3.5. Sun protection factor
The efficacy of a substance or product to absorb ultraviolet radiation is measured by the Sun Protection Factor (SPF). This factor indicates how many times longer a person wearing the sunscreen substance can stay in the sun without getting burned as opposed to not wearing any sun protection.
The highest SPF values were found in C. eugenioides (2.6), C. salvatrix (2.2–3.1) and C. stenophylla (0.9–4.1), and the lowest in C. kapakata (0.0–0.1), C. liberica var. liberica ‘Passipagore’ (0.3), C. liberica var. dewevrei Abeokutae (0.2–0.6) and C. canephora (0.2–0.6).
About 70% of all the coffee grown in the world is C. arabica. The high SPF of C. arabica shown in Table 5, makes it the species of choice for applications in cosmetics. On the other hand, the probability of using the C. canephora species for this same purpose is remote since the SPF calculated for this species (0.35) is much lower than that of C. arabica SPF (1.50).
3.5. Sun protection factorThe efficacy of a substance or product to absorb ultraviolet radiation is measured by the Sun Protection Factor (SPF). This factor indicates how many times longer a person wearing the sunscreen substance can stay in the sun without getting burned as opposed to not wearing any sun protection.The highest SPF values were found in C. eugenioides (2.6), C. salvatrix (2.2–3.1) and C. stenophylla (0.9–4.1), and the lowest in C. kapakata (0.0–0.1), C. liberica var. liberica ‘Passipagore’ (0.3), C. liberica var. dewevrei Abeokutae (0.2–0.6) and C. canephora (0.2–0.6).About 70% of all the coffee grown in the world is C. arabica. The high SPF of C. arabica shown in Table 5, makes it the species of choice for applications in cosmetics. On the other hand, the probability of using the C. canephora species for this same purpose is remote since the SPF calculated for this species (0.35) is much lower than that of C. arabica SPF (1.50).
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