Pub Date : 2022-04-20DOI: 10.46223/hcmcoujs.tech.en.12.1.2217.2022
R. Buoy, Nguonly Taing, Sovisal Chenda, Sokchea Kor
This paper presents an end-to-end deep convolutional recurrent neural network solution for Khmer optical character recognition (OCR) task. The proposed solution uses a sequence-to-sequence (Seq2Seq) architecture with attention mechanism. The encoder extracts visual features from an input text-line image via layers of convolutional blocks and a layer of gated recurrent units (GRU). The features are encoded in a single context vector and a sequence of hidden states which are fed to the decoder for decoding one character at a time until a special end-of-sentence (EOS) token is reached. The attention mechanism allows the decoder network to adaptively select relevant parts of the input image while predicting a target character. The Seq2Seq Khmer OCR network is trained on a large collection of computer-generated text-line images for multiple common Khmer fonts. Complex data augmentation is applied on both train and validation dataset. The proposed model’s performance outperforms the state-of-art Tesseract OCR engine for Khmer language on the validation set of 6400 augmented images by achieving a character error rate (CER) of 0.7% vs 35.9%.
{"title":"Khmer printed character recognition using attention-based Seq2Seq network","authors":"R. Buoy, Nguonly Taing, Sovisal Chenda, Sokchea Kor","doi":"10.46223/hcmcoujs.tech.en.12.1.2217.2022","DOIUrl":"https://doi.org/10.46223/hcmcoujs.tech.en.12.1.2217.2022","url":null,"abstract":"This paper presents an end-to-end deep convolutional recurrent neural network solution for Khmer optical character recognition (OCR) task. The proposed solution uses a sequence-to-sequence (Seq2Seq) architecture with attention mechanism. The encoder extracts visual features from an input text-line image via layers of convolutional blocks and a layer of gated recurrent units (GRU). The features are encoded in a single context vector and a sequence of hidden states which are fed to the decoder for decoding one character at a time until a special end-of-sentence (EOS) token is reached. The attention mechanism allows the decoder network to adaptively select relevant parts of the input image while predicting a target character. The Seq2Seq Khmer OCR network is trained on a large collection of computer-generated text-line images for multiple common Khmer fonts. Complex data augmentation is applied on both train and validation dataset. The proposed model’s performance outperforms the state-of-art Tesseract OCR engine for Khmer language on the validation set of 6400 augmented images by achieving a character error rate (CER) of 0.7% vs 35.9%.","PeriodicalId":34742,"journal":{"name":"Ho Chi Minh City Open University Journal of Science Engineering and Technology","volume":"150 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82901878","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 : 2022-03-22DOI: 10.46223/hcmcoujs.tech.en.12.1.2020.2022
L. Canh, Ho Le Huy Phuc, N. Phuong
This paper presents a novel formulation for static limit analysis of structures, for which the Airy stress function is approximated using stabilized Radial Point Interpolation Mesh-free method (RPIM). The stress field is determined as second-order derivatives of the Airy function, and the equilibrium equations are automatically satisfied a priori. The so-called Stabilized Conforming Nodal Integration (SCNI) is employed to ensure a present method is truly a mesh-free approach, meaning that all constraints in problems are only enforced at nodes. With the use of the Airy function, SCNI, and Second-Order Cone Programming (SOCP), the size of the resulting problem is kept to be minimum. Several benchmark problems having arbitrary geometries and boundary conditions are investigated. The obtained numerical solutions are compared with those available in other studies to perform the computational aspect of the proposed method.
{"title":"Airy-based static limit analysis of structures using stabilized radial point interpolation method","authors":"L. Canh, Ho Le Huy Phuc, N. Phuong","doi":"10.46223/hcmcoujs.tech.en.12.1.2020.2022","DOIUrl":"https://doi.org/10.46223/hcmcoujs.tech.en.12.1.2020.2022","url":null,"abstract":"This paper presents a novel formulation for static limit analysis of structures, for which the Airy stress function is approximated using stabilized Radial Point Interpolation Mesh-free method (RPIM). The stress field is determined as second-order derivatives of the Airy function, and the equilibrium equations are automatically satisfied a priori. The so-called Stabilized Conforming Nodal Integration (SCNI) is employed to ensure a present method is truly a mesh-free approach, meaning that all constraints in problems are only enforced at nodes. With the use of the Airy function, SCNI, and Second-Order Cone Programming (SOCP), the size of the resulting problem is kept to be minimum. Several benchmark problems having arbitrary geometries and boundary conditions are investigated. The obtained numerical solutions are compared with those available in other studies to perform the computational aspect of the proposed method.","PeriodicalId":34742,"journal":{"name":"Ho Chi Minh City Open University Journal of Science Engineering and Technology","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82719449","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 : 2022-03-22DOI: 10.46223/hcmcoujs.tech.en.12.1.2033.2022
Huỳnh Tấn Đạt, P. Trang
Currently, risk is an issue of concern in a variety areas of society. The more human society develops, the more diverse, rich and complex human activities become. Therefore, risks are increasingly complex that effect negative impacts to people’s life. It can be said that construction work is a special product, therefore there are more and more risks that are hidden in the construction process. Especially, when building and working in remote, mountainous or border areas, the risks become more complex and diverse. Hence, if risks are identified quickly and accurately, managers can reduce the level of risk in the process. Then, people can aslo suggest some solutions to reduce the risks. This paper proposed and evaluated the risk factors of the construction process in several boder districts, Quang Nam province by applying Exploratory factor analysis (EFA) method. This study tried to collect data, analyze qualitative and quantitative risk factors. The results showed that the collected survey data is meaningful.
