Use "uncombined" in a sentence

1. Other articles where Carboxyhemoglobin is discussed: carbon monoxide poisoning: …they form a stable compound, Carboxyhemoglobin, that decreases the amount of uncombined hemoglobin available for oxygen transport

2. Cinnamic acids play key roles in the formation of other more complex phenolic compounds. The Cinnamic acids (Figure 1) are rarely present in uncombined forms, occurring primarily as esters of quinic acid, but may also be esterified to malic or tartaric acids, or sugars.