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Fluorescent Sensors From Salicylaldimine Derivatives For Metal Ions, Phoom Sangsuwan
Fluorescent Sensors From Salicylaldimine Derivatives For Metal Ions, Phoom Sangsuwan
Chulalongkorn University Theses and Dissertations (Chula ETD)
An in-situ forming and sensing was developed as a high-throughput screening of fluorescent chemosensors for metal ions. The 45 salicylaldimines, formed in-situ from the condensation between 5 salicylaldehydes and 9 amines, in 96 well-plates were photographed under black light along with the 5 salicylaldehydes in the absence and presence of 18 metal ions. The library of fluorescence response images of these 50 chemosensors were processed into RGB values. The PCA of theΔRGB, the differences between those of images with and without the metal ions, showed 9 sensors with normalized loading value over 70%. The sensor array constructed from these 9 …
Hybrid Materials From Covalent Organic Frameworks And Ionic Liquids, Ranida Maliyaem
Hybrid Materials From Covalent Organic Frameworks And Ionic Liquids, Ranida Maliyaem
Chulalongkorn University Theses and Dissertations (Chula ETD)
Covalent organic frameworks (COFs) are new type material, whereby their wide range of properties derived from the chemistry of frameworks and their regular porosity. Here in, we reported the successful syntheses of the novel hybrid materials between porous COF material and ionic liquids (ILs). The crystalline porous powder of boroxine‑based COF, so called COF‑5, is reproducible via a condensation reaction between hexahydroxyltriphenylene and phenyldiboronic acid under a mild condition using a conventional heating method. The as‑synthesized COF-5 was characterized with PXRD, FT-IR, TGA and BET techniques, showing that the material contained 1D regular channels caused by π-π stacking of the …
Synthesis Of Halogenated Flavonoids As Anti-Dengue Agents, Thao Huynh Nguyen Thanh
Synthesis Of Halogenated Flavonoids As Anti-Dengue Agents, Thao Huynh Nguyen Thanh
Chulalongkorn University Theses and Dissertations (Chula ETD)
Flavonoids have been recognized as promising compounds with various bioactivities. Certain flavonoid derivatives exhibited more potent activities than their parent compounds. Recently, halogenated flavonoids have been addressed for their anti-dengue activity. In this research, a series of twenty-two brominated and iodinated flavonoid derivatives were synthesized and explored for dengue infection inhibition. Seventeen derivatives have been investigated for the first time. 8-Bromobaicalein, 6,8-dibromopinocembrin, 6,8-dibromopinostrobin, 6,8-diiodopinostrobin were disclosed as effective and non-toxic anti-dengue agents. These compounds displayed remarkably low EC50 as well as high CC50, which could be considered as potent therapeutic agents. Moreover, the preliminary screening on brominated O7-ether chrysins discovered …
Green Synthesis Of Gold Nanoparticles Using Natal Lily Crinum Moorei Extract And Biological Activities, Warinda Marujiwat
Green Synthesis Of Gold Nanoparticles Using Natal Lily Crinum Moorei Extract And Biological Activities, Warinda Marujiwat
Chulalongkorn University Theses and Dissertations (Chula ETD)
Crinum moorei as medical herb has different pharmacological activities such as anti-cancer and anti-inflammatory properties. Gold nanoparticle (AuNP) is an interesting anti-cancer drug carrier which can solve anti-cancer drug's problems with good biocompatibility, non-toxicity and suitable size for the intracellular uptake to treat to the target cells. From the beginning, other reducing agents were used to synthesize AuNPs. However, they lead to the contamination of chemicals on AuNP's surfaces which limits the medical application or long process and time consuming. Therefore, plant extracts were studied to make a remarkable dual function: the synthesized AuNPs agent and drug agent. In this …
The Relationship Of Influential Factors On Material Management Effectiveness In Building Construction Projects: Case Study In Vietnam, Bao Van Pham
Chulalongkorn University Theses and Dissertations (Chula ETD)
The improvement of management processes in construction could be seen as one of the important keys to project success in which material management should be appropriately taken into consideration. Although many previous research studies have examined the components of construction material management, the relationship of factors influencing material management effectiveness has not been explored. This study was carried out to identify influential factors on material management effectiveness and develop a model to explain the relationships between these factors and the effectiveness of material management based on practical projects. The research method included the collection of contractors' opinions in building projects …
Sbfe Analysis Of Layered Elastic Media With Consideration Of Surface Energy Effect, Chantha Chhuon
