Poster OER - Ngành Công nghệ kỹ thuật hóa học
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Đang duyệt Poster OER - Ngành Công nghệ kỹ thuật hóa học theo Nhan đề
Đang hiển thị 1 - 10 trong tổng số 10
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- Tài liệuA comparison of chemical composition and antioxidant activity in various Vietnamese garlic oil samples(Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh University, 2020-10) Nguyen, Thi Ngoc Lan, MDGarlic is a familiar spice in all households and in medicine. It is also known for its potent antioxidant and anti-cancer properties. This study determined the optimal combination of operating parameters for the hydrodistillation of Ly Son garlic essential oil. The effects of distillation time, water-to-material ratio, soaking time in NaCl solution, and NaCl concentration on the yield of essential oil extraction were investigated. The results established the optimal extraction conditions as follows: distillation time of 2.5 hours, soaking time of 1 hour, NaCl concentration of 2%, and a water-to-material ratio of 1:7. Under these conditions, the maximum yield obtained was 3%. Ly Son garlic exhibited the highest antioxidant capacity, while Phan Rang garlic showed the lowest.
- Tài liệuAssessment Of The Total Phenolic Contents And Antioxidant Capacities In Roasted Ground Coffee Products In Viet Nam(Nguyen Tat Thanh University, 2022-09) Nguyen, Nhut Truong; Tran, Bui Phuc; Nguyen, Cong HauCoffee tree is a popular non-alcoholic beverage in the world thanks to its taste and health benefits to humans. TPC results in descending order: light > medium > dark, in which light roast gives the highest total phenolic compounds. Besides, TPC and TEAC differ in degrees of roasting, with light roasting mainly showing the highest value due to the balance between the breakdown of phenolic compounds and the generation of new antioxidant compounds. mainly from the Maillard reactions. The close correlation between TPC and antioxidant capacity for the correlation coefficient (R2> 0.7) suggests that phenolic compounds play an important role in the antioxidant capacity of coffee.
- Tài liệuExtraction of fennel essential oil (Foeniculum vulgare M.): method, chemical composition, and kinetic model(Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh University, 2024-08) Cuong, M. Huynh; Danh, H. Pham, MSc.Fennel (Foeniculum vulgare M.) is one of the most commonly used and extensively studied medicinal herbs worldwide. Many researchers report multitudinous health benefits. This study used hydrodistillation (HD) and microwave-assisted hydrodistillation (MAHD) methods to extract fennel essential oil. Parameters affecting the process such as material-to-water ratio, heater power, and distillation time were investigated. Both techniques achieved the highest yield (1.9%) at a material-to-water ratio of 1:6, heater power of 350 W (HD), and 1080 W (MAHD). Under these conditions, the two-site desorption model showed compatibility, i.e., the extraction process included two stages of breaking essential oil particles and diffusing them from plant cells. Chemical composition analysis showed fennel essential oil contained four main components: anethole (58.76%), estragole (26.55%), terpinolene (8.32%), and D-limonene (4.66%). Among them, anethole is the main scent compound of fennel seed oil and exhibits anticancer activity.
- Tài liệuFabrication of Rosemary Essential Oil Nanoemulsions via Phase Inversion Temperature(Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh University; AOTA International Joint Stock Company, Ho Chi Minh City, 2019-10) Le, Minh Thuy Duong, ST; Luu, Xuan Cuong, PhD; Nguyen, Dinh Phuc, MDThis research aimed to develop a rosemary essential oil nanoemulsion using the phase inversion temperature method. Various factors influencing emulsion formation and characteristics, including oil phase composition, surfactant type, and mixing temperature, were investigated. The phase inversion temperature of the system was determined to be approximately 70°C. Among the surfactants evaluated, Tween 80 exhibited exceptional performance in producing nanoemulsions. Nanoemulsions containing up to 10% oil phase could be successfully formulated using 10% Tween 80. Stability testing indicated that the rosemary nanoemulsion remained stable for over 30 days. These findings hold potential for expanding the utilization of rosemary essential oil.
- Tài liệuLaboratory-scale Extraction of Essential Oil from Black Pepper(Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh University, 2019-10) Dang, Thi Cam Huong, ST; Nguyen, Dinh Phuc, MDOptimal conditions for hydrodistillation were determined as an extraction time of approximately 60 minutes, a NaCl concentration of 2%, and a water-to-material ratio of 1:15 g/mL, yielding a maximum of 2.19%. For steam distillation, the optimal parameters were 500g of material, an extraction time of about 45 minutes at an evaporation rate of 0.13 ml/s, resulting in a highest yield of 1.57%. In micro-assisted hydrodistillation, the best conditions included an extraction time of approximately 30 minutes, a water-to-material ratio of 1:4 g/mL, and an extraction power of 380W, achieving a maximum yield of 1.4%. GC-MS analysis identified 70 components, constituting 99% of the total composition. The primary compounds in black pepper essential oil were β-caryophyllene, 3-carene, D-limonene, β-pinene, and α-phellandrene.
