Poster OER - Ngành Công nghệ thực phẩm
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Đang duyệt Poster OER - Ngành Công nghệ thực phẩm theo Ngày phát hành
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- Tài liệuMicroencapsulation Of Roselle (Hibiscus Sabdariffa L.) Anthocyanins: Effects Of Drying Conditions On Some Physicochemical Properties And Antioxidant Activities Of Spray-Dried Powder(Department of Food Technology, Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh University, Vietnam, 2024) Nguyen, Quoc Duy; Dang, Thanh Thuy; Nguyen, Thi Van Linh; Nguyen, Thi Thuy Dung; Nguyen, Nhu NgocAnthocyanins are important phytochemical compounds in nature that are of interest not only for their health benefits such as antioxidant, anti-inflammatory, and anti- carcinogenic properties, but also for their role in imparting attractive and characteristic color to food products. In this study, anthocyanins from hibiscus (Hibiscus sabdariffa L.) calyces were microencapsulated by spray-drying technique using maltodextrin as the carrier. The experiment was carried out in the full factorial design with two factors, namely inlet temperature (150, 160, and 170°C) and anthocyanin to maltodextrin mass ratio (1:50, 1:60, 1:70, 1:80, 1:90, and 1:100) with the aim of investigating the effect of spray drying conditions on phenolic content, anthocyanin, antioxidant activity, and color of spray-dried hibiscus powder. The results showed that increasing the carrier ratio significantly reduced the antioxidant content and their activities in the powder. However, the high level of carriers exhibited a protective effect in encapsulating anthocyanin compounds into the maltodextrin matrix, which was demonstrated by high encapsulation efficiency (>85%) observed in the samples prepared at a ratio of 1:100. It should be highlighted that although high temperature (170°C) reduced total anthocyanin concentration, it actually enhanced total phenolic content. In addition, the moisture content of the powder declined with increasing carrier ratio and inlet temperature, and it was found to be in the range of 5.57%– 10.19% in the powder. With solubility greater than 93.71%, the total phenolic and total anthocyanin content of spray-dried hibiscus powder were 31.5–41.9 (mg gallic acid equivalent/g of dry powder) and 6.08–10.47 (mg cyanidin-3-glucoside/g of dry powder), respectively. [6]
- Tài liệuGelatin/Carboxymethyl Cellulose Edible Films: Modification Of Physical Properties By Different Hydrocolloids And Application In Beef Preservation In Combination With Shallot Waste Powder(Department of Food Technology, Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh University, Vietnam, 2024) Tran, Thi Tuong Vi; Nguyen, Nhu Ngoc; Nguyen, Quoc Duy; Nguyen, Tran Phong; Lien, Tuyet NganIn this work, a gelatin/carboxymethyl cellulose (CMC) base formulation was first modified by using different hydrocolloids like oxidized starch (1404), hydroxypropyl starch (1440), locust bean gum, xanthan gum, and guar gum. The properties of modified films were characterized using SEM, FT-IR, XRD and TGA-DSC before selecting of best-modified film for further development with shallot waste powder. SEM images showed that the rough or heterogeneous surface of the base was changed to more even and smooth depending on the hydrocolloids used while FTIR results demonstrated that a new NCO functional group nonexistent in the base formulation was found for most of the modified films, implying that the modification led to the formation of this functional group. Compared to other hydrocolloids, the addition of guar gum into the gelatin/CMC base has improved its properties such as better color appearance, higher stability, and less weight loss during thermal degradation, and had minimal effect on the structure of resulting films. Subsequently, the incorporation of spray-dried shallot peel powder into gelatin/CMC/guar gum was conducted to investigate the applicability of edible films in the preservation of raw beef. Antibacterial activity assays revealed that the films can inhibit and kill both Gram-positive and Gram-negative bacteria as well as fungi. It is noteworthy that the addition of 0.5% shallot powder not only effectively decelerated the microbial growth but also destroyed E. coli during 11 days of storage (2.8 log CFU g-1) and the bacterial count was even lower than that of uncoated raw beef on day 0 (3.3 log CFU g-1).
