1. A covalently cross-linked protein nanoparticle with a size of 10-999 nm or preferably 50-200 nm, suitable for biotechnological, cosmetic, pharmaceutical and biomedical applications, characterized in that said nanoparticle, which consists of one or more types of protein, one or more types of adsorbates and of at least one type of interprotein crosslinking of zero or greater length, is a product of nanofragmentation of a compositionally equivalent or almost equivalent precursor material having a minimum length in any dimension is one micron. 2. The crosslinked protein nanoparticle of claim 1, wherein the protein component consists of one or more types of enzyme, hormone, receptor, structural, transport, or antibody class proteins. The cross-linked protein nanoparticle according to claim 1 or 2, wherein the protein component consists of one or more hydrolases, prohydrolases, isomerases, transferases, oxidoreductases, lyases, ligases, insulin, glucagon, glucagon-like peptide, extendin, derivatives of extendin, simlin, somatokin, antibodies to insulin, antibodies to proinsulin, interferon, anti-cancer monoclonal antibodies, anti-cancer vaccines, natrecor, antiplatelet agents, cytokines, tumor necrosis factor alpha, interleukin 1 receptor antagonist, HIV-1 inhibitor T20 peptide, lawsuit natural protein 5H-ex, somatostatin, a fusion inhibitor of HIV T-1249, antibacterial proteins, lysozyme, lactoferrin, bacteriocin, interleukin-2, angiotensinogen, angiotensin, an angiotensin converting enzyme inhibitor, gelatin, collagen, procollagen, chitosan protein, chitosan, myosin, actin, hormone1. Ковалентносшитая белковая наночастица размером 10-999 нм или предпочтительно 50-200 нм, подходящая для биотехнологических, косметических, фармацевтических и биомедицинских применений, характеризующаяся тем, что указанная наночастица, которая состоит из одного или более типов белка, одного или более типов адсорбатов и, по крайней мере, одного типа межбелковой сшивки нулевой или большей дл
