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ARS Home » Southeast Area » Fort Pierce, Florida » U.S. Horticultural Research Laboratory » Citrus and Other Subtropical Products Research » Research » Publications at this Location » Publication #378148
Research Project: Determination of Flavor and Healthful Benefits of Florida-Grown Fruits and Vegetables and Development of Postharvest Treatments to Optimize Shelf Life an Quality for Their Fresh and Processed Products

Location: Citrus and Other Subtropical Products Research

Title: Effect of HLB on chemical components of essential oil extracted from ‘Ray Ruby’ grapefruit peel

Author
item CRUZ, MARIA - Universidade Estadual De Maringá
item FERRAREZI, RHUANITO - University Of Florida
item Bai, Jinhe

Submitted to: Florida State Horticultural Society Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 9/11/2020
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Huanglongbing (HLB) disease has spread through the major citrus-producing countries worldwide, causing large economic losses in the citrus industry. The disease seriously affect citrus production and fruit quality. This study aimed to evaluate effect of HLB on chemical components of peel oil from ‘Ray Ruby’ grapefruit (Citrus paradise). Fruit samples were collected from six year’s old potted trees. The non-infected (HLB-) trees were grown under screen, and infected trees (HLB+) were in open-air. The flavedo tissue (1-2 mm) were manually taken from fruit by using a sharp stainless steel knife, and the oil was extracted by hydrodistillation. The chemical composition of the oil was analyzed by GC-MS. Limonene predominated the oil with a content of 93.6% and 93.7%, in HLB+ and – samples, respectively. The other abundant compounds were ß-myrcene (1.7 and 2.1%), a-pinene (0.6 and 0.7%), (E)-caryophyllene (0.5 and 0.4%) and decanal (0.4%). A principal component analysis (PCA) was performed to project 30 volatile components onto a 2-components plot. HLB+ and HLB- samples were clearly discriminated with ß-myrcene, a-pinene, a-phellandrene, nootkatone, geranyl and citronellyl acetate largely associated with HLB- samples and ß-ocimene, sabinene, nonanal, '-terpinene, octanal, linalool, neral, carvone, geranial, gemacrene D, (E)-caryophyllene and d-cadinene more closely associated with HLB+ samples. Previous reports showed that HLB+ orange juice contains less C8-C10 aldehyde indicating lower quality in pharmaceutical standard but others did not find consistent difference between the two samples. Our data showed that generally HLB+ upregulated many oil components including aldehydes, indicating HLB stress stimulate the volatile metabolisms.