{"title":"Determining risks in the process construction: Analysing projects in border areas","authors":"Huỳnh Tấn Đạt, P. Trang","doi":"10.46223/hcmcoujs.tech.en.12.1.2033.2022","DOIUrl":"https://doi.org/10.46223/hcmcoujs.tech.en.12.1.2033.2022","url":null,"abstract":"Currently, risk is an issue of concern in a variety areas of society. The more human society develops, the more diverse, rich and complex human activities become. Therefore, risks are increasingly complex that effect negative impacts to people’s life. It can be said that construction work is a special product, therefore there are more and more risks that are hidden in the construction process. Especially, when building and working in remote, mountainous or border areas, the risks become more complex and diverse. Hence, if risks are identified quickly and accurately, managers can reduce the level of risk in the process. Then, people can aslo suggest some solutions to reduce the risks. This paper proposed and evaluated the risk factors of the construction process in several boder districts, Quang Nam province by applying Exploratory factor analysis (EFA) method. This study tried to collect data, analyze qualitative and quantitative risk factors. The results showed that the collected survey data is meaningful.","PeriodicalId":34742,"journal":{"name":"Ho Chi Minh City Open University Journal of Science Engineering and Technology","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88979743","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 : 2022-02-15DOI: 10.46223/hcmcoujs.tech.en.11.1.1602.2021
N. Phong, Nguyen Anh Thu, Le Thi Thuy An
This paper aims to find out the current state of the high-class apartment market. Qualitative research is done to adjust and supplement the observed variables for the scale. Quantitative research is conducted through a survey of customers who have bought a high-class apartment or are intending to buy an apartment to build a research model and test the scale. After collecting data, the study conducted the descriptive statistical analysis, testing the reliability of scale. Then, the Exploratory Factor Analysis (EFA) was performed to group the related factors into groups of factors that are independent. The research results showed that there are eight main groups of factors with 31 related observational variables that affected customers' decisions to choose high-class apartments.
{"title":"High-class apartment selection factors in Ho Chi Minh City","authors":"N. Phong, Nguyen Anh Thu, Le Thi Thuy An","doi":"10.46223/hcmcoujs.tech.en.11.1.1602.2021","DOIUrl":"https://doi.org/10.46223/hcmcoujs.tech.en.11.1.1602.2021","url":null,"abstract":"This paper aims to find out the current state of the high-class apartment market. Qualitative research is done to adjust and supplement the observed variables for the scale. Quantitative research is conducted through a survey of customers who have bought a high-class apartment or are intending to buy an apartment to build a research model and test the scale. After collecting data, the study conducted the descriptive statistical analysis, testing the reliability of scale. Then, the Exploratory Factor Analysis (EFA) was performed to group the related factors into groups of factors that are independent. The research results showed that there are eight main groups of factors with 31 related observational variables that affected customers' decisions to choose high-class apartments.","PeriodicalId":34742,"journal":{"name":"Ho Chi Minh City Open University Journal of Science Engineering and Technology","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83547818","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 : 2022-02-15DOI: 10.46223/hcmcoujs.tech.en.11.1.1446.2021
Le Thanh Cuong, To Thanh Sang
In the paper, a method of determining the structural damage using the Particle Swarm Optimization (PSO) algorithm is presented. PSO is a famous algorithm to search optimization. Damaged structural system members are detected by the PSO through the frequency change before and after the damage.
