ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Transmission of UV-irradiance into nectarine fruit.

Blanke, M. M.

Angewandte Botanik Year: 1996 Vol: 70 Issue: 1/2 Pages: 76-77 Ref: 13 ref.

1996

บทคัดย่อ

With the global depletion of the ozone layer, leaves and fruits are increasingly exposed to UV irradiance on the tree. Some fruits are additionally exposed postharvest to artificial UV irradiance, leading to a cumulative effect. This study examined the transmission of UV light (200-400 nm) by the peel of ripe nectarines using UV/VIS spectrophotometry to aid understanding of UV effects and assess the sensitivity of the peel to UV wavelengths. Yellow peel of nectarines transmitted <0.1% in the UV-C range of 220-280 nm. With longer wavelengths, UV-light transmission increased slowly from 0.4% at 284 nm to 1.6% at 320 nm and, in the UV-A region, progressively from 1.9% at 330 nm to a maximum of 13% of incident irradiance at 400 nm. Red peel of nectarines transmitted <0.1% of UV-C and UV-B light, but up to 0.9% of incident UV-A light at 400 nm. Conversely, UV absorption of nectarine peel decreased with longer wavelengths. Hence, fruit parenchyma is more affected by UV irradiance at wavelengths above

approx equal to 280 nm and beneath yellow than beneath red peel.