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1.
J Agric Food Chem ; 72(20): 11629-11639, 2024 May 22.
Article in English | MEDLINE | ID: mdl-38739462

ABSTRACT

Blueberries (Vaccinium section Cyanococcus) have a wealth of bioactive compounds, including anthocyanins and other antioxidants, that offer significant health benefits. Preserving these compounds and maintaining the sensory and nutritional qualities of blueberry products such as juice during cold market storage is critical to meet consumer expectations for nutritious, safe, and minimally processed food. In this study, we compared the effects of two preservation processing techniques, high-temperature short-time (HTST) and continuous flow high-pressure homogenization (CFHPH), on blueberry juice quality during storage at 4 °C. Our findings revealed that inlet temperature (Tin) of CFHPH processing at 4 °C favored anthocyanin retention, whereas Tin at 22 °C favored ascorbic acid retention. After 45 days of storage, CFHPH (300 MPa, 1.5 L/min, 4 °C) juice retained up to 54% more anthocyanins compared to control at 0 day. In contrast, HTST treatment (95 °C, 15 s) initially increased anthocyanin concentrations but led to their subsequent degradation over time, while also significantly degrading ascorbic acid. Furthermore, CFHPH (300 MPa, 4 °C) juice had significantly lower polyphenol oxidase activity (>80% less than control), contributing to the overall quality of the juice. This innovative processing technique has the potential to improve commercial blueberry juice, and help meet the rising demand for healthy and appealing food choices.


Subject(s)
Anthocyanins , Ascorbic Acid , Blueberry Plants , Cold Temperature , Food Storage , Fruit and Vegetable Juices , Fruit , Anthocyanins/chemistry , Anthocyanins/analysis , Blueberry Plants/chemistry , Ascorbic Acid/analysis , Ascorbic Acid/chemistry , Fruit and Vegetable Juices/analysis , Fruit/chemistry , Pressure , Food Preservation/methods , Food Preservation/instrumentation , Food Handling/methods , Food Handling/instrumentation , Antioxidants/chemistry , Antioxidants/analysis
2.
PLoS One ; 19(4): e0293861, 2024.
Article in English | MEDLINE | ID: mdl-38603714

ABSTRACT

The goal of this study was to characterize the bacterial diversity on different melon varieties grown in different regions of the US, and determine the influence that region, rind netting, and variety of melon has on the composition of the melon microbiome. Assessing the bacterial diversity of the microbiome on the melon rind can identify antagonistic and protagonistic bacteria for foodborne pathogens and spoilage organisms to improve melon safety, prolong shelf-life, and/or improve overall plant health. Bacterial community composition of melons (n = 603) grown in seven locations over a four-year period were used for 16S rRNA gene amplicon sequencing and analysis to identify bacterial diversity and constituents. Statistically significant differences in alpha diversity based on the rind netting and growing region (p < 0.01) were found among the melon samples. Principal Coordinate Analysis based on the Bray-Curtis dissimilarity distance matrix found that the melon bacterial communities clustered more by region rather than melon variety (R2 value: 0.09 & R2 value: 0.02 respectively). Taxonomic profiling among the growing regions found Enterobacteriaceae, Bacillaceae, Microbacteriaceae, and Pseudomonadaceae present on the different melon rinds at an abundance of ≥ 0.1%, but no specific core microbiome was found for netted melons. However, a core of Pseudomonadaceae, Bacillaceae, and Exiguobacteraceae were found for non-netted melons. The results of this study indicate that bacterial diversity is driven more by the region that the melons were grown in compared to rind netting or melon type. Establishing the foundation for regional differences could improve melon safety, shelf-life, and quality as well as the consumers' health.


