Effect of different drying methods on the physical properties and antioxidant activities of Hibiscus cannabinus leaves

2019 ◽  
Vol 13 (2) ◽  
pp. 1279-1286 ◽  
Author(s):  
Yan Yi Sim ◽  
Kar Lin Nyam
Keyword(s):  
Physical Properties ◽  
Antioxidant Activities ◽  
Hibiscus Cannabinus ◽  
Drying Methods

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.

The Impact of Drying Methods on Paper Physical Properties

2012 ◽  
Vol 602-604 ◽  
pp. 2267-2272
Author(s):  
Shu Lei Zhao ◽  
Zheng Yuan Wei ◽  
Xiao Tian Ding ◽  
Qiang Lin
Keyword(s):  
Physical Properties ◽  
Vacuum Drying ◽  
Drying Methods ◽  
Mechanical Pulp ◽  
Bursting Strength ◽  
Tensile Index ◽  
Chemical Pulp ◽  
Drying Conditions ◽  
The Impact ◽  
Tearing Resistance

This paper experimentally examined the impact of four different drying methods (free drying, press drying, vacuum drying and impingement drying) on paper physical properties including roughness, elongation, air permeance, tearing resistance, tensile index and bursting strength. The handsheets materials are HWBKP (Hardwood Bleached Chemical Pulp), SWBKP (Softwood Bleached Chemical Pulp), CTMP (Chemical Thermo mechanical Pulp) and ATMP (Advanced Thermo Mechanical Pulp). Good experimental data were obtained for the four pulps under different drying conditions. The results of our investigation indicate that press drying have lower surface roughness, elongation and air permeance but higher tearing resistance; the vacuum drying have higher roughness, tensile index and bursting strength; the impingement drying have lower tearing resistance, tensile index and bursting strength but higher elongation and air permeance. Selection of different drying conditions for effective productivity and quality improvement potential is proposed as a direction for the future dryer design.

Effect of Drying on the Bioactive Compounds and Antioxidant Activity of Rubus lambertianus

2018 ◽  
Vol 14 (2) ◽  
Author(s):  
Jun Yu ◽  
Zijian Shangguan ◽  
Xingju Yang ◽  
Dan Sun ◽  
Baoqing Zhu ◽  
...  
Keyword(s):  
Bioactive Compounds ◽  
Freeze Drying ◽  
Antioxidant Activities ◽  
Drying Methods ◽  
Protective Effects ◽  
Red Raspberry ◽  
Hot Air Drying ◽  
Hot Air ◽  
Freeze Dried ◽  
Total Anthocyanins

AbstractDifferent drying methods, including hot air drying (HAD), freeze drying (FD), spray drying and vacuum drying (VD), were investigated to determine their influence on the chromatic coordinates, phenolics, anthocyanins and antioxidant activities of dried red raspberry (Rubus lambertianus). Pelargonidin-3-O-glucoside and catechin were found to be the main anthocyanin and non-anthocyanin phenolics, respectively, in fresh red raspberry. The most effective method for controlling browning was FD. The highest protective effects against bioactive compounds were observed in freeze-dried powders, when measuring the total anthocyanins, the scavenging of DPPH (1,1-diphenyl-2-picrylhydrazyl) and hydroxyl radicals and the inhibition effects on lard oxidation. HAD was effective for the preservation of total phenolics, while VD was useful for protecting catechin and procyanidin B1.

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