Table 4: Comparison of the DPPH, hydroxyl, and ABTS free radical scavenging abilities of polysaccharides from D.  huoshanense, D.  chrysotoxum, and D.  fimbriatum species.

Dendrobium speciesChemical compoundsDPPH concentration (mg/mL)
0.5%1%2%3%

D. huoshanense and D.  chrysotoxum Polysaccharides (scavenging effects %)45–50AB 8090–95
D.  fimbriatum Polysaccharides (scavenging effects %)1040–50

Dendrobium speciesChemical compoundsHydroxyl concentration (mg/mL)
0.5%1%2%3%

D. huoshanense and D.  chrysotoxum Polysaccharides (scavenging effects %)5060–6580
D.  fimbriatum Polysaccharides (scavenging effects %)55–6070–75

Dendrobium speciesChemical compoundsABTS concentration (mg/mL)
0.5%1%2%3%

D. huoshanense and D.  chrysotoxum Polysaccharides (scavenging effects %)AB 10AB 20AB 25
D.  fimbriatum Polysaccharides (scavenging effects %)AB 70AB 90

Notes: —: no tests and about: AB.
The scavenging hydroxyl free radicals abilities of polysaccharides from D.  huoshanense and D.  chrysotoxum are stronger than D.  fimbriatum, and the scavenging ABTS free radicals abilities of polysaccharides from D.  fimbriatum are stronger than D.  huoshanense and D.  chrysotoxum polysaccharides. Results showed that polysaccharides (scavenging DPPH effects %) from D.  huoshanense and D.  chrysotoxum are higher than hydroxyl and ABTS. And polysaccharides (scavenging ABTS effects %) from D.  fimbriatum are higher than DPPH and hydroxyl free radicals.