Subject(s)
Bacillaceae , Cucumis melo , Cucurbitaceae , United States , Cucurbitaceae/microbiology , Cucumis melo/microbiology , RNA, Ribosomal, 16S/genetics , Bacteria/genetics , Enterobacteriaceae
4.
PeerJ ; 11: e14932, 2023.
Article in English | MEDLINE | ID: mdl-36883060

ABSTRACT

Background: Vine decline disease caused by the fungus Monosporascus cannonballus, is a threat to melon production (Cucumis melo L.) worldwide. Nonetheless, little is known about the metabolites produced during the host pathogen interaction. Thus, the objective of this study was to measure quantities of amino acids produced over time during such an interaction. Methods: Two melon genotypes named TAM-Uvalde (susceptible) and USDA PI 124104 (resistant) were grown and inoculated with M. cannonballus. The metabolites previously stated were measured before inoculation (0 hours) and 24, 48 and 72 hours after inoculation, using high performance liquid chromatography analysis. Results: The production of some amino acids during the interaction of the resistant and susceptible melon genotypes with the fungus M. cannonballus was different regarding quantities over time. Interestingly, hydroxy proline was always up-regulated in higher quantities in response to pathogen infection in the genotype TAM-Uvalde. Also, the up-regulation in higher quantities of gamma-aminobutyric acid in the genotype TAM-Uvalde 48 and 72 hours after inoculation, suggests more penetration of the pathogen in its roots. Hence, taken together, hydroxy proline and gamma-aminobutyric acid levels could be used as markers of susceptibility to vine decline disease caused by M. cannonballus, which could be useful in developing resistant varieties.


Subject(s)
Antifibrinolytic Agents , Ascomycota , Cucumis melo , Flower Essences , Proline , gamma-Aminobutyric Acid , Amino Acids
5.
Exp Biol Med (Maywood) ; 247(24): 2184-2191, 2022 12.
Article in English | MEDLINE | ID: mdl-36151745

ABSTRACT

The orexigenic hormone ghrelin and its receptor, growth hormone secretagogue receptor (GHS-R), have been extensively studied in the last two decades, revealing that ghrelin signaling has important implications in health and disease. Metabolic diseases, such as obesity and diabetes, are often accompanied by low-grade chronic inflammation, that has been coined as "meta-inflammation." Immune cells are key cellular mediators of meta-inflammation, controlling both initiation and resolution of inflammation. Immune cells exhibit dynamic changes in cellular characteristics and functional output in response to the stimuli/insults from their surrounding microenvironment. Emerging evidence shows that ghrelin has an important effect on inflammation, in addition to its well-known effects on metabolism. However, the cellular/molecular mechanism of ghrelin signaling in immunity is largely unknown because the knowledge in regard to the expression and function of GHS-R in immune cells is currently sparse. In this review, we have accumulated the recent findings related to the expression and functions of GHS-R in various immune cells under different physiological and pathological states. This review aims to inspire further investigation of the immunological roles of ghrelin signaling and advance the therapeutic applications of ghrelin signaling in meta-inflammation.


Subject(s)
Ghrelin , Receptors, Ghrelin , Humans , Receptors, Ghrelin/metabolism , Inflammation/metabolism , Signal Transduction
6.
Front Plant Sci ; 13: 832522, 2022.
Article in English | MEDLINE | ID: mdl-35712570

ABSTRACT

A non-invasive and non-destructive technique, Raman spectroscopy, was explored to distinguish different maturity stages (20, 30, 40, and 50 days after anthesis) of watermelon (Citrullus lanatus) fruits from four cultivars: Fascination, Orange Crisp, Amarillo and Crimson Sweet. Spectral acquisition from the fruit surface was carried out at the wavelength range of 400-2,000 cm-1 using a handheld Raman spectrometer equipped with 830 nm laser excitation source. The spectra were normalized at 1,438 cm-1 which was assigned to CH2 and CH3 vibration. Detecting changes in the spectral features of carotenoids on the surface of watermelon fruits can be used as a marker to monitor the maturity of the fruit. The spectral analysis confirmed the presence of two major carotenoids, lutein and ß-carotene, and their intensity decreased upon maturity on the fruit surface. Identification of these pigments was further confirmed by resonance Raman spectra and high-performance liquid chromatography analysis. Results of partial least square discriminant analysis of pre-processed spectra have demonstrated that the method can successfully predict the maturity of watermelon samples with more than 85% accuracy. Analysis of Variance of individual Raman bands has revealed a significant difference among the stages as the level of carotenoids was declined during the ripening of the fruits. Thus, Raman spectral signatures can be used as a versatile tool for the non-invasive determination of carotenoid changes on the watermelon fruits' surface during ripening, thereby enabling effective monitoring of nutritional quality and maturity indices before harvesting the watermelon.

