Effect of brewing time and temperature on the physical properties, antioxidant activities and sensory of the kenaf leaves tea

2021 ◽  
Author(s):  
Yoon-Kang Chong ◽  
Kar-Lin Nyam
Keyword(s):  
Physical Properties ◽  
Antioxidant Activities ◽  
Brewing Time

scholarly journals EFFECT OF DIFFERENT GUM TYPES ON STABILITY OF ANTIOXIDANT COMPONENTS AND PHYSICAL PROPERTIES OF SPRAY DRIED POUZOLZIA ZEYLANICA POWDER

2018 ◽  
Vol 55 (5A) ◽  
pp. 10
Author(s):  
Nguyen Duy Tan
Keyword(s):  
Particle Size ◽  
Moisture Content ◽  
Physical Properties ◽  
Water Activity ◽  
Antioxidant Activities ◽  
Radical Scavenging ◽  
Gum Arabic ◽  
Color Difference ◽  
Antioxidant Power ◽  
The Stability

The objective of this study was to investigate effect of blending three types of different gum (arabic, carrageenan and xanthan) in Pouzolzia zeylanica extract together with maltodextrin as well as encapsulated material during spray-drying process on the stability of antioxidant components (anthocyanin, flavonoid, polyphenol, tannin and antioxidant activities through DPPH radical scavenging capacity, ferrous reducing/antioxidant power FRAP and antioxidant ability index AAI); and physical properties (moisture content, water activity, particle size and morphology as well as the color, nonenzymatic browning) of products. The results showed that the sample which was blended with arabic gum and maltodextrin maintained well bioactive compounds and obtained powder had better quality characteristics than others. In this optimal sample, the content of anthocyanin, flavonoid, polyphenol and tannin were determined as 7.56 ± 0.106 mgCE/100 g, 31.15 ± 1.035 mgQE/g, 27.96 ± 0.380 mgGAE/g, 25.79 ± 0.530 mgTAE/g. The antioxidant activity through DPPH, FRAP and AAI were determined as 75.55 ± 0.65%, 102.87 ± 3.85 mM FeSO4/g and 38.17 ± 11.24. The moisture content, water activity, particle size, the color value of (L, a, b), total color difference (DE) and non enzyme browning (NEB) were determined as 6.42 ± 0.085 %, 0.5142 ± 0.0076, 6.26 ± 0.110 µm, 78.43 ± 0.189, 7.55 ± 0.065, 6.96 ± 0.180, 18.85 ± 0.580 and 0.298 ± 0.015, respectively.

scholarly journals Effect of Drying Method on Proximate Content, Physical Properties and Antioxidant Activities of Powder Gading, Manggala, and Lumut Snake Fruit Kernel

2016 ◽  
Vol 3 (3) ◽  
pp. 114
Author(s):  
Sri Anggrahini ◽  
Agam Gumawang
Keyword(s):  
Antioxidant Activity ◽  
Physical Properties ◽  
Powder Processing ◽  
Antioxidant Activities ◽  
Total Soluble Solid ◽  
Sun Drying ◽  
Significant Difference ◽  
Powder Samples ◽  
Soluble Solid ◽  
Feasible Alternative

<p>Sun drying is usually used during drying  snake fruit kernel powder processing before roasting. However, powder productions become hampered during raining season due to its highly weatherdepended. Cabinet drying can possibly be feasible alternative. The aim of research was to compare and describe the effect of sun drying and cabinet drying on proximate content, physical properties, and antioxidant activity of snake fruit kernel powder from Gading, Pondoh Manggala, and Pondoh Lumut varieties.  Each of snake fruit kernel from Gading, Pondoh Manggala, and Pondoh Lumut, was divided and dried under two conditions, i.e. 3 days sun drying and cabinet drying at a temperaure of 60°C for 18 hours. Then dried kernel  was roasted at a temperature of 180°C for 30 minutes, grinded, sifted using 40 mesh sieve to obtain snake fruit kernel  powder. Samples were analyzed for their proximate content, solubility, total soluble solid and antioxidant activity.  Results of the study showed that there was no significant difference among variables: chemical composition and solubility, but antioxidant activity and total soluble solid were significantly different. Total soluble solid of cabinet-dried snake fruit kernel powder was more higher than that of sun-dried, however antioxidant activity was more lower.   </p><p><strong>Keywords</strong>: cabinet drying, kernel powder, snake fruit,  sun drying, variety </p>

Ripening Stage and Extraction Method Effects on Physical Properties, Polyphenol Composition and Antioxidant Activities of Cumin (Cuminum cyminum L.) Seeds