- Tài liệuThe Microwave-assisted Extraction Of Anthocyanins, Total Phenolic Compounds And The Antioxidant Activity In Morus Nigra l. (Black Mulberry) Grown In The Da Lat City, Lam Dong Province, Vietnam(Department of Food Technology, Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh University, Vietnam; College of Agriculture, Can Tho University, Can Tho City, Vietnam; Department of Chemical Technology, Nong Lam University, Ho Chi Minh City, Viet Nam, 2024) Lam, Chan Tai; Nguyen, Thi Ngoc Lan; Tran, Thanh Truc; Mai, Huynh Cang; Nguyen, Hong Khoi NguyenMorus nigra L. (Black mulberry) is a nutritious fruit that contains many bioactive compounds such as anthocyanins, polyhenol and antioxidant activity. The microwave-assisted extraction method (MAE) is an advanced method with due to its advantages of short extraction time and lower solvent consumption. The objective of this research is to find the appropriate conditions to extract the highest contents of anthocyanin, polyphenol and antioxidant activity in black mulberry by MAE method. The pH-differential method is used to determine the anthocyanin content, the polyphenol content is determined by the Folin-Ciocalteu method and the antioxidant activity is determined by the DPPH method. The highest contents of these coumponds were obtained as follows anthocyanin contents 128.07 mg/L, polyphenol contents 4305.38 mg/L and antioxidant activity 2715.68 μmol/L when extracted under conditions of concentration of ethanol 60o, solid to solvent ratio 1:30, microwave power 600W, microwave-assisted extraction time 2 minutes.
- Tài liệuMicroencapsulation of roselle (Hibiscus sabdariffa L.) anthocyanins: Effects of different carriers on selected physicochemical properties and antioxidant activities of spray-dried and freeze-dried powder(Trường Đại học Nguyễn Tất Thành (Công nghệ thực phẩm), 2024) Quoc, Duy Nguyen; Thanh, Thuy Dang; Thi, Van Linh Nguyen; Thi, Thuy Dung Nguyen; Nhu, Ngoc NguyenAnthocyanins are abundant phytochemicals in nature that draw the public interest not only in their health effects, such as antioxidant, anti-inflammatory and anti-carcinogenic properties. It also showed their function in providing foodstuffs with appealing and distinctive color. In this study, anthocyanins from hibiscus (Hibiscus sabdariffa L.) calyces were microencapsulated by spray drying and freeze drying techniques using a wide variety of carriers including maltodextrin (MD), gum Arabic (GA) and their binary blends with inulin (INU) and konjac glucomannan (KON). The results showed that freeze-dried hibiscus powder using KON as carrier had the highest phenolic, anthocyanin and antioxidant activity, followed by spray-dried and freeze-dried MD/KON samples, which indicated the role of KON in the effective retention of antioxidants during the drying process. In addition, the ferric and cupric ion reduction activity (FRAP and CUPRAC) of the spray- dried samples was significantly higher than those of the freeze-dried powder. However, in terms of encapsulation efficiency (EE) of anthocyanins, KON was shown to be ineffective in entrapping these compounds in microcapsules with the lowest EE of freeze-dried KON and spray-dried MD/KON of 43.6% and 55.4%, respectively. By contrast, MD/GA was the most effective carrier, retaining anthocyanins inside the carrier matrix and limiting their loss to the surface of the microcapsules in both spray-drying and freeze-drying methods (EE of 91.8% and 95.7%, respectively). In addition, the moisture content of spray-dried powder samples was significantly higher than that of lyophilized powders, and the solubility of all samples was above 94.1%. [6]
- Tài liệuEffects of Infrared Drying Conditions and Maltodextrin Addition on Some Physicochemical Characteristics of Avocado (Persea americana) Pulp Powder(Trường Đại học Nguyễn Tất Thành (Công nghệ thực phẩm), 2024) Thi, Van Linh Nguyen; Quoc, Duy Nguyen; Thi, Thuy Dung Nguyen; Phuoc, Bao Duy NguyenIn this study, avocado pulp with a good nutritional profile and economic value was dehydrated using infrared drying to produce pulp powder, which shows potential application in nutritional supplements. An experimental design with two factors, namely maltodextrin level (0% and 9%) and infrared temperature (ranging from 65 to 80 ºC), was used. Responses related to the physicochemical properties of the resulted powder were observed, including peroxide value, total polyphenols, total chlorophylls, antioxidant activity, and color parameters (L*, a*, and b* values). The quality of dried products may be harmed by drying either at a high temperature or for an extended period of time. The coating substance maltodextrin was found to be beneficial in limiting unexpected changes in avocado pulp subjected to infrared drying. The highest quality of dried avocado could be obtained via infrared drying of avocado pulp with 9% maltodextrin at 70 ºC, as illustrated by the exceptional retention of total polyphenols, total chlorophylls, and antioxidant activity, being 95.1, 95.2, and 94.4%, respectively. Moreover, the short drying time (35–55 min) led to the minimization of lipid oxidation and the absence of peroxide compounds in all sample [4]