{"title":"The Particle Swarm Optimization (PSO) algorithm in Structural Health Monitoring (SHM) application","authors":"Le Thanh Cuong, To Thanh Sang","doi":"10.46223/hcmcoujs.tech.en.11.1.1446.2021","DOIUrl":"https://doi.org/10.46223/hcmcoujs.tech.en.11.1.1446.2021","url":null,"abstract":"In the paper, a method of determining the structural damage using the Particle Swarm Optimization (PSO) algorithm is presented. PSO is a famous algorithm to search optimization. Damaged structural system members are detected by the PSO through the frequency change before and after the damage.","PeriodicalId":34742,"journal":{"name":"Ho Chi Minh City Open University Journal of Science Engineering and Technology","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89955736","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 : 2022-02-15DOI: 10.46223/hcmcoujs.tech.en.11.1.1450.2021
Duong Hong Tham
This paper deals with the approach of predicting the consolidation settlement for a multi-layered foundation concerning the change in the compressibility of the settlement layers. This non-linear problem is preliminarily solved by using the Massachusetts Institute of Technology’s (MIT’s) suggestion of approximation, according to which every two layers are converted into a single layer having an equivalent coefficient of consolidation Cv. This paper aims to further the solution by considering the variation of the permeability in the settlement zones of each compressible layer as a change in the compressibility and coefficient of compression. During consolidation, the new value of k is updated, resulting in a new coefficient of consolidation Cv and mv simultaneously; then compressible layers are combined and converted into either equivalent properties or thickness of consolidation. In case the coefficient of volume compression mv is kept to be constant, and the change in the compressibility of the settling zone is taken into account as in this study, preliminary results on the settlement of the alternatives indicate that the consolidation settlement will be greater than that of the conventional approach of analysis and the numerical computation by Plaxis model. The results of the comparison between this study and those of the other models _that are assumed to yield the same time-dependent consolidation_ and numerical model Plaxis indicate that the consolidation for multi-layered foundation requires a more rigorous study. This is a more detailed modification for coming closer to a conservative prediction of the time of consolidation and final consolidation settlement.
{"title":"Studying the consolidation settlement for multi-layered foundation concerning the change in compressibility within the settlement zones","authors":"Duong Hong Tham","doi":"10.46223/hcmcoujs.tech.en.11.1.1450.2021","DOIUrl":"https://doi.org/10.46223/hcmcoujs.tech.en.11.1.1450.2021","url":null,"abstract":"This paper deals with the approach of predicting the consolidation settlement for a multi-layered foundation concerning the change in the compressibility of the settlement layers. This non-linear problem is preliminarily solved by using the Massachusetts Institute of Technology’s (MIT’s) suggestion of approximation, according to which every two layers are converted into a single layer having an equivalent coefficient of consolidation Cv. This paper aims to further the solution by considering the variation of the permeability in the settlement zones of each compressible layer as a change in the compressibility and coefficient of compression. During consolidation, the new value of k is updated, resulting in a new coefficient of consolidation Cv and mv simultaneously; then compressible layers are combined and converted into either equivalent properties or thickness of consolidation. In case the coefficient of volume compression mv is kept to be constant, and the change in the compressibility of the settling zone is taken into account as in this study, preliminary results on the settlement of the alternatives indicate that the consolidation settlement will be greater than that of the conventional approach of analysis and the numerical computation by Plaxis model. The results of the comparison between this study and those of the other models _that are assumed to yield the same time-dependent consolidation_ and numerical model Plaxis indicate that the consolidation for multi-layered foundation requires a more rigorous study. This is a more detailed modification for coming closer to a conservative prediction of the time of consolidation and final consolidation settlement.","PeriodicalId":34742,"journal":{"name":"Ho Chi Minh City Open University Journal of Science Engineering and Technology","volume":"132 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79658662","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 : 2021-12-08DOI: 10.46223/hcmcoujs.tech.en.12.1.1992.2022
Nguyen Thi Truc Phuong, D. T. Huy, Nguyễn Hữu Hùng
Liver cancer and breast cancer have high death rate and increased rapidly in recent years in Vietnam and over the world. Currently, the study of bioactive compounds isolated from plants for killing cancer cells is of interest. Herein, the study aims to identify the cytotoxicity using MTT assay of Combretum quadrangulare Kurz fractions against MCF-7 cells. RT-qPCR method was used to determine the survivin mRNA levels in P12 fraction-treated HepG2 and MCF-7 in comparison to DMSO-treated cells. The results showed that P12 fraction with IC50 of 20.9 ± 0.8 µg/mL was the best cytotoxicity on MCF-7 cells amongst P fractions. P12 fraction exhibited the apoptotic effect on HepG2 and MCF-7 cells by down-regulating survivin expression levels. Thus, P12 fraction was promising for the next research for the impact of fractions assessment in vivo or bioactive compounds isolation.
