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1

Study on antioxidant activity of phenolic acids present in coffee

100%

Konczal M., Zielinski R.

Towaroznawcze Problemy Jakości. Polskie Towarzystwo Towaroznawcze

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2008

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nr 2

72-79

2

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Effects of salinity stress on growth and phenolics of rice (Oryza sativa L.)

100%

Minh L. T., Khang D. T., Ha P. T. T., Tuyen P. T., Minh T. N., Quan N. V., Xuan T. D.

International Letters of Natural Sciences

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2016

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tom 57

This study was conducted to determine the correlation between of salinity stress on growth and phenolic compounds in rice. It was observed that salinity stress caused a significant decrease in shoot lengths, fresh and dry weights of all rice varieties. Under salinity stress, changes of chemical contents also differed among phenolic compounds and rice cultivars. Total phenolics and flavonoids, and contents of vanillin and protocatechuic acid in tolerant varieties were strongly increased, whereas in contrast, they were markedly reduced in the susceptible cultivar. Ferulic acid and p-coumaric acid were detected only in tolerance rice. Vanillin and protocatechuic acid may play a role, but ferulic acid and p-coumaric acid may be much involved in the tolerant mechanism against salinity stress. Ferulic acid and p-coumaric acid and their derivatives are potent to be exploited as promising agents to reduce detrimental effects of salinity stress on rice production.

3

Natural phenolic acids may increase serum estradiol level in ovariectomized rats

80%

Zych M., Folwarczna J., Trzeciak H. I.

Acta Biochimica Polonica

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2009

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tom 56

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nr 3

503-507

Natural phenolic acids are commonly present in plants consumed in the diet. Recently we have observed that different natural phenolic acids exert differential effects on the body mass gain in ovariectomized and non-ovariectomized female rats. The aim of the present study was to investigate the effects of ferulic, caffeic, p-coumaric and chlorogenic acids on serum estradiol and total cholesterol levels in ovariectomized and non-ovariectomized rats. The experiments were carried out on 3-month old female Wistar Cmd:(WI)WU rats, divided into following groups (n = 8 in each group): non-ovariectomized control rats and non-ovariectomized rats receiving ferulic, caffeic, p-coumaric or chlorogenic acids, sham-operated control rats, ovariectomized control rats and ovariectomized rats receiving the same phenolic acids. The phenolic acids were administered at a dose of 10 mg/kg p.o. daily for 4 weeks. Serum estradiol and total cholesterol levels on the next day after the last administration of the phenolic acids were examined. The phenolic acids did not affect serum estradiol or total cholesterol levels in non-ovariectomized rats. In ovariectomized rats, caffeic acid and to a lesser extent p-coumaric acid increased serum estradiol level, which effect correlated with a decreased body mass gain. All the phenolic acids decreased serum cholesterol level in ovariectomized rats. Concluding, the anti-obesity activity of some phenolic acids may be, at least partially, connected with estrogenic pathways.

4

The effect of methyl jasmonate and phenolic acids on growth of seedlings and accumulation of anthocyanins in common buckwheat (Fagopyrum esculentum Moench)

80%

Horbowicz M., Mioduszewska H., Koczkodaj D., Saniewski M.

Acta Agrobotanica

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2009

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tom 62

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nr 1

The effect of methyl jasmonate (JA-Me) and phenolic acids: trans-cinnamic acid (t-CA), p-coumaric acid (p-CA), salicylic acid (SA) as well as naringenine (NAR) on growth of seedlings and accumulation of anthocyanins in common buckwheat (Fagopyrum esculentum Moench) were studied. JA-Me and phenolics were applied to growth medium of 4-days etiolated buckwheat seedlings before their exposition to day/night (16h/8h) conditions. The increase of primary roots and hypocotyls length were measured after 3 days of seedling growth in such conditions. At the end of experiment the total anthocyanins contents were measured as well. Methyl jasmonate (JA-Me) and trans-cinnamic acid (t-CA) inhibited growth of the primary root in young buckwheat seedlings, while naringenine (NAR) had a stimulatory influence, and p-coumaric acid had no effect at all. None of investigated phenolics or JA-Me had an effect on the growth of buckwheat hypocotyls, except the mixture of JA-Me and p-coumarcic acid. JA-Me significantly decreased the anthocyanins level in buckwheat hypocototyls, but not in cotyledons. trans-Cinnamic acid, p-coumaric acid and naringenine had no significant influence on the anthocyanin level in hypocotyls and cotyledons of buckwheat seedlings. Simultaneous treatment of buckwheat seedlings with JA-Me and t-CA or p-CA did not change the inhibition of anthocyanins accumulation in buckwheat hypocotyls by JA-Me. In the hypocotyls of buckwheat treated with a mixture of JA-Me and NAR, or SA, a synergistic reduction of anthocyanins was observed.

5

Response of maize, pea and radish roots to allelochemical stress

80%

Gmerek J., Politycka B.

Acta Biologica Cracoviensia. Series Botanica

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2011

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tom 53

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nr 1

We examined whether allelochemical stress leads to increased lipoxygenase activity in roots of sweet maize (Zea mays L. ssp. saccharata), pea (Pisum sativum L.) and radish (Raphanus sativum L. var. radicula). The lipoxygenase activity of soluble and membrane-bound fractions was assessed in roots after exposure to ferulic and p-coumaric acids. Lipid peroxidation and membrane injury were determined as indicators of stress. Increased lipoxygenase activity of both studied fractions was followed by lipid peroxidation and plasma membrane injury. The results suggest the key role of lipoxygenase in plasma membrane injury during allelochemical stress caused by administration of hydroxycinnamic acids.

6

Sklad i wlasciwosci przeciwrodnikowe fenolokwasow slodu

61%

Samotyja U., Malecka M., Klimczak I.

Żywność Nauka Technologia Jakość

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2002

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tom 09

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nr 3

67-76

Kwasy fenolowe należą do istotnych składników roślinnych surowców żywnościowych ze względu na ich przeciwutleniające właściwości. W pracy oznaczono ogólną zawartość związków fenolowych oraz zidentyfikowano i dokonano ilościowej analizy następujących fenolokwasów: ferulowego, kawowego, sinapinowego i p-kumarowego w słodzie wyprodukowanym z dwóch odmian jęczmienia. W największych ilościach występował kwas ferulowy. Ponad 90% kwasów fenolowych występowało w postaci związanej. Dokonano również oceny właściwości przeciwrodnikowych kwasów fenolowych zidentyfikowanych w słodzie. Największą aktywność przeciwrodnikową w teście z DPPH' wykazał kwas sinapinowy.

7

Sklad frakcji wolnych fenolokwasow w piwie

61%

Samotyja U., Malecka M., Klimczak I.

Przemysł Fermentacyjny i Owocowo-Warzywny

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2002

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tom 46

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nr 03

29-31

W pracy przedstawiono warunki izolacji i chromatograficznego rozdziału wolnych fenolokwasów w piwie. W próbkach piwa pochodzących z różnych browarów zidentyfikowano i oznaczono ilościowo następujące kwasy: wanilinowy, kawowy, syringinowy, p-kumarowy, ferulowy i sinapinowy. Badane piwa charakteryzowały się zróżnicowanym profilem wolnych kwasów fenolowych. W największych ilościach występował kwas ferulowy; który stanowił 48-58% wszystkich wolnych fenolokwasów. Różnice między średnimi zawartościami w obrębie poszczególnych fenolokwasów były istotne statystycznie.