scholarly journals KINETIC MODELING, TOTAL PHENOLIC CONTENT AND COLOUR CHANGES OF MANGO PEELS DURING HOT AIR DRYING

2014 ◽  
Vol 44 (4) ◽  
pp. 301-306
Author(s):  
V. SANT’ANNA ◽  
A. S. CASSINI ◽  
L.D. F. MARCZAK ◽  
I. C. TESSARO
Keyword(s):  
Total Phenolic Content ◽  
Phenolic Content ◽  
Total Phenolic ◽  
High Concentration ◽  
Drying Temperature ◽  
B Values ◽  
Temperature Range ◽  
Drying Rates ◽  
Kinetics Of ◽  
Mango Peels

In this work, drying of mango peels was kinetically investigated within temperature range of 40-100 ºC and the applicability of several models available in literature was statistically evaluated. Midilli’s model provided the best description of the kinetics of drying mango peels with constant drying rates (k-and b-values) varying from 0.0190 to 0.0399 min-n and from 0.000404 to 0.000903 min-1, respectively, in temperature range of 40-100 ºC. High concentration of total phenolic content was obtained when drying temperature was increased up to 80 ºC. Finally, the polyphenolic degradation could be accompanied by CIELB parameters related to the yellowness of the dried samples. Keywords   In this work, drying of mango peels was kinetically investigated within temperature range of 40-100 ºC and the applicability of several models available in literature was statistically evaluated. Midilli’s model provided the best description of the kinetics of drying mango peels with constant drying rates (k-and b-values) varying from 0.0190 to 0.0399 min-n and from 0.000404 to 0.000903 min-1, respectively, in temperature range of 40-100 ºC. High concentration of total phenolic content was obtained when drying temperature was increased up to 80 ºC. Finally, the polyphenolic degradation could be accompanied by CIELB parameters related to the yellowness of the dried samples.

Immobilization of Oat Bran Polyphenols in Complex Coacervates of Whey Protein and Malthodextrin

2020 ◽  
Vol 50 (3) ◽  
pp. 460-469
Author(s):  
Damir Zyaitdinov ◽  
Alexandr Ewteew ◽  
Anna Bannikova
Keyword(s):  
Antioxidant Activity ◽  
Enzymatic Hydrolysis ◽  
Whey Protein ◽  
Bioactive Compounds ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Wall Material ◽  
Total Phenolic ◽  
Oat Bran ◽  
Kinetics Of

Introduction. Bioactive compounds are a very popular topic of modern food science, especially when it concerns obtaining polyphenols from cereals. The antiradical, antioxidant, and anti-inflammatory properties of these ingredients allow them to inhibit and prevent coronary, artery, and cardiovascular diseases, as well as several types of cancer. Encapsulation is an effective technology that protects bioactive ingredients during processing and storage. In addition, it also prevents any possible interaction with other food constituents. The research objective was to obtain effective tools of controlled delivery of bioactive compounds. The study featured whey protein as a wall material in combination with maltodextrin to encapsulate the bioactives from oat bran. Study objects and methods. The processed material was oat bran. The technology of its biotransformation was based on ultrasound processing and enzymatic hydrolysis. The antioxidant properties were determined using a coulometer of Expert – 006-antioxidants type (Econix-Expert LLC, Moscow, Russia). Separation and quantitative determination of extract were followed using a Stayer HPLC device (Akvilon, Russia) and a system column Phenomenex Luna 5u C18(2) (250×4.6 mm). The total phenolic content was measured by a modified Folin-Ciocalteu method. To prepare microcapsules, whey protein concentrate (WPC) and maltodextrin (MD) solutions were mixed at ratios 6:4, 4:6, and 5:5. After that, the mixes were treated by ultrasonication and 10% w/w of guar gum solution as double wall material. The encapsulation efficiency (EE) was determined as a ratio of encapsulated phenolic content to total phenolic content. A digestion protocol that simulates conditions of the human gastric and intestinal tract was adapted to investigate the release kinetics of the extracts. Results and discussion. Ferulic acid is the main antioxidant in cereals. Its amount during extraction was consistent with published data: 9.2 mg/mL after ultrasound exposure, 9.0 mg/mL after enzymatic extraction, and 8.6 mg/mL after chemical treatment. The antioxidant activity of the obtained polyphenols was quite high and reached 921 cu/mL. It depended on the concentration of the preparation in the solution and the extraction method. The polyphenols obtained by ultrasonic exposure and enzyme preparations proved to have a more pronounced antioxidant activity. The highest EE (95.28%) was recorded at WPC:MD ratio of 60:40. In vitro enzymatic hydrolysis protocol simulating digestion in the gastrointestinal tract was used to study the effect of capsule structural characteristics on the kinetics of polyphenol release. The percentage of o polyphenols released from capsules ranged from 70% to 83% after two hours of digestion, which confirmed the effectiveness of microencapsulation technology. Conclusion. The research confirmed the possibility of using polyphenols obtained by the biotechnological method from oat bran as functional ingredients. Eventually, they may be used in new functional products with bifidogenic properties. Whey protein can be used to encapsulate polyphenols as the wall material of microcapsules.