7.
Food Chem ; 382: 132585, 2022 Jul 15.
Article in English | MEDLINE | ID: mdl-35247666

ABSTRACT

Accurate, rapid quantitation of the capsaicinoid and capsinoid compounds produced by peppers (Capsicum spp.) is essential to assess quality. Here, we developed a rapid ultra-high performance liquid chromatography method for the simultaneous separation of five major capsaicinoids and three major capsinoids from peppers. Optimal chromatographic separation was achieved using a phenyl-hexyl stationary phase with a mobile phase of acidified water and methanol with a flow rate of 0.5 ml/min at a column temperature of 55 °C over 5 min. The method was validated by testing linearity, precision, robustness, and limits of detection and quantification. The developed method was successfully employed to profile capsaicinoids and capsinoids from different pepper cultivars. Out of the 10 pepper cultivars analysed, all three major capsinoids were detected in two cultivars. To the best of our knowledge, this is the first report of successful separation of nordihydrocapsiate from capsiate and quantification of nordihydrocapsiate.


Subject(s)
Capsaicin , Capsicum , Capsaicin/analogs & derivatives , Capsaicin/analysis , Capsicum/chemistry , Chromatography, High Pressure Liquid/methods
8.
Food Microbiol ; 101: 103876, 2022 Feb.
Article in English | MEDLINE | ID: mdl-34579844

ABSTRACT

The efficacy of plant-based antimicrobials against Salmonella Newport and Listeria monocytogenes on melon rinds was evaluated. Four cantaloupe and 3 honeydew melon varieties grown in Georgia, Arizona, Texas, North Carolina, Indiana and California were tested. Melon rinds (10 g pieces) were inoculated with 5-6 log CFU/10 g rind of S. Newport or L. monocytogenes. Samples were then immersed in 5 % olive extract or 0.5 % oregano oil antimicrobial solution and gently agitated for 2 min. Samples were stored at 4 °C and surviving populations of both bacteria were enumerated at days 0 and 3. Plant-based antimicrobials reduced S. Newport and L.monocytogenes population on all rind samples, regardless of the melon types, varieties or growing locations. Compared to the control, antimicrobial treatments caused up to 3.6 and 4.0 log reductions in populations of Salmonella and L. monocytogenes, respectively. In most cases, plant-based antimicrobial treatments reduced pathogen populations to below the detection limit (1 log CFU/g) at day 3. In general, oregano oil had better antimicrobial activity than olive extract and the antimicrobial treatments were more effective on Salmonella than on L. monocytogenes. The plant-based antimicrobial treatments exhibited better microbial reductions on honeydews than on cantaloupes. These antimicrobials could potentially be used as sanitizers for decontaminating melons.


Subject(s)
Anti-Infective Agents , Cucurbitaceae , Food Contamination/prevention & control , Listeria monocytogenes , Salmonella enterica , Anti-Infective Agents/pharmacology , Colony Count, Microbial , Consumer Product Safety , Cucurbitaceae/microbiology , Food Handling , Food Microbiology , Listeria monocytogenes/drug effects , Salmonella enterica/drug effects , United States
9.
Plants (Basel) ; 10(10)2021 Oct 13.
Article in English | MEDLINE | ID: mdl-34685975