2014 ◽  
Vol 69 (4) ◽  
pp. 358-364 ◽  
Author(s):  
Iness Bettaieb Rebey ◽  
Sarra Kefi ◽  
Soumaya Bourgou ◽  
Ines Ouerghemmi ◽  
Riadh Ksouri ◽  
...  
Keyword(s):  
Physical Properties ◽  
Extraction Method ◽  
Antioxidant Activities ◽  
Ripening Stage ◽  
Cuminum Cyminum ◽  
Method Effects

scholarly journals Antioxidant activities and physical properties of stirred yoghurt fortified with pomegranate peel extracts

2014 ◽  
Vol 59 (2) ◽  
pp. 207-212 ◽  
Author(s):  
Marwa M. El-Said ◽  
H.F. Haggag ◽  
Hala M. Fakhr El-Din ◽  
A.S. Gad ◽  
Azza M. Farahat
Keyword(s):  
Physical Properties ◽  
Antioxidant Activities ◽  
Pomegranate Peel

scholarly journals Characterization on antioxidant and physical properties of gelatin based composite films with incorporation of Centella asiatica (pegaga) extract

Food Research ◽  
2019 ◽  
Vol 4 (1) ◽  
pp. 224-233
Author(s):  
N.N.M. Nazmi ◽  
Norizah Mhd. Sarbon
Keyword(s):  
Physical Properties ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Antioxidant Activities ◽  
Uv Light ◽  
Composite Films ◽  
Reducing Power ◽  
Centella Asiatica ◽  
Total Phenolic ◽  
Mechanical And Physical Properties

This study aimed to characterize the influence of Centella asiatica at 0.3% and 0.7% on antioxidant activities; mechanical and physical properties of chicken skin gelatin/CMC/ Centella asiatica film. Characterization of the blended films with 0.7% Centella asiatica extract shows higher antioxidant activities with a total phenolic content of 0.36 mg/g of GAE, DPPH of 89.26%, and reducing power of 0.80 nm compared to 0.3% Centella asiatica extract added where the total phenolic content was 0.29 mg/g of GAE, DPPH of 89.26% and reducing power of 0.80 nm. The addition of 0.3% of Centella extract provide higher value in tensile strength, elongation at break, melting point and transparency but lower in UV-light penetration and crystallinity of the films. While the addition of 0.7% Centella extract contributes to higher value in WVP and puncture test. In conclusion, the incorporation of Centella asiatica extracts on film greatly increased antioxidant levels and improved some of the mechanical and physical properties of the film blends.

scholarly journals Effects of Various Drying Methods on Selected Physical and Antioxidant Properties of Extracts from Moringa oliefera Leaf Waste

2020 ◽  
Vol 12 (20) ◽  
pp. 8586
Author(s):  
Ade Chandra Iwansyah ◽  
Tran Dinh Manh ◽  
Yusuf Andriana ◽  
Muhammad Aiman bin Hessan ◽  
Faridah Kormin ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Physical Properties ◽  
Antioxidant Activities ◽  
Antioxidant Properties ◽  
Total Flavonoid ◽  
Total Phenolic ◽  
Drying Methods ◽  
Sun Drying ◽  
Phenolic Contents ◽  
Tray Drying

This study aims to evaluate the effects of different drying methods on the physical properties, total phenolic content, total flavonoid content, and antioxidant activity of extracts from Moringa oliefera L. (MO) leaf waste. The effects of two drying techniques, namely, sun drying (A1) and tray drying (A2), on the physical and antioxidant properties of the extracts obtained using three extracting solvents, i.e., water (b1), ethanol (b2), and ethyl acetate (b3), were investigated. These extracts were analyzed for their physicochemical and antioxidant properties. The antioxidant properties were determined with the Folin Ciocalteau, aluminum chloride, and 1,1-diphenyl-2-picrylhydrazyl (DPPH) assays. Fourier transform infrared spectrophotometry (FTIR) was used to identify functional groups in the active compounds. It was found that the physical properties of the MO extract, including yield, pH, total solids, and color, showed significant differences for the two drying methods (p < 0.05). The b3 extract had the highest value for total phenolic contents, total flavonoid contents, and antioxidant activities, followed by b2 and b1, respectively, for both the sun drying and tray drying methods. There was a significant correlation between the total phenolic and flavonoid contents and antioxidant activity (IC50). This study reveals that waste material from MO leaves could be utilized as an antioxidant agent, which is expected to reduce environmental pollution from the MO processing industry.

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