scholarly journals Different drying temperatures modulate chemical and antioxidant properties of mandai cempedak (Artocarpus integer)

F1000Research ◽  
2018 ◽  
Vol 7 ◽  
pp. 1706 ◽  
Author(s):  
Anton Rahmadi ◽  
Yuliana Sabarina ◽  
Sukmiyati Agustin
Keyword(s):  
Antioxidant Activity ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Ph Value ◽  
Starter Culture ◽  
Antioxidant Properties ◽  
Effect Of Temperature ◽  
Total Phenolic ◽  
Drying Temperature ◽  
Phenolic Components

Background: Mandai, the fermented inner skin of cempedak (Artocarpus integer), may have further use as industrial ingredient while maintaining its antioxidative capacity. To promote fermentation, Lactobacillus casei was induced as the starter culture. This research was carried out (i) to investigate the effect of temperature on yield, chemical properties, and antioxidant activity of starter induced fermented mandai powder, (ii) to find the best drying temperature for the powder, and (iii) to find correlations between phenolic contents and antioxidant activity of the powder. Methods: The drying temperature was used as the variable, and was set at 45, 50, and 55°C at a fixed duration of 18 hours. The control was spontaneously fermented mandai dried at 50°C for 18 hours. Total phenolic content (TPC), hydrolyzed tannic content (HTC), and total flavonoid content (TFC) were spectrophotometrically measured, expressed gallic acid (GAE), tannic acid (TAE), and catechin (CAE) equivalents. Antioxidant capacity was measured by DPPH assay.  Results: The best mandai powder had total phenolic content of 348.8±55.6 mg GAE kg-1, HTC of 143.8±9.3 mg TAE kg-1, TFC of 17.5±1.3 mg CAE kg-1, antioxidant activity (IC50) of 56.96 ppm, ash content of 4.0±0.7%, pH value of 5.0±0.8, and yield of 9.3±0.8%. There was a strong correlation between TPC, HTC, TFC, and the antioxidant activity. Conclusions: Drying temperature affected all observed parameters but not ash and pH. Temperature of 45°C emerged as the best treatment to produce mandai powder from L. casei-inoculated mandai cempedak fermentation. The antioxidant activity of mandai cempedak was contributed by the phenolic components.

scholarly journals Thai Curcuma Species: Antioxidant and Bioactive Compounds

Foods ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1219 ◽  
Author(s):  
Supawadee Burapan ◽  
Mihyang Kim ◽  
Yingyong Paisooksantivatana ◽  
Bekir Engin Eser ◽  
Jaehong Han
Keyword(s):  
Bioactive Compounds ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Radical Scavenging Activity ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Total Phenolic ◽  
Scavenging Activity ◽  
High Concentration ◽  
Food Applications

For the functional food applications, antioxidant properties and the bioactive compounds of the 23 Curcuma species commercially cultivated in Thailand were studied. Total phenolic content and DPPH radical scavenging activity were determined. The concentrations of eight bioactive compounds, including curcumin (1), demethoxycurcumin (2), bisdemethoxycurcumin (3), 1,7-diphenyl-(4E,6E)-4,6-heptadien-3-ol (4), germacrone (5), furanodienone (6), zederone (7), and ar-turmerone (8), were determined from the Curcuma by HPLC. While the total phenolic content of C. longa was highest (22.3 ± 2.4 mg GAE/g, mg of gallic acid equivalents), C. Wan Na-Natong exhibited the highest DPPH (2,2-diphenyl-1-picryl-hydrazyl-hydrate) radical scavenging activity. Twenty-three Curcuma species showed characteristic distributions of the bioactive compounds, which can be utilized for the identification and authentication of the cultivated Curcuma species. C. longa contained the highest content of curcumin (1) (304.9 ± 0.1 mg/g) and C. angustifolia contained the highest content of germacrone (5) (373.9 ± 1.1 mg/g). It was noteworthy that 1,7-diphenyl-(4E,6E)-4,6-heptadien-3-ol (4) was found only from C. comosa at a very high concentration (300.7 ± 1.4 mg/g). It was concluded that Thai Curcuma species have a great potential for the application of functional foods and ingredients.

