scholarly journals Possibility of Pulsed Electric Field and Essential Oil Pre-treatment, Microwave-air Dehydration to the Quality of the Dehydrated Sesban (Sesbania sesban) Flower

2021 ◽  
Author(s):  
Nguyen Phuoc Minh
Keyword(s):  
Essential Oil ◽  
Vitamin C ◽  
Electric Field ◽  
Air Temperature ◽  
Phenolic Content ◽  
Pulsed Electric Field ◽  
Sesbania Sesban ◽  
Significant Difference ◽  
Air Dehydration ◽  
Microbial Stability

Non-heat ahead-treatment in advance of the main dehydration is essential to preserve the quality and ensure food safety. Pulsed electric field (PEF) utilizes a high-voltage electric field in a very short duration to inhibit microbes and enzymes while maintaining the most sensory and nutritional characteristics. For thermal sensitive components, the dehydration process should be performed at low temperatures. Freeze dehydration, vacuum dehydration required high cost for equipment, energy consumption, low quantity in long dehydration time. Microwave-air dehydration is considered as a promising alternative technical approach. Sesban (Sesbania sesban) flower contains numerous phytochemical components promoting health-benefit. However, it’s highly perishable after harvesting. Consumers enjoy the dried sesban flower as a healthy drink. This study examined the possibility of PEF ahead-treatment in microbial inhibition and enzymatic inactivation; essential oil and Microwave-air dehydration on retention of total phenolic content (TPC), vitamin C, 2,2 diphenyl-1-picrylhydrazyl of free radical scavenging (DPPH), ferric reducing antioxidant power (FRAP) of the dehydrated sesban flower. Research also monitored the microbial stability of the dehydrated sesban flower during 12 months of preservation. Results showed that PEF at pulse strength 1000 kV/cm, pulse duration 90 µs, pulse number 45 was remarkably inactivated polyphenol oxidase and peroxidase in raw material. Rosemary essential oil soaked for sesban flower before dehydration positively preserved the ascorbic acid, phenolic content and antioxidant capacity. These PEF and essential oil ahead-treatments strongly facilitated for the main Microwave-air dehydration. Among different air temperatures from 20°C to 40°C in microwave-air dehydration, the highest Vitamin C, TPC, DPPH and FRAP of the dried flower were recorded at air temperature from 20°C to 30°C with no significant difference. Meanwhile, airspeed 1.2 m/s showed the highest Vitamin C, TPC, DPPH and FRAP of the dried flower with no significant difference with airspeed 1.4 m/s and 1.6 m/s. There was no significant difference in Vitamin C, TPC, DPPH and FRAP of the dried flower by microwave power from 1.15 to 1.45W/g. Therefore, a combination of microwave and air dehydration at air temperature 25°C, airspeed 1.2 m/s, the microwave energy density of 1.45 W/g was recommended to better preserve vitamin C, TPC, DPPH, FRAP. Microbial stability of the dehydrated flower was also observed during 12 months of storage by 3 month-interval sampling. Coliform, yeast and mold criteria in dried product were stable within acceptable limits.

scholarly journals Selected Quality Parameters of Air-Dried Apples Pretreated by High Pressure, Ultrasounds and Pulsed Electric Field—A Comparison Study

Foods ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1943
Author(s):  
Artur Wiktor ◽  
Aleš Landfeld ◽  
Aleksandra Matys ◽  
Pavla Novotná ◽  
Magdalena Dadan ◽  
...  
Keyword(s):  
High Pressure ◽  
Electric Field ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Reference Sample ◽  
Pulsed Electric Field ◽  
Quality Parameters ◽  
High Pressure Processing ◽  
Total Phenolic ◽  
Hygroscopic Properties

