Antioxidant activity, color chromaticity coordinates, and chemical characterization of monofloral honeys from Morocco

Abstract

The bioprospecting of several monofloral Moroccan honeys was carried out. The antiradical activity expressed as mmol Trolox equivalents/kg of honey and evaluated by 2,2-diphenyl-1-picrylhydrazyl assay, ranged from 0.15 for euphorb honey to 1.08 for citrus honey. The antioxidant activity expressed as mmol Fe2+/kg and evaluated by ferric ion reducing antioxidant power assay, ranged from 0.96 for euphorb honey to 4.74 for orange honey. The total phenol content was evaluated by colorimetric assay, while the color attributes were evaluated as transmittance data. Significant Pearson correlation factors were found between total polyphenol amount and antioxidant activity and between color attributes and antioxidant activity. Furthermore the chemical composition of volatile organic compounds was determined. The volatile organic compounds chemical composition of the studied honeys was mainly represented by terpene and benzene derivatives, Maillard reaction products, isoprenoids, and hydrocarbons. The volatiles fingerprint, as well as a targeted high-performance liquid chromatography analysis of the polar components, was used to tentatively confirm the declared botanical origin of the samples studied

Discrimination of Clover and Citrus Honeys from Egypt According to Floral Type Using Easily Assessable Physicochemical Parameters and Discriminant Analysis: An External Validation of the Chemometric Approach

“…Egyptian citrus honeys analyzed were the brightest honeys (had the higher mean L* values compared to the mean values of clover or thyme honeys) ( Table 2 ). The results regarding the L* color parameter were in line with those of Petretto et al [ 15 ] involving Moroccan citrus honeys. Color parameter a* had negative values (green components) for all the analyzed honeys ( Table 2 ).…”

“…There are indicative research studies that have been carried out over the past 40 years, in different parts of the world, focusing on the characterization and authentication of honey using melissopalynological, conventional, or instrumental methods in combination with chemometrics [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ].…”

Physicochemical Properties, Mineral Content, Antioxidant Activities, and Microbiological Quality of Bupleurum spinosum Gouan Honey from the Middle Atlas in Morocco

“…e phenol content of our analyzed samples varies between 85.03 ± 5.78 mg GAE/100 g and 229.54 ± 7.71 mg GAE/100 g from Ribat El-Kheire and Enjil, respectively. ese results are higher than those reported by Bouhlali et al for Moroccan monofloral honeys of carob, Eucalyptus, Harmal, Jujube, Lavender, Orange, Rosemary, and Roseda [42] and by Petretto et al for Moroccan monofloral honeys of Asparagus, Citrus, Carob, Euphorbe, Eucalyptus, Orange, and yme [43]. In addition to phenols, honey contains other compounds that have a very important antioxidant role such as ascorbic acid.…”

Bentonite as a Refining Agent in Waste Cooking Oils Recycling: Flash Point, Density and Color Evaluation

“…The bentonite acts as refining agent by removing pigments (as chlorophyll), residual gums, trace of metals, and some oxidation products through chemical and physical adsorption, absorption and filtration. In addition, bentonitecatalyzed degradation of some components of the oil can take place [36]. A more exhaustive chemical characterization of degummed oil prior and post filtration and a correlation between the quality of the refined oil and the type of bentonite are objects of our current research.…”