scholarly journals Olive Leaves Extract from Algerian Oleaster (Olea europaea var. sylvestris) on Microbiological Safety and Shelf-life Stability of Raw Halal Minced Beef during Display

Foods ◽  
2018 ◽  
Vol 8 (1) ◽  
pp. 10 ◽  
Author(s):  
Djamel Djenane ◽  
Diego Gómez ◽  
Javier Yangüela ◽  
Pedro Roncalés ◽  
Agustín Ariño
Keyword(s):  
Shelf Life ◽  
Olea Europaea ◽  
Thiobarbituric Acid ◽  
Total Phenolic ◽  
Array Detector ◽  
Thiobarbituric Acid Reactive Substance ◽  
Leaf Extracts ◽  
Minced Beef ◽  
Retail Display ◽  
Olea Europaéa

Oleaster (wild olive tree) by-products represent a renewable and low-cost source of biopolyphenols. Leaf extracts (sylv.OLE) of Algerian oleaster, locally called a’hachad (Olea europaea subsp. europaea var. sylvestris), were applied at 1 and 5% (v/w) to raw Halal minced beef (HMB) in order to test its safety and shelf-life prolongation during retail/display. The total phenolic compound content in the extract was 198.7 ± 3.6 mg gallic acid equivalent. Ten compounds were identified in the sylv.OLE by High Performance Liquid Chromatography/Diode Array Detector (HPLC/DAD), of which oleuropein was the most abundant (43.25%). Samples treated with 5% sylv.OLE had significantly higher antimicrobial and antioxidant effects than those treated with 1% extract (p < 0.05). The addition of sylv.OLE reduced psychrotrophic counts as well as the level of pathogens (Salmonella enterica ser. Enteritidis and Shiga toxin-producing Escherichia coli O157:H7). A thiobarbituric acid reactive substance (TBARS) value of 2.42 ± 0.11 was reached throughout six days of retail/display in control samples, while the addition of 5% sylv.OLE reduced TBARS value by 58% (p < 0.05). The presence of sylv.OLE at the tested concentrations did not negatively influence the overall acceptability and bitterness of HMB.

scholarly journals Evaluation of Phytochemical and Antioxidant Properties of 15 Italian Olea europaea L. Cultivar Leaves

Molecules ◽  
2019 ◽  
Vol 24 (10) ◽  
pp. 1998 ◽  
Author(s):  
Francesca Nicolì ◽  
Carmine Negro ◽  
Marzia Vergine ◽  
Alessio Aprile ◽  
Eliana Nutricati ◽  
...  
Keyword(s):  
Superoxide Anion ◽  
Olea Europaea ◽  
Antioxidant Activities ◽  
Antioxidant Properties ◽  
Dry Weight ◽  
Total Phenolic ◽  
Therapeutic Effects ◽  
Leaf Extracts ◽  
Olea Europaea L ◽  
Olea Europaéa

Olive leaf extracts are of special interest due to their proven therapeutic effects. However, they are still considered a by-product of the table olive and the oil industries. In order to learn possible ways of exploiting this waste for health purposes, we investigated the phytochemical profiles and antioxidant activities in the leaves of 15 Italian Olea europaea L. cultivars grown in the same pedoclimatic conditions. The phenolic profiles and amounts of their seven representative compounds were analyzed using HPLC ESI/MS-TOF. The antioxidant activities were determined using three different antioxidant assays (DPPH, ORAC, and superoxide anion scavenging assay). Wide ranges of total phenolic content (11.39–48.62 g GAE kg−1 dry weight) and antioxidant activities (DPPH values: 8.67–29.89 µmol TE mg−1 dry weight, ORAC values: 0.81–4.25 µmol TE mg−1 dry weight, superoxide anion scavenging activity values: 27.66–48.92 µmol TE mg−1 dry weight) were found in the cultivars. In particular, the cultivars Itrana, Apollo, and Maurino, showed a high amount of total phenols and antioxidant activity, and therefore represent a suitable natural source of biological compounds for use in terms of health benefits.

scholarly journals Does Spray Mango Kernel (Mangifera indica Linn.) Prolong the Shelf Life of Beef Sausages?

