Pub Date : 2023-06-30DOI: 10.53848/ssstj.v10i2.491
Piyapon Permpoontanalap, W. Lerdwijitjarud
Bio-based materials have received more attention to replace materials from petroleum resources because of sustainability reason. Plant oil is one of the most interesting raw materials to produce thermosetting polymer. A crosslinking reaction between epoxidized linseed oil and vegetable oil-based crosslinkers is investigated in present study. Two types of crosslinker including fatty acid dimer and fatty acid trimer were reacted with epoxidized linseed oil. A rotational rheometer equipped with cone-and-plate geometry was used to monitor the progress of three-dimensional network formation. A curing phenomenon was illustrated by the increment in storage modulus of the reaction mixture. The trifunctional crosslinker was more effective than difunctional crosslinker for an uncatalyzed systems at the reaction temperature of 120 OC. When the crosslinking temperature of trimer-crosslinker system increased from 120 OC to 140 OC, the induction time for curing decreased around three times. The reaction between epoxidized oil and trimer acid was obviously accelerated by using 4-methyl amino pyridine as a catalyst. Increasing the catalyst content induced a monotonically reduction in induction time of curing process. The induction time of the reaction between epoxidized linseed oil and trimer acid with 2% catalyst at reaction temperature of 120 OC was only 18 minutes, which was significantly shorter than that of an uncatalyzed systems around seven times.
{"title":"Effect of Preparation Conditions on Crosslinking Behavior of Linseed Oil-Based Thermosetting Polymer","authors":"Piyapon Permpoontanalap, W. Lerdwijitjarud","doi":"10.53848/ssstj.v10i2.491","DOIUrl":"https://doi.org/10.53848/ssstj.v10i2.491","url":null,"abstract":"Bio-based materials have received more attention to replace materials from petroleum resources because of sustainability reason. Plant oil is one of the most interesting raw materials to produce thermosetting polymer. A crosslinking reaction between epoxidized linseed oil and vegetable oil-based crosslinkers is investigated in present study. Two types of crosslinker including fatty acid dimer and fatty acid trimer were reacted with epoxidized linseed oil. A rotational rheometer equipped with cone-and-plate geometry was used to monitor the progress of three-dimensional network formation. A curing phenomenon was illustrated by the increment in storage modulus of the reaction mixture. The trifunctional crosslinker was more effective than difunctional crosslinker for an uncatalyzed systems at the reaction temperature of 120 OC. When the crosslinking temperature of trimer-crosslinker system increased from 120 OC to 140 OC, the induction time for curing decreased around three times. The reaction between epoxidized oil and trimer acid was obviously accelerated by using 4-methyl amino pyridine as a catalyst. Increasing the catalyst content induced a monotonically reduction in induction time of curing process. The induction time of the reaction between epoxidized linseed oil and trimer acid with 2% catalyst at reaction temperature of 120 OC was only 18 minutes, which was significantly shorter than that of an uncatalyzed systems around seven times.","PeriodicalId":31349,"journal":{"name":"Suan Sunandha Rajabhat University Journal of Science and Technology","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83487275","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}
Pub Date : 2023-06-30DOI: 10.53848/ssstj.v10i2.390
Agnes Sri Mulyani
The Sea Surface Temperature (SST) is an important parameter for climate dynamic issues either globally or regionally as well as for global warming issues. In some condition the parameter can cause melting glaciers that will influence the rise of the sea levels. The further effect will be the climate change with the weather phenomena such as storms, hurricanes and heavy rains. As the result, the changes of the planting seasons occur and all of these will harm human life on earth. If there is no prevention with the condition of the parameter it is predicted that by 2040 the sea levels will rise highly because of the melting polar ice caps that will cause the sink of theislands. The SST has been detecting using remote sensing methods for 32 years in Indonesia. The trend has increased to reduce the damage of infrastructure and the activity disturbance of coastal communities. Indonesian country optimistically commits to achieve the target of net zero emission by 2060. The Indonesian government has stated nationally the climate target commitments determined for Indonesia and will strive to maintain the main target of reducing greenhouse gas emission into 41% by 2030.
