Poster OER - Ngành Công nghệ kỹ thuật hóa học
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Đang hiển thị 1 - 5 trong tổng số 10
- 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.
- 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 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 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 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).