جستجوی مقالات مرتبط با کلیدواژه « اسید آسکوربیک » در نشریات گروه « باغبانی »

In Iran, Sweet cherry is one of the most important horticultural products in temperate regions. So it is necessary to use micropropagation methods to accelerate its reproduction. This study was conducted as factorial experiment based on completely randomized design with two cultivars (Adli and Takdaned), and browning reduction treatments in four levels (dark, cold, dark and cold, antioxidant (100 mg/l ascorbic acid and 150 mg/l citric acid)) and proliferation growth regulators BAP at concentrations of (0, 1 and 2 mg/l) and IBA (0 and 0.01mg/l) and rooting stage treatments consisted of NAA (0 and 1 mg/l) and IBA (0 and 2 mg/l).The results showed that there was significant difference between treatments. The highest and lowest levels of browning were in cold treatment and antioxidan treatment, respectively. The highest number of shoots for Takdaneh (5.6) and for Adli (5) cultivars were 5.6 and 5, respectively. The highest rooting percentage was obtained for Takdaneh (78.73%) and Adli (69. 4%). In general, for Adli and Takdaneh cultivars in vitro propagation, MS culture medium containing 2 mg/L BAP and 0.01 mg/L IBA in the proliferation stage and 2 mg/L IBA in the rooting stage is recommended.

The present study aimed to investigate the effect of postharvest polyamine application on the physicochemical characteristics, bioactive compounds, and antioxidant activity of sweet lime fruit. The fruits were dipped in putrescine (2 and 4 mM), spermidine (1 and 2 mM), spermine (1 and 2 mM), or distilled water (control) for 10 min. Evaluations were conducted after 2 and 4 months of storage at 10 °C and 85% relative humidity. In general, treatments had no effect on the total acid and pH of the fruit juice. Using polyamines led to lower rates of weight loss or decreases in juice total soluble solids, and treated fruits had a better taste index when compared to the control. The content of ascorbic acid in fruit juice increased with storage time, but total phenol content and antioxidant activity decreased. When compared to the control, polyamine-treated fruits had higher levels of ascorbic acid, total phenol, and antioxidant activity in the juice. The treatment with both concentrations of spermine had the greatest efficacy in maintaining the juice taste index and ascorbic acid content than the other treatments. Fruits treated with spermine and spermidine had the same taste index. Moreover, spermine-treated fruits had the same amount of ascorbic acid as fruits treated with 2 mM spermidine and putrescine. Finally, dipping in 1 mM spermine was found to be the most effective treatment for reducing weight loss and preserving juice total phenol content and antioxidant activity, and is recommended as the best treatment for preserving sweet lime fruit quality.

In the current study, for reducing of fruit cracking and improvement of quantity and quality of pomegranate fruit cv. ‘Malase Saveh’, gibberellic acid (0, 30 and 60 mg/l) and zinc sulfate (0, 1500 and 3000 mg/l) treatments were utilized as a factorial experiment based on randomized complete block design with three replications. Gibberellic acid and zinc sulfate was sprayed in three stages of fruit developmet in the late of spring and midsummer. The fruit and leaf samples were harvested randomly from various parts of the pomegranate trees at fruit ripening and some morpho-physiological characteristics of fruit and leaf were measured. The results showed that the spraying of gibberellic acid alone or in combination with zinc element significantly reduced the fruit cracking percentage compared to the control. The lowest level of fruit cracking was related to gibberellic acid treatments with levels of 60 and 30 mg/l and 3000 mg/l zinc element with mean values of 7.73 and 7.80%, respectively. The highest amount of fruit cracking was observed in control samples (30 %). The fruit weight, length and diameter, moisture percentage and thickness of fruit peel, TSS, zinc element and ascorbic acid concentrations significantly were increased with application of 60 and 30 mg/l gibberellic acid, and 3000 mg/l zinc sulfate compared with the control samples. In general, the results showed that spraying of pomegranate trees with gibberellic acid and zinc sulfate can improved some morpho-physiological characteristics of the fruit, which are effective in controlling of fruit cracking and increasing the qualitative and quantitative characteristics of pomegranate fruit.

