Scald development and the levels of alpha-farnesene and conjugated triene hydroperoxides in apple peel after treatment with sucrose ester-based coatings in combination with food-approved antioxidants
A. D. Bauchot and P. John
Postharvest Biology and Technology Vol: 7 Issue: 1-2 Pages 41-49.
1996
บทคัดย่อ
Ascorbyl palmitate and n-propyl gallate were applied either
separately or together to `Granny Smith' apples (Malus domestica Borkh.)
as a possible treatment to control scald development. The antioxidants were
applied as formulations with Semperfresh (a sucrose ester-based fruit coating).
Their effect on scald development and also on -farnesene
and conjugated triene hydroperoxide (CTH) levels was compared to that of
diphenylamine (DPA). After four months storage at 0°C and ten
days at 20°C, untreated apples were affected on 10-25% of
their surface area. Apples treated with ascorbyl palmitate plus Semperfresh
delayed scald development during the assessment at room temperature, while DPA
provided almost complete control. After six months at 0°C and then
ten days at room temperature, DPA-treated apples were only slightly scalded,
whereas all the other apples were severely scalded. After four months storage,
the beneficial effect of DPA treatment was accompanied by a slightly higher
-farnesene
level than that of the control, and by CTH levels one third to one half than
those of the control. Compared to the DPA treatment, coating with ascorbyl
palmitate plus Semperfresh led to similar levels of CTH, but the
-farnesene
level was much lower. It is concluded that the limited scald control obtained
with Semperfresh plus ascorbyl palmitate, unlike the greater control seen with
DPA, is not due to an inhibition of
-farnesene
oxidation to CTH.