Anthracnose disease caused by Colletotrichum spp. makes heavy losses for post-harvest mangoes of Cat Hoa Loc variety during storage, packaging, and transportation. The synthetic fungicides are commonly used to control the disease, but they are not safe for consumers’ health and environment. This study was aimed to investigate the use of essential oils (EOs) as the safe alternative control. Pathogen was isolated from the infected Cat Hoa Loc mangoes and identified by morphology and DNA sequencing of the ITS region. Six EOs (cinnamon, basil, lemongrass, peppermint, coriander, and orange) were chemically analyzed by GC–MS. The antifungal activity of EOs was studied in vitro and in vivo. The results showed that the isolated pathogen was Colletotrichum acutatum. Cinnamon, basil, and lemongrass EOs effectively inhibited the growth of C. acutatum in descending order of cinnamon, basil, and lemongrass. However, they (except basil oil) severely damaged fruit peels. The antifungal activity was closely related to the main compounds of EOs. Basil EOs effectively controlled anthracnose development on Cat Hoa Loc mangoes artificially infected with C. acutatum, and its effectiveness was comparable to that of fungicide treatment. Consequently, basil EOs can be used as a biocide to control anthracnose on post-harvest Cat Hoa Loc mangoes.

A huge amount of orange peel waste is annually discharged into the environment. Processing of this waste for the control of post-harvest fruit diseases can reduce environmental pollution. Essential oils (EOs) from fruit peels of Citrus reticulata × sinensis (Sanh cultivar) and Citrus sinensis (Xoan, Mat and Navel cultivar) were investigated for their ability to control anthracnose caused by Colletotrichum gloeosporioides and Colletotrichum scovillei on mangoes. EOs were extracted by hydro-distillation and analyzed by GC-MS and GC-FID. The antifungal activity of the EOs was determined by in vitro and in vivo assays. The Mat cultivar had the highest extraction yield of 3% FW, followed by Xoan (2.9%), Sanh (2.2%), and Navel (1%). The chemical composition of the EOs was similar, with limonene as the main compound (around 96%). The antifungal activity of EOs was not different, with a minimum fungicidal concentration of 16% for both fungi. The disease inhibition of EOs increased with their concentration. The highest inhibition of anthracnose caused by both fungi on mangoes was achieved at 16% EO. EOs had no adverse effect on mango quality (pH, total soluble solids, total acidity, color and brightness of mangoes), except firmness and weight loss at high concentrations (16%). Orange EOs can be used as bio-fungicides to control mango anthracnose at high concentrations.

Nghiên cứu được thực hiện nhằm so sánh hiệu suất thu hồi, hàm lượng polyphenol tổng số (TPC), flavonoid tổng số (TFC) và khả năng chống oxy hóa của cao chiết từ ba giống cam vỏ xanh (cam Sành, Xoàn và Mật) và giống cam Navel bằng phương pháp chiết ngâm dầm và Soxhlet. Khả năng chống oxy hóa được xác định bằng thử nghiệm DPPH, ABTS, FRAP và RP. Kết quả, hiệu suất thu hồi cao chiết bằng Soxhlet cao hơn ngâm dầm ở bốn giống cam. Cao chiết cam Sành bằng Soxhlet có hiệu suất cao nhất (15,1%) theo sau là cao chiết cam Xoàn (11,1%). Tuy nhiên, TPC và TFC của cao chiết bằng Soxhlet thấp hơn ngâm dầm, lần lượt là 25,8 – 46,7 mg GAE/g và 16,5 – 30,5 mg QE/g. Cao chiết ngâm dầm có khả năng chống oxy hóa ở các thử nghiệm cao hơn Soxhlet. Cao chiết cam Xoàn bằng ngâm dầm và Soxhlet có hàm lượng TPC và TFC cao nhất nhưng cao chiết ngâm dầm có khả năng chống oxy hóa cao nhất. Tóm lại, Soxhlet có hiệu suất thu hồi cao nhưng khả năng chống oxy hóa thấp hơn ngâm dầm.