- Tài liệuPreparation of Tamanu Oil Nanoemulsions by Phase Inversion Temperature (PIT) Method(Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh University, 2024-08) Nguyen, T. Tam; Pham, H. Danh, MSc.Tamanu oil may benefit the skin and hair due to its anti-inflammatory, antimicrobial, antioxidant, and wound-healing properties. In this study, the phase inversion temperature (PIT) method was used to prepare a stable tamanu oil nanoemulsion at the lowest surfactant content. The factors affecting the formation of nanoemulsions such as type of surfactant, surfactant to oil ratio (SOR), and water content were investigated. The results showed that Tween 80 is suitable for making a stable nanoemulsion. The SOR is more than or equal to 1.5:1 produced emulsions with particle size less than 100 nm. The particle size decreased as SOR, and water content increased. A higher quantity of surfactant caused higher turbulence and affinity towards the aqueous phase, resulting in smaller droplets. Decreasing droplet size by increasing water content may result from a decreased viscosity of the surfactant at the interface that promotes fluidity and the easy movement of the oil phase towards the aqueous phase. The SOR of 3:1 and water content of 80% were selected due to cost, taste, and toxicity concerns. The impact of storage condition on nanoemulsion stability was also investigated. After one month, samples were stored in the refrigerator had an insignificant increase in absorbance. Particle size analysis also showed a similar result (< 20 nm).
- Tài liệuStudy On Factors Affecting The Hydrolysis Of Coconut Oil(Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh University, 2022-10) Le, Tran An Vi; Do, Dinh NhatUnlike most other vegetable oils, coconut oil is about 92% saturated fatty acids and contains many medium-chain fatty acids (MCFAs); it is a prevalent ingredient in the chemical industry of fatty oil worldwide. The value of fatty acids has spurred the development of methods for producing fatty acids in coconut oil. The enzymatic hydrolysis method is an excellent way to protect the hydrolyzed product and keep some product properties as desired. The process can obtain a cleaner product, which is a primary concern in food, cosmetic, and biomedical applications. This study aimed to perform the hydrolysis of coconut oil using lipase enzyme catalysis to recover free fatty acids. Various factors affecting the degree of hydrolysis, including the ratio of coconut oil to buffer, lipase enzyme concentration, pH, temperature, and reaction time, were considered. It was found that the optimal parameters for coconut oil hydrolysis are as follows: the ratio of coconut oil to buffer of 1:4, lipase enzyme content of 3%, pH of 7.5, reaction temperature of 50 °C, and a hydrolysis time of 6 hours to achieve the highest degree of hydrolysis at 53%. This finding may contribute to enhancing the economic value of coconut oil.
- Tài liệuSynthesis Of Silver Nanoparticles Using Essential Oils And Preliminrary Examination Of Its Antibacterial Acitivity(Nguyen Tat Thanh University, Faculty Of Enviromental And Food Engineering, 2024) Phan, Nguyen Yen Nhi; Trieu, Quoc AnIn this study, silver nanoparticles (AgNPs) were synthesized green chemically from diluted acetone essential oil. The influencing parameters when synthesizing such as the effect of essential oils, the effect of pH, the effect of the concentration of the essential oil, the effect of the concentration of silver nitrate, the effect of temperature, the antibacterial ability. Structural features of biosynthesized AgNPs were determined by color observation, methods such as UV-Vis absorption spectroscopy, Dynamic Light Scattering and Transmission Electron Microscopy, which showed the spherical shape of AgNPs with the size of 28 – 80 nm. In addition, there is antibacterial activity of the suspension system of AgNPs as against gram-negative and gram-positive bacteria such as Staphylococcus Aureus (S.aureus), E.coli, Bacillus cereus.
- Tài liệuThe Adsorptive Treatment Of Methylene Blue From Aqueous Solution By Spent Coffee Grounds(Faculty Of Environmental And Food Engineering, Nguyen Tat Thanh University, 2024) Nguyen, Dinh Huy; Trieu, Quoc AnThe results obtained from using SCG as an adsorbent for the methylene blue (MB) adsorption were evaluated through the following investigations. The experiment investigating the stirring time found that the stirring time for adsorption to equilibrium was 150 min. Maximum adsorption capacity was 63.29 mg/g. The adsorption process followed the Langmuir isothermal adsorption. MB could be desorbed by adjusting the pH to 2.
- Tài liệuThe Extraction Of Rosemary Essential Oil By Microwave Assisted Distillation(Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh University, 2019-10) Mai, Thi Thuy Linh, ST; Nguyen, Dinh Phuc, MDRosemary (Rosmarinus officinalis L.) has been a significant herb with recognized antiseptic, astringent, antifungal, antibacterial, and antioxidant properties. This study aimed to optimize the microwave-assisted distillation process for extracting rosemary essential oil by investigating the effects of feed-solvent ratio, distillation power, feed leaf size, and distillation time on the yield. Optimal extraction conditions were determined as a feed-solvent ratio of 1:1, distillation power of 380W, distillation time of 25 minutes, and feed leaf size of 0.8-1 cm, resulting in a maximum yield of 2.7%. The study provided a comparative analysis of essential oil quality and quantity and proposed a mechanism for microwave-assisted extraction of rosemary essential oils.