"free phenol" is correct and usable in written English.
It is a type of organic compound and can be used in a variety of contexts. For example, "The lab ran a test on the sample to measure its free phenol content."
The reaction was monitored through the concentration of free phenol determined by gas chromatography (GC).
Compounds possessing a free phenol group were particularly active and warrant further development.
All compounds having free phenol groups showed good free radical scavenging activity.
Compounds with free phenol hydroxyl group showed higher activity compared to methylated derivatives (or counterparts), which confirms the importance of phenol hydroxyl functionality in the interaction with gelatinase.
Free phenol hydroxyl group is more favorable than the methylated one, which confirms the important role of the phenol hydroxyl group when inhibitors interact with gelatinase.
Together, these assay results indicate the importance of at least one free phenol group on the aromatic D-ring of this system for differential cytotoxicity.
Hull-less barley had the highest content of total free phenols, flavonoids, PVPP bound phenolics and contained flavan-3-ols, not found in other species.
This suggests the possibility that red wine inhibition of conjugation by PST-P of p-cresol and other phenols could result in a build up of free phenols in the circulation, which may be toxic in several ways [9].
Biliary metabolites consisted mostly of sulfates, some glucuronides, and lower amounts of the free phenols.
Despite the very low concentration of free phenols in bile, metabolites detected in feces were all phenols.
As shown in Figure 5, the free phenols diffused from the discs and prevented bacterial growth on the agar.