The aim of this work was to compare selected physicochemical properties of air dried ‘Golden Delicious’ apples, pretreated either by high-pressure processing (HPP), ultrasound (US) or pulsed electric field (PEF). Following parameters of pretreatment were used: HPP–400 MPa for 15 min, US–21 kHz, 180 W for 45 min, PEF–1 kV/cm, 3.5 kJ/kg. The quality of materials was evaluated by their rehydration properties, hygroscopicity, color and total phenolic content. To compare the effectiveness of the utilized methods, determined properties were expressed as relative comparison values against the reference sample obtained without any pretreatment in the same conditions. The performed research demonstrated that properties can be shaped by the application of proper pretreatment methods. For instance, PEF was shown to be the best method for improving water uptake during rehydration, whereas HPP was the most effective in decreasing hygroscopic properties in comparison with untreated dried apples. Among the investigated methods, HPP resulted in the deepest browning and thus total color difference, while the effects of US and PEF were comparable. For all pretreated dried apples, the total phenolic content was lower when compared with reference material, though the smallest drop was found in sonicated samples.

Effects of high-intensity pulsed electric field processing conditions on lycopene, vitamin C and antioxidant capacity of watermelon juice

2009 ◽  
Vol 115 (4) ◽  
pp. 1312-1319 ◽  
Author(s):  
Gemma Oms-Oliu ◽  
Isabel Odriozola-Serrano ◽  
Robert Soliva-Fortuny ◽  
Olga Martín-Belloso
Keyword(s):  
Vitamin C ◽  
Electric Field ◽  
Antioxidant Capacity ◽  
High Intensity ◽  
Pulsed Electric Field ◽  
Processing Conditions ◽  
Watermelon Juice

Chilling prior to low intensity pulsed electric field processing improved vitamin C stability of carrot purée (Daucus carotacv. Nantes)

2015 ◽  
Vol 50 (8) ◽  
pp. 1757-1763 ◽  
Author(s):  
Sze-Ying Leong ◽  
Indrawati Oey ◽  
Danielle Clapperton ◽  
Kemal Aganovic ◽  
Stefan Toepfl
Keyword(s):  
Vitamin C ◽  
Electric Field ◽  
Pulsed Electric Field ◽  
Low Intensity ◽  
Carrot Puree

Inactivation of Salmonella Typhimurium in Orange Juice Containing Antimicrobial Agents by Pulsed Electric Field

2002 ◽  
Vol 65 (7) ◽  
pp. 1081-1087 ◽  
Author(s):  
ZIWEI LIANG ◽  
GAURI S. MITTAL ◽  
MANSEL W. GRIFFITHS
Keyword(s):  
Cell Death ◽  
Electric Field ◽  
Cell Viability ◽  
Salmonella Typhimurium ◽  
Orange Juice ◽  
Antimicrobial Agents ◽  
Ph Value ◽  
Pulsed Electric Field ◽  
Pulse Number ◽  
Significant Difference

Combinations of different hurdles, including moderately high temperatures (<60°C), antimicrobial compounds, and pulsed electric field (PEF) treatment, to reduce Salmonella in pasteurized and freshly squeezed orange juices (with and without pulp) were explored. Populations of Salmonella Typhimurium were found to decrease with an increase in pulse number and treatment temperature. At a field strength of 90 kV/cm, a pulse number of 20, and a temperature of 45°C, PEF treatment did not have a notable effect on cell viability or injury. At and above 46°C, however, cell death and injury were greatly increased. Salmonella numbers were reduced by 5.9 log cycles in freshly squeezed orange juice (without pulp) treated at 90 kV/cm, 50 pulses, and 55°C. When PEF treatment was carried out in the presence of nisin (100 U/ml of orange juice), lysozyme (2,400 U/ml), or a mixture of nisin (27.5 U/ml) and lysozyme (690 U/ml), cell viability loss was increased by an additional 0.04 to 2.75 log cycles. The combination of nisin and lysozyme had a more pronounced bactericidal effect than did either nisin or lysozyme alone. An additional Salmonella count reduction of at least 1.37 log cycles was achieved when the two antimicrobial agents were used in combination. No significant difference (P > 0.05) in cell death was attained by lowering the pH value; only cell injury increased. Inactivation by PEF was significantly more extensive (P < 0.05) in pasteurized orange juice than in freshly squeezed orange juice under the same treatment conditions. This increase might be due to the effect of the chemical composition of the juices.