Dog rose (Rosa canina L.) is one of the most valuable medicinal plants belonging to Rosaceae, which is distributed in different parts of Iran. In this study, the fruit of different populations of the species was collected from Khorramabad, Noorabad, Aleshtar, Dorud and Aligudarz cities of Lorestan province, and evaluated for morphological and phytochemical traits in a completely randomized design with six replications. The traits included the fresh weight of fruit, fresh and dry weight of flesh, seed weight per fruit, flesh width, the content of phenols and flavonoids, ascorbic acid content and oil percentage. The results of ANOVA indicated that all traits studied (except flesh width) were significantly affected by the region. According to the mean comparison results, Noorabad population had the highest amount of fruit dry weight (0.95 g), seed weight per fruit (1.11 g), fruit length (24.96 mm), flavonoids (22.18 and 16.29 µg routine/ mg dry extract, respectively in ethanolic and methanolic extracts) and phenols (50.81 and 25 µg gallic acid/ mg dry extract, respectively in ethanolic and methanolic extracts) content, and ascorbic acid (0.42) and oil (14.56) percentage. There was a positive and significant correlation between ascorbic acid and oil percentage with fruit dry weight and seed weight per fruit. Therefore, it can be concluded that the bigger fruits are probably more nutritious and more medicinal, and maybe, this correlation can be used for selective selection of superior dog rose ecotypes based on morphological traits. According to the results of the present research, Noorabad population can be recommended as the superior ecotype for future breeding programs of the species.

This experiment was conducted to investigate the effects of calcium lactate and putrescine on postharvest quality of Capsicum annuum as randomized complete design with three replications in postharvest laboratory of Shahid Bahonar university of Kerman, Iran. Treatments consisted of fruits immersion in putrescine solutions (1 and 2 mM) and spraying with calcium lactate solutions (2 and 3 mg/L) and distilled water was applied as control for five minutes. Then, Fruit samples were transferred to cold storage with temperature of 8±1° C and RH 90±5%. The weight loss percentage, decay content, total chlorophyll content, peroxidase and polyphenol oxidase activities, ascorbic acid content and ion leakage were measured at the end of 33th days of storage. Results showed that treated fruit with putrescine 2mM had the lowest weight loss, decay content and percent ion leakage and the most total chlorophyll content, peroxidase and polyphenol oxidase activities and ascorbic acid content. According to results the use of this edible coating is recommended to increase the shelf life of pepper fruits.

In order to study the effect of calcium acetate on shelf life, maintaining qualitative characteristics and reduction of postharvest decay of apricot fruit cv. ‘Shekar Pareh’, a factorial experiment was performed in a randomized complete design with 4 replications. Fruit harvested at the commercial maturity and immediately were transferred to postharvest laboratory of university of Zanjan. Then, fruits were immersed in different concentrations of calcium acetate [0 (control), 12.64 and 31.61 mM] for 10 minutes. Treated fruit were packed in boxes with polyethylene cover and stored at 4 °C and 95±5% relative humidity for one month. Quantitative and qualitative parameters of the fruitwere measured in three times (10, 20, 30 days of storage). The results showed that application of calcium acetate significantly inhibit weight loss and also maintain the firmness of the fruit. Ascorbic acid was reduced during the storage time and the lowest ascorbic acid measured in control. Calcium acetate prevented of increasing TSS. Immersion in calcium acetate increased TA, calcium concentration, moisture content and reduced carotenoids and TSS/TA ratio. Calcium acetate by reduction of postharvest decay caused increasing shelf life of apricot fruit. Overall, it can be concluded that, the quality of apricot was improved by application of calcium acetate which delayed the ripening of fruits.

