ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

The alleviation of sap-induced mango skin injury by calcium hydroxide.

O'Hare, T. J.; Prasad, A.;

Acta Horticulturae Year: 1992 Issue: No. 321 Pages: 372-381 Ref: 9 ref.

1992

บทคัดย่อ

Sapburn, mango fruit skin injury caused by exuding sap, occurs to a serious extent in cv. Kensington, which comprises 90% of Australian mango production. The sap obtained from fruits harvested with their stems attached was separated into 2 fractions, an oil (alkenyl resorcinol) and a protein-polysaccharide fraction. The oil fraction was shown to be responsible for the injury which occurred when the sap made contact with the skin and entered the fruit through the lenticels. Injury could be largely eliminated by removing the stems and allowing the fruits to desap while immersed in a solution of 1% w/v calcium hydroxide (pH 12.5). A lime solution (pH also 12.5) was only slightly less effective. Oil droplets exuded during desapping tended to disperse (emulsify) under alkaline conditions, whereas they remained in distinct droplets in water (pH 7.8) or CaCl2 solution (pH 7.3). It is suggested that bonding may occur between the ionized fraction of the sap and divalent Ca ions to form a membrane-like polymer on the surface of the solution.