Premium
Phenolic content and ferric reducing–antioxidant power of cow's milk produced in different pasture‐based production systems in southern Brazil
Author(s) -
Kuhnen Shirley,
Moacyr Juliana R,
Mayer Jaqueline K,
Navarro Bruno B,
Trevisan Rafael,
Honorato Luciana A,
Maraschin Marcelo,
Pinheiro Machado Filho Luiz C
Publication year - 2014
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.6654
Subject(s) - grazing , forage , pasture , agroecology , composition (language) , antioxidant , zoology , food science , biology , agronomy , chemistry , agriculture , ecology , linguistics , philosophy , biochemistry
BACKGROUND Phenolic compounds are widely present in forage. However, few studies have been carried out to investigate the presence of these compounds in animal products such as milk. In this study, the total phenolic content ( TPC ) and ferric reducing–antioxidant power ( FRAP ) of milk produced under agroecological and conventional management systems in southern Brazil were determined. Three systems were compared: (a) agroecological, with intensive rotational grazing, also known as Voisin grazing ( ECO ); (b) semi‐intensive conventional ( SIC ); and (c) conventional grazing ( CGR ) ( n = 8 per group). Pastures with distinct and more diverse botanical composition were observed on the ECO farms. RESULTS Significantly ( P < 0.05) lower amounts of TPC were found in agroecologically produced milk in autumn and summer and the CGR system showed the highest FRAP value ( P < 0.05) for the samples collected in autumn. Positive correlations where found between the TPC and FRAP values obtained for the milk samples (0.198, P < 0.05), milk FRAP and forage TPC values (0.344, P < 0.05), and the TPC and FRAP values obtained for the forage (0.70, p < 0.01). PCA applied to the UV spectra dataset (200–350 nm) clearly distinguished the samples collected from the ECO system in the winter. CONCLUSION Our results revealed that, under the conditions prevalent in southern Brazil, since the cows were allowed to graze in all of the systems, the TPC and antioxidant capacity of the milk samples showed minimal variation. However, since the forage TPC and FRAP values for the milk were correlated, TPC appears to be a promising variable for the purpose of monitoring forage prior to its selection aimed at enhancing the antioxidant activity of milk. © 2014 Society of Chemical Industry