A comparative study of the amino acid composition of eleven Portuguese wild mushroom species showed that Boletus edulis has the highest total amino acid content.
-Rich in dietary minerals, sodium, iron, calcium, and magnesium.
-High content of B vitamins and tocopherols
-Appreciable amounts of selenium, a trace mineral
-Carbohydrate component contains monosaccharides glucose mannitol, α-trehalose and polysaccharide glycogen
The exposure to heavy metals is a health risk, as porcini mushrooms belong to the species that can accumulate heavy metals. 100 grams of the spruce boletus can contain between 0.1 and 0.2 milligrams of cadmium and 0.08 to 0.5 milligrams of lead. It can tolerate the pollutants because it forms phytochelatins that bind them and thus detoxify them.
In rare cases, the spruce boletus can cause allergic reactions by inhalation, ingestion, or contact, which are caused by the antibody immunoglobulin, this is triggered by a protein that is stable in digestion. In extremely rare extreme cases, consumption of the porcini may cause life-threatening reactions.
Water-insoluble structural polysaccharide chitin (up to 80-90% of dry matter in mushroom cell walls). Chitin, hemicellulose, and pectin-like carbohydrates-all indigestible by humans-contribute to high proportion of insoluble fiber in B. edulis.
In animal studies, the porcini mushroom was shown to induce the life-threatening poisoning syndrome of rhabdomyolysis when consumed in large quantities over several consecutive days. The study also showed this for other edible mushrooms such as birch red cap (Leccinum versipelle). An occurrence of rhabdomyolysis in one individual due to multiple consumption of a mixed mushroom dish of red caps and porcini has been reported from Poland. Repeated consumption of larger quantities of porcini mushrooms in quick succession should therefore be avoided.
Boletus edulis s is a very good carrier of protein; it is very similar to the best animal proteins and is particularly easy to digest. In addition, it is rich in free amino acids[.
The fatty acids it contains are largely (84.5%) unsaturated, of which about half are polyunsaturated. These include linoleic acid (42.2 percent of all fatty acids) and linolenic acid (0.2 percent), which are the most abundant. Among the monounsaturated fatty acids contained is oleic acid (36.1 percent of all fatty acids); saturated fatty acids include palmitic (9.8 percent) and stearic (2.7 percent) acids.
100 grams of the meat contain an average of almost 500 milligrams of ergosterol, mainly in cap and hymenophore, and almost 30 milligrams of ergosterol peroxide. The latter has anti-inflammatory and antiviral effects, among others.
Boletus edulis also accumulates heavy metals. In addition to toxic substances such as cadmium and lead (see the Health Aspects section), silver (0.02-0.3%, based on dry weight and sites uncontaminated by heavy metals) and gold (<0.002%), among others, were detected in the flesh of the fruit bodies