Antioxidant Activity, Polyphenol Content, and Related Compounds in Different Fruit Juices and Homogenates Prepared from 29 Different Pomegranate Accessions

Abstract

Pomegranate juice is well known for its health beneficial compounds, which can be attributed to its high level of antioxidant activity and total polyphenol content. Our objective was to study the relationships between antioxidant activity, total polyphenol content, total anthocyanins content, and the levels of four major hydrolyzable tannins in four different juices/homogenates prepared from different sections of the fruit. To this end, 29 different accessions were tested. The results showed that the antioxidant activity in aril juice correlated significantly to the total polyphenol and anthocyanin contents. However, the homogenates prepared from the whole fruit exhibited an approximately 20-fold higher antioxidant activity than the level found in the aril juice. Unlike the arils, the antioxidant level in the homogenates correlated significantly to the content of the four hydrolyzable tannins in which punicalagin is predominant, while no correlation was found to the level of anthocyanins.

Comparative Study between Extracts of Different Pomegranate Parts Issued from Five Tunisian Cultivars (Punica granatum L.): Phytochemical Content, Volatile Composition and Biological Activity

“…Our results corroborate with numerous studies suggesting that pomegranate peel extract has more potential for health as a natural antioxidant-rich dietary supplement than arils extract. In previous studies Gill et al, (2000) than Tzulker et al, (2007) deduced that the antioxidant activity of pomegranate juice with higher levels of peel residues was two to twenty times higher than pomegranate juice prepared only with arils.…”

“…This power is attributed probably to the effect of hydrolysable tannins and an ellagitannin, known as punicalagin, present in all pomegranate cultivars (Tzulker et al, 2007). That's why significant inter-cultivar and interorgan variation was revealed in Table 1.…”

Pomegranate – a tropical fruit rich in bioactive compounds with health-promoting properties

“…Aktywność przeciwutleniająca owoców granatu i składników w nich zawartych była przedmiotem wielu badań (Borochov-Neori i in., 2009;Gil i in., 2000;Mertens-Talcott i in., 2006;Sadeghi i in., 2009;Singh i in., 2002;Sudheesh i Vijayalakshmi, 2005;Tzulker i in., 2007). Na właściwości przeciwutleniające granatu wpływa wiele czynników, głównie są to: odmiana i stopień dojrzałości owoców, warunki klimatyczne uprawy oraz część anatomiczna owocu, która została poddana analizie.…”

Evaluation of Antioxidant Activity of Pomegranate Molasses by 2,2-Diphenyl-l-Picrylhydrazyl (DPPH) Method

“…Antioxidants are compounds that have the ability to scavenge free radicals and protect the human body from oxidative stress, the main key factor for the occurence of cancers and heart diseases [28]- [30]. Reference [31] stated that the antioxidant level in pomegranate juice was higher than found in many fruit juices, such as blueberry, cranberry, and orange.…”