Variations of Acidity in the Peel of Acid Citrus. I. Acid Contents in the Flavedo and Albedo of Acid Citrus

Widodo, Soesiladi E.; Shiraishi, Masayuki; Shiraishi, Shinya

doi:10.5109/24111

Cited by 1 publication

(1 citation statement)

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“…A similar mechanism is likely to be associated with the behaviour of the ECs F6/ SB and F10/SB applied to control GM and BM in citrus fruit. The pH of the albedo tissue of the citrus fruit rind, the site initially colonized by pathogenic Penicillium spp., is between 5 and 6, and is influenced by fruit maturity (Widodo et al, 1996;Smilanick et al, 2005). Since the ionization constant of benzoic acid is 4.1, a substantial portion would be protonated and active within wounds of citrus rind.…”

Section: Discussionmentioning

confidence: 99%

Starch-glyceryl monostearate edible coatings formulated with sodium benzoate control postharvest citrus diseases caused by Penicillium digitatum and Penicillium italicum

Soto-Muñoz

Martínez-Blay

Pérez-Gago

et al. 2021

Phytopathol. Mediterr.

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The curative antifungal activity of edible composite coatings (ECs) based on pregelatinized potato starch-glyceryl monostearate (PPS-GMS) formulated with or without sodium benzoate (SB) to control green mould (caused by Penicillium digitatum) and blue mould (P. italicum) was assessed on ‘Orri’ mandarins, ‘Valencia’ oranges and ‘Fino’ lemons. These fruit were artificially inoculated with P. digitatum or P. italicum, treated by immersion in coating emulsions and compared to uncoated control fruit immersed in water and fruit immersed in 2% SB (w/v) aqueous solution. Treated fruit were then stored at either 20°C or commercial low temperature (5°C for mandarins and oranges, 12°C for lemons). Coatings without SB did not exhibit antifungal activity, whereas coatings containing 2% SB reduced incidence and severity of green and blue moulds, in comparison to the controls, on all citrus species and in all storage conditions, without differing from the aplication of 2% SB alone. For example, incidence reduction on ‘Fino’ lemons was from 99 to 0% after 7 d at 20°C, and from 99 to 30% after 2 weeks at 12°C. None of the treatments was phytotoxic. These results indicate that applications of SB as antifungal ingredient of PPS-GMS based ECs is a promising non-polluting alternative to control Penicillium postharvest decay of citrus, and these ECs are effective substitutes for conventional waxes amended with synthetic fungicides.

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Section: Discussionmentioning

confidence: 99%