospital Brazzaville Republic of the Congo Faculty of Health Sciences Marien Ngouabi University Brazzaville Republic of the Congo

Objective: Study of the frequency of anemia, its characteristics and its relationship with different epidemiological, diagnostic and prognostic parameters of cirrhosis. Patients and methods: This was a retrospective descriptive study from January 2016 to December 2019 in the Gastroenterology and Internal Medicine department at the Brazzaville University Hospital. It concerned all cirrhotics hospitalized during the study period and presenting anemia. The epidemiological, diagnostic, and prognostic data studied were collected from medical records. The characteristics of anemia on the blood count were defined based on WHO values. The information collected was entered and processed with Excel 8.0 and EPI data 3.1 software. The Pearson chi2 test at the significance level ≤ 5% was used to compare the results. Results: We collected 102 files of cirrhotic patients during the study period. There were 63 men and 39 women, a sex ratio of 1.6. Among these patients, 77 presented anemia, i.e., a frequency of 75.5% with a male predominance (57.2%). Anemia increased without a significant relationship with age and was more severe in young female subjects (42.8%). The normochromic normocytic character was the most observed (52%). Anemia was more frequent in post-hepatitic cirrhosis, representing 67.5% of cases of anemia. It worsened during digestive bleeding, with the abundance of ascites and the severity of hepatic encephalopathy (p > 0.05). It was significantly associated with the drop in prothrombin level (63.6%), hypoalbuminemia (64.9%), and the Child-Pugh score (p < 0.05).

关键词： Anemia Cirrhosis CHU Brazzaville

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