3rd Edition of Euro-Global Conference on Biotechnology and Bioengineering

June 14-15 | Online Event

June 14-15, 2023 | Online Event
ECBB 2023

Kheira Zerrouki

Kheira Zerrouki, Speaker at Biotechnology Conference
University of Mostaganem, Algeria
Title: Antibacterial effect of phenolic extract of olive tree on some pathogenic bacteria


Phenolic metabolites (polyphenols) exhibit a series of biological properties that promotes human health. Olive tree (Olea europaea) can confer significant benefits to the human health, which motivated us to undertake the present study on its main benefits molecules (polyphenols) especially of other olive parts that are less used in humain therapy, since there are numerous findings about olive oil. The main objectiv of the present study was to valorize some parts of  olive to evaluate  their antibacterial effect in order to contribute to the development of an understanding of nutritional and clinical use. For this,  total polyphenols were extracted from two  algerian olive varieties (O. europaea); Chemlal and Sigoise using methanol. The polyphenol content was  0.17 ± 0.0006 and 0.05 ± 0.0031 μg / ml for the pulp  and 0.0015 ± 0.12 and 0.08 ± 0,001μg / ml for the core respectively for the two varieties. Olive leaves had  0.08 ± 0.001 mg / ml of polyphenols. Leaves ethyl acetate extracts have shown  high phenolic content (0.139 ± 0.011 μg / ml). Higher amounts (0.10 ± 0.001and 0.11 ± 0.0032 μg / ml) were registred for  pulp and core respectively of the variety Sigoise. Antibacterial tests showed significant results  represented by inhibition areas of 22 mm ± 1.41 for Staphylococcus aureus and Salmonella enteritidis and only 8.5 mm ± 0.71 for Listeria monocytogenes. No  effect was observed  for  Escherichia coli.  According to the results of this study, olive parts, especially leaves  can be considered as a good source of antimicrobial agents that can be provided with a very low price and then can be used in medicine. For that, it is very interesting to continue valorizing other varieties of olive as described in the present study or for the other uses

Audience Take Away Notes :

  • It is very interesting to try all parts of plat for molecules extraction to show whish kind and part of plant used.
  • This research could help for other studies. It has provided information that all the plant can be used in all its parts


Dr. ZERROUKI Kheira has studied Biology at Mostaganem university in Algeria. Biology Engineering in 1998. Then I joined the research group of Prof RIAZI Ali in his laboratory at Mostaganem university as researcher in Microbiology. Obtained Master degree . I carried out my Doctoral studies in many laboratories: In Spain (Nutrition department with polyphenols group supervised by Prof, Rosa Lamuela Raventus; and with Prof. Franz Martin (antioxidant activity), then Prof. Thonart Phillipe has allowed me to work on dates biomolecules. I received my PHD degree in 2020. I have published 3 articles on different subjects; Nutrition, health and Microbiology which are my main areas of interest. 
- Member of the LMBAFS laboratory (beneficial microorganisms, functional foods and health) at the University of Mostaganem
- Member of the group (palm date group) at the UAE
- Member of ISANH (International Society of Antioxidants) in France
Having participated in several national and international conferences and congresses.