Protein-rich nutrient supplements and animal feed supplements derived from an anaerobic bacterial process are generated through a myriad of cell rupturing and protein fractionation/purification processes. Bacterial fermentation systems and methods of obtaining one or more protein-containing portions from a fermentation process using carbon monoxide-containing gaseous substrates are provided. The invention further provides compositions of protein-rich nutrient supplements with useful applications for intake by a variety of different animals and humans.通過細胞破裂和蛋白質分餾/純化過程產生的來源於厭氧細菌過程的富含蛋白質的營養補充劑和動物飼料補充劑。本發明提供了使用含一氧化碳氣態底物從發酵過程中獲得一個或多個含蛋白質部分的細菌發酵系統和方法。本發明還提供富含蛋白質的營養補充劑的組合物,其可用於人類和各種不同種類動物的攝取。