ABSTRACT

The term “single-cell proteins” (SCP) refers to the dried cells of microorganisms such as algae, actinomycetes, bacteria, yeasts, molds, and higher fungi grown in large-scale culture systems for use as protein sources in human foods or animal feeds. Cellulose produced in this way has not yet been used as a substrate for SCP production. In most SCP processes, the carbon substrate is present in relatively low concentrations, either because of its solubility or because the amount that can be tolerated by a given microorganism is limited. The phosphorus source for SCP production is usually supplied as either phosphoric acid or soluble phosphates; a food- or feed-grade source of phosphorus, which is low in arsenic, fluoride, or heavy metals, should be used. Estimates of energy requirements for SCP processes vary widely. In human foods, flavor and texture, in addition to nutritional value of SCP products, are important determinants of acceptability.