Convective drying kinetics of strawberry ( Fragaria ananassa ): Effects on antioxidant activity, anthocyanins and total phenolic content

2017 ◽  
Vol 230 ◽  
pp. 174-181 ◽  
Author(s):  
Lilia Méndez-Lagunas ◽  
Juan Rodríguez-Ramírez ◽  
Marlene Cruz-Gracida ◽  
Sadoth Sandoval-Torres ◽  
Gerardo Barriada-Bernal
Keyword(s):  
Antioxidant Activity ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Drying Kinetics ◽  
Convective Drying ◽  
Total Phenolic ◽  
Fragaria Ananassa ◽  
Kinetics Of

Influence of air drying temperature on kinetics, physicochemical properties, total phenolic content and ascorbic acid of pears

2012 ◽  
Vol 90 (3) ◽  
pp. 433-441 ◽  
Author(s):  
Nadia Djendoubi Mrad ◽  
Nourhène Boudhrioua ◽  
Nabil Kechaou ◽  
Francis Courtois ◽  
Catherine Bonazzi
Keyword(s):  
Ascorbic Acid ◽  
Physicochemical Properties ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Total Phenolic ◽  
Air Drying ◽  
Drying Temperature

scholarly journals Physicochemical properties of chili padi Centil (Capsicum frutescens) powder dried at different drying temperatures

Food Research ◽  
2020 ◽  
Vol 4 (S1) ◽  
pp. 139-144
Author(s):  
N. Hussain ◽  
N.A. Abd Rahim ◽  
N. Azhar
Keyword(s):  
Moisture Content ◽  
Physicochemical Properties ◽  
Total Phenolic Content ◽  
Water Solubility ◽  
Phenolic Content ◽  
Total Phenolic ◽  
Capsicum Frutescens ◽  
Drying Temperature ◽  
Drying Treatment ◽  
Water Holding

padi Centil (Capsicum frutescens) powder with better physicochemical properties. The effects of drying at different temperatures (50˚C, 60˚C, and 70˚C) on chili padi Centil powder was evaluated through its functional properties, including moisture content, color, water holding capacity, oil holding capacity and water solubility index as well as total phenolic content determination. Chili padi Centil powder dried at 70˚C had permitted level of moisture content (10.38%). Drying treatment at 70˚C also produced significantly smaller particle size powder (1301.1821 μm) with higher water holding capacity (2.67%), oil holding capacity (1.3%) and water solubility index (7.65%) compared to chili padi Centil dried at 50˚C and 60˚C. The powder dried at 50˚C and 70˚C showed significant visible color difference where 50˚C drying temperature resulted in intense red color powder whereas 70˚C drying temperature resulted in degraded orange color powder. The drying treatment significantly degraded the total phenolic content of chili powder.

Changes in Color and Total Phenolic Content of Different Cultivars of Persimmon during Dehydration

2008 ◽  
Vol 4 (7) ◽  
Author(s):  
Asiye Akyildiz ◽  
Feyza Kiroglu Zorlugenc ◽  
Hakan Benli ◽  
Salih Aksay ◽  
Hasan Fenercioglu
Keyword(s):  
Sensory Evaluation ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Fresh Fruit ◽  
The Other ◽  
Total Phenolic ◽  
Dehydration Process ◽  
B Values ◽  
Phenolic Contents ◽  
A Value

Changes in color and total phenolic content of different persimmon varieties (Türkay, Hachia, Morali and Fuyu) are investigated during dehydration. In all varieties, L* values were decreased during dehydration. Fresh and dehydrated Morali persimmons had a darker color than the other varieties. Fresh Fuyu and dehydrated Hachia persimmons had higher a* values. Increased a* value indicated that sample color became red. In fresh fruit, b* values of astringent varieties were higher than non-astringent persimmons. During dehydration, b* values of non-astringent persimmons (Morali and Fuyu) were decreased continuously. Hue* values of Fuyu variety were lower than the other varieties. In the dehydration process, hue* values of all varieties were decreased. In phenolic contents of dehydrated Hachia and Türkay varieties, 93.55% and 79.12% reduction were observed respectively. In sensory evaluation, dehydrated astringent and non-astringent varieties had similar scores for astringency and taste characteristics. Fuyu, Türkay and Hachia varieties had similar color scores and their scores were higher than Morali samples.

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