Effect of solar radiation on the functional components of mulberry (Morus alba L.) leaves

Sugiyama, Mari; Katšube, Takao; Kôyama, Akio; Itamura, Hiroyuki

doi:10.1002/jsfa.7614

Cited by 21 publications

(23 citation statements)

References 27 publications

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“…Our previous study showed the effects of cultivation conditions on the functional component contents of mulberry leaves. Our results showed that the flavonols contents of mulberry leaves differ depending on the variety, that the amount of solar radiation affects flavonols and DNJ contents, and that the amounts of applied nitrogen affect the concentrations of chlorogenic acid, flavonol, and DNJ (Sugiyama et al, 2013(Sugiyama et al, , 2016a.…”

Section: Introductionmentioning

confidence: 66%

“…Correlation between the DNJ contents and total hours of solar radiation was not noted in the common culture field study data from May 28 to July 28, 2009 and May 24 to July 27 in 2010 (Sugiyama et al, 2016a). However, the correlation coefficients with total temperature in their study were high at r = 0.92 (P = 0.02) in 2009 and r = 0.80 (P = 0.04) in 2010, suggesting a similar trend to the present study (data not shown).…”

Section: Discussionmentioning

confidence: 89%

“…In our previous report, we found a positive correlation between flavonols contents and total hours of solar radiation by investigating the functional component contents of mulberry leaves every 10 days in common fields from May 28 to July 28, 2009 and May 24 to July 27, 2010 (Sugiyama et al, 2016a). The correlation coefficients between chlorogenic acid contents and total hours of solar radiation and total temperature in 2009 were r = 0.67 (P = 0.18) Although the chlorogenic acid contents in that study did not show a significant correlation with either total solar radiation or total temperature, the flavonols contents did have a positive correlation with total hours of solar radiation.…”

Section: Discussionmentioning

confidence: 93%

“…lower leaves, and the upper-lower leaf difference was greater for DNJ contents than flavonols (Sugiyama et al, 2016a). To determine the amounts of functional components per stock, we calculated the functional component contents for all of the leaves on one shoot ( Fig.…”

mentioning

confidence: 99%

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Seasonal Changes in Functional Component Contents in Mulberry (Morus alba L.) Leaves

Sugiyama

Katšube²,

Kôyama³

et al. 2017

The Hortic J

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The aim of this study was to determine the best time to harvest mulberry (Morus alba L.) leaves for optimal yields of functional components. Mulberry leaves were analyzed to determine the seasonal changes in the concentrations of functional components, including flavonols, chlorogenic acid, and 1-deoxynojirimycine (DNJ). During the experimental period (May 26-October 16), the ranges of flavonols, chlorogenic acid, and DNJ contents were 1134-2230 mg/100 g dry weight (DW), 616-1014 mg/100 g DW, and 53-199 mg/100 g DW, respectively. There were high flavonols contents in mulberry leaves from late May to early July, from early to mid-August, and after late September. There were high chlorogenic acid contents from late May to early July, and after late September. From late September, the flavonols contents increased over time, and showed the highest level on October 16, the last day of the experimental period. The increased flavonols contents after late September were due to the synergistic effects of solar radiation and lower temperatures. The DNJ content showed a bell-shaped curve, peaking in mid-August, and the DNJ content was strongly correlated with total temperature. The flavonols and chlorogenic acid contents in mulberry leaves were higher after late September when the temperatures decreased and there was still high solar radiation, while the DNJ content peaked in August when temperatures were highest. The results indicated that August is the best time to harvest mulberry leaves to obtain optimal yields of beneficial functional components. If mulberry leaves are harvested twice per year, then the first harvest should be in July to August when temperatures and solar radiation hours are high, and the second harvest should be completed by the end of September.

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Section: Introductionmentioning

confidence: 66%

Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 93%

mentioning

confidence: 99%

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Seasonal Changes in Functional Component Contents in Mulberry (Morus alba L.) Leaves

Sugiyama

Katšube²,

Kôyama³

et al. 2017

The Hortic J

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“…The nutritional value and antioxidant activities of mulberry leaves depend on many factors, such as the cultivar, environmental conditions, type of field, leaf age, time of harvesting, fertilizers, and mode of food administration (Matei et al, 2006;Sugiyama et al, 2016aSugiyama et al, , 2016b. Quality characteristics of mulberry leaves grown in Lithuania have been poorly investigated.…”

Section: Discussionmentioning

confidence: 99%

Influence of Harvest Time on Biologically Active Compounds and the Antioxidant Activity in Leaves of Mulberry Grown in Lithuania

Levickienė

Jarienė

Gajewski

et al. 2017

Not Bot Horti Agrobo

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The aim of this study was to establish the influence of harvest time on the contents of flavonoid compounds (rutin, isoquercetin, nicotiflorin, and astragalin) and chlorogenic acid, as well as the antiradical activity in white mulberry (Morus alba L.) leaves grown in Lithuania. Mulberry leaves contain a wide range of bioactive compounds, such as flavonoids and phenolic acids, which are responsible for beneficial effects on human health. Leaves from two mulberry cultivars were collected from July to September in 2015-2016. Quantitative determinations of four flavonoids and chlorogenic acid were conducted by HPLC method and antiradical activity using the 2.2-Diphenyl-1-picrylhydrazyl (DPPH) radical scavenging method. The results showed that the total flavonoid contents of mulberry leaves in the two cultivars ranged from 921.92 to 1512.02 mg 100 g −1 (dry matter). The highest accumulated rutin, nicotiflorin, and chlorogenic acid contents and the greatest antioxidant activity were found in the leaves of 'Plodovaja 3'. The bioactive compounds in the leaves of the mulberry cultivars varied over a period of time, where 'Turchanka' and 'Plodovaja 3' accumulated the highest total flavonoid contents in September and August, respectively. In both cultivars, the antiradical activity was highest in September. There were a very strong positive correlations between the antiradical activity as determined using the DPPH method and the chlorogenic acid contents (r = 0.887, p < 0.05) and the isoquercetin contents (r = 0.848, p < 0.05).

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Process Analysis of Mulberry (Morus alba) Leaf Extract Encapsulation: Effects of Spray Drying Conditions on Bioactive Encapsulated Powder Quality

Tchabo

Kaptso

et al. 2018

Food Bioprocess Technol

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Effect of solar radiation on the functional components of mulberry (Morus alba L.) leaves

Cited by 21 publications

References 27 publications

Seasonal Changes in Functional Component Contents in Mulberry (<i>Morus alba</i> L.) Leaves

Seasonal Changes in Functional Component Contents in Mulberry (<i>Morus alba</i> L.) Leaves

Influence of Harvest Time on Biologically Active Compounds and the Antioxidant Activity in Leaves of Mulberry Grown in Lithuania

Process Analysis of Mulberry (Morus alba) Leaf Extract Encapsulation: Effects of Spray Drying Conditions on Bioactive Encapsulated Powder Quality

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