{"title":"Literature Study on Conditions of Sea Surface Temperature and Seawater Rise in Indonesia Detected by Remote Sensing","authors":"Agnes Sri Mulyani","doi":"10.53848/ssstj.v10i2.390","DOIUrl":"https://doi.org/10.53848/ssstj.v10i2.390","url":null,"abstract":"The Sea Surface Temperature (SST) is an important parameter for climate dynamic issues either globally or regionally as well as for global warming issues. In some condition the parameter can cause melting glaciers that will influence the rise of the sea levels. The further effect will be the climate change with the weather phenomena such as storms, hurricanes and heavy rains. As the result, the changes of the planting seasons occur and all of these will harm human life on earth. If there is no prevention with the condition of the parameter it is predicted that by 2040 the sea levels will rise highly because of the melting polar ice caps that will cause the sink of theislands. The SST has been detecting using remote sensing methods for 32 years in Indonesia. The trend has increased to reduce the damage of infrastructure and the activity disturbance of coastal communities. Indonesian country optimistically commits to achieve the target of net zero emission by 2060. The Indonesian government has stated nationally the climate target commitments determined for Indonesia and will strive to maintain the main target of reducing greenhouse gas emission into 41% by 2030.","PeriodicalId":31349,"journal":{"name":"Suan Sunandha Rajabhat University Journal of Science and Technology","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85104818","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}
Pub Date : 2023-06-30DOI: 10.53848/ssstj.v10i2.239
Sadeka Sultana Rubai, Santunu Purohit, T. Siddiqua, Md. Shakilur Rahman, A. Meaze
Analytic radiography is a normal image testing technique which has been utilized for quite a long time. It is recommended by specialists so they can identify any problem in patients' bodies without a cut. Thinking about its wide use, the principle objective of this investigation is to give a top notch picture by keeping the radiation portion as low as conceivable through identifying any variety in quality control (QC) boundaries. In this work, some standard quality control boundaries, for example, voltage exactness, time precision test, tube yield linearity, half value layer (HVL) of x-beam were measured. These quality control (QC) boundaries were estimated by a dosimeter keeping a distance of 100 cm from source. The voltage precision went from 0.31% to 4.67% and the time exactness test went from 0% to 2.29%. The consequences of this investigation show that all the QC boundaries are inside the acceptable level which guarantees the advancement of the low portion conveyed to the patients.
{"title":"Investigation of some regular x-ray imaging parameters in suggestive radiography of four hospitals in Bangladesh","authors":"Sadeka Sultana Rubai, Santunu Purohit, T. Siddiqua, Md. Shakilur Rahman, A. Meaze","doi":"10.53848/ssstj.v10i2.239","DOIUrl":"https://doi.org/10.53848/ssstj.v10i2.239","url":null,"abstract":"Analytic radiography is a normal image testing technique which has been utilized for quite a long time. It is recommended by specialists so they can identify any problem in patients' bodies without a cut. Thinking about its wide use, the principle objective of this investigation is to give a top notch picture by keeping the radiation portion as low as conceivable through identifying any variety in quality control (QC) boundaries. In this work, some standard quality control boundaries, for example, voltage exactness, time precision test, tube yield linearity, half value layer (HVL) of x-beam were measured. These quality control (QC) boundaries were estimated by a dosimeter keeping a distance of 100 cm from source. The voltage precision went from 0.31% to 4.67% and the time exactness test went from 0% to 2.29%. The consequences of this investigation show that all the QC boundaries are inside the acceptable level which guarantees the advancement of the low portion conveyed to the patients.","PeriodicalId":31349,"journal":{"name":"Suan Sunandha Rajabhat University Journal of Science and Technology","volume":"148 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76749672","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}
Pub Date : 2023-06-29DOI: 10.53848/ssstj.v10i2.278
Thanh Nguyen Trung
This article presents the effect of Tinuvin 292 (a light stabilizer based on liquid hindered amine) on properties of chlorinated rubber varnish/coating under 100 UV-thermo-humidity complex cycles. The properties included relative hardness, adhesion, flexural strength, impact resistance, and gloss loss. The results showed that 2.5 weight percent (wt%) of Tinuvin 292 had much improved physical properties of varnish coating such as relative hardness, adhesion, flexural strength, impact resistance, and gloss loss. Fourier-transform infrared spectroscopy (FT-IR),Thermogravimetric analysis (TGA), and Field Emission Scanning Electron Microscopy (FESEM) were used to evaluate the changes of aged coatings in comparison to the initial ones. FT-IR spectrums also showed that intensities of CH2 and C=O (ester) groups changed strongly or slightly depending on the appearance of Tinuvin 292. SEM images indicated that the surface of aged coating with Tinuvin 292 was smoother than coating without Tinuvin 292. TGA also expressed that thermal oxidation stability of chlorinated rubber varnish/ coating had been enhanced with 2.5 wt% of Tinuvin 292.
