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Qiuli OuYang, Xiaofang Duan, Lu Li, Nengguo Tao
Our previous study showed that cinnamaldehyde (CA) significantly inhibited the mycelial growth of Geotrichum citri-aurantii , one of the main postharvest pathogens in citrus fruits. This study investigated the antifungal mechanism of CA against G. citri-aurantii . Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images showed that CA treatment led to clear morphological changes in the cell walls and membranes of G. citri-aurantii . However, the membrane integrity, total lipids and ergosterol contents were not apparently affected by CA treatment...
2019: Frontiers in Microbiology
Bin Jia, Lixing Xu, Wenqiang Guan, Qiong Lin, Charles Brennan, Ruixiang Yan, Hui Zhao
Effect of citronella essential oil (CEO) fumigation on sprout suppression and quality of potato tubers during storage was investigated. Potato tubers were treated under conditions of single-phase (30 μL L-1 , 0-10 d) and dual-phase (30 μL L-1 , 0-10 d; 30 μL L-1 , 35-90 d) fumigation. Changes in germination rate, weight loss, starch, reducing sugar, gibberellins (GA3 ), and α-solanine were measured. The results showed that CEO fumigation could control sprouting and improve the quality of potato tubers during storage compared to the non-treated tubers...
June 30, 2019: Food Chemistry
Krishna D Puri, Gary E Vallad, Qing-Ming Qin, Ryan J Hayes, Krishna V Subbarao
Verticillium wilt of lettuce, caused by the soilborne pathogen Verticillium dahliae, poses a serious threat to the California lettuce industry. Knowledge of disease development and its impact on postharvest marketability would facilitate better management of the affected fields. This study investigated postharvest marketability of 22 lettuce varieties harvested from two Verticillium-infested commercial lettuce fields in Salinas and Watsonville, CA, in 2005 using a randomized complete block design. Periodic sampling to monitor disease in several crisphead varieties in the field demonstrated that root symptoms developed quickly at later stages of heading, followed by the onset of foliar symptoms as the crop reached harvest maturity...
February 11, 2019: Plant Disease
Jianlong Liu, Jie Yang, Haiqi Zhang, Liu Cong, Rui Zhai, Chengquan Yang, Zhigang Wang, Fengwang Ma, Lingfei Xu
Understanding ripening and senescence processes in postharvest stored fruit is key to the identification and implementation of effective treatment methods. Here, we explored the effects of exogenous applications of melatonin (MT) and nitric oxide (NO) on ripening and softening processes in three cultivars of European pear ( Pyrus communis L.). The results showed that MT and NO played important roles in the two processes: they decreased the rate of upregulation of PcCel and PcPG, inhibited expression of ethylene synthetase genes ( PcACS and PcACO), and reduced rates of respiration and ethylene production...
February 8, 2019: Journal of Agricultural and Food Chemistry
Wenqing Jiang, Xiaochu Chen, Fengmao Liu, Canping Pan
The residue distribution and dissipation of pyrimethanil, fludioxonil, cyprodinil and kresoxim-methyl which were introduced during postharvest waxing treatments of apples were investigated. In addition, different residue removal methods were tested for the four fungicides in apples and the removal efficiencies were compared. A multi-residue analytical method was developed based on quick, easy, cheap, effective, rugged, and safe method (QuEChERS) method for the determination of the fungicide residues in apples...
February 8, 2019: Journal of Agricultural and Food Chemistry
Niyati Patel, Saikat Gantait, Jitendriya Panigrahi
To extend the postharvest shelf-life of green bell pepper (Capsicum annuum L.), an exogenous application of two polyamines, Spermidine and Putrescine (SPD-PUT), was tested in multiple combinations (10 μM plus 10 μM, 20 μM plus 20 μM, and 30 μM plus 30 μM) at 4 ± 1 °C for 40 days. The titratable acidity, protein content, activities of catalase and peroxidase, chlorophyll and capsaicin content gradually decreased for all the treated and untreated fruits throughout the storage period...
March 1, 2019: Food Chemistry
Mekhala D K Vithana, Zora Singh, Stuart K Johnson
There is a demand for feasible methodologies that can increase/ maintain the levels of health-promoting phytochemicals in horticultural produce, due to strong evidence that these compounds can reduce risk of chronic diseases. Mango (Mangifera indica L.), ranks fifth among the most cultivated fruit crops in the world, is naturally rich in phytochemicals such as lupeol, mangiferin and phenolic acids (eg. gallic acid, chlorogenic acid and vanillic acid). Yet, there is still much scope for up-regulating the levels of these compounds in mango fruit through manipulation of different pre- and postharvest practices that affect their biosynthesis and degradation...