Seedless barberry (Berberis vulgaris L. var. asperma) is one of the most important horticultural and medicinal crops and also valuable fruit in South Khorasan province. Fresh barberry fruit has a very short shelf life, due to the sensitive juicy fruit tissue in the ripening stage and decay during storage. Hence, most of the harvested fruits are dried traditionally or processed as juice, jam, and other products. However, the quality of both fresh and dried fruit is low due to different environmental stresses such as drought and salt stress and consequently deficiency of minerals during growth and development and also at harvest and during storage. It has been reported that pre-harvest foliar spray of calcium salts and salicylic acid can improve resistance to pathogens before harvest and reduce physiological disorders during handling and storage in many fruits. However, there is no information regarding the effect of calcium and salicylic acid spray as well as storage duration on fresh seedless barberry fruit. The objective of the current study, therefore, was to investigate the effects of the preharvest application of calcium chloride and salicylic acid on physiological attributes and postharvest quality of barberry fruits during long-term cold storage. The experiment was conducted as split-plot in time and in a randomized complete block design with five treatments and in three replicates in the Research Orchard of Agricultural Faculty of the University of Birjand during 2014. Fifteen similar and 25-years old trees were used for the experiment. Pre-harvest treatments of foliar spraying were salicylic acid (1 and 3 mM) and calcium chloride (1 and 2%) and distilled water as control. Sprays were applied at 30 and 15 days before harvest. Fruits were harvested at commercial ripening stage, packed in plastic boxes and stored at cold room at 4±0.5 °C and 85±5 RH. Physicochemical and quality evaluations including fruit fresh weight and volume, and juice volumes of 100 berries, pH, total soluble solids (TSS), titrable acidity (TA), ascorbic acid, weight loss, electrolyte leakage of fruit and calcium content of leave and fruit were measured at harvest and after 30, 60 and 90 days of storage. Analysis of data was performed using Gen Stat program (ver 12) and comparison of means was done by LSD test at 5% probability. The analysis of variance showed that the main effects of foliar spray with calcium chloride, salicylic acid and interaction of treatments were significant in storage time. The results showed that 1 mM of salicylic acid increased the fruit fresh weight, fruit volume and fruit juice, pH, total soluble solids, ascorbic acid and titrable acidity compared to other treatments. It has been reported that salicylic acid increases cell division and growth resulting in greater yield. It was also observed that application of salicylic acid at 3mM reduced electrolyte leakage significantly that can be useful to reduce chilling injury. The lowest weight loss was obtained in sprayed fruit with calcium chloride (2%) during cold storage, in agreement with the previouswork on plum. Foliar application of calcium chloride increased the calcium content of leave and fruit, although calcium application was not a significant effect in fruit tissue. Generally, using of chemical treatments increased the physicochemical characteristics of the fruit in seedless barberry, among them calcium chloride 2% and salicylic acid at 1 mM were most effective. It can be concluded that pre-harvest spraying of seedless barberry shrub with salicylic acid and calcium chloride can improve the quality of fruit as well as extend the storage life. This is because a foliar application with salicylic acid and calcium chloride significantly affected fresh fruit weight, weight loss, fruit volume, electrolyte leakage, pH, TSS, TA and ascorbic acid in treated fruit compared to the control. Salicylic acid at 3 mM significantly decreased electrolyte leakage, which can be used as a useful tool for increasing resistance to chilling injury during long-term storage. However, further studies are needed as the effect of chemical sprays on fruit quality and quantity properties depend on different factors such as tree age and types, environmental conditions during and after the spray and also chemical concentration.

In this research, the effect of chitosan, nano-chitosan, methylcellulose, and pectin on maintenance of bioactive compounds and storability of pomegranate aril cv. Rabbab-e-Neyriz were studied during storage time. Arils were treated with 1.5% chitosan, 3% methylcellulose, 3% pectin and pure nano-chitosan (100%) solutions and then stored at 5 °C for 16 days and sampling of stored arils was done at 4 days intervals. After 16 days of storage at 5 °C, fungal contamination was observed in all samples except for those treated with 1.5% chitosan. The most and the least weight loss in arils obtained in the control and those treated with 1.5% chitosan, respectively. The edible coatings especially chitosan significantly prevented from degradation of anthocyanin and ascorbic acid. Total phenoland antioxidant activity of juice decreased during storage; however chitosan coating significantly led tomaintain these bioactive compounds. Edible coating treatments and especially chitosan maintained the TSS, TA, flavor index in comparison with control. Overall, chitosan effectively reduced water loss, aril losses and maintained bioactive compounds during storage.