{"title":"Influence of Tinuvin 292 on Chlorinated Rubber Varnish/ Coating Properties under UV Radiation","authors":"Thanh Nguyen Trung","doi":"10.53848/ssstj.v10i2.278","DOIUrl":"https://doi.org/10.53848/ssstj.v10i2.278","url":null,"abstract":"This article presents the effect of Tinuvin 292 (a light stabilizer based on liquid hindered amine) on properties of chlorinated rubber varnish/coating under 100 UV-thermo-humidity complex cycles. The properties included relative hardness, adhesion, flexural strength, impact resistance, and gloss loss. The results showed that 2.5 weight percent (wt%) of Tinuvin 292 had much improved physical properties of varnish coating such as relative hardness, adhesion, flexural strength, impact resistance, and gloss loss. Fourier-transform infrared spectroscopy (FT-IR),Thermogravimetric analysis (TGA), and Field Emission Scanning Electron Microscopy (FESEM) were used to evaluate the changes of aged coatings in comparison to the initial ones. FT-IR spectrums also showed that intensities of CH2 and C=O (ester) groups changed strongly or slightly depending on the appearance of Tinuvin 292. SEM images indicated that the surface of aged coating with Tinuvin 292 was smoother than coating without Tinuvin 292. TGA also expressed that thermal oxidation stability of chlorinated rubber varnish/ coating had been enhanced with 2.5 wt% of Tinuvin 292.","PeriodicalId":31349,"journal":{"name":"Suan Sunandha Rajabhat University Journal of Science and Technology","volume":"234 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77072562","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}
Pub Date : 2023-06-29DOI: 10.53848/ssstj.v10i2.473
Chukwu Alexander Timothy, E. Okrikata, J. Tidi
Knowledge of successional colonization of cadaver is important in medico-legal studies especially with regards to postmortem interval (PMI) estimation. Paucity of data especially as it relates to juveniles has limited the appropriate application of this knowledge for the benefit of man. To bridge this knowledge gap, juvenile human cadaver was modeled using 2 slaughtered juvenile pigs – Sus scrofa Linn. (≈ 10 kg mean weight) at the study site. One pig was exposed to sunlight while the other shaded under a tree. Both pigs were protected from scavengers and allowed through the decay stages and sampling for adult arthropods continued till the dry-remainstage of decomposition. Data collected were used to compute frequency of occurrence and relative abundance. Paleontological Statistical Tool (Past3) was used to compute diversity indices. Of the 2032 arthropods of 20 species, across 17 families retrieved, the exposed carcass attracted 44.1% comprising 16 species within 15 families while the shaded carcass attracted 14 species within 12 families. Over 50% species similarity on the contrasting carcasses was observed. Calliphoridae, Muscidae, Dermestidae, Histeridae and Formicidae made-up the dominant families sampled. While Musca domestica L. (Muscidae) and Anochetus sp. (Formicidae) wereexclusively dominant for the shaded carcass, Crematogaster sp. (Formicidae) was exclusively dominant for the exposed carcass. Both carcasses completed decomposition in 14 days but exhibited a shorter advanced-decay stage for the shaded carcass and shorter dry remain stage for the exposed carcass. We thus conclude that, there was little distinction in the diversity and succession pattern of the arthropods colonizing both carcasses (shaded and exposed).