February 5, 2019: Journal of the Science of Food and Agriculture
Zhengjun Shi, Haiyan Yang, Junying Jiao, Fang Wang, Yanyuan Lu, Jia Deng
This study was to evaluate the effect of graft copolymer (CTS-g-SA) of chitosan (CTS) and salicylic acid (SA) on the storability of grapefruit fruits during postharvest storage. Results indicate that the graft copolymer treatment significantly depressed green mold caused by Penicillium digitatum. The graft copolymer application kept fruit firmness without impairing the fruit quality. Moreover, the graft copolymer treatment inhibited the activity and gene expression of cell wall-modifying enzymes such as polygalacturonase, cellulase, pectin methylesterase, α-l-arabinofuranosidase, β-galactosidase, and suppressed the modification of cell wall components including covalently bound polysaccharide (sodium carbonate soluble pectin, 24% KOH-soluble fraction), which were associated with fruit softening...
June 15, 2019: Food Chemistry
Santosh Kumar Bose, Prianka Howlader, Xiaochen Jia, Wenxia Wang, Heng Yin
Abscisic acid (ABA) has been advocated to play substantial role on ripening of non-climacteric fruit. Here we report that alginate oligosaccharide (AOS) postharvest treatments delayed the accumulation of ABA and ABA-conjugates and restrained the expression of ABA signaling genes, resulting enlarged storage life of strawberry. In addition, AOS postharvest treatments also increased the quality and reduced the degradation of cell wall components and repressed the expression of cell wall degradation genes. AOS treated fruits exhibited significant delays of hardness, decay percentage, titratable acidity, pH, total soluble solids and vitamin C content compared to untreated fruits...
June 15, 2019: Food Chemistry
Martina Loi, Vania C Liuzzi, Francesca Fanelli, Silvana De Leonardis, Teresa Maria Creanza, Nicola Ancona, Costantino Paciolla, Giuseppina Mulè
Broccoli (Brassica oleracea L. var. italica) is largely cultivated in southern Italy. It is an important source of phytonutrients, which are partially lost during postharvest storage. The aim of this work was to evaluate the overall effect of five different low-intensity light-emitting diodes (LEDs) on the quality parameters of broccoli florets over 20 d of cold storage. The level of ascorbic acid, chlorophylls, carotenoids, phenolic compounds and soluble proteins, as well as colour analysis, were evaluated...
June 15, 2019: Food Chemistry
Xiumin Fu, Sihua Cheng, Chao Feng, Ming Kang, Bingzhi Huang, Yueming Jiang, Xuewu Duan, Don Grierson, Ziyin Yang
Bananas are a recommended food source to alleviate vitamin A deficiency because they contain a high ratio of provitamin A precursors. The objective of this study was to investigate carotenoid accumulation pattern in banana fruits during postharvest ripening and the mechanisms regulating this process. Ripe banana pulp had an unusually high α-/β-carotene ratio (1.05), and the carotenoid contents increased (p ≤ 0.05) under light and high temperature. We analyzed the sequences, transcript levels, and functions of genes involved in carotenoid synthesis...
June 15, 2019: Food Chemistry
L L Dunn, M L Harness, D M Smith, S J Gorman, Q Zhong, P M Davidson, F J Critzer
Alternative postharvest sanitizers to chlorine are of increasing interest for many organic growers and consumers. An emulsion of clove bud oil (CBO; 0.2 and 0.5%) or thyme oil (0.2 and 0.5%) was evaluated as a sanitizer for produce washing against a five-serovar cocktail of Salmonella on snacking peppers and compared for antimicrobial efficacy with sodium hypochlorite (200 ppm). To further evaluate these compounds, the sanitation efficacy of an emulsion was examined after the addition of 1% organic load (OL)...
January 2019: Journal of Food Protection
Erika S Varady, Sohrab Bodaghi, Georgios Vidalakis, Greg W Douhan
Penicillium digitatum is one of the most important postharvest pathogens of citrus on a global scale causing significant annual losses due to fruit rot. However, little is known about the diversity of P. digitatum populations. The genome of P. digitatum has been sequenced, providing an opportunity to determine the microsatellite distribution within P. digitatum to develop markers that could be valuable tools for studying the population biology of this pathogen. In the analyses, a total of 3,134 microsatellite loci were detected; 66...
