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| Evaluation of fruit quality and characters of five leading olive varieties from Wudu district of Gansu province |
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| KeyWord:Gansu Wudu olive fruit quality biological characteristics active component |
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| Abstract: |
| The fruit characters and comprehensive quality of five leading olive varieties (Frantoio, Ezhi 8, Leccino, Coratina and Picholine)cultivated in Dongjiaba plantation of Wudu district of Gansu province were investigated based on the biological characteristics and active ingredients of olive fruit. The results showed that the single fruit mass, fruit flesh content, moisture content and fruit shape index were 2.56-6.16 g, 73.61%-88.53%, 51.84%-68.50% and 1.27-1.44 respectively. And the biological characteristics of the tested fruit had significant differences. The contents of oils and total carbohydrates in the olive pulp were 56.17%-71.11% and 4.20%-8.83% respectively, and the two parameters had certain negative correlation. The contents of total polyphenol, total flavonoids and saponins in water extracts of olive pulp were 0.49%-0.56%, 313%-7.14% and 1.05%-2.26%, respectively. The three active ingredients contents had significant differences among tested olive varieties. The polyphenol oxidase (PPO)activity in olive pulp was 23.89-325.00 U/(g·min), and PPO activity had certain negative correlation with total polyphenol and total flavonoids, which indicated that PPO possibly participated in the oxidation of phenolic components in olive fruit. Comprehensive evaluation suggested that the fruit of the five leading olive varieties had the characteristics of excellent oil cultival. |
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