{"title":"Impact of Exposure Status on the Diversity and Successional Pattern of Cadaverous Arthropods on Slaughtered Juvenile Pig (Sus scrofa Linn.) Carcasses in Wukari, Nigeria","authors":"Chukwu Alexander Timothy, E. Okrikata, J. Tidi","doi":"10.53848/ssstj.v10i2.473","DOIUrl":"https://doi.org/10.53848/ssstj.v10i2.473","url":null,"abstract":"Knowledge of successional colonization of cadaver is important in medico-legal studies especially with regards to postmortem interval (PMI) estimation. Paucity of data especially as it relates to juveniles has limited the appropriate application of this knowledge for the benefit of man. To bridge this knowledge gap, juvenile human cadaver was modeled using 2 slaughtered juvenile pigs – Sus scrofa Linn. (≈ 10 kg mean weight) at the study site. One pig was exposed to sunlight while the other shaded under a tree. Both pigs were protected from scavengers and allowed through the decay stages and sampling for adult arthropods continued till the dry-remainstage of decomposition. Data collected were used to compute frequency of occurrence and relative abundance. Paleontological Statistical Tool (Past3) was used to compute diversity indices. Of the 2032 arthropods of 20 species, across 17 families retrieved, the exposed carcass attracted 44.1% comprising 16 species within 15 families while the shaded carcass attracted 14 species within 12 families. Over 50% species similarity on the contrasting carcasses was observed. Calliphoridae, Muscidae, Dermestidae, Histeridae and Formicidae made-up the dominant families sampled. While Musca domestica L. (Muscidae) and Anochetus sp. (Formicidae) wereexclusively dominant for the shaded carcass, Crematogaster sp. (Formicidae) was exclusively dominant for the exposed carcass. Both carcasses completed decomposition in 14 days but exhibited a shorter advanced-decay stage for the shaded carcass and shorter dry remain stage for the exposed carcass. We thus conclude that, there was little distinction in the diversity and succession pattern of the arthropods colonizing both carcasses (shaded and exposed).","PeriodicalId":31349,"journal":{"name":"Suan Sunandha Rajabhat University Journal of Science and Technology","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77080366","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}
Pub Date : 2023-01-06DOI: 10.53848/ssstj.v10i1.429
Kisun Chunti, Parinya Chakartnarodom, P. Sonprasarn, W. Prakaypan, Edward A. Laitila, S. Polsilapa
The performance of cement mortar can be improved with additives based on waste by-products. Synthetic zeolite polymer composites (referred as SZPC) produced from the combination of solid waste ashes with a selective acrylic compound was used as a cement mortar additive. The effect of SZPC as an additive on hydration reaction of ordinary Portland cement (referred as OPC) at different amounts of SZPC, from 1-4% of OPC weight, as well as microstructure and mechanical behavior of the cement mortar are determined. The results from the hydration reaction rate test showed that the optimum amount of SZPC as the additive was 2% of OPC weight. Compressive strength and flexural strength of the cement mortar after 1, 7, 14 and 28 days of curing increased, with the largestincreases at the early stage. Additions of SZPC, synthesized by a waste by-product, improved mechanical behavior of cement mortars supporting sustainable development and the circular economy.