{"title":"Cytotoxic activity related to survivin mRNA levels by Combretum quadrangulare Kurz extract against liver and breast cancer cells","authors":"Nguyen Thi Truc Phuong, D. T. Huy, Nguyễn Hữu Hùng","doi":"10.46223/hcmcoujs.tech.en.12.1.1992.2022","DOIUrl":"https://doi.org/10.46223/hcmcoujs.tech.en.12.1.1992.2022","url":null,"abstract":"Liver cancer and breast cancer have high death rate and increased rapidly in recent years in Vietnam and over the world. Currently, the study of bioactive compounds isolated from plants for killing cancer cells is of interest. Herein, the study aims to identify the cytotoxicity using MTT assay of Combretum quadrangulare Kurz fractions against MCF-7 cells. RT-qPCR method was used to determine the survivin mRNA levels in P12 fraction-treated HepG2 and MCF-7 in comparison to DMSO-treated cells. The results showed that P12 fraction with IC50 of 20.9 ± 0.8 µg/mL was the best cytotoxicity on MCF-7 cells amongst P fractions. P12 fraction exhibited the apoptotic effect on HepG2 and MCF-7 cells by down-regulating survivin expression levels. Thus, P12 fraction was promising for the next research for the impact of fractions assessment in vivo or bioactive compounds isolation.","PeriodicalId":34742,"journal":{"name":"Ho Chi Minh City Open University Journal of Science Engineering and Technology","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74060064","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 : 2021-11-29DOI: 10.46223/hcmcoujs.tech.en.12.1.1961.2022
Dong Tam Vo Thanh Son
This research indicated 16 important factors that affect the result of labor safety program performance. The research was carried out by sending survey questionnaire to both foreigners and Vietnamese who are working for a medium and large scale construction projects. Most of them said that the most critical factor which influences the effect of labor safety program implementation on construction projects is “periodic evaluation of safety programs”. In addition, MEAN is used to rank significant factors basing on two group of respondents: Safety Managers (SM) and Project Managers (PM).
{"title":"Significant factors affecting the effect of safety program implementation on construction projects in Ho Chi Minh City, Viet Nam","authors":"Dong Tam Vo Thanh Son","doi":"10.46223/hcmcoujs.tech.en.12.1.1961.2022","DOIUrl":"https://doi.org/10.46223/hcmcoujs.tech.en.12.1.1961.2022","url":null,"abstract":"This research indicated 16 important factors that affect the result of labor safety program performance. The research was carried out by sending survey questionnaire to both foreigners and Vietnamese who are working for a medium and large scale construction projects. Most of them said that the most critical factor which influences the effect of labor safety program implementation on construction projects is “periodic evaluation of safety programs”. In addition, MEAN is used to rank significant factors basing on two group of respondents: Safety Managers (SM) and Project Managers (PM).","PeriodicalId":34742,"journal":{"name":"Ho Chi Minh City Open University Journal of Science Engineering and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89918290","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 : 2021-11-29DOI: 10.46223/hcmcoujs.tech.en.12.1.1880.2022
Nguyen Phuong Khanh, Nguyen Hoang Tan, Le Thi Hoang Uyen, Le Thi Hong Ngan
Ultraviolet B (UVB) radiation is directly related to sunburn and other visible changes on the skin surface, including discoloration and skin carcinoma. This study investigates the influence of UVB rays (wavelength from 290-320nm) on the formation of cancerous tissues and also shows the differences between abnormal and normal tissue. The mice were stimulated with DMBA chemical protocol and exposure to UVB radiation for skin carcinogenesis. Normal and cancerous skin tissue were stained with Hematoxylin and Eosin, then were measured to obtain optical properties by applying Mueller-Matrix Decomposition, which is considered as an effective skin structure analysis method. Long term exposure to UVB radiation caused skin inflammation and the appearance of crystal bumps. Histopathology results clearly indicate the increasing number of papilloma cells, and prolonged damage by UVB radiation. Skin structural analysis was specified with the optical parameters by Mueller Matrix Decomposition method. The extension of skin carcinoma significantly lessened the values of Linear Birefringence (LB) and Circular Birefringence (CB), as well as the variation of Linear Dichroism (LD) and Circular Dichroism (CD) parameters help validate the differences between normal and squamous cell skin sample.