- Tài liệuBioactive Compounds From Red Cabbage By Microwave-Assisted Extraction: Anthocyanins, Total Phenolic Compounds And The Antioxidant Activity(Department of Food Technology, Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh University, Vietnam; College of Agriculture, Can Tho University, Can Tho City, Vietnam; Department of Chemical Technology, Nong Lam University, Ho Chi Minh City, Viet Nam, 2024) Nguyen, Hong Khoi Nguyen; Le, Ngoc Truc Phuong; Phan, Thi Kieu Linh; Tran, Thanh Truc; Mai, Huynh CangRed cabbage (Brassica oleracea L. var. Capitata f. Rubra) is a vegetable known for its antioxidant activity and rich nutrient composition, especially anthocyanin compounds. The objective of this research is to determine optimal conditions to yield the highest contents of anthocyanin, polyphenol and antioxidant activity from red cabbage with the microwave-assisted extraction method (MAE). Anthocyanin was evaluated based on the pH-differential method, the Folin-Ciocalteu method was used to evaluate the polyphenol content, antioxidant activity based on the DPPH free radical scavenging method. The results showed that, extraction conditions consisting of ethanol concentration of 60o, solid to solvent ratio of 1:30, microwave power of 600W and microwave-assisted extraction time of 2 minutes, gave the highest anthocyanin content at 73.89 mg/L.The content of polyphenol reached 5244.88 mg/L and the antioxidant activity was 1739.4 μmol/L.
- Tài liệuGreen Removal Of Unpleasant Volatiles From Soapberry (Sapindus Mukorossi) Extracts By Two- Phase Microbial Fermentation Fortified With Pomelo Peel Waste(Department of Food Technology, Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh University, Vietnam, 2024) Nguyen, Quoc Duy; La, Quoc Duy; Nguyen, Nhu Ngoc; Nguyen, Thi Ngoc LanSoapberry (Sapindus mukorossi Gaertn) is a popular woody plant in Vietnam, often used as a cleaning product due to its ability to wash, foam and emulsify due to high saponin content. In this study, the performance of fermentation by two microbial strains, namely Saccharomyces cerevisiae active dry yeast (ADY) and Levilactobacillus brevis lactic acid bacteria (LB) along with the addition of pomelo peel (flavedo) was evaluated during 15 days in terms of sugar removal, antioxidant and antibacterial activities, foaming power, volatile composition, and sensory acceptability. The results showed that the soluble solid content of original extracts experienced a significant decrease from 14.5% to a stable range of 9.4–11.0% until day 15 for all fermented samples, which correlated with a reduction by approximately 60% in reducing sugars (from 12.52 g L−1 to 4.77–6.56 g L−1). In addition, the saponin content of fermented extracts was in the range of 118.2–145.0 mg L−1 while antioxidant activities were extremely reduced after 15 days of fermentation. Increases in pomelo peel imparted fermented extracts with greater antibacterial activity against Staphylococcus aureus ATCC 6538, Proteus mirabilis ATCC 25933, and Candida albicans ATCC 10231, and LB had higher activity than ADY overall. Regarding the volatile profiles, two main compounds in the original extracts, including trilaurin (75.02%) and 1-dodecanoyl-3-myristoyl glycerol (24.85%), were completely removed and replaced by new alkanes, alkenes, alcohols, esters, and organic acids, and particularly D-limonene (86.34–95.31%) upon pomelo addition. Additionally, the foaming ability and stability of fermented extracts were also enhanced and there was clear distinction between fermented and unfermented samples using principal component analysis based on sensory liking data which showed consumers' preference towards fermented samples with a high percentage of pomelo peel. [6]
