Proceedings of the SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 2021 INTERNATIONAL VIRTUAL CONFERENCE最新文献

{"title":"UNILATERAL HYDRONEPHROSIS DUE TO URETER OBSTRUCTION AFTER OVARIO-HYSTERECTOMY IN A FELINE - CASE REPORT","authors":"Isabelle Medeiros Rodrigues, João Francisco Bianchini de Toledo, Thiago Abreu Saman, Mário dos Santos Filho","doi":"10.48141/sbjchem.21scon.34_abstract_rodrigues.pdf","DOIUrl":"https://doi.org/10.48141/sbjchem.21scon.34_abstract_rodrigues.pdf","url":null,"abstract":"Hydronephrosis is characterized by the renal pelvis and calyces distension resulting from total or partial urinary outflow obstruction. Ureter injuries are recognized complications of abdominal surgeries, especially sterilization, due to the frequency which they are performed in cats and dogs and the proximity between the ureter and the uterine stump. Some injuries may be acute or chronic, uni or bilaterally, affecting the urinary tract segment parts. Therefore, diagnosis is very important, especially early on, since it makes immediate management easier and may result in a better prognosis, especially when the disease course gets interrupted or its progression gets slowed. Furthermore, the importance of performing sporadic exams, even without previous clinical history for feline patients, is notorious since the nature of the species to hide clinical signs is well known. To certify the success of the surgery and integrity of the organs, it is very important to perform post sterilization exams. It is also crucial to state the importance of computed tomography for the diagnosis since some obstruction causes, such as blood clot, may not be shown in the ultrasound. Computed tomography is also necessary to differentiate hydronephrosis from many injuries that may affect the kidneys and ureters, like ectopic ureter, obstruction by calculi, and surgical ligature. The present study has the objective of reporting and discussing the laboratory, imaging findings, and clinical state of a patient with unilateral hydronephrosis, with asymptomatic evolution of iatrogenic origin due to obstruction by ureter obliteration after ovariohysterectomy (OVH).","PeriodicalId":20606,"journal":{"name":"Proceedings of the SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 2021 INTERNATIONAL VIRTUAL CONFERENCE","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82772912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EVALUATION OF THE EFFECTIVENESS OF TREATMENT OF THE ORAL MUCOSA WITH PHYTO-OINTMENT BASED ON PHYTOECDYSTEROIDS","authors":"A. Timoshin, A. Dorofeev, K. Ershov, Inna Pustokhina, E. Emelina","doi":"10.48141/sbjchem.21scon.09_abstract_timoshin.pdf","DOIUrl":"https://doi.org/10.48141/sbjchem.21scon.09_abstract_timoshin.pdf","url":null,"abstract":"An indicator of the health of the human body in the state of the oral mucosa. Mechanical and chemical factors constantly influence it. At the first stage of the study, a comparative analysis of the frequency of various forms of traumatic injuries of the oral mucosa was carried out. The distribution of patients into groups was also carried out, depending on the medicinal product used. Then clinical examinations were carried out. After that, the therapy of traumatic erosive and ulcerative lesions of the oral mucosa began. The developed method for treating traumatic lesions of the oral mucosa with medicine based on phytoecdysteroids provides for the elimination of the traumatic factor, applying ointment based on phytoecdysteroids to the dried out focus twice a day. The use of phyto-ointment leads to complete repair of traumatic erosive and ulcerative lesions of the oral mucosa on average by the eighth day from the start of treatment; a similar effect with the use of \"Solcoseryl dental adhesive paste\" is achieved by the tenth day, and the gel \"Cholisal Dental\" - at a later date, which is confirmed in this study. The most significant positive effect on the level of quality of life associated with the effectiveness of treatment of traumatic erosive and ulcerative lesions of the oral mucosa in comparison with the dental “Solcoseryl dental adhesive paste” and the gel “Cholisal Dental” is exerted by phyto-ointment, where a decrease in the total points was recorded. When conducting routine examinations of patients, it is necessary to pay attention to the oral mucosa damage. Moreover, in treating traumatic injuries of the oral mucosa, it is recommended to use phytoointment, which contains phytoecdysteroids.","PeriodicalId":20606,"journal":{"name":"Proceedings of the SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 2021 INTERNATIONAL VIRTUAL CONFERENCE","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84561631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"NOSOLOGICAL CHARACTERISTICS OF DOGS SUBMITTED TO TPLO BY AN ORTHOPEDIC SERVICE IN THE