Ascorbic acid content in apple pulp, peel, and monovarietal cloudy juices of 64 different cultivars

The experiment was conducted during two consecutive seasons (years 2016 and 2017) in an organic apple orchard of the cultivar Jonathan. Several biostimulants were tested (10 in total), including humic acids, macro and micro seaweed extracts, alfalfa protein hydrolysate, amino acids alone or in combination with zinc, B-group vitamins, chitosan and a commercial product containing silicon. Treatments were performed at weekly intervals, starting from the end of May until mid-August. The macroseaweed extract was effective in stimulate tree growth potential in both years, as shown by a significantly larger leaf area (+20% as compared to control) and by an higher chlorophyll content and leaf photosynthetic rate in year 2016. As for the yield performances and apples quality traits at harvest (average fruit weight, soluble solids content, titratable acidity, and flesh firmness), they were generally affected by the different climatic conditions that characterized the two growing seasons (year 2017 being characterized by higher maximal and average temperatures and by limited rainfalls at the beginning of the season). Treatments with macroseaweed extract, B-group vitamins and alfalfa protein hydrolysate were able to significantly improve the intensity and extension of the red coloration of apples at harvest. Correspondingly, the anthocyanin content in the skin of apples treated with the same biostimulants resulted significantly higher than control, highlighting the potential influence of these substances on the synthesis of secondary metabolites in apple. The incidence of physiological disorders was also monitored during apple storage period. Amino acids plus zinc application was effective in reducing (more than 50%) the incidence of the “Jonathan spot,” the main post-harvest disorder for this cultivar.

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“…The quantification of ascorbic acid was determined using the methodology described in Bassi et al (2018) . Briefly, an aliquot of ca.…”

Section: Methodsmentioning

confidence: 99%

Use of Biostimulants for Organic Apple Production: Effects on Tree Growth, Yield, and Fruit Quality at Harvest and During Storage

et al. 2018

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“…The analytical method for the ascorbic acid was based on Bassi et al [44]. A total of 50 mg of freeze-dried sample was extracted using 1 mL of the extraction solution (700 µL deionized H 2 O containing 8% (v/v) acetic acid and 3% (w/v) metaphosphoric acid added with 300 µL of methanol) [45], mixed at 3200 rpm for about 20 s at room temperature and filtered through a 0.20 µm PTFE filter.…”

Section: Ascorbic Acid Quantificationmentioning

confidence: 99%

Foliar Applications of Biostimulants Promote Growth, Yield and Fruit Quality of Strawberry Plants Grown under Nutrient Limitation

et al. 2019

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Biostimulants have been found effective in enhancing plant resistance toward stressful conditions. The aim of the present study was to evaluate the efficacy of selected biostimulants to overcome the negative effects of nutrient limitation on the growth performances and on the fruit quality of soilless cultivated strawberry plants. The condition of nutrient limitation was imposed by supplying the plants with only a single fertilization at transplantation and by excluding any further nutrient supply for the entire duration of the experiment (three months, from May to July). Strawberry plants were treated seven times during the period from preflowering up to berry maturation with different classes of biostimulants (humic acids, alfalfa hydrolysate, macroseaweed extract and microalga hydrolysate, amino acids alone or in combination with zinc, B-group vitamins, chitosan, and a commercial product containing silicon) at commercial dosages. The use of alfalfa hydrolysate, vitamins, chitosan, and silicon was able to promote biomass accumulation in roots (four to seven folds) and fruits (+20%) of treated plants, whereas the total leaf area increased by 15%–30%. Nutrient concentrations in leaves and roots showed variations for microelements (e.g., Fe, B, Zn, and Si) in response to biostimulant applications, whereas no significant differences were observed for macronutrient contents among treatments. Final berry yield was found around 20% higher in chitosan- and silicon-treated plants. Chitosan treatment significantly increased pulp firmness (by 20%), while a high nutritional value (e.g., phenolic compounds concentration) was observed in alfalfa- and seaweed-treated fruits (+18%–20% as compared to control). The overall outcomes of the present experiment show that selected biostimulants can be considered as a valid agronomic tool able to contrast the negative consequence of growing crops under insufficient nutritional conditions.

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“…are among the most consumed fruits worldwide and appreciated for their content of beneficial compounds. [1][2][3][4][5][6] The global annual production exceeds 70 Mio t, with the European Union being the second largest producer after China. [7] South Tyrol, Italy, with ca.…”

Section: Introductionmentioning

confidence: 99%

“…The fruit is a rich source of minerals, fibers, and antioxidant compounds such as polyphenols and vitamins. [1][2][3][4][5][6]9] Apples' phytochemicals have been consistently associated with health benefits like reducing the risk of coronary heart disease, asthma, and diabetes. [,3,5] Moreover, apples have positive effects on the human lipid metabolism, resulting in reduction of total cholesterol [10] and promoting weight loss.…”

Section: Introductionmentioning

confidence: 99%

L-ascorbic acid and α-tocopherol content in apple pulp: a comparison between 24 cultivars and annual variations during three harvest seasons

Bianchi

Soini

Ciesa

et al. 2020

International Journal of Food Properties

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This study aimed to analyze the most important apple vitamin, L-ascorbic acid (AsA), and the most abundant fat-soluble one, α-tocopherol, in the pulp of 24 cultivars from harvest season 2010 and in six cultivars collected over three consecutive years (2008-2010). All cultivars were grown and stored under identical conditions and identified as 'true to type' by molecular genetic tools. The two vitamins were analyzed using high performance liquid chromatography with diode array detection (HPLC-DAD), involving two rapid methods with excellent recovery, linearity, precision, and sensitivity. Results showed an intriguing diversity of AsA contents and, to a lesser extent, of αtocopherol in biological replicates, between cultivars and harvest years. Nevertheless, cultivar-specific relative vitamin contents can be deduced from this study. Among the 24 cultivars, a minimum AsA content of 0.43 ± 0.13 mg/100 g fresh weight (FW) and a maximum of 6.22 ± 1.06 mg/ 100 g FW have been found in 'Gala' and 'Freiherr von Berlepsch,' respectively. α-tocopherol ranged from 0.13 ± 0.02 mg/100 g FW to 0.33 ± 0.04 mg/100 g FW for 'Freiherr von Berlepsch' and 'Brixner Plattling,' respectively. The results of the present study suggest a potential of some old cultivars as a component of a healthy, vitamin-rich diet.

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Ascorbic acid content in apple pulp, peel, and monovarietal cloudy juices of 64 different cultivars

Cited by 38 publications

References 32 publications

Use of Biostimulants for Organic Apple Production: Effects on Tree Growth, Yield, and Fruit Quality at Harvest and During Storage

Use of Biostimulants for Organic Apple Production: Effects on Tree Growth, Yield, and Fruit Quality at Harvest and During Storage

Foliar Applications of Biostimulants Promote Growth, Yield and Fruit Quality of Strawberry Plants Grown under Nutrient Limitation

L-ascorbic acid and α-tocopherol content in apple pulp: a comparison between 24 cultivars and annual variations during three harvest seasons

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