Sbfe Analysis Of Layered Elastic Media With Consideration Of Surface Energy Effect, Chantha Chhuon
Chulalongkorn University Theses and Dissertations (Chula ETD)
This thesis presents an efficient and accurate numerical technique for determining mechanical response of a two-dimensional, infinite, elastic, layered medium under arbitrary surface loading and surface stress effects. Governing equations of a generic bulk layer are formulated from the classical linear elasticity theory via a SBFE technique whereas those of the generic material surface are obtained from a full version of Gurtin-Murdoch surface elasticity theory. The formulation is established sufficiently general allowing both homogenous and functionally graded bulk materials to be treated for each layer. By enforcing the continuity at the interface of the material surface and the bulk, it …
Development Of Causal Relationship Model Of Knowledge Sharing In Construction Projects, Lambada Roeun
Development Of Causal Relationship Model Of Knowledge Sharing In Construction Projects, Lambada Roeun
Chulalongkorn University Theses and Dissertations (Chula ETD)
Knowledge sharing among construction project members is very crucial for improving project success and project performance. It can also reduce mistakes in the construction process. Project management has been growing more complicated, and project members need to learn best practice from others. Currently, knowledge sharing is not well performed yet; especially, few research studies have been focused on the relationship evaluation of supporting factors that affect knowledge sharing from different contexts in construction projects. Therefore, this study aims to develop the causal relationship model of supporting factors from psychological, individual, organizational, and technological factors that affect mediators - knowledge sharing …
Poroelastodynamic Solutions Of Transversely Isotropic Multi-Layered Media, Suraparb Keawsawasvong
Poroelastodynamic Solutions Of Transversely Isotropic Multi-Layered Media, Suraparb Keawsawasvong
Chulalongkorn University Theses and Dissertations (Chula ETD)
This dissertation presents poroelastodynamic fundamental solutions of transversely isotropic poroelastic materials. Analytical general solutions for transversely isotropic poroelastic media under time-harmonic loading are derived for plane strain and axisymmetric problems by applying Fourier and Hankel integral transforms respectively. The fundamental solutions for a homogeneous half-space are then explicitly obtained by solving relevant boundary value-problems based on the derived general solutions. An exact stiffness matrix method is also employed based on the present general solutions to determine the fundamental solutions corresponding to multi-layered transversely isotropic poroelastic media. The obtained fundamental solutions are then employed in the analysis of dynamic interaction problems …
The Effect Of Nac And Carnosine On AlzheimerS Disease-Related In Vitro Model Through Rage-Age Signaling Pathway, Suphasarang Sirirattanakul
The Effect Of Nac And Carnosine On AlzheimerS Disease-Related In Vitro Model Through Rage-Age Signaling Pathway, Suphasarang Sirirattanakul
Chulalongkorn University Theses and Dissertations (Chula ETD)
Alzheimer’s disease (AD) is the most common dementia which found increasing with age. It involves neurodegeneration which leads to various abnormalities especially memory loss, inability to learn new things, lack of creativity, lack of decision making ability, lack of critical thinking, calculation inability, inability to live normal daily life, inability to recognize person, time and place, emotional disturbance, and difficulty to use language. Since AD has severe impact in various aspects on both the patients and their families, so we are interested to study the neurodegenerative mechanism when neuronal cells are under oxidative stress which will induce neuroinflammation through the …
Neurodevelopmental And Neurobehavioral Outcomes In Early Antiretroviral Treated Young Children With Perinatally-Acquired Hiv Infection (Phiv) Compared To Age-Matched Perinatally Hiv-Exposed Uninfected Children (Pheu), Watsamon Jantarabenjakul
Neurodevelopmental And Neurobehavioral Outcomes In Early Antiretroviral Treated Young Children With Perinatally-Acquired Hiv Infection (Phiv) Compared To Age-Matched Perinatally Hiv-Exposed Uninfected Children (Pheu), Watsamon Jantarabenjakul
Chulalongkorn University Theses and Dissertations (Chula ETD)
Introduction: Although early initiation of antiretroviral therapy (ART) in perinatally HIV infected (PHIV) infants significantly reduces morbidity and mortality, neurodevelopmental and neurobehavioral problems are still issues of concern. Objectives: This study aims primarily to compare neurodevelopmental outcomes and neurobehavioral outcomes between PHIV children who initiated ART within 12 months of life and perinatally HIV-exposed uninfected (PHEU) children. The secondary aims are to assess the outcomes by timing of ART initiation and to delineate factors and predictors associated with neurodevelopmental and neurobehavioral outcomes. Methods: This study was a prospective observational study which enrolled PHIV and PHEU children aged 12-56 months. Neurodevelopmental …
