Improved bioaccessibility and antioxidant capacity of olive leaf ( Olea europaea L.) polyphenols through biosorption on Saccharomyces cerevisiae

2016 ◽  
Vol 84 ◽  
pp. 131-138 ◽  
Author(s):  
Hanène Jilani ◽  
Antonio Cilla ◽  
Reyes Barberá ◽  
Moktar Hamdi
Food Control ◽  
2021 ◽  
pp. 108426
Author(s):  
Fernanda Moreira Oliveira ◽  
Raquel Moreira Oliveira ◽  
Lucia Tamires Gehrmann Buchweitz ◽  
Juliana Rodrigues Pereira ◽  
Helen Cristina dos Santos Hackbart ◽  
...  

2020 ◽  
Vol 16 (3) ◽  
pp. 129
Author(s):  
Ahmad Nimatullah Al-Baarri ◽  
Heni Rizqiati ◽  
Mochammad Dicky Zulkharisma ◽  
Anang Mohamad Legowo ◽  
Ailsa Afra Mawarid ◽  
...  

<p>Pencoklatan pada buah salak disebabkan oleh aktivitas enzim polifenol oksidase (PPO) yang bereaksi dengan oksigen menghasilkan o-kuinon yang membuat warna menjadi coklat, oleh karena itu adanya penghambatan kerja enzim PPO, dapat mencegah terjadinya warna coklat pada buah. Tujuan penelitian ini adalah untuk mengetahui pengaruh aplikasi rebusan daun zaitun dalam rangka untuk mencegah terjadinya warna coklat yang dianalisis berdasarkan pada parameter penyertanya, yaitu warna, pH, gula terlarut, dan konduktivitas pada buah salak. Daun zaitun kering dilarutkan dalam air yang kemudian dimasukkan ke dalam wadah plastik berisi potongan salak. Sebagai kontrol, potongan salak disimpan dengan dan tanpa aquades. Pengamatan terhadap salak dilakukan sebanyak 7 kali selama 9 hari pada suhu kamar. Berdasarkan parameter warna, perlakuan zaitun mampu menahan warna lebih baik sebesar 28,17% pada nilai L*, 53,68% pada nilai a*, dan 27,19% pada nilai b*. pH salak dengan perlakuan zaitun dapat dijaga sehingga kenaikannya hanya sebesar 3,8% dan nilai konduktivitas hanya meningkat sebesar 18,5%. Pada parameter gula terlarut, perlakuan dengan zaitun dapat mempertahankan perubahannya sampai sebesar 4,29%. Kesimpulannya, perlakuan penambahan daun zaitun lebih baik dalam mempertahankan warna, derajat keasaman, konduktivitas dan gula terlarut pada buah salak daripada perlakuan dengan dan tanpa penambahan aquades.</p><p> </p><p><strong>Application of Olive Leaves Extract (Olea europaea L.) in Vacuum Packaging to Prevent Browning on Salacca Fruit</strong></p><p>Browning occurs due to the activity of the polyphenol oxidase (PPO) enzyme that reacts with oxygen to produce O-quinone which causes the forming of brown color on fruit. One of the methods in preventing browning is the addition of antioxidant compounds from olive leaf. The purpose of this study was to determine the effect of addition olive leaf extract in the properties of color, pH, dissolved sugar, and conductivity in snake fruit with storage at room temperature. The snake fruit was cut into 1 g in size then was set with olive leaves extract in vacuum plastic container. The treatment was repeated 7 times and the storage was conducted for 9 days in room temperature. The contact with and without aquadest was also observed as control. The results indicated that the olive leaf treatment was able to hinder color changes by 28.17% in L*, while in a* and b* could be suppressed by 53.68 and 27.19%, respectively. On the pH, the increase could be suppressed by 3.8%, while on the conductivity and dissolved sugar could be inhibited by 18.5 and 4.29%, respectively. As conclusions, the addition of olive leaf was provided better effect to maintain the color, pH, conductivity, and dissolved sugar in snake fruit than those of with and without aquadest.</p><p><strong><br /></strong></p>


Heliyon ◽  
2019 ◽  
Vol 5 (5) ◽  
pp. e01727 ◽  
Author(s):  
Bruno Testa ◽  
Silvia Jane Lombardi ◽  
Enzo Macciola ◽  
Mariantonietta Succi ◽  
Patrizio Tremonte ◽  
...  

LWT ◽  
2021 ◽  
pp. 110848
Author(s):  
Larissa Slongo Faccioli ◽  
Manuela Poletto Klein ◽  
Gabriela Ramos Borges ◽  
Carolina Silveira Dalanhol ◽  
Isabel Cristina Kasper Machado ◽  
...  

2021 ◽  
Vol 29 ◽  
pp. 204020662110633
Author(s):  
Aurora Salamanca ◽  
Paula Almodóvar ◽  
Irene Jarama ◽  
Daniel González-Hedström ◽  
Marin Prodanov ◽  
...  

Seasonal flu is caused by influenza infection, a virus that spreads easily in human population with periodical epidemic outbreaks. The high mutational rate of influenza viruses leads to the emergence of strains resistant to the current treatments. Due to that, scientific research is focusing on the development of new anti-influenza agents as alternative or complementary treatments. Olive tree ( Olea europaea L.) has been a source of ancestral remedies due to its antimicrobial activity. Thus, the aim of this study was to test the anti-influenza activity of a standardized olive leaf extract rich in elenolic acid (EA), Isenolic®, compared with oseltamivir. Isenolic® extract was characterized by High Performance Liquid Chromatography (HPLC)-Mass Spectrometry and its content in EA was determined by HPLC. Cytotoxicity, viral neuraminidase inhibitor activity and cell viability protection against influenza infection of Isenolic® were tested in vitro using sialic acid overexpressing Madin-Darby Canine Kidney cells. Isenolic® formulations showed a 4% and 8% dry basis. Oseltamivir and Isenolic® extracts showed anti-influenza activity. The 8% Isenolic® formulation showed a dose-dependent neuraminidase inhibitor activity higher than the 4% formulation, and preserved cell viability under viral infection. Thus, Isenolic® become a promising natural alternative to existing influenza treatments.


2020 ◽  
Vol 76 (1) ◽  
pp. 10-15 ◽  
Author(s):  
Nilüfer Acar-Tek ◽  
Duygu Ağagündüz

Background: Olive tree (Olea europaea, Oleaceae) leaves have been widely used in traditional herbal medicine to prevent and treat various diseases especially in Mediterranean countries. They contain several potentially bioactive compounds that may have hypoglycemic and hypolipidemic properties. Summary: The literature has recently been attempting to define the relationship between olive leaf (Olea europaea L. folium) polyphenols and a number of health problems. Oleuropein, the basic phenolic compound of olive leaf and its extract, is responsible for the characteristic bitter taste and unique aroma of olive fruits. Furthermore, it is shown that oleuropein and its hydrolyzed products have many beneficial effects on human health because of its antioxidant characters. A number of studies report that olive leaf has potentially positive effects on the parameters related to diabetes and cardiovascular diseases by various mechanisms. Besides, toxicity studies suggest that olive leaf is generally safe even at high doses. Key messages: Although current results obtained until today seem promising, the studies in this subject are usually on cell culture and animal trials. Moreover, mostly the extract forms of olive leaves are used in the studies. More randomized controlled human clinical trials with extensive toxicity studies are needed to evaluate potential health effects and safety.


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