ABSTRACT

Cucumis melo L is one of the most commercial and economical crops in the world with several health beneficial compounds as such carotenoids, amino acids, vitamin A and C, minerals, and dietary fiber. Evaluation of the volatile organic compounds (VOCs) in different melon (Cucumis melo L.) breeding lines provides useful information for improving fruit flavor, aroma, and antimicrobial levels. In this study, the VOCs in 28 melon breeding lines harvested in 2019 were identified and characterized using head space solid-phase microextraction (HS-SPME) coupled with gas chromatography-mass spectrometry (GC-MS). This identified 113 VOCs with significant differences in composition and contents of among the breeding lines, including 15 esters, 27 aldehydes, 35 alcohols, 14 ketones, 4 acids, 10 hydrocarbons, 5 sulfurs, and 3 other compounds. The highest average contents of all the VOCs were found in BL-30 (13,973.07 µg/kg FW) and the lowest were in BL-22 (3947.13 µg/kg FW). BL-9 had high levels of carotenoid-derived VOCs. The compounds with the highest contents were benzaldehyde, geranylacetone, and ß-ionone. Quality parameters such as color and sugar contents of melons were also measured. All the melon color readings were within the typical acceptable range. BL-22 and BL-14 had the highest and lowest sugar contents, respectively. Principal component analysis (PCA) produced diverse clusters of breeding lines based on flavor and aroma. BL-4, BL-7, BL-12, BL-20, and BL-30 were thus selected as important breeding lines based on their organoleptic, antimicrobial, and health-beneficial properties.

10.
Plants (Basel) ; 10(9)2021 Aug 24.
Article in English | MEDLINE | ID: mdl-34579288

ABSTRACT

Characterizing the diverse melon cultivars for nutrition aids in crop improvement and promoting a healthy diet. Here, we used in vitro assays to characterize the nutritional qualities and health-beneficial effects of 30 melon (Cucumis melo L.) genotypes, including 10 improved cultivars, 16 landraces, and 4 wild types collected from different parts of India. Two landraces (Sidoota and Alper Green) had the highest (12.20 and 11.25) total soluble solids (TSS) contents. The Sidoota and Pappusa landraces had high reducing sugar contents (2.84 and 2.81 mg g-1 fresh weight [FW]). The highest polyphenols contents (22.0 mg g-1 FW) were observed in the landraces Mage Kaayi-2, Budamekaayi, and Small Melon. Reflecting on the primary and secondary metabolite contents, the Mekke Kaayi and Giriyala landraces exhibited high 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity (97.6 and 91% at 100 µg mL-1). Additionally, seven of the landraces showed significant nitric oxide (NO) induction activity (>80% inhibition at 200 µg mL-1), indicating their potential health benefits, and seven showed considerable angiotensin-converting enzyme (ACE) inhibition activity (highest in Kashi Madhu), indicating their potential usefulness in reducing hypertension. Genotypes with high health beneficial compounds identified in this study can be used for breeding improved melon cultivars to promote these fruits as well as a healthy diet.

11.
Plants (Basel) ; 10(7)2021 Jul 06.
Article in English | MEDLINE | ID: mdl-34371582

ABSTRACT

Melon (Cucumis melo L.) fruits contain multiple health-promoting compounds, including phenolic compounds, which are antioxidants. Accurate measurement of antioxidant activities and total phenolic contents (TPCs) require an efficient solvent extraction. In this study, we evaluated free radical scavenging activity and TPC of melon extracts extracted with 22 different solvent combinations. The DPPH scavenging activities were high in 100% methanolic (39.48 ± 0.36 µg g-1) and 80% methanolic extracts (38.99 ± 0.44 µg g-1). Similarly, the ABTS scavenging activities were high in 100% methanolic (315.11 ± 10.38 µg g-1) and 80% methanol extracts (297.39 ± 14.98 µg g-1). The Folin-Ciocalteu (F-C) assay is typically used to measure TPC but may be affected by interference from sugars and other compounds. Therefore, we optimized an assay for TPC using Fast Blue (FB) salt and developed a standard operating procedure for microplate analysis using FB. Our analysis of standard samples and comparisons with the F-C assay suggested that the optimized FB assay could be used to measure TPC in fruit and juice samples. Moreover, we successfully detected six phenolic compounds in methanol extracts of melon by LC-HR-QTOF/MS.