{"title":"Mechanical Properties Enhancement of the Cement Mortar by Synthetic Zeolite Polymer Composites","authors":"Kisun Chunti, Parinya Chakartnarodom, P. Sonprasarn, W. Prakaypan, Edward A. Laitila, S. Polsilapa","doi":"10.53848/ssstj.v10i1.429","DOIUrl":"https://doi.org/10.53848/ssstj.v10i1.429","url":null,"abstract":"The performance of cement mortar can be improved with additives based on waste by-products. Synthetic zeolite polymer composites (referred as SZPC) produced from the combination of solid waste ashes with a selective acrylic compound was used as a cement mortar additive. The effect of SZPC as an additive on hydration reaction of ordinary Portland cement (referred as OPC) at different amounts of SZPC, from 1-4% of OPC weight, as well as microstructure and mechanical behavior of the cement mortar are determined. The results from the hydration reaction rate test showed that the optimum amount of SZPC as the additive was 2% of OPC weight. Compressive strength and flexural strength of the cement mortar after 1, 7, 14 and 28 days of curing increased, with the largestincreases at the early stage. Additions of SZPC, synthesized by a waste by-product, improved mechanical behavior of cement mortars supporting sustainable development and the circular economy.","PeriodicalId":31349,"journal":{"name":"Suan Sunandha Rajabhat University Journal of Science and Technology","volume":"82 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87560469","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}
Pub Date : 2023-01-06DOI: 10.53848/ssstj.v10i1.430
Juthamat Nithipaiboon, W. Prakaypan, Parinya Chakartnarodom, Edward A. Laitila, N. Kongkajun
A hybrid-aluminum additive (HAA) synthesized from industrial wastes including aluminum dross and flue gas desulfurized (FGD) gypsum was used as an additive for fiber-reinforced cement composites (FRCC). The impact of this additive on hydration kinetics was observed by the temperature change over time for the various HAA mixtures with ordinary Portland cement (OPC), sand, cellulose fibers, polyvinyl alcohol (PVA) fibers, and water, based on the method described in ASTM C186-98. The results showed that the hydration kinetics of OPC in the FRCC was improved by using HAA. In addition, when the amount of HAA was at 3% of the OPC weight, the hydration reaction rate was improved by 41%. The HAA additive acted as an accelerating agent by shortening the setting time and enhancing the temperature of the hydration reaction. This suggests that the cement paste can set faster, reducing the cycle time in FRCC processing. Even though further addition of the HAA increased the reaction rate, the setting time of OPC was too short to form a green sheet for the actual production of FRCC on an industrial scale. In addition, the heat released during the test, representing by the temperature change of the sample, was too high which could have a negative impact on the finished FRCC products.
{"title":"Impact of the Hybrid-Aluminum Additive on the Hydration Kinetics of Portland Cement in Fiber-Reinforced Cement Composites","authors":"Juthamat Nithipaiboon, W. Prakaypan, Parinya Chakartnarodom, Edward A. Laitila, N. Kongkajun","doi":"10.53848/ssstj.v10i1.430","DOIUrl":"https://doi.org/10.53848/ssstj.v10i1.430","url":null,"abstract":"A hybrid-aluminum additive (HAA) synthesized from industrial wastes including aluminum dross and flue gas desulfurized (FGD) gypsum was used as an additive for fiber-reinforced cement composites (FRCC). The impact of this additive on hydration kinetics was observed by the temperature change over time for the various HAA mixtures with ordinary Portland cement (OPC), sand, cellulose fibers, polyvinyl alcohol (PVA) fibers, and water, based on the method described in ASTM C186-98. The results showed that the hydration kinetics of OPC in the FRCC was improved by using HAA. In addition, when the amount of HAA was at 3% of the OPC weight, the hydration reaction rate was improved by 41%. The HAA additive acted as an accelerating agent by shortening the setting time and enhancing the temperature of the hydration reaction. This suggests that the cement paste can set faster, reducing the cycle time in FRCC processing. Even though further addition of the HAA increased the reaction rate, the setting time of OPC was too short to form a green sheet for the actual production of FRCC on an industrial scale. In addition, the heat released during the test, representing by the temperature change of the sample, was too high which could have a negative impact on the finished FRCC products.","PeriodicalId":31349,"journal":{"name":"Suan Sunandha Rajabhat University Journal of Science and Technology","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84831214","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}
Pub Date : 2023-01-04DOI: 10.53848/ssstj.v10i1.428
Pornpimon Soodsawaeng, Nanticha Rattanamangkalanon, T. Boonthai, V. Vuthiphandchai, S. Nimrat
