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Thi Luyen Cao,Rayhan Ahmed Shawon,Tea Heon Lee,Nathan Cho,Ho Cheol Kim,Seoa Yoon,Soon Im Hong,Yang Gyu Ku 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
The cultivation and consumption of asparagus have increased worldwide, owing to its bioactive and nutrient compound contents that are beneficial to human health. Asparagus extract has been applied in cosmetic and pharmaceutical industries, among others. The cultivation techniques, surrounding environmental conditions, and cultivars affect the asparagus spear productivity, sensory property, biochemical composition and content, and bioactivity. However, the effects of different levels of shade on plant growth characteristics as well as phenolic compound content and antioxidant activity of male asparagus cultivars have not been extensively investigated. Therefore, the objective of this study was to investigate the effects of different levels of shade treatment (30% and 70% shade) on the plant growth characteristics, total polyphenol and flavonoid contents, and 2,2’-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radical scavenging activity of male asparagus cultivars (Atticus, Avalim, and Herkolim). Two-month-old asparagus seedlings were cultivated in a rain-shelter house and were treated with different levels of shade. The plant growth characteristics were determined at the first four months of the conduction. Spears harvested from eleven-month-old plants were frozen, lyophilized, and ground for the determination of the polyphenol and flavonoid contents and ABTS scavenging activity. The results showed that shade treatment affected the bud number and diameter, root number, and root length and diameter of the asparagus cultivars. Among the three examined cultivars, Avalim produced more shoot than Atticus and Herkolim after being grown for six weeks. The bud and root numbers of Avalim were significantly higher than those of Herkolim under the 30% shade condition, but its bud and root diameter were smaller than those of Herkolim under the control condition. Shade treatment at 30% and 70% caused decreases in the polyphenol content and ABTS scavenging activity. Under the control condition, polyphenol content in Herkolim spears was significantly higher than that in Atticus and Avalim spears, whereas polyphenol content in Atticus spears was significantly higher than that in the other two cultivars under shade treatment. We believe that our study makes a significant contribution to the literature because findings from this study could be used for the establishment of strategies to produce spears with high marketable and total yields as well as high quality.
Thi Luyen Cao,Rayhan Ahmed Shawon,Nathan Cho,Tae Heon Lee,Baul Ko,Ho Cheol Kim,Jong Hyang Bae,Yang-Gyu Ku 한국원예학회 2022 원예과학기술지 Vol.40 No.3
This study examined the effects of 30% and 70% shading on the growth characteristics, phenolic content, and antioxidant activity of three male cultivars (Atticus, Avalim, and Herkolim) of asparagus grown in a rain-shelter house. The 70% shading treatment significantly increased the shoot elongation rate of all three male cultivars compared with the control and 30% shade treatments. Compared with the control treatment, 30% shading increased the shoot production rate and bud number of the Atticus and Avalim cultivars. Most of the plant growth characteristics of the Herkolim cultivar were not affected by the 30% shade treatment, except root diameter. Polyphenol contents in all three cultivars were significantly decreased under the 30% shade treatment compared with that in the plants under the control and 70% shade treatments. The Atticus cultivar had a higher polyphenol content than that in the Avalim and Herkolim cultivars under shade treatments. The flavonoid contents in Atticus and Avalim plants under the 30% shade treatment were lower than that in plants under the control treatment. Compared with the control treatment, the 30% shade treatment sig- nificantly decreased antioxidant enzyme activities such as superoxide dismutase, catalase, and peroxidase as well as the 2,2'-azino-bis3-ethylbenzothiazoline-6-sulphonic acid (ABTS) free-radical scavenging activity of Atticus and Herkolim. Under the 30% shade treatment, the polyphenol and flavonoid contents in the Atticus cultivar were significantly higher than those in the Avalim cultivar. The results suggest that the 30% shade treatment can be applied in the cultivation of the Atticus cultivar to improve spear production in the following season and minimize decreases in phenolic content.
Active gum karaya/Cloisite Na<sup>+</sup> nanocomposite films containing cinnamaldehyde
Cao, Thi Luyen,Song, Kyung Bin IRL Press 2019 Food hydrocolloids Vol.89 No.-
<P><B>Abstract</B></P> <P>Gum karaya (GK) is an inexpensive and abundant source of polysaccharides in tropical countries. GK can be used for biodegradable film preparation without further extraction. In this study, active GK nanocomposite films containing Cloisite Na<SUP>+</SUP> (CLS) and cinnamaldehyde (CIN) were developed. The physical properties of the GK films were examined. The dispersion of GK (2.5%, w/v) and glycerol (55% of gum, w/w) exhibited film-forming capacity. Addition of CLS enhanced the physical properties of the films by the intercalation of GK molecules into the layered structure of CLS nanoparticles. This structure was elucidated in the X-ray diffraction pattern of the GK nanocomposite films. In particular, the tensile strength of the GK film containing 11% CLS was increased by 73%, compared to that of the GK film without CLS. Water solubility and water vapor permeability of the GK films were decreased with the addition of CLS. Moreover, the incorporation of 0.25%, 0.50%, and 0.75% CIN caused the increase in elongation at break of the GK film containing 11% CLS by 60%, 82%, and 43%, respectively. Furthermore, the addition of CLS and CIN increased the opacity of the GK films. The GK film containing 11% CLS and 0.75% CIN exhibited antimicrobial activities against the tested pathogens. Thus, the results in this study suggest that the GK/CLS nanocomposite films containing CIN can be applied as an active packaging material.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Gum karaya can be used as a novel material for biodegradable film preparation. </LI> <LI> Active gum karaya/Cloisite Na<SUP>+</SUP> films containing cinnamaldehyde were prepared. </LI> <LI> Physical properties of the nanocomposite films were improved. </LI> <LI> The nanocomposite films with cinnamaldehyde exhibited anitimicrobial activity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Rayhan Ahmed Shawon,Seo Yeon Ha,Tae Heon Lee,Thi Luyen Cao,Ho Cheol Kim,Jong Hyang Bae,Yang Gyu Ku 한국원예학회 2021 원예과학기술지 Vol.39 No.1
The objective of this study was to investigate the influence of a shade treatment on plant growth characteristics, bud break, and spear number of five asparagus (Asparagus officinalis L.) cultivars (Apollo, Atlas, Grande, UC157, and Walker Deluxe) and determine the most appropriate cultivar for cultivation in a shaded rain-shelter house. For the experiment, two-month-old seedlings were grown in the rain-shelter house with 30% shade using polyethylene film on the roof of the rain-shelter house, whereas the control plants were grown in a rain-shelter house without the additional layer of polyethylene. The shade treatment significantly increased the plant height, shoot number, shoot number per week, and bud number, but did not affect the mean number of days to bud break. The number of spears on asparagus grown in the shade was significantly higher than in the control. Under the shade treatment, Walker Deluxe and UC157 showed significantly higher shoot number and shoot number per week than the other cultivars. Compared to other cultivars, Walker Deluxe produced the highest bud number. In the control condition, Grande produced a higher number of shoots, shoots per week, buds, and roots than in the shade treatment. However, the shade treatment increased the ratio of spear numbers to bud numbers of Grande, resulting in a higher number of spears. Walker Deluxe with shade treatment had higher shoots, shoots per week, buds, roots, and spears than the control. These results suggest that Grande is more suited for growth in a rain-shelter house without shade treatment but that Walker Deluxe is more appropriate for cultivating in a rain-shelter house with 30% shade.