2015 ◽  
Vol 4 (3) ◽  
pp. 118
Author(s):  
Aly R. Abdel-Moemin
Keyword(s):  
Shelf Life ◽  
Microbial Growth ◽  
Mangifera Indica ◽  
Thiobarbituric Acid ◽  
Effective Inhibitor ◽  
Thiobarbituric Acid Reactive Substances ◽  
E Coli ◽  
Minced Beef ◽  
Mango Kernel ◽  
Odor Score

<p>The study was aimed to look at the effect of different forms of mango kernels (MK) on the shelf life of refrigerated beef sausages over 12 days of cold storage. The (MK) was chemically and microbiologically analyzed. Beef sausages were treated with MK in 3 states, as dry ground (1.5%), an extract (1.5%) and spray MK extract (1.5%) over minced beef of sausages. Two controls were used; BHT 0.02% and no additives. A series of analyses were performed after treatments; thiobarbituric acid reactive substances (TBARS), analysis of color, myoglobin and odor. The results indicated that different forms of MK added to the beef sausages had different effects on its shelf life. Furthermore, the sprayed MK extract has significantly (P ?0.05) lowered metmyoglobin (MMb) and TBARS and increased oxymyoglobin (MbO<sub>2</sub>), odor score and a* (redness) than other forms. The potential effects of the sprayed MK may be due to a cloud of droplets cover the large surfaces of minced beef sausages with efficient extracted antioxidants. MK is source of flavonoids 142mg/g F.W. GAE. The spraying of MK at 1.5% showed an improvement of <em>E. coli</em> from minced beef and beef sausages that were less than 10 cfu g<strong><sup>-1</sup></strong>. Also the concentrations of yeasts and moulds were not detected at day 12 of storage. Hierarchically, sprayed MK extract gave best results than ground MK or MK extract form which shows effective inhibitor of lipid oxidation and microbial growth of beef sausages.</p>

scholarly journals Phytochemical Properties and Anti-Proliferative Activity of Olea europaea L. Leaf Extracts against Pancreatic Cancer Cells

Molecules ◽  
2015 ◽  
Vol 20 (7) ◽  
pp. 12992-13004 ◽  
Author(s):  
Chloe Goldsmith ◽  
Quan Vuong ◽  
Elham Sadeqzadeh ◽  
Costas Stathopoulos ◽  
Paul Roach ◽  
...  
Keyword(s):  
Pancreatic Cancer ◽  
Cancer Cells ◽  
Olea Europaea ◽  
Proliferative Activity ◽  
Leaf Extracts ◽  
Olea Europaea L ◽  
Pancreatic Cancer Cells ◽  
Olea Europaéa

Selective ultrasound-enhanced enzymatic hydrolysis of oleuropein to its aglycon in olive (Olea europaea L.) leaf extracts

2017 ◽  
Vol 220 ◽  
pp. 282-288 ◽  
Author(s):  
María del Mar Delgado-Povedano ◽  
Feliciano Priego-Capote ◽  
María Dolores Luque de Castro
Keyword(s):  
Enzymatic Hydrolysis ◽  
Olea Europaea ◽  
Leaf Extracts ◽  
Olea Europaea L ◽  
Hydrolysis Of ◽  
Olea Europaéa

scholarly journals Cecropia pachystachya Leaves Present Potential to Be Used as New Ingredient for Antiaging Dermocosmetics

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Maria Fernanda Fernandes ◽  
Jessica Leiras Mota Conegundes ◽  
Nícolas de Castro Campos Pinto ◽  
Luiz Gustavo de Oliveira ◽  
Jair Adriano Kopke de Aguiar ◽  
...  
Keyword(s):  
Biological Activities ◽  
Thiobarbituric Acid ◽  
Skin Aging ◽  
Total Phenolic ◽  
Leaf Extracts ◽  
Hek 293 ◽  
Human Embryonic Kidney Cells ◽  
Glycation End Products ◽  
First Time