Asaclimactericfruit, peach has a highrespiration rateandvery lowshelf life. Nowadays theuse ofappropriatepostharvesttechnologiesto increase fruit postharvest lifeis necessary.Use of nanotechnologyis considered asan effective method to increase fruit postharvest life. Nanotechnology isused extensivelyinallstages of production, processing, storage, packagingand transport ofagriculturalproducts.The objective of this study was to investigate the effect of silver and silica nanocomposites, nanosilver and polypropylene containers on shelf-life and preservation of peach qualitative characteristics (Prunuspersicacv. Elberta) such as titrable acidity, soluble solids, ascorbic acid, total antioxidant and total phenolics content in cold storage after the harvest.
To determine the effect of nanopackaging onshelf life andqualitativecharacteristics ofElberta peaches,the experiment was conducted in a factorial based on a completely randomized design with two treatmentsand four replications.The first factor consisted of nanopackagingnanosilver, silver and silica nanocompositesandpolypropylenepackaging, and the second factor was coldstorage periods of15, 30 and 45 daysattemperaturesfrom 0 to0/5 °C and a relative humidityof 85to 95%.In general, the experiment consisted of 36 experimental units, and each includinga container with four Elberta peach fruits.Data were analyzed by using SAS software, and Microsoft Office Excel 2010 software was used to plot the graphs.Duncan's multiple range test was used to compare the means of treatments.
At the end of the maintenance period, the highest firmness of peach texture was related to nanosilver containers. The main cause of fruit softening is the destruction of cell wall components, especially pectin, which is caused by certain enzymes such as polygalactronase. Whenstorage timeincreased, polypropylene containers showed a higher weight loss compared to nanocomposite containers, thus the results indicated that nanopackaging had a greater effect on preventing weight loss, which could be attributed to the formation of better barrier against water molecules. Nanoparticles and polypropylene containers up to 30-daystorage period preserved the pH of the product to some extent and prevented it from increasing too much. However, with an increase in storage time from 30 to 45 days, the pH of all dishes showed sharpincrease. In most treatments, fruits grew during the maintenance period, which is due to the reduction of organic acids. The lowest levels of organic acids reduction were recorded in polypropylene and nanosilver treatments. Generally, organic acids decreased as a result of respiration or becoming sugars, whichcan bedirectly related to metabolic activity. Maintaining organic acids in fruits is the result of a slowdown in the processes of ripeningand aging and reduction inrespiration and other metabolic activities. The results showed that in all the three treatments, the amount of soluble solids up to 15-day periodshowed an increasing trend, and after the end of day 30, it stopped in nanosilver and polypropylene treatments, and soluble solids were retained but reduced in nanocomposite treatment showed that this decrease. Nanocomposite containers exhibited the best performance in maintaining ascorbic acid content and preventing its changes, while ascorbic acid content in nanosilver and polypropylene containers varied greatly, thoughthere were no significant differences among thetreatments. Low oxygen environments, such as packaging containers, can inhibit ascorbic acid changes during maintenance by inhibiting oxidation. The results showed that total antioxidant level was almost identical in all treatments at the end of maintenance. Antioxidant activity has a close relationship with phenolic compounds, flavonoids and vitamins. The antioxidant capacity of fruits and vegetables is related to enzymatic and non-enzymatic compounds such as vitamin C, phenolic compounds, and carotenoids. Treatments reducingrespiration and producingethylene can reduce the rate of aging,the rate of free radical production and the consumption of antioxidants. Based on the results, on the day 30 in all treatments, the amount of phenolic compounds initiallyincreased, which is normal in red fruits, but afterwards decreased in all treatments mainly due to the increased activity of the polyphenol oxidase enzyme and the progression of aging. Increasing the amount of phenol on the day 30 can be attributed to decreased activity of the polyphenol oxidase enzyme and the oxidative stress associated with high concentrations of oxygen.
Nanopackaging increased the shelf life and qualitative properties of peach fruit. Nanotechnology has a simple and fast process for industrialization compared to other methods of keeping food products. As a result, the use of modern technologies such as nanopackaging can improve the taste, favor, quality of food and the storage of crops, especially fruits and vegetables.