Spark Steaming Framework For Large-Scale Multi-Stream Data Analytics, Tanwa Sirisakdiwan
Spark Steaming Framework For Large-Scale Multi-Stream Data Analytics, Tanwa Sirisakdiwan
Chulalongkorn University Theses and Dissertations (Chula ETD)
Real-time streaming applications with multiple heterogeneous data streams have become increasingly popular especially in IoT applications where huge amount of sensors produce large amount of data in the form of data streams. However, many issues still exist, especially in deploying and maintaining these large amounts of data streams. Using Spark Structured Streaming, this research introduces a Spark Streaming framework for multiple heterogeneous data streams which focuses on the ease of deployment and proper scheduling. Our proposed framework is a library that allows the deployment of multiple heterogeneous data stream processing in a single Spark application. Our framework can reduce deployment …
Sex-Composition Of Children And Fertility Desire In Vietnam, Hai Yen Thi Nguyen
Sex-Composition Of Children And Fertility Desire In Vietnam, Hai Yen Thi Nguyen
Chulalongkorn University Theses and Dissertations (Chula ETD)
This thesis aims to investigate whether the variation in sex composition of children can explain the variation of Vietnamese women's fertility desire. Vietnam has experienced rapid fertility decline since the middle of the 20th century but within a broader context of strong cultural norms regarding son preference. Thus, the sex composition of children is one of the key determinants of reproductive behavior within Vietnam. To my knowledge, no previous study has examined the relationship between sex composition of children and women's fertility desires in Vietnam. Using data from the 2014 Vietnam Multiple Indicator Cluster Survey (MICS) I investigate the association …
Socio Economic Determinants Of Spousal Violence Against Women In Myanmar, Lin Lin Mar
Socio Economic Determinants Of Spousal Violence Against Women In Myanmar, Lin Lin Mar
Chulalongkorn University Theses and Dissertations (Chula ETD)
Nowadays, the violence against women by spouses is a hidden social problem embedded in social and cultural norms in Myanmar. However, there are limited numbers of previous studies regarding spousal violence in Myanmar. Some studies utilized a qualitative approach, while some used a quantitative approach in some parts of Myanmar. This study aims to examine whether socioeconomic and demographic factors affecting spousal violence using a quantitative approach to fill the literature gap at the national level. It uses the data from the 2015-16 Myanmar Demographic and Health Survey. The explanatory variables are demographic and socio-economic characteristics of the women, their …
Effectiveness Of Different Root Canal Disinfection Protocols On The Reduction Of Bacteria In Large Root Canals, Parnwad Sasanakul
Effectiveness Of Different Root Canal Disinfection Protocols On The Reduction Of Bacteria In Large Root Canals, Parnwad Sasanakul
Chulalongkorn University Theses and Dissertations (Chula ETD)
Introduction: The aims of this study were to evaluate the effectiveness of disinfection methods and determine the most promising irrigation protocol for regenerative endodontics in teeth with large root canals. Methods: Sterilized root samples with 0.8-mm wide apical foramen (n=94) were prepared from human mandibular premolars. Ninety-two samples were infected with E. faecalis for 21 days and biofilm formation was verified using scanning electron microscopy (n=2). The 90 infected samples were randomly assigned into 9 groups: no intervention (initial), 1.5% NaOCl irrigation (1.5N), 2.5% NaOCl irrigation (2.5N), 1.5N + intermittent passive ultrasonic irrigation (PUI), 1.5N + intermittent canal brushing with …
Predictive Survivability Model Of Technological Start-Ups: A Case Study Of Smart Parking, Akshay Nirmal Singh
Predictive Survivability Model Of Technological Start-Ups: A Case Study Of Smart Parking, Akshay Nirmal Singh
Chulalongkorn University Theses and Dissertations (Chula ETD)
The dissertation focuses on analysing pre-existing survivability prediction models that can be applied to new businesses and start-ups. After studying certain popular models and their critical success factors that can be found in successful businesses and are lacking in failed businesses a new prediction model for technological companies will be crafted. Furthermore, a case study of a potential technological start-up company called Smart Parking will be internally and externally analysed with regards to the environment in will be operating in. The analyses of the internal and external environments will help plan and come up with business strategies for Smart Parking. …
