Cocoa (Theobroma cacao L.) is a beverage crop with high economic value. Provision of natural PGR, namely red unions, which will be extracted. This study aimed to determine the effect of red ...onionxtract (Allium cepa L.) as a growth regulator on cocoa seeds. The research was conducted at a screen house at the Polytechnic of Agricultural Development Manokwari (Politeknik Pembangunan Pertanian Manokwari). The study method used was a completely randomized design (CRD), using five treatments and 20 replications, so the number of samples was 100 seeds. The treatments tested on cocoa plant seeds P0 (control), P1 (25% concentration of red onion extract), P2 (50% concentration of red onion extract), P3 (75% concentration of red onion extract), and P4 (100% concentration of red onion extract). The measurement variables included germination percentage, plant height, stem diameter, number of leaves, and seedling growth percentage. Differences in the concentration of growth regulators of red onion extract had a significantly different effect on seedling percentage and seed growth percentage and had a significant effect on plant height, stem diameter, and number of leaves of cocoa seedlings. Soaked cocoa seeds in red union extract with a concentration of 25% give optimum results.
Remote sensing (RS) platforms such as unmanned aerial vehicles (UAVs) represent an essential source of information in precision agriculture (PA) as they are able to provide images on a daily basis ...and at a very high resolution. In this framework, this study aims to identify the optimal level of nitrogen (N)-based nutrients for improved productivity in an onion field of “Cipolla Rossa di Tropea” (Tropea red onion). Following an experiment that involved the arrangement of nine plots in the onion field in a randomized complete block design (RCBD), with three replications, three different levels of N fertilization were compared: N150 (150 kg N ha−1), N180 (180 kg N ha−1), and e N210 (210 kg N ha−1). The crop cycle was monitored using multispectral (MS) UAV imagery, producing vigor maps and taking into account the yield of data. The soil-adjusted vegetation index (SAVI) was used to monitor the vigor of the crop. In addition, the coverage’s class onion was spatially identified using geographical object-based image classification (GEOBIA), observing differences in SAVI values obtained in plots subjected to differentiated N fertilizer treatment. The information retrieved from the analysis of soil properties (electrical conductivity, ammonium and nitrate nitrogen), yield performance and mean SAVI index data from each field plot showed significant relationships between the different indicators investigated. A higher onion yield was evident in plot N180, in which SAVI values were higher based on the production data.
Onion is one of the potential horticultural plants in Yogyakarta Special Region. Onion production center is located in District Saden and Imogiri District, Bantul regency. This research has ...objectives to (1) know the onion marketing chain in Bantul Regency and (2) to know the most efficient marketing channel using Acharya method. Respondents were randomly selected as many as 60 onion farmers in Bantul District. Snowball method is used to get two wholesalers, three merchant collectors, and three retailers by following the distribution of onion sales from farmers to consumers. The results showed that the onion marketing chain in Bantul district consists of three marketing channels. The most abundant onion chain of marketing compositions in Bantul District is farmers-wholesalers-collectors-retailers-consumers, farmers-wholesalers-collectors, and farmers- collectors-retailers. Marketing on onion in Bantul Regency is done most efficiently in the third marketing channel that is farmers-collectors-retailers. This research is expected to give information about the marketing chain of onion in Bantul regency.
•Red onion solid waste (ROSW) utilized for extraction and analysis of value added bioactives.•Chromatographic and spectroscopic analysis showed high content of quercetin and spiraeoside in ...ROSW.•Significant free radical scavenging activity displayed by extracted flavonoid glycosides from ROSW.•Potent cytotoxic effects observed for flavonoid glycosides against human cancer cell lines.•Flavonoid glycosides exhibited good in vitro and in silico enzyme inhibitory effects.
Flavonol glucosides was extracted from red onion solid waste (ROSW) and multi-functional properties were determined to develop alternative strategy for therapeutic beneficiation and utilisation as functional food. The major flavonol glucosides extracted from ROSW were confirmed as quercetin-3, 4′-O-diglucoside (QDG), quercetin-3-O-glucoside (isoquercetin), quercetin-4′-O-glucoside (spiraeoside), isorhamnetin- 4′-glucoside (IMG), quercetin glycoside (QG), and quercetin (Q) using a combination of chromatographic, spectroscopic and scientific literature data. The ROSW solvent fractions and extracted flavonol glucosides showed significant antioxidant effect with DPPH, ABTS, FRAP, and ORAC radical scavenging assays. The in vitro and in silico study revealed that the QG, QDG, isoquercetin, and spiraeoside from ROSW exhibited potent α-glucosidase, tyrosinase and xanthine oxidase enzyme inhibitory activity. In addition, QG, QDG, isoquercetin, and spiraeoside showed potent anticancer effect on HeLa cancer lines. Considering these results, the utilization of ROSW and their flavonol glucosides might be helpful for developing potential antioxidant, anticancer and enzyme inhibitory agents.
