Investigating the Commercial Microwave Vacuum Drying Conditions on Physicochemical Properties and Radical Scavenging Ability of Thai Green Tea

2013 ◽  
Vol 32 (1) ◽  
pp. 47-54 ◽  
Author(s):  
Sathira Hirun ◽  
Niramon Utama-ang ◽  
Quan V. Vuong ◽  
Christopher J. Scarlett
Keyword(s):  
Physicochemical Properties ◽  
Green Tea ◽  
Radical Scavenging ◽  
Vacuum Drying ◽  
Microwave Vacuum Drying ◽  
Radical Scavenging Ability ◽  
Drying Conditions

scholarly journals Characterization of The Physicochemical Properties, Antioxidant Activity, And Antiproliferative Activity of Natural Melanin From S. Reiliana

2021 ◽  
Author(s):  
Ming Lu ◽  
Mengxi Xie ◽  
Xin Fu ◽  
Miao Yu ◽  
Taiyuan Shi
Keyword(s):  
Antioxidant Activity ◽  
Physicochemical Properties ◽  
Food Additives ◽  
Radical Scavenging ◽  
Hydroxyl Groups ◽  
Health Food ◽  
Sporisorium Reilianum ◽  
High Antioxidant Activity ◽  
Radical Scavenging Ability ◽  
Dopa Melanin

Abstract This study aimed to characterize the physicochemical properties and stability of L-25 melanin extracted from Sporisorium reilianum (S. reiliana). The results showed that the maximum absorption wavelength of melanin was 215 nm. Reducing agents, heat, light, microwaving, oxidants, and common food additives did not affect the melanin. Additionally, it has a good metal stability except Mn2+. The IR spectra revealed the presence of O-H, N-H, C=O, and C=C bonds as well as carboxyl, alcohol hydroxyl, and phenolic hydroxyl groups and a pyran ring. L-25 melanin could be defined as DL-hydroxy phenylalanine (DOPA)-melanin. The antioxidant and antiproliferative were also measured. The melanin has a specific stability and high antioxidant activity, including a strong DPPH free radical scavenging ability, and protected damaged HepG2 cells by reducing reactive oxygen species, malondialdehyde, and lactate dehydrogenase content. In conclusion, S. reilianum represents a novel source of melanin, that could be applied to health food or food additives. Our results show that melanin from S. reilianum is a natural pigment with good stability that has a great prospect of development and application, providing a theoretical basis and methods for its further processing and development as a functional food.

Evolution of the physicochemical properties of oil-free sweet potato chips during microwave vacuum drying

2020 ◽  
Vol 63 ◽  
pp. 102317 ◽  
Author(s):  
Ricardo Lemos Monteiro ◽  
Jaqueline Oliveira de Moraes ◽  
Jéssica Daiane Domingos ◽  
Bruno Augusto Mattar Carciofi ◽  
João Borges Laurindo
Keyword(s):  
Physicochemical Properties ◽  
Sweet Potato ◽  
Potato Chips ◽  
Vacuum Drying ◽  
Microwave Vacuum Drying

Effects of Drying Methods on Antioxidant Properties and Phenolic Content in White Button Mushroom

2012 ◽  
Vol 8 (3) ◽  
Author(s):  
Hongfang Ji ◽  
Ailin Du ◽  
Lingwen Zhang ◽  
Shuang Li ◽  
Mingduo Yang ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Content ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Total Phenolic ◽  
Vacuum Drying ◽  
Drying Methods ◽  
Button Mushroom ◽  
Microwave Vacuum Drying ◽  
White Button Mushroom

