Characterization of the Phytochemical Constituents of Taif Rose and Its Antioxidant and Anticancer Activities

Table 1

DPPH free radical scavenging activity, total antioxidant capacity, and reducing power activity of 80% methanol extracts, 𝑛-butanol, and aqueous fractions for both fresh and dry Taif rose.

Extract	DPPH free radical scavenging activity		Total antioxidant capacity; (mg equivalent to ascorbic acid/g extract)^3	Reducing power activity (mg equivalent to ascorbic acid/g extract)^4
	SC50 (μg/mL)^1	(mg ascorbic acid equivalent/g extract)^2
Fresh roses
80% MeOH	12.18±0.07^c	478.59±2.79^a	357.41±6.58^b	248.46±2.70^b
𝑛-Butanol fraction	5.86±0.07^a	994.53±11.90^c	542.45±9.56^d	432.17±2.13^e
Aqueous fraction	>100^d	—	166.03±15.36^a	100.54±2.57^a
Dry roses
80% MeOH	12.24±0.1^c	476.21±3.77^a	354.87±17.96^b	278.80±13.88^c
𝑛-Butanol fraction	7.19±0.08^b	810.96±9.52^b	504.43±22.92^c	396.72±6.13^d
Aqueous fraction	>100^d	—	157.16±5.8^a	94.06±1.77^a
Ascorbic acid	5.83±0.24^a	—	—	—

Values of SC₅₀, total antioxidant capacity reducing power activity, were expressed as mean of triplicate determinations ± standard deviation (𝑛=3). Values in the same column followed by a different letter (a–e) are significantly different (𝑃<0.05, ANOVA).
¹SC₅₀: concentration in 𝜇g/mL required scavenging the DPPH radical (100 𝜇g/mL) by 50%. SC₅₀ was calculated by probit-graphic interpolation for six concentration levels.
²Radical scavenging activity expressed by mg ascorbic acid equivalent/g extract.
³Antioxidant capacity monitored by the phosphomolybdenum method expressed by mg ascorbic acid equivalent/g extract.
⁴Reducing power activity expressed by mg ascorbic acid equivalent/g extract.