The present study was aimed to study the effects of storing temperature (0 and 5°C) and packaging type (cellophane and plastic containers with air-gated) on storage life of watercress (Nasturtium officinal L.) leaves during 14 days storing. Changes in ascorbic acid, total phenolics, flavonoids and sugar content as well as antioxidant capacity were traced in this experiment. Storing resulted in a significant decrease in flavonoid content of watercress leaves and its level decreased from 46.4mg/g of dry weight to 36.2mg/g. Similarly, during 7 and 14 days storing, the ascorbic acid content of leaves significantly decreased from 68.1mg/100g of fresh weight to 63.5 and 55.1mg/100g of fresh weight, respectively. In the case of antioxidant capacity, the effects of storing time and packaging type were significant (p<0.01). During storage, total phenolics were significantly increased from 11.6 mg/g of fresh weight to 13.6 mg/g of fresh weight. In contrast, the effects of storing temperature and type of packaging on phenolic compounds were not significant. The leaves stored in air-gated containers had the higher water content and, in consequence, the better quality than that of those stored in cellophane containers. It can be concluded that the leaves stored in aerated containers and 0°C had the better quality due to the lower respiration.

In order to study the effects of seed priming with ascorbic acid (AsA) on agronomic traits of two soybean cultivars under normal irrigation and interrupted irrigation at flowering stage, this experiment was carried out in a split-plot factorial arrangement with randomized complete block design in three replications at the research farm of agriculture faculty, Islamic Azad University, Sanandaj Branch in 2013. The main factor was irrigation with two levels of full irrigation and interrupted irrigation at flowering stage. The factorial combination of cultivar and seed priming with AsA was assigned in sub-plots. Two soybean cultivars included Hobbit and L17 and seed priming treatments included: 0 (Control or non-priming), 50, 100 and 150 mg/L AsA. Results showed that two soybean cultivars differently responded to seed priming with AsA under full irrigation and interrupted irrigation (drought stress). Hobbit cultivar positively responded to priming under stress conditions. AsA application in seed priming resulted in increasing of seed yield and seed oil yield in comparison with control (non-priming), whereas L17 cultivar had no response to seed priming in stress conditions. On the other hand in normal irrigation conditions two cultivars showed a reverse reaction to seed priming so that L17 cultivar positively responded to priming under full irrigation conditions especially the concentration of 150 mg/L AsA expressively increased seed yield of this cultivar.

In order to evaluate the effect of different concentrations of postharvest salicylic acid and calcium chloride on shelf life، quality characteristics and antioxidant activity of peach fruit cv. Amesden، an experiment was conducted as factorial based on randomized completely design with three replications. Fruits were harvested at the commercial ripening stage، and fruits were immerged in different concentrations of salicylic acid (1 and 2 mM)، calcium chloride (1. 5 and 3%)، combined salicylic acid and calcium chloride (1-1. 5، 1-3، 2-1. 5 and 2-3)، and distilled water (control) for 5 min، then fruits were packed in boxes with polyethylene cover and stored at 4°C with 80-85% relative humidity for 35 days. The changes in weight loss، fruit firmness، rot percentage; pH، total soluble solids، titratable acidity، ascorbic acid and antioxidant activity were estimated in 0 and 35 days during storage. The results showed that the weight loss، rot percentage، pH and total soluble solids significantly increased، while the fruit firmness، titratable acidity، ascorbic acid and antioxidant activity significantly decreased at the end of storage period. The salicylic acid and calcium chloride treatments significantly reduced the weight loss and maintained their firmness. In this condition، the highest of titratable acidity، ascorbic acid and antioxidant activity were observed in treatments of salicylic acid and calcium chloride، while the lowest of total soluble solids and rot percentage was showed in treatments of salicylic acid and calcium chloride than in the control treatment. Also، combined treatment (salicylic acid + calcium chloride) had an important effect in relative to each treatment separately. The data indicated that the use of salicylic acid and calcium chloride may be introduced as an effective and successful strategy in postharvest technology of the peach.