- Tài liệuComparison of Phytochemical Contents, Antioxidant and Antibacterial Activities of Various Solvent Extracts Obtained from ‘Maluma’ Avocado Pulp Powder(Trường Đại học Nguyễn Tất Thành (Công nghệ thực phẩm), 2024) Thi, Van Linh Nguyen; Quoc, Duy Nguyen; Nhu, Ngoc Nguyen; Thi, Thuy Dung NguyenAlthough avocado is a superfood rich in phytochemicals with high antioxidant activities, studies on the antibacterial properties of its pulp are limited, except for seed and peel portions. In this study, three types of solvent (acetone, methanol, and diethyl ether) were used to obtain the extracts from “Maluma” avocado pulp powder prepared by infrared drying. The extracts were analyzed for total polyphenols, phytopigments (total chlorophylls and carotenoids), antioxidant activities (ferric-reducing antioxidant power (FRAP), 2,2-Diphenyl-1-picrylhydrazyl (DPPH), and 2,2-azinobis(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) assays), and antibacterial activities against seven pathogens (Shigella sonnei ATCC 9290, Escherichia coli ATCC 8739, Salmonella typhi ATCC 6539, Vibrio parahaemolyticus ATCC 17802, Proteus mirabilis ATCC 25933, Staphylococcus aureus ATCC 6538, and Bacillus cereus ATCC 11778). The results showed that the acetone solvent could extract the highest polyphenols and chlorophylls with the highest antioxidant activity in terms of ABTS and DPPH assays. In contrast, diethyl ether exhibited the most significant content of carotenoids and FRAP values. However, the methanol extract was the best solvent, exerting the strongest antibacterial and meaningful antioxidant activities. For the bacterial activities, Gram-positive pathogens (Bacillus cereus and Staphylococcus aureus) were inhibited more efficiently by avocado extracts than Gram-negative bacteria. Therefore, the extracts from avocado powder showed great potential for applications in food processing and preservation, pharmaceuticals, and cosmetics. [5]
- Tài liệuDrying kinetics and changes of total phenolic content, antioxidant activity and color parameters of mango and avocado pulp in refractance window drying(Trường Đại học Nguyễn Tất Thành (Công nghệ Thực phẩm), 2024) Thi, Van Linh Nguyen; Quoc, Duy Nguyen; Phuoc Bao Duy NguyenRefractance window drying is an innovative technology belonging to the fourth generation of drying technologies that could enhance the quality of the dried product and improve the drying process. In this study, two factors with the type of fruit pulps (avocado and mango) and drying temperature (ranging from 80 to 95 ºC) were investigated. Results showed that in refractance window drying, the evaporation process rapidly occurred, mainly in the falling-rate period with undetectable constant-rate period. The Weibull was the best fit model among eight investigated mathematical models that could determine the drying behavior. The effective diffusivity was found to be from 4.25×10-10 m2/s to 7.24×10-10 m2/s for avocado pulp, and from 4.50×10-10 m2/s to 10.67×10-10 m2/s for mango pulp when the drying temperature was changed from 80 to 95 ºC. Moreover, the corresponding activation energy was 32.06 and 66.03 kJ/mol for avocado and mango pulp moisture evaporation, respectively, and the highest quality of powders of both dried pulps was obtained after processing at 90°C. The refractance window drying revealed a high potential in the production of fruit powders from avocado and mango due to the high retention of more than 80% of total phenolic content (TPC) and antioxidant activity. TPC could be used as a useful criterion for the evaluation of the drying process in terms of dried product quality [5]
- Tài liệuKinetic Study on Chlorophyll and Antioxidant Activity from Polyscias fruticosa (L.) Harms Leaves via Microwave- Assisted Extraction(Trường Đại học Nguyễn Tất Thành (Công nghệ Thực phẩm), 2024) Thi, Thuy Dung Nguyen; Quoc, Duy Nguyen; Thi, Van Linh NguyenPolyscias fruticosa (L.) leaves contain significant bioactive compounds with high antioxidant activity such as chlorophylls, total polyphenols, etc. but these have still been underutilized. In this study, the kinetics of chlorophyll and antioxidant activity extraction from P. fruticosa leaves by microwave-assisted extraction (MAE) were investigated. Microwave power was 300, 450, or 600 (W); the ratio of material/solvent varied from 1:40 to 1:80 (g/mL). In this study, the second-order kinetic model successfully predicted the change of chlorophyll and antioxidant activity during MAE. The increase of microwave power or/and the solvent amount increased saturated extraction efficiency and the extraction rate constant. However, the saturated concentration of chlorophyll and antioxidant activity increased with the increment of microwave power and the decrease in solvent amount. [4]