{"title":"Skin carcinogenesis in mice using UVB radiation","authors":"Nguyen Phuong Khanh, Nguyen Hoang Tan, Le Thi Hoang Uyen, Le Thi Hong Ngan","doi":"10.46223/hcmcoujs.tech.en.12.1.1880.2022","DOIUrl":"https://doi.org/10.46223/hcmcoujs.tech.en.12.1.1880.2022","url":null,"abstract":"Ultraviolet B (UVB) radiation is directly related to sunburn and other visible changes on the skin surface, including discoloration and skin carcinoma. This study investigates the influence of UVB rays (wavelength from 290-320nm) on the formation of cancerous tissues and also shows the differences between abnormal and normal tissue. The mice were stimulated with DMBA chemical protocol and exposure to UVB radiation for skin carcinogenesis. Normal and cancerous skin tissue were stained with Hematoxylin and Eosin, then were measured to obtain optical properties by applying Mueller-Matrix Decomposition, which is considered as an effective skin structure analysis method. Long term exposure to UVB radiation caused skin inflammation and the appearance of crystal bumps. Histopathology results clearly indicate the increasing number of papilloma cells, and prolonged damage by UVB radiation. Skin structural analysis was specified with the optical parameters by Mueller Matrix Decomposition method. The extension of skin carcinoma significantly lessened the values of Linear Birefringence (LB) and Circular Birefringence (CB), as well as the variation of Linear Dichroism (LD) and Circular Dichroism (CD) parameters help validate the differences between normal and squamous cell skin sample.","PeriodicalId":34742,"journal":{"name":"Ho Chi Minh City Open University Journal of Science Engineering and Technology","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79996068","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 : 2021-11-29DOI: 10.46223/hcmcoujs.tech.en.12.1.2028.2022
Do Thi Thu Hien, Kha Chan Tuyen, H. Trang
This study used polysaccharide (PS) from yeast cell walls to encapsulate polyphenols (PP) extracted from green tea (a good antioxidant substance) to avoid the effects of sensitive factors such as temperature, light and oxygen, and to preserve its stability and bioactivities. The objective of this study was to investigate the effects of four types of wall material (PS-MD (maltodextrin), PS-whey, whey, and MD). After selecting the most appropriate wall material, the study continued to investigate the effects of the ratios of the core to the wall material (1:1, 1:2, 1:3 and 1:4, w/w); the inlet air temperatures of spray-drying (130, 140, 150 and 160 °C); and the feed flow rates (04, 05, 06 and 07mL/min) on the microencapsulation yield (MEY) and the microencapsulation efficiency (MEE). The results showed the best settings as follows the wall material being PS-MD, the ratio of PP to the wall material as 1:3 (w/w), the inlet air temperatures at 140 °C, and the feed flow rate at 05mL/min. Under those conditions, the MEY and the MEE were found to be highest as 31.118mg/g and 86.73%, respectively. When examined by scanning electron microscopy (SEM), they had various sizes and spherical shapes and some of them had smooth or concave surfaces. As a result, it could be concluded that polyphenols were successfully encapsulated in the PS-MD matrix by spray-drying and the application to some food products could be further studied.
{"title":"Spray-drying microencapsulation of polyphenols by polysaccharide from yeast cell walls","authors":"Do Thi Thu Hien, Kha Chan Tuyen, H. Trang","doi":"10.46223/hcmcoujs.tech.en.12.1.2028.2022","DOIUrl":"https://doi.org/10.46223/hcmcoujs.tech.en.12.1.2028.2022","url":null,"abstract":"This study used polysaccharide (PS) from yeast cell walls to encapsulate polyphenols (PP) extracted from green tea (a good antioxidant substance) to avoid the effects of sensitive factors such as temperature, light and oxygen, and to preserve its stability and bioactivities. The objective of this study was to investigate the effects of four types of wall material (PS-MD (maltodextrin), PS-whey, whey, and MD). After selecting the most appropriate wall material, the study continued to investigate the effects of the ratios of the core to the wall material (1:1, 1:2, 1:3 and 1:4, w/w); the inlet air temperatures of spray-drying (130, 140, 150 and 160 °C); and the feed flow rates (04, 05, 06 and 07mL/min) on the microencapsulation yield (MEY) and the microencapsulation efficiency (MEE). The results showed the best settings as follows the wall material being PS-MD, the ratio of PP to the wall material as 1:3 (w/w), the inlet air temperatures at 140 °C, and the feed flow rate at 05mL/min. Under those conditions, the MEY and the MEE were found to be highest as 31.118mg/g and 86.73%, respectively. When examined by scanning electron microscopy (SEM), they had various sizes and spherical shapes and some of them had smooth or concave surfaces. As a result, it could be concluded that polyphenols were successfully encapsulated in the PS-MD matrix by spray-drying and the application to some food products could be further studied.","PeriodicalId":34742,"journal":{"name":"Ho Chi Minh City Open University Journal of Science Engineering and Technology","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82861448","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}
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