The comparison of the physicochemical parameters and antioxidant activity of homemade and commercial pomegranate juices

Abstract

Background. The pomegranate (Punica granatum L.) has gained a reputation as a fruit with many healthpromoting properties. It is considered to help prevent or treat various disease risk factors including high blood pressure, high cholesterol, oxidative stress, hyperglycemia and inflammatory activities. It has been demonstrated that certain components of pomegranates, such as polyphenols, have potential antioxidant, anti-inflammatory and anticarcinogenic effects. Materials and methods. Five commercially available (CA) and three homemade (HM) pomegranate (Punica granatum L.) juices were evaluated for their physicochemical properties including titratable acidity (TA), pH and total soluble solids (TSS), as well as antioxidant properties such as anthocyanin content, ascorbic acid content (AA), antioxidant activity (DPPH), total phenolic compounds (TPC) and ferric reducing antioxidant power (FRAP). Moreover, the concentrations of 18 different elements (Ca, K, Mg, P, S, Na, Cr, Cu, Fe, Mn, Mo, Sr, Zn, Al, Cd, Ni, Pb, Hg) were determined using the ICP-OES method, with prior wet mineralization Results. TA was significantly lower (P < 0.05) in homemade than in commercial juices (0.380 and 1.318% citric acid respectively). The TPC and FRAP parameters were about 50% higher in commercial than in homemade juices. Polyphenols were strongly correlated with antioxidant activity measured by FRAP and DPPH tests (r = 0.958 and 0.886 respectively), and a significant correlation for anthocyanins and vitamin C (r = 0.849) was observed. The most common mineral in each tested juice was potassium (132.69-3151.87 mg/dm

Total anthocyanin, flavonoid, polyphenol and tannin contents of seven pomegranate cultivars grown in Iran [pdf]

“…As expected, total antioxidant activity exhibited a direct correlation with total polyphenol content ( Fig. 1), in agreement with a very recent report (Dżugan et al, 2018). A number of health benefits have been attributed to pomegranates, particularly in the prevention of cardiovascular disease, neurodegenerative disorders and certain types of cancer.…”

Comparison of some physico-chemical parameters of kiwiberry (Actinidia arguta) cultivars from a cold climate

“…3. A positive correlation between total antioxidant activity and the ascorbic acid content has also been confirmed by other authors for other crops (Dżugan et al, 2018;Silva and Sirasa, 2018;Alves et al, 2018).…”

Quality and Authenticity Control of Fruit Juices-A Review

“…The determination of selected physicochemical parameters has been used to exploit potential adulteration or to classify juices according to their geographical and varietal origin [25,26,27,28,29,30]. Water and sugar addition to juice samples can be revealed through the evaluation of Brix value: A alue below the required specification indicates overdilution of the juice with water while a higher Brix value is indicative of the addition of sugar [25].…”

“…Water and sugar addition to juice samples can be revealed through the evaluation of Brix value: A alue below the required specification indicates overdilution of the juice with water while a higher Brix value is indicative of the addition of sugar [25]. Significant differences in pH, TA and Brix values were reported in different varieties of pomegranate [29] and also between homemade and commercial samples [30]. Homemade pomegranate juices had a low acid content and correspondingly higher pH than commercial juices, as acidity value is known to decrease significantly during fruit ripening.…”