Chamomile is one of the most important medicinal plants known to Human And due to its increasing use in pharmaceuticals, cosmetics, hygiene, perfumery and flavoring preparation of food isvery important. Soil salinity is one of the main barriers and constraints in the production of agricultural, such as medicinal plants is optimal. Ascorbic acid is a powerful antioxidant compounds that can reduce the effects of salinity on plants. In order to, test in the form of split plot in a randomized complete block design, in the city ofValley City in 1390 with three replications. Test parameters include salinity of Irrigation water, with 3 levels (0, 50 and 100 mM) and ascorbic acid with 3 levels (0, 5 and 10 mM). The results showed that increasing salinity decreased height, biomass, dried flowers and seed yield, but the yield was significantly increased intake of ascorbic acid. Interaction of ascorbic acid and salt on the dried flowers was significant. The most of dried flowers Yield in salinity of 0 mM and 10 mM ascorbic acid, the amount of 1,123 kg per hectare. The results of this study indicate the beneficial effects of ascorbic acid to reduce the harmful effects of salinity on the quantitative Yield of German chamomile herb.

In order to study, non-enzymatic antioxidants level of carotenoid and ascorbic acid in parsley leaves of twenty-one masses were compared between the first and second harvest. Also for evaluation of enzymatic-antioxidant activity, catalase and peroxidase activity in leaves of two twenty-one masses were measured at the end of vegetative growth. In each replication, one gram of fresh mixed leaf tissue of all samples was selected to measure the above mentioned parameters based on standard methods., The data were analyzed in a randomized complete block design by SAS software. Results showed that the highest and lowest levels of carotenoids in the first harvest were7.54 and 2.00 mg/100 g in Bushehr 149 and Lorestan 69 masses, respectively. The maximum and minimum levels of vitamin C in the first harvest were 0.733 and 0.039 mg/100g in Lorestan 153 and western Azarbaijan 51 masses, respectively. The highest and lowest peroxidase activity were found 3.25 and 0.11 micromole of hydrogen peroxide per minute in central mass 46 and control region (native Ahwazi) respectively. The highest and lowest catalase activity were related 0.645 and 0.006 micromole of hydrogen peroxide per minute to Eastern Azerbaijan 62 and Central 45. According to results of this study, Lorestan 153, Lorestan 69, and Hamadan 49 masses could be introduced as the best masses of antioxidant activity.

In order to study the effects of water deficit stress and foliar application of ascorbic acid, an experiment was conducted in research field of Islamic Azad University, Varamin Branch in Iran during 2012 growing season. The experimental design was laid out in a randomized complete block design with a split plots arrangement in three replications. Main plots included four different levels of irrigation (complete irrigation, irrigation withholding at 8-leaf stage, irrigation withholding at grain filling stage and irrigation withholding at both 8-leaf and grain filling stages) and three different concentration of Ascorbic Acid foliar application (0, 100 and 200 ppm) was allocated to subplots. The results showed that irrigation withholding conditions in different growth stages significantly decreased seed yield, biological yield, harvest index, oil and protein percentage, oil and protein yield and total chlorophyll content but by contrast increased proline content and superoxide dismutase activity in leaves. Foliar application of ascorbic acid as antioxidant enzyme could increased quantitative and qualitative yield and chlorophyll content and decreased proline and superoxide dismutase activity in leaves by reduction of water deficit stress. Foliar application of Ascorbic Acid with 200 ppm under irrigation withholding at both 8-leaf and grain filling stages increased 38/46% yield seed compared with treatment that foliar application without Ascorbic Acid. In addition, Ascorbic Acid foliar application reduced the harmful effects of water deficit stress as antioxidant and improved growth conditions for water deficit stress.