Design Of Business Intelligence System For Point-Of-Sales Software In Full-Service Restaurants, Lalida Chunhasomboon
Design Of Business Intelligence System For Point-Of-Sales Software In Full-Service Restaurants, Lalida Chunhasomboon
Chulalongkorn University Theses and Dissertations (Chula ETD)
Small and Medium-sized restaurants are faced with increasing competitions due to the rise of food reviews and food delivery mobile applications which increase accessibility and customer demands. In order to thrive in this competition, restaurant owners seek to know their performance beyond sales number as there are other aspects of restaurant management such as operations efficiency, inventory, and quality of service. However, the current offerings by various POS in the market do not provide such performance measures, making it impossible for owners to know and improve other dimensions of restaurant management. As a result, the case-study company identified the gap …
The Relationship Between Attitudes Toward The Test Of English For International Communication (Toeic) And Scores Of Thai Test Takers, Danai Wongsa
Chulalongkorn University Theses and Dissertations (Chula ETD)
Attitudes have played a pivotal role affecting not only English language learning but also language test performance. There have been some studies exhibiting that students' attitudes in English language learning were significantly related to their English test proficiency and their scores. The objectives of this study were to examine Thai test takers' attitudes toward the Test of English for International Communication (TOEIC) and explored the relationship between Thai test takers' attitudes toward the TOEIC and their scores. This study used quantitative and qualitative methods to collect and analyze the data under the research framework adapted from the ABC model of …
Effect Of Operating Conditions On Color And Anions Removal From Textile Industrial Effluent Using Membrane Distillation System, Pyae Phyo Kywe
Effect Of Operating Conditions On Color And Anions Removal From Textile Industrial Effluent Using Membrane Distillation System, Pyae Phyo Kywe
Chulalongkorn University Theses and Dissertations (Chula ETD)
One of the main pollution from textile wastewater is the dyeing wastewater containing color and organic matters. To develop wastewater treatment systems and to reuse the water are still challenged because of the scarcity of water in the world. Among the treatment methods of textile wastewater, membrane distillation was used as the concept of this research. The focus points of the direct contact membrane distillation system are the membrane characteristics, operating parameters (temperature and flow rate) and treatment efficiency. The synthetic dye wastewater (reactive black-5 and reactive blue-19) and real textile effluent were used as the feed wastewater. In this …
Acclimatization And Application Of Biofilters For Nitrogen Removal In Marine Recirculating Shrimp Culture System, Penpicha Satanwat
Acclimatization And Application Of Biofilters For Nitrogen Removal In Marine Recirculating Shrimp Culture System, Penpicha Satanwat
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research involved in the complete nitrogen removal in marine recirculating aquaculture system (RAS) through sequential nitrification and denitrification processes using internal biofilter within a single tank. The study was divided into two experimental parts. The first study was to estimate the effects of salinity (5, 15 and 25 PSU) and stocking density (50 and 100 shrimp m-2) on nitrification and denitrification efficiencies, as well as on microbial diversity in the biofilm. Also, the nitrogen removal efficiencies of fibrous BiocordTM biofilter and Japanese filter mat were compared. Results showed that the nitrification was stimulated in low-salinity (5 PSU) system with …
Study Of Gas-Liquid Mass Transfer In Bubble And Spray Column Adding Solid Media, Kritchart Wongwailikhit
Study Of Gas-Liquid Mass Transfer In Bubble And Spray Column Adding Solid Media, Kritchart Wongwailikhit
Chulalongkorn University Theses and Dissertations (Chula ETD)
Gas absorption is a separation process that transfers substances from gas phase to liquid phases due to the different concentrations. The operation can be applied in many treatments or purifying processes e.g. CO2 absorption from biogas or volatile organic compounds (VOCs) recovery from petroleum emission air. The conventional unit operation using for the gas absorption process are bubble column and spray column. Although there are several literatures reporting the efficiency of spray columns and bubble columns, those were done separately. Therefore, this research projected to investigate both hydrodynamics and mass transfer in both spray and bubble columns and comparing their …