12.
Nanomaterials (Basel) ; 11(4)2021 Apr 15.
Article in English | MEDLINE | ID: mdl-33921180

ABSTRACT

The use of nanoscale nutrients in agriculture to improve crop productivity has grown in recent years. However, the bioefficacy, safety, and environmental toxicity of nanoparticles are not fully understood. Herein, we used onion bulb extract to synthesize manganese oxide nanoparticles (MnO-NPs). X-ray diffraction, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy were used for the structural and morphological characterization of synthesized MnO-NPs. The MnO-NPs were oval shape crystalline nanoparticles of Mn2O3 with sizes 22-39 nm. In further studies, we assessed the comparative toxicity of seed priming with MnO-NPs and its bulk counterparts (KMnO4 and Mn2O3), which showed seed priming with MnO-NPs had comparatively less phytotoxicity. Investigating the effect of seed priming with different concentrations of MnO-NPs on the hormonal, phenolic acid, chlorophyll, and antioxidant profiles of watermelon seedlings showed that treatment with 20 mg·L-1 MnO-NPs altered the chlorophyll and antioxidant profiles of seedlings. At ≤40 mg·L-1, MnO-NPs had a remarkable effect on the phenolic acid and phytohormone profiles of the watermelon seedlings. The physiological outcomes of the MnO-NP seed priming in watermelon were genotype-specific and concentration-dependent. In conclusion, the MnO-NPs were safer than their bulk counterparts and could increase crop productivity.

13.
Food Res Int ; 140: 110016, 2021 02.
Article in English | MEDLINE | ID: mdl-33648247

ABSTRACT

Tomato (Solanum lycopersicum) fruit is a rich source of health-promoting compounds, and epidemiological studies show that tomato consumption may reduce the risk of chronic diseases. This study compared the effect of genotype, production system, and their interaction on eight tomato varieties grown in the open-field (OF) or net-house (NH), a structure completely covered with a 50-mesh screen to reduce pest and wind damage, in South Texas. The NH structure reduced solar radiation up to ~30% and decreased wind speed by 6.44 km/h compared with conditions measured in the OF. We simultaneously analyzed 16 phenolics and indoleamines using ultra-high-performance liquid chromatography coupled with quadrupole time-of-flight high-resolution mass spectrometry (UHPLC/ESI-HR-QTOFMS). The chemometric analysis showed a distinct difference between NH- and OF-grown tomatoes irrespective of the variety. The melatonin and serotonin contents showed a cultivar-specific effect of the production system. Likewise, the effect of cultivation systems on levels of phenolic acids and flavonoids varied based on tomato cultivar. Among the studied phenolic acids, significantly enhanced levels of sinapic acid were observed in OF-grown tomatoes. Similarly, we detected a considerable genotypic effect on gallic acid, p-coumaric acid, ferulic acid, sinapic acid, and naringin. The interaction of cultivar and production system substantially affected gallic acid, protocatechuic acid, sinapic acid, and apigenin. However, further studies need to be performed to explore the environment-specific effects on the total composition. In summary, our results indicate that the production system plays an important role in tomato composition beyond the natural genetic variation among cultivars.


Subject(s)
Solanum lycopersicum , Chromatography, High Pressure Liquid , Flavonoids/analysis , Fruit/chemistry , Solanum lycopersicum/genetics , Phenols/analysis
14.
Molecules ; 26(4)2021 Feb 16.
Article in English | MEDLINE | ID: mdl-33669312

