en تخصصي Special Original article Original article <div style="text-align: justify;"><span style="font-family:Times New Roman;"><span style="font-size:14px;"><span style="line-height:115%"><span style="color:black"><b><span style="line-height:115%"><span style="color:black">Background:</span></span></b> <span style="line-height:115%">Lichen is a symbiotic organism with unique structure composed of a fungal partner and an algal partner. It has been utilized in folk foods and medicines. <span style="color:black">The objective of the present study was to analyze the ingredients and the impact of heating on various physicochemical and phytochemical characteristics of a 500 g sample of lichen <i>Evernia prunastri </i>from<i> </i>Jijel, Algeria<i> </i>collected in May 2021. </span></span></span></span><br> <span style="line-height:115%"><span style="color:black"><b><span style="line-height:115%"><span style="color:black">Methods:</span></span></b><span style="line-height:115%"><span style="color:black"> The nutritional value of the lichen was determined by studying various parameters. The metal contents were analyzed using an Atomic Absorption Spectrophotometer. The effect of heating (70 and 100 &deg;C) on the physicochemical parameters, and bioactive compounds of aqueous extracts obtained by maceration in distilled water was studied. Statistical analysis was performed using ANOVA. </span></span></span></span><br> <span style="line-height:115%"><span style="color:black"><b><span style="line-height:115%"><span style="color:black"><span style="letter-spacing:-.1pt">Results: </span></span></span></b><span style="line-height:115%"><span style="color:black"><span style="letter-spacing:-.1pt">A high percentage of carbohydrates (64.00%) were observed in the lichen material. Pectin, fats, and crude proteins levels were low. High ash content (10.85%) was obtained with the presence of metal elements. Preliminary phytochemical analysis indicated the presence of polyphenols and flavonoids with 51.13 mg Gallic Acid Equivalent (GAE)/100 g and 17.87 mg Quercetin Equivalent (QE)/100 g of lichen, respectively. The lichen sample subjected to 70 &deg;C demonstrated an increase in the parameters examined, with the exception of proteins and vitamin C. Conversely, the lichen sample treated at 100 &deg;C exhibited a reduction in vitamin C, protein, and bioactive compound content, as well as an increase in sugar content. Titratable acidity and pH parameters were unaffected.</span></span></span></span></span><br> <span style="line-height:110%"><span style="unicode-bidi:embed"><b><span style="line-height:110%"><span style="color:black">Conclusion: </span></span></b><span style="line-height:110%"><span style="color:black">The appreciable quantities of carbohydrates, crude fibers, and other compounds in this lichen suggest a potential use for these active ingredients in the preparation of functional food. Heating to 70 &deg;C produces a preparation enriched in bioactive substances and sugars. However, heating to 100 &deg;C, exposes the various tissues to degradation, potentially leading to a decrease in nutrients.</span></span></span></span><br> <br> <span style="unicode-bidi:embed"><span style="line-height:115%"><b><span style="line-height:115%">DOI:</span></b><span style="color:#000000;"><span style="line-height:115%"> 10.18502/jfqhc.11.2.15650</span></span></span></span></span></span></div> Algeria, Heating, Lichens, Nutritive Value 116 126 http://jfqhc.ssu.ac.ir/browse.php?a_code=A-10-1655-1&slc_lang=en&sid=1 F. Bekka-Hadji fahima.bekka@univ-jijel.dz 0009-0007-7235-5125 Yes Département de Microbiologie Appliquée et Sciences Alimentaires, Faculté des Sciences de la Nature et de la Vie, Université de Jijel, Jijel 18000, Algeria, Laboratoire d’Ecologie Microbienne, Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, Bejaia 06000, Algeria