Red onion skin waste (ROSW) was analyzed for extraction of naturally occurring 4′-O-glucoside of quercetin, spiraeoside (SPI) with promising biological activities. Reversed-phase high-performance ...liquid chromatography was used to determine the SPI content in three different solvent extracts of ROSW: water (12.2 mg/g), methanol (27.6 mg/g), and ethanol (32.5 mg/g). The ethanol extract and SPI showed significant radical-scavenging and anti-inflammatory activities. In addition, the anti-cancer effects of SPI on a HeLa cells was investigated. The results indicated that SPI treatment significantly inhibited cell growth, and the dose of 50 μg/mL exhibited the highest anti-cancer activity. SPI inhibited the expression of B-cell lymphoma 2 and BH3-interacting domain-death agonist and promoted apoptosis by activating caspase-9/-3 expression. Notably, SPI inhibited the expression of mu-2-related death-inducing gene, a molecule involved in death receptor-mediated apoptotic signaling. Cyclin-dependent kinase 2-cyclin-E expression was also inhibited after SPI treatment, particularly at the G2/M checkpoint. Our findings provide novel insights into the apoptotic potential with promising anticancer and enzyme inhibitory effects of ROSW SPI.
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•Spiraeoside is a naturally occurring quercetin glucoside extracted from red onion skin.•Red onion skin and spiraeoside showed potential antioxidant and anti-inflammatory effects.•Red onion skin spiraeoside showed promising anti-cancer effect against HeLa cell.•Spiraeoside provided novel insights on apoptotic potential and enzyme inhibitory effects.
Biochar has widely been utilized as an agricultural soil amendment owing to its enhanced surface properties and cost-effectiveness. In the present work, the influence of tea waste biochar (TWBC) upon ...acid modification on Allium cepa L. (red onion) growth has been studied. Its effect as a soil amendment has also been studied by assessing the nutrient retention, microbial population growth and immobilization of potentially toxic metal ions. A greenhouse experiment was carried out by applying different biochar (BC) ratios (2% and 5% w/w) to soil as the growth media for onion plants. A 2.4 times (2.4 × ) reduction of phosphate from leaching was observed upon BC application at a ratio of 2% than that of 5%. Moreover, red onion plants that grew in the BC-fertilizer amended soil at a 2% ratio showed higher growth compared to that of 5%. A ∼1.3 × and ∼1.2 × increment of total dry weight was observed upon amendment of soil fertilizer system with nitric and sulfuric acid-modified TWBC, respectively. An analysis of the potentially toxic metal ion uptake by the respective plant parts showed that lead uptake by the roots of red onion was ∼8.3 × less in BC amended soil compared to that in contaminated soil. Thus, acid-modified TWBC can be considered a potential soil amendment for an enhanced red onion growth. Employing TWBC as a soil amendment in tropical countries, where tea-waste is in abundance, will boost sustainable agriculture.
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•Effect of acid modified tea waste biochar on Allium cepa L. growth was evaluated.•Application ratio of 2% biochar exhibited the highest plant growth characteristics.•Reduced nutrient leaching upon incorporation of modified biochar.•Toxic metal ion uptake by plants was reduced upon biochar application.
•Red onion scale (ROS) is produced as a food waste product.•ROS improved FBG, AGEs levels and increased serum insulin level significantly.•ROS down-regulated the inflammatory mRNA expression gene ...associated with hyperglycemia.•ROS ameliorated the histopathological alterations in kidney tissue.•The metabolic profiling of ROS was performed via RP-HPLC-DAD-QTOF-MS and -MS/MS.
The present study was designed to investigate the effect of red onion scales extract (ROS) against diabetic nephropathy, in relation to its metabolic profiling.