Food safety of seafood-based products has become an important health threat in Thailand. Simultaneously, potential hazards posed by the use of chemical preservatives have prompted the advent of alternative technologies. Bacteria-derived substances have attracted interest as biopreservative to respond to health conscious demand of consumers. In order to enhance biosafety quality from a farm to fork cycle of traditional seafood products, bacteriological assessment during multiple steps related to preparation of dried, seasoned and crushed squids was conducted. Total viable counts (TVC) in the ranges of 102 - 103 CFU/g were observed across a series of thepreparation from rinsing to 2nd sun-dry phases. Homemade seasoning sauce composed mainly of Thai spices and flavoring was the common source of spoilage bacteria supported by the highest TVC population and diversity. Three bacterial genera belonging to Bacillus, Kocuria and Staphylococcus existed predominantly in the prepared squids. In the subsequent phase of study, antibacterial potential, and mode of action of a semi-purified solution containing bacteriocin from B. velezensis BUU004 (SPS-BV) against pathogenic B. cereus were investigated. The SPS-BV (800 AU/mL) exhibited strong bactericidal activity towards B. cereus through cell lysis. Lastly, biopreservative potential of the SPS-BV was evaluated in the post-prepared dried squids during 28-day storage atroom temperature. The SPS-BV was as effective as commercial nisin for controlling food spoilage bacteria along with significant reductions in moisture content and aw of dried squids during storage. This study confirms the biopreservative potential of the SPS-BV in dried seafood products in Thailand.
{"title":"Bacteriocin from Bacillus velezensis BUU004 as a Seafood Preservative: Antibacterial Potential, and Physical and Chemical Qualities of Dried, Seasoned, and Crushed Squids","authors":"Pornpimon Soodsawaeng, Nanticha Rattanamangkalanon, T. Boonthai, V. Vuthiphandchai, S. Nimrat","doi":"10.53848/ssstj.v10i1.428","DOIUrl":"https://doi.org/10.53848/ssstj.v10i1.428","url":null,"abstract":"Food safety of seafood-based products has become an important health threat in Thailand. Simultaneously, potential hazards posed by the use of chemical preservatives have prompted the advent of alternative technologies. Bacteria-derived substances have attracted interest as biopreservative to respond to health conscious demand of consumers. In order to enhance biosafety quality from a farm to fork cycle of traditional seafood products, bacteriological assessment during multiple steps related to preparation of dried, seasoned and crushed squids was conducted. Total viable counts (TVC) in the ranges of 102 - 103 CFU/g were observed across a series of thepreparation from rinsing to 2nd sun-dry phases. Homemade seasoning sauce composed mainly of Thai spices and flavoring was the common source of spoilage bacteria supported by the highest TVC population and diversity. Three bacterial genera belonging to Bacillus, Kocuria and Staphylococcus existed predominantly in the prepared squids. In the subsequent phase of study, antibacterial potential, and mode of action of a semi-purified solution containing bacteriocin from B. velezensis BUU004 (SPS-BV) against pathogenic B. cereus were investigated. The SPS-BV (800 AU/mL) exhibited strong bactericidal activity towards B. cereus through cell lysis. Lastly, biopreservative potential of the SPS-BV was evaluated in the post-prepared dried squids during 28-day storage atroom temperature. The SPS-BV was as effective as commercial nisin for controlling food spoilage bacteria along with significant reductions in moisture content and aw of dried squids during storage. This study confirms the biopreservative potential of the SPS-BV in dried seafood products in Thailand.","PeriodicalId":31349,"journal":{"name":"Suan Sunandha Rajabhat University Journal of Science and Technology","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91380049","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}
The levels of heavy metals in soil samples from selected major roads under construction, burrow sites (a place where soil was obtained for road filling) and two roads under use have been investigated. Soil samples were collected and digested using standard methods. The digests were analyzed for Ni, Cr, Zn, Cd, Cu and Pb using Atomic Absorption Spectrophotometer. The data were subjected to descriptive statistics, non linear regression and one way analysis of variance (ANOVA). The results showed that cadmium had the highest Contamination Factor (CF). The Pollution Load Index of the roads under construction was higher than each of the Burrow siteand one of the Trunk C roads analyzed for comparison. The Ecological Risk Factor of the sampling sites was less than 40 which indicated that, the levels of heavy metals on the road construction sites did not pose ecological risks to the environment. The Ecological Risk Index of each of all the sampling sites was less than 150 indicating that they fell within the low ecological risk category. The study established that the Burrow site did not contribute to the heavy metal concentration of the road under construction and the contamination was traced to vehicular activities.
