Clarification of the Algerian grape juice and their effects on the juice quality

Abstract

<jats:p>The aim of this study was to find a good clarification method to eliminate the substances in Algerian grape juice and study the effects of the clarification agents on juice quality. The clarified grape juice was subjected to different treatments, namely bentonite, gelatin, combination of gelatin and bentonite, then stored for 4 weeks. The effects of fining treatment by determining the critical micillary concentration of each agent used accelerated stability test on turbidity, tannin contents (ethanol index, condensed tannins, total polyphenol and anthocyanins) and microbiological quality of clarified grape juice were evaluated during storage. Fining treatment and storage had a significant (p &lt; 0.05) effect on turbidity, tannins, total polyphenol, condensed tannins and anthocyanins. However, a better percentage elimination was noted for freshly squeezed grape juice with a combination of gelatin and bentonite corresponding to a turbidity of 6.5 NTU. The clarifiers separately gave lower removal rates than average, up to 83% of tannins present in the freshly squeezed juice has been eliminated using the bentonite. The results obtained are very satisfactory since we were able to obtain a clear juice of good microbial quality while ensuring the preservation of the organoleptic and nutritional qualities during the treatment and the storage of the juice.&#x0D; &#x0D; Bull. Chem. Soc. Ethiop. 2020, 34(1), 1-11.&#x0D; DOI: https://dx.doi.org/10.4314/bcse.v34i1.1</jats:p>

Effect of Extraction Methods on Polyphenols, Flavonoids, Mineral Elements, and Biological Activities of Essential Oil and Extracts of Mentha pulegium L.

“…However, there is increasing need to provide a scientific basis for the traditional use of different plants and plant parts. For this reason, this study aimed to provide in-depth information on the extraction of essential oil, methanolic extract, biological activities, and mineral compositions of Mentha pulegium L. It is part of an overall program in our laboratory for studying natural food samples relevant to human health and nutrition [ 16 , 17 , 18 , 19 , 20 , 21 ]. The results of this study will be useful in enriching the database of Algerian medicinal herbs, advancing the knowledge on medicinal plants, and deepening the scientific understanding of the medicinal, elemental, and bioactive compounds and antimicrobial properties of Mentha pulegium .…”

Application of natural fining agents to clarify fruit juices

“…The clarifying efficiency of gelatin, bentonite, and their mixture on grape juice was investigated by Mazrou et al. (2020). They found that utilization of fining agents in combination form could successfully reduce the turbidity of fresh grape juice from 152 to 6.5 NTU in clarified type.…”

“…The results showed that Ca-alginate-AC beads can be introduced as an effective adsorbent for removal of patulin from contaminated apple juice. The clarifying efficiency of gelatin, bentonite, and their mixture on grape juice was investigated by Mazrou et al (2020). They found that utilization of fining agents in combination form could successfully reduce the turbidity of fresh grape juice from 152 to 6.5 NTU in clarified type.…”

Contribution of Grape Juice to Develop New Isotonic Drinks With Antioxidant Capacity and Interesting Sensory Properties

“…Phenolic compounds are the most abundant compounds followed by sugars and acids ( 41 ). They play a major role in prevention of various diseases caused by oxidative stress ( 50 ). The phenolic compounds found in grape juice are those extracted from grape skins and seeds ( 42 ).…”

“…The interest of consumers and the food industry in polyphenols has been growing, because there is a relationship between their intake and prevention of various diseases ( 50 , 54 ). Accordingly biological activities of polyphenols in grape juice are linked to their antioxidant, anti-inflammation, anticancer, anti-aging, antimicrobial, and cardioprotective properties ( 58 ).…”