ABSTRACT

Diabetes mellitus is a chronic disease and one of the fastest-growing health challenges of the last decades. Studies have shown that chronic low-grade inflammation and activation of the innate immune system are intimately involved in type 2 diabetes pathogenesis. Momordica charantia L. fruits are used in traditional medicine to manage diabetes. Herein, we report the purification of a new 23-O-ß-d-allopyranosyl-5ß,19-epoxycucurbitane-6,24-diene triterpene (charantoside XV, 6) along with 25ξ-isopropenylchole-5(6)-ene-3-O-ß-d-glucopyranoside (1), karaviloside VI (2), karaviloside VIII (3), momordicoside L (4), momordicoside A (5) and kuguaglycoside C (7) from an Indian cultivar of Momordica charantia. At 50 µM compounds, 2-6 differentially affected the expression of pro-inflammatory markers IL-6, TNF-α, and iNOS, and mitochondrial marker COX-2. Compounds tested for the inhibition of α-amylase and α-glucosidase enzymes at 0.87 mM and 1.33 mM, respectively. Compounds showed similar α-amylase inhibitory activity than acarbose (0.13 mM) of control (68.0-76.6%). Karaviloside VIII (56.5%) was the most active compound in the α-glucosidase assay, followed by karaviloside VI (40.3%), while momordicoside L (23.7%), A (33.5%), and charantoside XV (23.9%) were the least active compounds. To better understand the mode of binding of cucurbitane-triterpenes to these enzymes, in silico docking of the isolated compounds was evaluated with α-amylase and α-glucosidase.


Subject(s)
Anti-Inflammatory Agents/pharmacology , Computer Simulation , Fruit/chemistry , Glycosides/chemistry , Glycosides/pharmacology , Hypoglycemic Agents/pharmacology , Momordica charantia/chemistry , Triterpenes/chemistry , Triterpenes/pharmacology , Animals , Anti-Inflammatory Agents/chemistry , Biological Assay , Carbon-13 Magnetic Resonance Spectroscopy , Glycosides/isolation & purification , Hypoglycemic Agents/chemistry , Ligands , Mice , Molecular Conformation , Molecular Docking Simulation , Proton Magnetic Resonance Spectroscopy , RAW 264.7 Cells , RNA, Messenger/genetics , RNA, Messenger/metabolism , Triterpenes/isolation & purification , alpha-Amylases/chemistry , alpha-Amylases/metabolism , alpha-Glucosidases/chemistry , alpha-Glucosidases/metabolism
15.
Plant Sci ; 304: 110809, 2021 Mar.
Article in English | MEDLINE | ID: mdl-33568307

ABSTRACT

Melon (Cucumis melo L.) is an important diploid crop with a wide variety of flavors due to its distinct aromatic volatile organic compounds (VOC). To understand the development of VOC profiles during fruit development, we performed metabolomic and transcriptomic analysis of two cantaloupe varieties over the course of fruit development. A total of 130 metabolites were detected in fruit samples, and 449014207 reads were mapped to the melon genome. A total of 4469 differentially expressed genes in fruits were identified and used to visualize the transition of VOC and transcriptomic profiles during the fruit development. A shift of VOC profiles in both varieties was observed from early-fruit profiles enriched in C5-C8 lipid-derived VOCs to late-fruit profiles abundant in C9 lipid-derived VOCs, apocarotenoids, and esters. The shift coincided with the expression of specific isoforms of lipid and carotenoid metabolizing enzymes as well as transcription factors involved in fruit ripening, metabolite regulation, and hormone signaling.


Subject(s)
Cucurbitaceae/growth & development , Fruit/growth & development , Volatile Organic Compounds/metabolism , Amino Acids/metabolism , Carotenoids/metabolism , Chromatography, High Pressure Liquid , Cucurbitaceae/genetics , Cucurbitaceae/metabolism , Fruit/metabolism , Gas Chromatography-Mass Spectrometry , Multigene Family , Polymerase Chain Reaction , RNA, Plant/genetics , Sequence Alignment , Transcriptome
16.
Food Funct ; 12(3): 1111-1120, 2021 Feb 15.
Article in English | MEDLINE | ID: mdl-33427831