scholarly journals Enhancement of the Antioxidant, Anti-Tyrosinase, and Anti-Hyaluronidase Activity of Morus alba L. Leaf Extract by Pulsed Electric Field Extraction

Molecules ◽  
2020 ◽  
Vol 25 (9) ◽  
pp. 2212
Author(s):  
Wantida Chaiyana ◽  
Jakkapan Sirithunyalug ◽  
Suvimol Somwongin ◽  
Chanun Punyoyai ◽  
Natnaree Laothaweerungsawat ◽  
...  
Keyword(s):  
Electric Field ◽  
Leaf Extract ◽  
Phenolic Content ◽  
Pulsed Electric Field ◽  
Morus Alba ◽  
Total Phenolic ◽  
Frap Assay ◽  
Antioxidant Power ◽  
Hyaluronidase Activity

In this study we aimed to compare the chemical composition and biological activity between Morus alba L. leaf extract obtained with 95% v/v ethanol using a pulsed electric field (PEF) and the conventional maceration method. Extracts of M. alba leaves collected from Chiang Mai (CM), Sakon Nakon (SK), and Buriram (BR), Thailand, were investigated for 1-deoxynojirimycin content by high-performance liquid chromatography and for total phenolic content by the Folin–Ciocalteu method. Antioxidant activity was investigated by 2,2′-diphenyl-1-picrylhydrazyl (DPPH), 2,2’-azinobis-3-ethylbenzothiazoline-6-sulphonate (ABTS), and ferric reducing antioxidant power (FRAP) assay. Anti-tyrosinase and anti-hyaluronidase activity was investigated by in vitro spectrophotometry. The results show that this is the first study to indicate PEF as a novel method for enhancing the phenolic content and antioxidant, anti-tyrosinase, and anti-hyaluronidase activity of M. alba leaf extract (P < 0.05). PEF extract of M. alba leaves collected from BR had comparable ABTS•+ scavenging activity to l-ascorbic acid and comparable anti-tyrosinase activity to kojic acid (P > 0.05). On the other hand, PEF extract of M. alba leaves collected from SK exhibited significantly high anti-hyaluronidase activity, comparable to that of oleanolic acid (P > 0.05). Therefore, PEF is suggested for further M. alba leaf extraction in the production of natural whitening and anti-aging cosmetic ingredients.

scholarly journals The Effect of Traditional and Non-Thermal Treatments on the Bioactive Compounds and Sugars Content of Red Bell Pepper

Molecules ◽  
2020 ◽  
Vol 25 (18) ◽  
pp. 4287
Author(s):  
Katarzyna Rybak ◽  
Artur Wiktor ◽  
Dorota Witrowa-Rajchert ◽  
Oleksii Parniakov ◽  
Małgorzata Nowacka
Keyword(s):  
Vitamin C ◽  
Electric Field ◽  
Bioactive Compounds ◽  
Sugar Content ◽  
Combined Treatment ◽  
Pulsed Electric Field ◽  
Bell Pepper ◽  
Thermal Treatments ◽  
Total Carotenoids ◽  
Bell Peppers

The aim of the study was an investigation of the effect of traditional and non-thermal treatment on the bioactive compounds of red bell pepper. As a thermal process, blanching in water and in steam was studied, while for non-thermal the sonication, pulsed electric field treatment and their combination were used in this experiment. The red bell peppers were evaluated based on quality attributes such as: total carotenoids content; polyphenols; vitamin C; antioxidant activity and sugars content. Vitamin C and sugar content were analyzed using liquid chromatography and other measurements were determined based on the spectrophotometric method. Results showed that the blanching in water or in steam reduced bioactive compounds concentration; whereas non-thermal treatments as pulsed electric field (PEF) applied separately or in combination with ultrasound (US + PEF) let to obtain similar or slightly lower content of bioactive compounds in comparison to untreated peppers. When sonication (US) and combined treatment as PEF + US were applied; in most cases reduction of bioactive compounds concentration occurred. This effect was probably related to the effect of relatively long (30 min) ultrasound treatment. The application of appropriate parameters of non-thermal processing is crucial for the high quality of processed material.

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