STATE OF RJ, BRAZIL","authors":"Andrei Ferreira Nicolau Costa, Eduardo Butturini de Carvalho, P. Motta, Lucas Baptista Motta, Amanda da Costa Rocha","doi":"10.48141/sbjchem.21scon.39_abstract_rocha.pdf","DOIUrl":"https://doi.org/10.48141/sbjchem.21scon.39_abstract_rocha.pdf","url":null,"abstract":"Cranial cruciate ligament rupture in dogs causes knee instability. It is one of the main causes of pelvic limb lameness in this species. There are several techniques for surgical treatment, and TPLO – tibial plateau leveling osteotomy aims to change the biomechanics of the knees in an attempt to better distribute the forces and generate dynamic stability in the joint. Still, little epidemiological data about dogs submitted to TPLO has been published. This retrospective study investigated nosological and epidemiological characteristics of 76 dogs submitted to this technique performed by a private orthopedic service in two cities in the state of Rio de Janeiro over fourteen months. The mean time between diagnosis and surgery was 23 days (median nine days). The mean age of the dogs was 73±43 months, and there were no differences between males and females. Approximately 10,5% of dogs had contralateral ligament rupture. Most animals were spayed or neutered (66,66% vs. 33,33%, p=0,02). There were no transpiratory complications in 89,6% of patients, and 79,2% had no postoperative complications. Exploratory arthrotomy was the most performed associated surgery technique (61% of patients). It is believed that studies like this allow a better understanding of this rupture and its treatment options, providing a better quality of life for affected dogs.","PeriodicalId":20606,"journal":{"name":"Proceedings of the SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 2021 INTERNATIONAL VIRTUAL CONFERENCE","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86909372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"RELEASE PROFILE OF BISPHENOL-A FROM DENTAL RESINS IN WATER ASSESSED BY LC-MS/MS","authors":"B. P. D. Silva, Gabriel Rübensam, Claudiela Wachholz Saafeld, J. Weber","doi":"10.48141/sbjchem.21scon.23_abstract_rubensan.pdf","DOIUrl":"https://doi.org/10.48141/sbjchem.21scon.23_abstract_rubensan.pdf","url":null,"abstract":"Dental resins have been designed to replace amalgam restorations due to their more favorable physical, chemical, and biological properties. However, depending on its composition, the efficiency of its polymerization, and the degradation of the polymer matrix, Bisphenol-A can be present and therefore released from this material to the human body. It has been reported that residues of additives and minority by-products of polymer reactions, such as Bisphenol-A, can be released from plastics into aqueous media through polymer hydration, water-polymer diffusion, residue dissolution, and equilibrium between dissolved residues in water and polymer. Over time, this could lead to a polymer material with an external layer practically free of Bisphenol-A. However, the newly formed layer could be removed by brushing during oral cleaning, similar to toothbrushing, exposing the new layer containing Bisphenol-A to the aqueous media. Due to the toxic effects of this compound, an increasing number of plastics labeled as BPA-free have been introduced to the dental market, including tooth coating, dental sealants, and resins. Nevertheless, more specific studies on analytical chemistry have revealed a trace of Bisphenol-A in dental resins labeled as BPA-free and pointed out the need for even more sensitive and accurate detection methods to help manufacturers evaluate the presence of background contaminations in their products and to avoid false-negative results. In this way, liquid chromatography-tandem mass spectrometry has been considered one of the most suitable methods for confirming Bisphenol-A even at low concentrations, in high complex matrices, due to its high select sensitivity. In the present work, we developed a sensitive, reliable, and efficient approach to trace the release profile of Bisphenol-A by LC-MS/MS in dental resin samples purchased in the Brazilian dental market. With the analysis of five different brands of resin composites performed in eight days of exposition to water, four of them released Bisphenol-A from 3.4 pg/mm2 to 10.1 ng/mm2. The brand labeled as BPA-free released BPA at concentrations of 1.1 ng/mm2. However, one sample reached the maximum of released BPA in only 3 days, one in 4 days, and two virtually did not reach a maximum of BPA released into the water in the window time assessed. Limits of detection and quantification of the LC-MS/MS method were 40 pg/mm2 and 100 pg/mm2, respectively, and allowed the quantification of BPA released from a composite labeled as BPA-free. For future analysis, we will conduct a more comprehensive study on the release profile