In order to investigation the effect of salicylic acid and temperature treatments onphysic-chemical attributes and antioxidant activity was conducted of apricot cultivar ‘Lasgerdi’the experiment. The apricot fruits were harvested at the commercial ripening stage، and fruits were immerged in different concentration of salicylic acid as well as distilled water (control) for 5 min، then fruits were packed in boxes with polyethylene cover and stored. The changes in fruit weight، firmness، pH، total soluble solid content، titratable acidity، ascorbic acid، antioxidant activity were estimated after 0، 5، 10، 15 and 20 days during storage. The results showed that the weight loss، firmness، titratable acidity، ascorbic acid and antioxidant activity decreased significantly while the pH and total soluble solid content increased significantly during storage for two temperatures. During the storage period، a significant difference between treatments (control and various concentrations differences of salicylic acid) and various temperature significantly the weight loss and maintained their firmness. In this condition، the highest and lowest of titratable acidity، ascorbic acid and antioxidant activity were observed in treatments of 4 mM salicylic acid and control، respectively. Also، the data showed that the temperature of 4°c positive impact maintained quality and fruit shelf life during storage. Based on our results، the salicylic acid treatment as combination nature and temperature of 4°c may be used commercially to extend the storage life of apricot.

The limited postharvest storage life of apricot causes the goal of presenting a solution in this manuscript to improve the postharvest storage of studied apricot cultivars. Studying the effect of different concentration of pre-harvest salicylic acid on quality attributes and antioxidant activity of apricot during storage is the approach in used. The apricot cultivar(Nori) were sprayed at the 3 weeks before commercial ripening stage, with 1, 2, 3 and 4 mM salicylic acid as well as distilled water (control). At commercial ripening stage, apricot fruit were harvested and immediately transported to the laboratory, and then fruits were packed in boxes with polyethylene cover and stored at 4°C and 95% relative humidity for 20 days. The changes in weight loss, fruit firmness, total soluble solids, titratable acidity, pH, ascorbic acid, total phenolics and antioxidant activity were estimated after 0, 5, 10, 15 and 20 days during storage. The results showed that the weight loss, total soluble solids, pH increased significantly while the fruit firmness, titratable acidity, ascorbic acid, total phenolics and antioxidant activity decreased significantly during storage for both cultivars. During this stage, a significant difference between control and salicylic acid treatments in all measured parameters is observed. The salicylic acid treatments reduced significantly the weight loss and maintained their firmness. In this condition, the highest and lowest of titratable acidity, ascorbic acid, total phenolics and antioxidant activity were observed in treatments of 4 mM salicylic acid and control, respectively. The data revealed that the quality of apricot fruits was improved by the use of salicylic acid treatment due to its effect on delaying the ripening processes.

In this study, the physicochemical quality and antioxidant activities of fruits peel from 6 citrus varieties which commonly consumed in the North of Iran were determined. Some parameters were measurement such fruit size, peel thickness, residue percentage, peel color indices, total phenolics, total flavonoid, total anthocyanins, total carotenoids, total chlorophyll, ascorbic acid content and antioxidant capacity by DPPH● assay and ABTS +● scavenging activity. Results showed that there were a positive relationship between fruit size, peel thickness and residue percentage. Thamson variety was largest among all varieties. Generally, all varieties had standard peel color at harvesting time. The total content of phenolic was superior in peel of ‘Siavaraz’ (0.49 mg/ml) and ‘Page’ (0.43 mg/g) varieties. The peel of ‘Moro’ with 7.68 mg/g and 13.29 mg/l had highest total flavonoid and anthocyanin respectively. The highest of total carotenoid and chlorophyll accumulation with 0.84 and 3.5 mg/ml were observed in ‘Tarocco’. Perfectly, peel carotenoid concentration ranged from 0.12 to 0.84 and also from 0.87 to 3.5 mg/g to total chlorophyll. The quantity of ascorbic acid content ranged from 18.17 (Siavaraz) to 23.56 mg/100g FW (Thamson). Also, results showed ‘Sanguinello’ peel had the lowest IC50 values (0.2 mg) of DPPH radical scavenging activities. Base of AE results, significant differences only observed between ‘Sanguinello’ and other varieties. According to the ABTS assay, the antioxidant activity was at least 68.58% in ‘page’ variety. Finally, this peel of citrus varieties possessed relatively high antioxidant activity and might be rich sources of natural antioxidants.