EJPAU 2014. Zawiślak A. , Michalczyk M. CHANGES IN POLYPHENOL AND ANTHOCYANIN CONTENT AND ANTIOXIDANT ACTIVITY IN METHANOL AND WATER EXTRACTS PREPARED FROM STORED DRIED WRINKLED ROSE (<i>ROSA RUGOSA</i> THUNB.) PETALS

Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.

2014
Volume 17
Issue 4

Topic:

Horticulture

ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES

Zawiślak A. , Michalczyk M. 2014. CHANGES IN POLYPHENOL AND ANTHOCYANIN CONTENT AND ANTIOXIDANT ACTIVITY IN METHANOL AND WATER EXTRACTS PREPARED FROM STORED DRIED WRINKLED ROSE (ROSA RUGOSA THUNB.) PETALS, EJPAU 17(4), #08.
Available Online: http://www.ejpau.media.pl/volume17/issue4/abs-08.html

CHANGES IN POLYPHENOL AND ANTHOCYANIN CONTENT AND ANTIOXIDANT ACTIVITY IN METHANOL AND WATER EXTRACTS PREPARED FROM STORED DRIED WRINKLED ROSE (ROSA RUGOSA THUNB.) PETALS

Agnieszka Zawiślak, Magdalena Michalczyk
Department of Refrigeration and Food Concentrates, University of Agriculture in Kraków, Poland

ABSTRACT

The aim of the present study was to follow changes in the content of total
polyphenols and anthocyanins as well as antioxidant activity in methanol and
water extracts prepared from dried wrinkled rose (Rosa rugosa) petals
stored for a year at 21 ± 1ºC. Polyphenols were evaluated
by Folin-Ciocalteau assay and anthocyanins were determined by the pH-differential
method. Antioxidant properties were assayed by DPPH radical scavenging activity
and by measuring the reducing power of both extracts. The extracts were a rich
and stable source of polyphenols (800–1300 mg/100 g) and anthocyanins (85–150
mg/100 g). Extract antioxidant activity expressed as EC₅₀ value did
not change significantly during storage of dry material and was quite
high (0.9–1.5 g/g DPPH). Reducing power was strongly correlated with EC₅₀ (r = -0.86,
p < 0.01). The antioxidant power of both extracts correlated more closely with polyphenol content than with anthocyanins. Extracts of methanol showed better antioxidant properties
than those of water, probably due to higher polyphenol and anthocyanin content.

Key words: Rosa rugosa, dried petals, polyphenols, anthocyanins, antioxidant activity.

Agnieszka Zawiślak
Department of Refrigeration and Food Concentrates, University of Agriculture in Kraków, Poland
Phone: +48 12 662 48 09
ul. Balicka 122
30-149 Kraków
Poland
email: a.zawislak@ur.krakow.pl

Magdalena Michalczyk
Department of Refrigeration and Food Concentrates, University of Agriculture in Kraków, Poland
ul. Balicka 122
30-149 Kraków
Poland

Responses to this article, comments are invited and should be submitted within three months of the publication of the article. If accepted for publication, they will be published in the chapter headed 'Discussions' and hyperlinked to the article.