of BPA from resin composites into the water using a tooth brushing simulator to determine if the obtained profiles might have clinical implications.","PeriodicalId":20606,"journal":{"name":"Proceedings of the SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 2021 INTERNATIONAL VIRTUAL CONFERENCE","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89479052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EVALUATION OF THE IMPORTANCE OF HOUSEHOLD ENVIRONMENTAL CHARACTERISTICS IN THE DEVELOPMENT OF CANINE VISCERAL LEISHMANIASIS","authors":"Amanda Alfeld Belegote, Lucas L. Ferreira, L. Silva, Stephanie Esteves Sant’ana DA SILVA, Glenda R. Oliveira","doi":"10.48141/sbjchem.21scon.31_abstract_belegote.pdf","DOIUrl":"https://doi.org/10.48141/sbjchem.21scon.31_abstract_belegote.pdf","url":null,"abstract":"Visceral leishmaniasis is a zoonosis of great importance due to its incidence and high lethality, and the dog as its main reservoir in urban centers. Furthermore, environmental characteristics such as soil with abundant organic matter can predispose local ecosystems to the development of the vector Lutzomyia longipalpis. This study aimed to carry out a data collection in partnership with the Health Department of the municipality of Vassouras, determining environmental characteristics and favorable means for the dissemination of the sand fly, in an area of 150 meters from a confirmed human case of leishmaniasis in the Itakamosi neighborhood. During the months of October and November 2021, an environmental study was carried out in 7 homes, where a total of 14 dogs lived. Through questionnaires, data were collected regarding the environmental conditions of these homes. It was observed that 100% of the animals lived in households close to the forest and vegetation. Of the 7 households analyzed (6/7), 85,71% had banana trees in their surroundings, followed by the presence of fruit trees, which corresponds to (5/7) 71,42% of households. In contrast, in (3/7), 42,83% and (2/7) 28,57% represent the number of houses with the presence of chicken coops and kennels, respectively. In contrast, in (1/7) 14,28% of the households, there was the presence of organic matter debris, aiding in the sand fly cycle. The animals residing in these houses were tested for leishmaniasis and showed a negative result, but the possibility of future infection of these animals cannot be ruled out, given that these factors corroborate the easy adaptation of the sandfly exploiting the accumulation of organic matter in areas of socioeconomic vulnerability.","PeriodicalId":20606,"journal":{"name":"Proceedings of the SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 2021 INTERNATIONAL VIRTUAL CONFERENCE","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90186963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TOTAL CONTENT OF CALCIUM AND PHOSPHORUS IN SERUM OF WISTAR RATS BY AN OPTIMIZED METHOD OF ICP-MS","authors":"V. Koth, Gabriel Rubensam, Bernardo Ottoni Braga Barreiro, Thaynã Spencer Stein, K. Cherubini","doi":"10.48141/sbjchem.21scon.27_abstract_koth.pdf","DOIUrl":"https://doi.org/10.48141/sbjchem.21scon.27_abstract_koth.pdf","url":null,"abstract":"In the Odontology field, the modeling process of alveolar bone has been a topic of investigation for the last years since the lost bone after tooth extraction can preclude aesthetic and function. In this practice, the volume of the tissue to be modeled depends on, among other factors, the serum levels of calcium and phosphorus, and it is of interest to monitor these elements to better understand the mechanism of tissue regeneration. These elements are routinely analyzed for clinical purposes, as serum constituents, by UV-VIS spectrophotometry after chromogenic reactions for each metal with different reagents. Depending on the analytical demands and work objectives, it is necessary to have methods based on technologies that allow multi-element quantification in a single experiment. In this context, ICP-MS has been considered a powerful tool for rapid multi-element analysis due to its high selectivity and sensitivity. However, it has been reported that samples with high content of salts and proteins, such as serum samples, cause matrix-induced interferences due to weak sample preparation and the presence of polyatomic ions. The present study aimed to identify and mitigate matrix effects in rat serum samples during the simultaneous quantification of calcium and phosphate using ICP-MS and evaluate its capability of differentiating element levels from Wistar rats subjected to tooth extraction with and without alveolar bone grafting. In addition, the optimized method can be used for more comprehensive mineralomics studies related to the bone modeling process in future studies.","PeriodicalId":20606,"journal":{"name":"Proceedings of the SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 2021 INTERNATIONAL VIRTUAL CONFERENCE","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82634673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"RELEVANCE OF THE HEALTH CONDITION AND CLINICAL CHARACTERISTICS OF SPOROTRICHOSIS","authors":"S. M. Rocha, Bruna Pereira, Emanuelle Silva Oliveira, Letícia Santos Junqueira, Glenda R. Oliveira","doi":"10.48141/sbjchem.21scon.41_abstract_rocha.pdf","DOIUrl":"https://doi.org/10.48141/sbjchem.21scon.41_abstract_rocha.pdf","url":null,"abstract":"Feline sporotrichosis is a zoonosis caused by S. brasiliensis, and it presents a degree of great underreporting due to its contamination. Caused by inoculation directly into the skin, in most cases through scratches or bites by infected animals. With its first diagnosis in 1907 among naturally infected mice. The study presents information on the health of the animal, composed of 24 felines of both sexes, obtaining information through questionnaires about food along with vaccination, deworming, and ectoparasites control. In addition to depicting the types of injuries and body parts such as head, limbs, and trunk. Seeking to provide important information about animal health, along with the follow-up of a Veterinary Doctor. General care that meets the health of no animal meets all care. The disease may present some systemic symptoms such as secretions, anorexia, apathy, difficulty breathing, fever, ulcers, and abscesses. In the study, 4% of the cats had a respiratory clinical picture. Regarding the lesions, it was mostly noted that 96% of the felines had multiple lesions and 4% had single lesions in the areas of the body, being 67% of secretion with pure bloody characteristics and 33% had no secretions, with the main sites of involvement being 58% in the head region, 36% in the limbs and 6% in the trunk. Factors related to feline immunocompromise may result in more severe cases of sporotrichosis as observed in the study animals. All information obtained was evaluated using basic descriptive statistics. Relative frequency values and percentage values were assigned to the variables observed in the research.","PeriodicalId":20606,"journal":{"name":"Proceedings of the SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 2021 INTERNATIONAL VIRTUAL CONFERENCE","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83308278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"POISONING BY HOUSEHOLD CHEMICALS IN CHILDREN","authors":"M. C. C. Souza, Renan Lopes Fernandes, Cristina Fidalgo Affonso Pinheiro","doi":"10.48141/sbjchem.21scon.36_abstract_fernandes.pdf","DOIUrl":"https://doi.org/10.48141/sbjchem.21scon.36_abstract_fernandes.pdf","url":null,"abstract":"Children are the main victims of intoxication, considering that, with child development, especially between one and four years of age, they learn to walk and acquire agility, reaching objects and bringing them to the mouth. The objective of this study was to review the literature on exogenous intoxications by chemical products used in households in children in Brazil. Household cleaning products are the second leading cause of poisoning in domestic environments, preceded only by the accidental ingestion of medication. From 2017 to 2021, 128,794 exogenous intoxications resulting from exposure to toxic agents were recorded in the age group from zero to 14 years in Brazil. Among this total of exogenous intoxications, 18,733 reports of poisoning by household products were registered, representing 14.54% of the total of exogenous intoxications. Intoxication records in Brazil increased by up to 23%, from January to April 2021, compared to the same period in 2019. This is because the world is facing the COVID-19 pandemic, in which hygiene products are being commercialized for cleaning and antisepsis of domestic environments, which led to an intensification of accidents caused by these chemical materials. Therefore, it is concluded that the rate of exogenous intoxication by domestic chemical products is high in children, especially in the age group of zero to five years. It is also worth mentioning that with the COVID-19 pandemic, there was a greater consumption of chemical products for domestic use and, consequently, an increase in the number of poisonings by these products in children. Therefore, it is evident the need to adopt actions to avoid these accidents to reduce the poisoning rate by these toxic agents.","PeriodicalId":20606,"journal":{"name":"Proceedings of the SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 2021 INTERNATIONAL VIRTUAL CONFERENCE","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79040483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"BIOPOLYMERS AS DOSIMETERS - A PROPOSAL","authors":"R. F. Gennari, Gilson