ABSTRACT

In our recent study, we demonstrated that certain limonoids isolated from citrus seeds induced apoptosis in human pancreatic (Panc-28) cells. In this study, limonin, nomilin and limonexic acid (LNA) were investigated for understanding the possible mode of cytotoxicity in cultured pancreatic cancer (Panc-28) cells. All three limonoids inhibited Panc-28 cell proliferation, with IC50 values less than 50 µM after 72 h of incubation. The induction of apoptosis was confirmed through the cleavage of caspase-3, decreased mitochondrial membrane potential, and expression of apoptosis-related proteins. The Bax/Bcl2 expression ratio was increased up to 11-fold in cells pre-treated with 60 µM limonoids for 48 h. Apart from this, the limonoids also induced the expression of p21, and exhibited anti-inflammatory activity through decreasing the expression of cox-2, NF-κB and IL-6. Based on these results, we were interested in understanding the possible mode of inhibition by LNA, which exhibited the highest activity. The treatment of Panc-28 cells resulted in dose- and time-dependent induction of apoptosis-inducible proteins. In addition, treatment with 60 µM LNA resulted in the activation of Akt-associated signals to induce apoptosis, and the same was confirmed by the effects of the compounds on pAkt, p53, VEGF and caspase proteins. The results of this study demonstrated the cytotoxicity of limonoids to human pancreatic cancer cells through the modulation of genes involved in proliferation and survival.


Subject(s)
Antineoplastic Agents, Phytogenic/pharmacology , Apoptosis/drug effects , Cell Proliferation/drug effects , Citrus , Limonins/pharmacology , Pancreatic Neoplasms , Antineoplastic Agents, Phytogenic/chemistry , Cell Line, Tumor , Cell Survival/drug effects , Humans , Limonins/chemistry , Molecular Structure
17.
Plant Foods Hum Nutr ; 76(1): 60-67, 2021 Mar.
Article in English | MEDLINE | ID: mdl-33420704

ABSTRACT

Accurate, rapid quantitation of key antioxidants such as carotenoids is important for assessment of food quality. Carotenoids are lipid-soluble pigments that are susceptible to oxidation due to their highly conjugated carbon-carbon double bonds. Therefore, the present work focuses on improving sample preparation to facilitate rapid analysis of carotenoids. The method involves optimized carotenoid extraction followed by direct HPLC analysis without further concentration and redissolution. For extraction, we tested the effect of blending time (1, 3 and 5 min) and 12 different solvent combinations for carotenoid extraction from cantaloupe (Cucumis melo var. cantalupensis) and oranges (Citrus sinensis), two popular fruits that are high in carotenoids. The identification of carotenoids was performed by LC-APCI-QTOF-HR-MS in positive-ionization mode. In melon, 1 min blending time gave significantly higher ß-carotene content with CHCl3: Ace (1:1) solvent. The optimized method was validated with tomato, watermelon, oranges, grapefruit, melon varieties and commercial products such as fruit juices. Among the different melon varieties, Western Shipper had significantly higher ß-carotene (25.1 ± 0.4 µg/g) contents. In oranges, ß-carotene and (all-E)-lycopene contents were 4.4 ± 0.1and 3.8 ± 0.1 µg/g, respectively. The optimized method has fewer unit operations and is reproducible for the quantitation of carotenoids and their isomers. This is the first report on the identification of ζ-carotene isomers, and lycopene isomers from cantaloupe varieties and lycopene from oranges. Graphical Abstract.


Subject(s)
Carotenoids , beta Carotene , Fruit , Lycopene , Solvents
18.
Virus Res ; 293: 198266, 2021 02.
Article in English | MEDLINE | ID: mdl-33347906

ABSTRACT

Melon is one of the most popular fruits worldwide and has been bred into various cultivars. RNA-sequencing using healthy melon fruit was performed to determine differences in gene expression among cultivars. Unexpected RNA-seq results revealed that viruses asymptomatically infected fruits at a high frequency (16 of 21 fruits examined were infected) and that viral transcripts highly accumulated in comparison with host transcripts (15 %-75 % of total reads). Their nucleotide sequences and phylogenetic analyses indicated that more than 10 novel isolates of tobacco ringspot virus (TRSV) were found in melon fruits. Asymptomatic infection with TRSV on melon fruits was confirmed by both immunoblot and RT-PCR analyses. Numerous isolates of TRSV generated and maintained in melon fields, and this is likely due to their asymptomatic infections. This TRSV melon isolate infected Nicotiana benthamiana plants with stunting and yellowing symptoms. This is the first report of frequent and asymptomatic infection of TRSV in consumable melon fruits.