Heavy Metals Adsorption In Simulated Groundwater Using Iron Oxide Particles And Iron Oxide Coated Sand, Ramy Lun
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study aimed to understand adsorption mechanisms of single of heavy metals such as Mn, As and Fe and a combined heavy metal in simulated groundwater using iron oxide particles (IOP) and iron oxide coated sands (IOCS). The experiment was conducted in batch test. In order to understand mechanism of heavy metals adsorption, pseudo first-order and pseudo second-order of kinetic, and Langmuir and Freundlich isotherm models were applied by varying adsorbent dosages from 4 to 24 mg/L ,and 10 to 60 min of times. Optimal dosages for single heavy metals and a combined heavy metal removal were 12, 12, 20 …
Comparison Of Three Dimensional Accuracy For Surgical Guided Template Fabrication Using Two Different Implant Planning Software Programs, Natchaya Thitaphanich
Comparison Of Three Dimensional Accuracy For Surgical Guided Template Fabrication Using Two Different Implant Planning Software Programs, Natchaya Thitaphanich
Chulalongkorn University Theses and Dissertations (Chula ETD)
Statement of problem: Static computer-assisted implantation system (s-CAIS) has been introduced to implant dentistry for decades. According to previous studies, they were recognised the inaccuracies of actual implant position placed via using static computer-assisted implantation system. These inaccuracies result from an accumulation of every step in the workflow from planning to accuracy assessment. Recently, there are multiple implant planning softwares available. coDiagnostiXTM software and Implant StudioTM software are widely used third-party implant planning softwares which claimed to provide predictable implant placement outcome. However, the effect of softwares used on accuracy of guided surgery in anterior maxilla region has not been …
Fracture Resistance Of Endodontically Treated Premolars With Deep Cervical Lesion Restored With And Without Post In Different Restorations, Phrohphrim Suebsawadphatthana
Fracture Resistance Of Endodontically Treated Premolars With Deep Cervical Lesion Restored With And Without Post In Different Restorations, Phrohphrim Suebsawadphatthana
Chulalongkorn University Theses and Dissertations (Chula ETD)
Objectives: The purpose of this study was to evaluate the effects of fiber posts and different restorations on the fracture resistance of endodontically treated maxillary premolars with cervical cavities. Methods: In forty extracted human first maxillary premolars, cervical cavities were prepared simulating cervical lesions and randomly divided into four groups (n=10): COM-NP, endodontically treated teeth (ETT) restored with resin composite without fiber posts; ON-NP, ETT restored with CAD/CAM ceramic onlays without fiber posts; COM-P, ETT restored with resin composite and fiber posts; and CR-P, ETT restored with CAD/CAM ceramic crowns and fiber posts. After the fiber posts and restorations had …
Effect Of Bitter Gourd Extracts On The Mutagenicity Of 1-Aminopyrene Reacted With Nitrite Using Ames Test, Korkiat Panpasuk
Effect Of Bitter Gourd Extracts On The Mutagenicity Of 1-Aminopyrene Reacted With Nitrite Using Ames Test, Korkiat Panpasuk
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study was conducted to investigate the mutagenic activity of raw and cooked bitter gourd (Momordica charantia) including raw fruit extract (RW), blanching water (BW), hot water extract from blanched fruit (HB), stir-fried fruit extract (SF), and stir-fried fruit (pre-squeezed with salt) extract (SS). In addition, the effects of extracts in modifying the mutagenic activity of mutagen freshly prepared by the reaction between 1-aminopyrene and sodium nitrite and the effects when adding each extract at the beginning of the same reaction using Ames test on Salmonella typhimurium strains TA98 and TA100 without enzymatic activation were also determined. The data for …
Antioxidant And Antimutagenic Activity Of Extracts From Pericarp And Seed Of Zanthoxylum Limonella Alston, Patamawan Wipoosanapan
Antioxidant And Antimutagenic Activity Of Extracts From Pericarp And Seed Of Zanthoxylum Limonella Alston, Patamawan Wipoosanapan
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study was conducted to investigate the antioxidant and antimutagenic activity of Zanthoxylum limonella seed extract and that of Z. limonella pericarp extract. The total phenolic contents and antioxidant activity assay including DPPH assay and FRAP assay were performed. The results showed that the antioxidant activity of pericarp extract was higher than that of the seed extract. The direct mutagenicity assay was determined, with and without nitrite treatment using the Ames test towards Salmonella typhimurium strains TA98 and TA100. The mutagenic modification assay was performed by measuring the interfering effect of the pericarp extract and the seed extract on the …