Abstract In order to explore the potential drying process, the effects of different drying methods (sun drying, hot-air drying, microwave-vacuum drying, and freeze drying) on the antioxidant properties and phenolic contents in white button mushroom fruit bodies were investigated. The Folin-Ciocalteu method was used to determine total phenolic content, while 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging, reducing power, iron-chelating ability, and hydroxyl radical scavenging activity assays were used to elucidate antioxidant activities. Results indicated that antioxidant properties in dried white button mushroom were affected by the drying methods to different extents, and phenolic contents showed significant differences (p<0.05) among different drying methods. Microwave-vacuum drying possessed the highest antioxidant activity in DPPH radical scavenging, reducing power and iron-chelating ability, respectively; and the content of phenolic compounds was 4.945 mg gallic acid equivalents (GAE) /g dry weight (DW). Sun drying was the worst in antioxidant activity and content of phenolic compounds was 1.964 mg GAE/g DW. Additionally, significantly positive correlation was found between the total phenolic content and antioxidant activity (p<0.01). As far as antioxidant activities are concerned, microwave-vacuum drying is proposed as an appropriate drying technique for white button mushroom.

Effect of microwave vacuum drying and hot air drying on the physicochemical properties of durian flour

2014 ◽  
Vol 50 (2) ◽  
pp. 305-312 ◽  
Author(s):  
Swittra Bai-Ngew ◽  
Nantawan Therdthai ◽  
Pisit Dhamvithee ◽  
Weibiao Zhou
Keyword(s):  
Physicochemical Properties ◽  
Vacuum Drying ◽  
Hot Air Drying ◽  
Air Drying ◽  
Microwave Vacuum Drying ◽  
Hot Air

scholarly journals Physicochemical Properties and Biological Activities of Silver Carp Scale Peptide and Its Nanofiltration Fractions

2022 ◽  
Vol 8 ◽  
Author(s):  
Xiao-yan Zu ◽  
Ya-jing Zhao ◽  
Shi-ming Fu ◽  
Tao Liao ◽  
Hai-lan Li ◽  
...  
Keyword(s):  
Amino Acids ◽  
Molecular Weight ◽  
Physicochemical Properties ◽  
Biological Activities ◽  
Silver Carp ◽  
Radical Scavenging ◽  
Hydrophobic Amino Acids ◽  
Radical Scavenging Ability ◽  
Molecular Weight Fractions

To explore the physicochemical properties and biological functions of silver carp scale peptide (SCSP), its molecular-weight fractions SCSP-I, II, and III obtained by nanofiltration were assessed for their solubility, emulsibility, free radical scavenging ability, effect on the proliferation of mouse B16 cells. The results showed that the solubility of each fraction of SCSP was higher than 90%, SCSP-II and III were higher than 95%. The antioxidant powers on ⦁OH, O2-⦁ and Fe3+ were ranked as SCSP-III &gt; SCSP-II &gt; SCSP-I &gt; SCSP. All fractions of SCSP had no toxic or side effects in mouse B16 melanoma cells experiments in vitro. At a concentration of 0.01 mg/mL, the tyrosinase activity of B16 cells in the SCSP-II fraction was significantly lower than that of the α-arbutin (P &lt; 0.05), at 65.37%. The molecular weight distribution of SCSP was 399–1404 Dalton and 13 peptide sequences were detected. Among them, SCSP-II contained many hydrophobic amino acids, and SCSP-III stood out for combining arginine with hydrophobic amino acids. This may be the reason why the low molecular-weight SCSPs show the strong antioxidant activity and strong tyrosinase inhibition. The work provides a data base for the development of SCSP and increases the possibility of its application.

POTENT RADICAL SCAVENGING ABILITY OF SUNPHENON: A GREEN TEA EXTRACT

2011 ◽  
Vol 35 (2) ◽  
pp. 596-612 ◽  
Author(s):  
S. KAVIARASAN ◽  
A.S. SIVAKUMAR ◽  
A. BARIK ◽  
A. KUNWAR ◽  
G.H. NAIK ◽  
...  
Keyword(s):  
Green Tea ◽  
Radical Scavenging ◽  
Green Tea Extract ◽  
Radical Scavenging Ability ◽  
Tea Extract
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