Subject(s)
Cucurbitaceae , Nepovirus , Fruit , Phylogeny , Plant Diseases
19.
J Sci Food Agric ; 101(1): 307-314, 2021 Jan 15.
Article in English | MEDLINE | ID: mdl-32623742

ABSTRACT

BACKGROUND: Polyphenol oxidase (PPO) and peroxidase (POD) are key enzymes associated with shelf life and defense responses. Thus, the activity of PPO and POD enzymes is usually assessed to check the quality of food samples and to understand the physiological responses of plants to different stresses. However, the outcomes of PPO and POD activity assessment studies are highly dependent on assay conditions. Hence, in this study, we initially optimized PPO and POD extraction and high-throughput 96-well plates-based enzymatic activity assessment methods to evaluate the inhibitory potential of tomato volatile compounds. Later, we explored the effects of net-house and open-field growing on the PPO and POD activity in tomato fruits of eight cultivars. RESULTS: We found 150 mM of catechol and pH 7.0 were the optimal conditions for the maximum activity for the PPO assay. Conversely, 24 mM guaiacol with 12 mM H2 O2 and pH 6.0 was the best condition for the POD assay. Thermal inactivation studies confirmed that tomato POD is more resistant to heat than PPO. We found that the production systems had a considerable genotype-specific impact on tomato PPO and POD activity. Moreover, amongst the volatiles that were studied, ß-damascenone and d-limonene showed 50% PPO inhibition at 40 and 80 mM, respectively. CONCLUSION: The results of this study can be used to improve the shelf-life of fresh tomato fruit and its products. The findings also underscore the significance of PPO and POD enzymes as physiological trait markers in the tomato crop and fruit quality improvement programs. © 2020 Society of Chemical Industry.


Subject(s)
Catechol Oxidase/chemistry , Peroxidase/chemistry , Solanum lycopersicum/enzymology , Enzyme Assays , Enzyme Stability , Fruit/chemistry , Fruit/enzymology , Kinetics , Odorants/analysis , Volatile Organic Compounds/chemistry
20.
J Food Sci ; 85(11): 3806-3814, 2020 Nov.
Article in English | MEDLINE | ID: mdl-33073376

ABSTRACT

Tomato is an important source of health-promoting constituents, and researchers have focused on enhancing the content. In the present study, the influence of net-house (NH) and open-field (OF) growing conditions on physicochemical traits of tomatoes from eight different cultivars were evaluated. The tomato fruit qualities, such as color, total soluble solids (TSS), total acidity (TA), and pH were measured. Furthermore, ultra-performance liquid chromatography coupled to electrospray ionization high-resolution quadrupole time-of-flight mass spectrometry (UPLC/ESI-HR-QTOFMS) was used for identification and quantification of health-promoting compounds such as ascorbic acid, ß-carotene, lycopene, and its isomers. In addition, in vitro bile acid binding capacity of all tomato samples was analyzed along with soluble and insoluble dietary fiber analysis as biofunctional properties. The results suggest that production systems influenced tomato fruit quality and biofunctional characteristics in a variety-specific manner. Notably, TA and all-trans-ß-carotene values were considerably influenced by production systems, and their levels were higher in the NH- and OF-grown tomatoes, respectively. Our findings underline the importance of the rational choice of genotype and production system to obtain high-quality tomatoes with enhanced desired traits for breeders and consumers. PRACTICAL APPLICATION: Tomato is one of the nutritional high-valued horticultural crops. The present study aimed to assess the impact of production systems, such as net-house and open-field conditions, on physicochemical traits and biofunctional properties, in vitro bile acid binding capacity of eight tomato varieties. This study supplies a good reference for the rational selection of genotype and production system to obtain high-quality tomatoes with improved desired traits for breeders and consumers.


Subject(s)
Bile Acids and Salts/metabolism , Fruit/chemistry , Fruit/metabolism , Solanum lycopersicum/chemistry , Solanum lycopersicum/genetics , Genotype , Humans
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