Preparation And Antimicrobial Activity Of Caprylic Acid Emulsion For Food Coating, Raweewan Bunyovimonnat
Preparation And Antimicrobial Activity Of Caprylic Acid Emulsion For Food Coating, Raweewan Bunyovimonnat
Chulalongkorn University Theses and Dissertations (Chula ETD)
Antimicrobial food coating is the interesting method for food preservation, especially in fruits and vegetables. Previous studies have been reported that the caprylic acid had the antimicrobial activity against a variety of microorganisms. However, little research has been conducted on the use of caprylic acid in the form of food coatings. Therefore, this study aims to determine the optimum conditions for the caprylic acid emulsion preparation and to evaluate the antimicrobial activity of the emulsion, including the effect of food coatings with caprylic acid emulsion on physical properties and microbial growth inhibition. Emulsions containing 4% w/v caprylic acid (oil) and …
Carbohydrate Content Of The Medications For Epileptic Children Treated With Ketogenic Diet At King Chulalongkorn Memorial Hospital, Thanarat Sawangrit
Carbohydrate Content Of The Medications For Epileptic Children Treated With Ketogenic Diet At King Chulalongkorn Memorial Hospital, Thanarat Sawangrit
Chulalongkorn University Theses and Dissertations (Chula ETD)
The purposes of this study were to establish a database of the carbohydrate content of medications and investigate carbohydrate content of medications in epileptic children treated with ketogenic diet (KD) at King Chulalongkorn Memorial Hospital. One hundred sixty-nine KD order forms in 3 events (KD initiation, follow-up visit, and hospital re-admission) for epileptic children whose aged younger than 18 years old during 2009-2017 were selected. Clinical and nutritional data were obtained from medical records and KD order forms from the pediatric nutrition unit. The study showed that oral liquid dosage forms had the highest carbohydrate content in the formulations as …
Politics Of Changes In Thailand's University Admission Policy (1999-2017), Nitchapat Kitcharern
Politics Of Changes In Thailand's University Admission Policy (1999-2017), Nitchapat Kitcharern
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research aims to study a significant phenomenon, the changes in Thailand's University Admission system between 1999 and 2017. During this period, the admission system was changed six times. This research focuses on the political factors that led to the changes in admission policy, particularly the relationships among politicians, bureaucracy, schools, civil society and students. The purpose of this research is threefold: (1) to understand the causes and procedures of changes in Thailand's university admission policy, (2) to study and understand the correlation between politics and changes in university admission system, and (3) to understand the impact these changes had …
Crude Oil Removal By Sphingobium Sp. Mo2-4 And Bacillus Megaterium Tl01-2 Immobilized On Aquaporous Gel, Adisan Rungsihiranrut
Crude Oil Removal By Sphingobium Sp. Mo2-4 And Bacillus Megaterium Tl01-2 Immobilized On Aquaporous Gel, Adisan Rungsihiranrut
Chulalongkorn University Theses and Dissertations (Chula ETD)
Petroleum products are the major energy sources that drive global economy. The exploration and exploitation of crude petroleum oil increase the potential risk for oil spills in marine ecosystem. In this work, two non-pathogenic sponge-associated bacteria were developed as immobilized bacterial co-culture for crude oil removal from seawater. Two bacteria were Spingobium sp. MO2-4 that could degrade crude oil, diesel oil, and fuel oil, and Bacillus megaterium TL01-2 that could degrade crude oil, possessed high cell surface hydrophobicity, could tolerate heavy metal, and was able to form biofilm.. The modified polyurethane foam, aquaporous gel (AQ), was used as carrier for …
Formulation Of Oil Dispersants By Mixing Lipopeptide Biosurfactant And Non-Ionic Surfactants, Parisarin Nawavimarn
Formulation Of Oil Dispersants By Mixing Lipopeptide Biosurfactant And Non-Ionic Surfactants, Parisarin Nawavimarn
Chulalongkorn University Theses and Dissertations (Chula ETD)
Marine oil spill can cause various harmful impacts to the environment. To solve this problem, dispersant is usually applied to enhance petroleum remediation in seawater. The commercial dispersants mostly contain surfactant and solvent that can be toxic to marine lives. This study aimed to formulate solvent-free biosurfactant-based dispersants by mixing lipopeptides from Bacillus subtilis GY19 with fatty alcohol ethoxylate (Dehydol LS7TH), a low toxicity nonionic surfactant. Hydrophilic-lipophilic deviation (HLD) concept was applied. The fractions of lipopeptide and dehydol LS7TH were determined based on the equivalent alkane carbon number (EACN) of hydrocarbons under seawater salinity (34ppt). The molar fractions of lipoppeptide …