Goveia, J. Chubaci","doi":"10.48141/sbjchem.21scon.42_abstract_gennari.pdf","DOIUrl":"https://doi.org/10.48141/sbjchem.21scon.42_abstract_gennari.pdf","url":null,"abstract":"The radiation study has led to advances in various areas of our everyday lives despite that several events had occurred, causing health damage to several researchers. Thus, if somebody wants to study irradiation effects on materials must use equipment that quantifies the radiation received. Dosimeters do this quantification of ionizing radiation. There are numerous applications for ionizing radiation so far, and many materials can be used for dosimetric purposes. Despite that, there is always a constant search for new materials, focusing on more efficient processes or less environmental impact. For dosimetric purposes, the material has to be radiation sensitive. Many materials have been the subject of research recently, aiming to be environment friendly: among them, we can mention biopolymers that have the great advantage of being biodegradable. A commercial solid-state dosimeter uses silver-activated phosphate glass for radiophotoluminescence (RPL) purposes. This dosimeter has an enormous advantage since it does not lose the dose information after dose reading. It can be reread many times until annealing is done to reset the exposure condition. It can be reused several times. This dosimeter is commercially available as “GD-450” (Chiyoda Technol Corporation). Our research group successfully proposed using silicate glass instead of phosphate glass as RPL dosimeters. Face to the need for a high-temperature furnace for glass sintering, and it was decided to test biopolymers as RPL dosimeters. Once our goal was to have a regenerative dosimeter, we used silver as a sensible radiation element. This work it was synthesized two biopolymers with and without adding silver to them. The biopolymers synthesized used starch and collagen as polymer base material. The biopolymers analysis was done by microscopy and by optical spectrometry (UV-Vis-NIR). We observed irradiation effects on absorption bands from biopolymer of collagen doped with silver.","PeriodicalId":20606,"journal":{"name":"Proceedings of the SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 2021 INTERNATIONAL VIRTUAL CONFERENCE","volume":"76 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87050167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THE EFFECTS OF PARTICLE SIZE, COMPACTION PRESSURE, AND TORREFACTION ON QUALITY AND THERMAL PROPERTIES OF PELLETIZED CORNCOB RESIDUES","authors":"Nurudeen Sabi Saidu, Muhammad Alamin Aladodo, H. A. Ajimotokan","doi":"10.48141/sbjchem.21scon.14_abstract_saidu.pdf","DOIUrl":"https://doi.org/10.48141/sbjchem.21scon.14_abstract_saidu.pdf","url":null,"abstract":"Torrefaction and biomass pelletization into pellets for solid fuel development are considered sustainable energy solutions to mitigate fossil fuel dependency and environmental challenges. This study investigated the effect of particle size, compaction pressure, and torrefaction on the quality and thermal properties of pelletized corncob residues. The corncob samples were collected, sorted, and pulverized before the torrefaction pretreatment. The torrefaction was achieved by placing the corncob in a furnace at a temperature and residence time of 280 °C and 30 minutes, respectively. The inert atmosphere was attained and maintained by initially purging a nitrogen gas into the torrefying chamber and passing it at 100mL/min during the processes. The raw and torrefied corncob fines were screened to 0.3 mm, 0.5 mm, and 1.0 mm grain sizes. Using starch as a binder (5% wt), pellets were produced employing their respective raw and torrefied fines at compaction pressures of 50 MPa, 75 MPa, and 100 MPa. Though all pellet samples exhibited good quality and thermal properties, the pellets from torrefied corncob are better. Also, the effects of particle size and compaction pressure are significant on the produced pellets. The compressed density varied from 760 to 1,250 kg/m3 and 637 to 920 kg/m3 for raw and torrefied corncob pellets. A maximum heating value of 25.8 MJ/kg was obtained from the torrefied pellet sample of 1.0 mm, rendering improvements of 37.2% when compared with 18.8 MJ/kg of raw corncob of the same particle size. The energy values obtained for torrefied corncob for all particle sizes compared favorably with the value obtained in coal. Investigation of particle size, compaction pressure, and torrefaction on quality and thermal properties of pelletized corncob residue proved that it can replace coal and hence could be used for energy applications.","PeriodicalId":20606,"journal":{"name":"Proceedings of the SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 2021 INTERNATIONAL VIRTUAL CONFERENCE","volume":"251 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78182720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}