Four groups of male Wistar rats were assigned as follows; 1st untreated group, 2nd group (animals with diabetes) treated with streptozotocin (STZ, 50 mg/kg) IP, 3rd group co-treated with ROS (150 mg/kg + STZ, 50 mg/kg) and 4th group co-treated with ROS by a dose (300 mg/kg + STZ, 50 mg/kg) daily. After four weeks, random and fasting blood glucose (FBG) levels, serum insulin, advanced glycation end products (AGEs), urea, uric acid and inflammatory and fibrotic gene expression were evaluated. Moreover, histopathological examination of the renal tissues was performed. In addition, the metabolic profiling of ROS was performed via RP-HPLC-DAD-QTOF-MS and -MS/MS.
The metabolic profiling of ROS revealed that protocatechuic acid and cyanidin-3-O-glucoside were the predominant compounds among 32 metabolites identified in the extract. ROS treated groups showed improvement of FBG and AGEs levels, whereas serum insulin level showed significant elevation. In addition, down-regulation of inflammatory mRNA expression associated with the hyperglycemic condition and amelioration in histopathological alterations in kidney tissues were observed.
This study displayed the presence of 32 phenolic compounds in the ethanolic extract of ROS, a common by-product of the industrial production of onion in Egypt. This study proved the therapeutic potential of ROS as antidiabetic agent and its preventive effect against diabetic nephropathy. Therefore, this study represents a perspective of the utilization of food waste products.
The characterization of bioactive metabolites and the protective effects against Cadmium (Cd) of the hydroalcoholic extract from Allium cepa var. Tropea (Tropea red onion) in human Caco-2 colon ...adenocarcinoma cells and in vitro antioxidant effects were investigated. Tropea red onion extract showed high levels of bioactive compounds and a strong activity as radical scavenger and inhibitor of lipid peroxidation. The most abundant specialized metabolites were quercetin derivatives. In addition, the extract inhibited NO release in a dose-dependent manner. Exposure of Cd treated human Caco-2 cells to the Tropea red onion extract resulted in a higher cytoprotection with a significant falloff of cells damage produced by Cd. The effect of Tropea red onion evaluated with the MTT assay and LDH test, was time-dependent and more evident after 24h of treatment. Caco-2 cells treated with the Tropea red onion extract and CdCl2 at 24h showed a significant cytoprotection at concentrations equal to 50 μg/mL + 25 μM and 100 μg/mL + 25 μM while at 72h at a concentration of 25 μg/mL + 25 μM. We observed with MTT and LDH assays that treatment of cells with Tropea red onion extract at 24h was able to significantly prevent Cd-induced cytotoxicity alone.
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•Cadmium is one of the most toxic environmental pollutant.•Phytochemical and biological characterization of Tropea red onion.•Tropea red onion extract prevent Cd-induced cytotoxicity in human adenocarcinoma.
Carbon dioxide (CO2) is considered one of the eco-related key factors that negatively affect global climatic change. Also, CO2 can play an important role in the postharvest quality of the ...agri-products. In this study, the impact of CO2 on the quality of postharvest onions that were stored at 23 °C for 8 weeks was investigated. The weight loss, phenolic, flavonoid, flavanol, anthocyanin, antioxidant activity, and soluble sugar were analyzed during the study period. The results showed that 20% CO2 treatment was significantly (P > 0.05) more effective than 15% CO2 and control in inhibiting weight loss. Additionally, 20% CO2 treatment significantly retained higher antioxidant enzyme activities such as CAT, APX, and SOD than 15% CO2 and control. During storage, 20% CO2 treatment significantly (P < 0.05) improved glucose, fructose, and sucrose levels by more than 15% CO2 exposure and control groups. Besides the chlorogenic acid, kaempferol and quercetin were significantly (P < 0.05) higher in the 20% CO2 than in the 15% CO2 after 2 weeks of storage. In conclusion, this study's novelty comes from the broad prospects of using CO2 for maximizing the stored onion phytochemical functionality that is usually affected by the room temperature long storage. This will help in the onion shelf-life extension by considering the quality-related attributes.
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•Elevated CO2 enhanced the quality of onions.•Treatment of 20% CO2 significantly (P > 0.05) reduced the onion weight loss.•Carbon dioxide enhanced the phenolics compounds and antioxidant activities during storage.•Fructose was positively corrected with ferulic acid (r2 = 0.965) and negatively with quercetin.•Chlorogenic acid was increased after 3 weeks of storage and then decreased from 4 to 8 weeks.
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