Several biological activities have been reported for leaf extracts of Cecropia pachystachya species, including antioxidant and wound healing activities. This study aims to report, for the first time, the antiaging potential of the hydroethanolic (HE) and the ethanolic (EE) extracts obtained from the leaves of C. pachystachya using different in vitro assays. Both HE and EE presented relevant antioxidant capacity in different models, including phosphomolybdenum, 1,1-diphenyl-2-picryl-hydrazyl (DPPH), carotene/linoleic acid bleaching, and thiobarbituric acid reactive substances (TBARS) assays. Their ability to prevent the production of advanced glycation end products (AGEs) was also evaluated, and both extracts showed important activity, especially HE. The extracts also stimulated the fibroblasts proliferation in vitro, specialized cells that produce several mediators which maintain the skin integrity and youthfulness. Cytotoxicity of the extracts was not observed for this lineage or HEK-293, human embryonic kidney cells widely used to evaluate cytotoxicity of chemical compounds. HE also exhibited the ability to inhibit the collagenase (metalloproteinase MMP-2) and elastase activities. The total phenolic and flavonoids contents were also determined. HPLC analysis revealed the presence of the flavonoids orientin and iso-orientin, which were quantified to be used as chemical markers. The results suggested that the extracts of C. pachystachya leaves present the potential to be used in dermocosmetic formulations to prevent the skin aging process, which attracts the attention of pharmaceutical companies and researchers interested in the development of novel ingredients likely to be used as active principles in antiaging products.

Bioactive derivatives from oleuropein by a biotransformation on Olea europaea leaf extracts

2002 ◽  
Vol 93 (2) ◽  
pp. 109-119 ◽  
Author(s):  
Raffaella Briante ◽  
Francesco La Cara ◽  
Ferdinando Febbraio ◽  
Maurizio Patumi ◽  
Roberto Nucci
Keyword(s):  
Olea Europaea ◽  
Leaf Extracts ◽  
Olea Europaéa

scholarly journals Lipid Peroxidation and Antioxidant Activities of the Aqueous Rhizome Extract of Rheum officinale Baillon

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Eugene Chang ◽  
Choon Young Kim
Keyword(s):  
Lipid Oxidation ◽  
Antioxidant Activities ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Thiobarbituric Acid ◽  
Natural Antioxidant ◽  
Total Phenolic ◽  
Ros Generation ◽  
Thiobarbituric Acid Reactive Substance ◽  
Superoxide Anion Production

Generation of reactive oxygen species (ROS) is associated with dysregulation of antioxidant defense mechanisms and incidence of human diseases. The specific aim of this study was to investigate the lipid oxidation and antioxidant activity of aqueous extract of Rheum officinale Baillon rhizome in order to evaluate its potential as a future novel natural antioxidant resource and a functional ingredient in food and pharmaceutical formations. Total phenolic and flavonoid contents of Rheum rhizome extract were dose dependently increased. Consistent with this, radical scavenging activities of Rheum rhizome extract as determined by 2,2-diphenyl-1-picrylhydrazyl assay and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) radical scavenging activity were significantly elevated as the concentration increased. In addition, the treatment of aqueous Rheum rhizome extract significantly increased ferric reducing and copper chelating activities. According to results of thiobarbituric acid reactive substance analysis, Rheum rhizome extract significantly delayed lipid oxidation. Preincubation with Rheum rhizome extract significantly inhibited tert-butyl hydroperoxide- (t-BHP-) induced ROS generation. Moreover, superoxide anion production was significantly lower in Rheum rhizome extract-treated RAW264.7 macrophage cells than t-BHP-incubated cells (p<0.05). These findings suggest that Rheum officinale Baillon rhizome extract has a potential as an excellent natural antioxidant agent.

Influence of drying temperature and harvesting season on phenolic content and antioxidant activity of olive ( Olea europaea ) leaf extracts

2017 ◽  
Vol 108 ◽  
pp. S91
Author(s):  
María Losada-Echeberría ◽  
Amani Taamalli ◽  
Vicente Micol ◽  
María Herranz-López ◽  
David Arráez-Román ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Olea Europaea ◽  
Phenolic Content ◽  
Leaf Extracts ◽  
Drying Temperature ◽  
Olea Europaéa
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