January 30, 2019: MicrobiologyOpen
Chuying Chen, Zhengpeng Nie, Chunpeng Wan, Jinyin Chen
Xinyu tangerine is a citrus fruit that has enjoyed great popularity in China for its fewer dregs and abundant nutrients. However, it is considered an easily perishable fruit that is vulnerable to various pathogenic fungal infections, especially by Penicillium italicum , which reduces its storage life and commercial value. Normally, to reduce the losses caused by fungal deterioration of harvested fruit, polysaccharide-based edible coating, containing natural antimicrobial agents (e.g. plant extracts), have been applied...
January 28, 2019: Biomolecules
Simone Klein, Antje Fiebig, Daniel Neuwald, Dominik Dluhosch, Lena Müller, Georg Groth, Georg Noga, Mauricio Hunsche
BACKGROUND: Processes extending shelf-life of climacteric fruit play an important role in terms of a sustainable global food supply. In a previous study, a synthetic octapeptide (NOP-1) was shown to inhibit the interaction between ETR (ethylene receptor) and EIN2 (ethylene insensitive-2), and in consequence delay tomato ripening. We investigated for the first time the effect of NOP-1 to inhibit the ripening of apples (Golden Delicious) during postharvest. RESULTS: Using purified recombinant proteins from a bacterial expression system, we demonstrate here that EIN2 also interacts tightly (Kd = 136 +/- 29 nM) with the corresponding apple ethylene receptor MdETR1...
January 29, 2019: Journal of the Science of Food and Agriculture
Chuying Chen, Wenwen Qi, Xuan Peng, Jinyin Chen, Chunpeng Wan
7-demethoxytylophorine (DEM) is a phenanthroindolizidine alkaloid, which is reported to be effective in inhibiting leucocytes and regulation of human immunity. However, few studies reported the inhibitory effect of DEM against plant-pathogenic fungi, particularly postharvest pathogen Penicillium italicum ( P. italicum ). Current studies have investigated the antifungal activity of DEM through membrane damage and energy deficit in P. italicum . The results showed that the DEM potentially inhibits the growth of P...
January 26, 2019: Microorganisms
Christelle Abou Nader, Jean-Michel Tualle, Eric Tinet, Dominique Ettori
The monitoring and characterization of agricultural products before harvest or during ripening, storage, and shelf life has recently been increasingly explored in the literature. The analysis of biospeckle activity has potential for the determination of the optimal harvest window, the monitoring of the fruit ripening process, and the detection of diseases and bruising. In this technique, the specimen is illuminated with coherent light and speckle intensity fluctuations are analyzed using diverse methodologies...
January 25, 2019: Sensors
Francisco Palma, Fátima Carvajal, Raquel Jiménez-Muñoz, Amada Pulido, Manuel Jamilena, Dolores Garrido
This work examines the effect of a treatment with 1 mM of γ-aminobutyric acid (GABA) on zucchini fruit during postharvest cold storage. Specifically, the effect of GABA on postharvest quality was measured, as well as its implication in the GABA shunt and other related metabolic pathways. The treatments were performed in Sinatra, a variety of zucchini highly sensitive to low-temperature storage. The application of GABA improved the quality of zucchini fruit stored at 4 °C, with a reduction of chilling-injury index, weight loss, and cell death, as well as a lower rate of electrolyte leakage...
January 22, 2019: Plant Physiology and Biochemistry: PPB
Martin Charles Likongwe, William Kasapila, Mangani Katundu, Placid Mpeketula
Microbiological quality of smoked catfish ( Clarias gariepinus ) locally known as Mlamba was assessed in this study where traditional and improved smoking kilns were used to smoke fish. Catfish is common fish caught in abundance in the Lake Chilwa basin, and the fish is usually smoked to reduce postharvest losses and increase shelf life. Samples were collected in sterile polythene bags, well labeled, and collected in cooler boxes transported ready for laboratory analysis. One gram representative sample was obtained aseptically from the muscle of the fresh and smoked catfish (Mlamba) samples...
January 2019: Food Science & Nutrition
Seyed F Hosseini, Milad Amraie, Mohammad Salehi, Maedeh Mohseni, Hajer Aloui
The present study assessed the ability of chitosan-based coatings incorporating savory and/or tarragon essential oils (EOs) to preserve the postharvest quality of kumquats. Changes in weight loss, titratable acidity, total soluble solids, and vitamin C content were determined over 30 days of storage at 7°C. Savory ( Satureja hortensias L.) essential oil was characterized by thymol (29.1%), carvacrol (26.6%), and γ-terpinene (24.72%) as major constituents. While, in the tarragon ( Artemisia dracunculus L...
January 2019: Food Science & Nutrition
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