{"title":"Road Construction and Vehicular Activities as Indicators for Heavy Metal Pollution in Osogbo Metropolis, South West Nigeria","authors":"Wasiu Bolade Agbaje, Mutiu Alani Fakunle, Luqman Adeyemi Azeez, Olalekan Aderemi Olabode, Oluwadurotimi Olutosin Akintade","doi":"10.53848/ssstj.v10i1.426","DOIUrl":"https://doi.org/10.53848/ssstj.v10i1.426","url":null,"abstract":"The levels of heavy metals in soil samples from selected major roads under construction, burrow sites (a place where soil was obtained for road filling) and two roads under use have been investigated. Soil samples were collected and digested using standard methods. The digests were analyzed for Ni, Cr, Zn, Cd, Cu and Pb using Atomic Absorption Spectrophotometer. The data were subjected to descriptive statistics, non linear regression and one way analysis of variance (ANOVA). The results showed that cadmium had the highest Contamination Factor (CF). The Pollution Load Index of the roads under construction was higher than each of the Burrow siteand one of the Trunk C roads analyzed for comparison. The Ecological Risk Factor of the sampling sites was less than 40 which indicated that, the levels of heavy metals on the road construction sites did not pose ecological risks to the environment. The Ecological Risk Index of each of all the sampling sites was less than 150 indicating that they fell within the low ecological risk category. The study established that the Burrow site did not contribute to the heavy metal concentration of the road under construction and the contamination was traced to vehicular activities.","PeriodicalId":31349,"journal":{"name":"Suan Sunandha Rajabhat University Journal of Science and Technology","volume":"71 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76406531","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}
Pub Date : 2023-01-03DOI: 10.53848/ssstj.v10i1.425
Adegbite Joseph Taye, Adeoti Lukumon, Johnson Temitayo Olatilewa, Anukwu Geraldine Chibuzo, Adeleke Taofik
Subsurface integrity assessment for building foundation using geophysical and geotechnical methods was carried out at Oniru, Eti- Osa, Lagos State. A total of twenty-five Vertical Electrical Sounding (VES), five 2-D Resistivity Imaging Survey traverses and two borings with Standard Penetration Test (SPT) were carried out at the study site. The acquired data were processed quantitatively using partial curve matching and computer iteration technique to generate the geoelectric sections, the 2-D model and the SPT logs. The VES results revealed five to six geologic units corresponding to topsoil, clayey sand, sandy clay, clay/peat, and sand while the 2-D resistivity structure corresponds with the VES result. The borehole log reveals sand layers having an N-value of 22-30 which is indicative of medium-dense, brown (medium to fine) sand with occasional gravels from depth 1.50 - 7.50m. The borehole log information correlates well with the VES/2-D result. For the sand layer which connotes dense, grey (medium to fine) sand with occasional gravels from a depth 7.50 – 15.75m with N-value ranging from 26–30m. The study analysis shows that the proposed building could be placed on the dense sand at depth 7.50 – 15.75m, this, however, should depend on the proposed load, length, and breadth of the proposed building. This study has provided useful information about the subsurface condition for engineering structure and zone suitable for the proposed foundation.
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