Browsing by Author "Islam, Ali"

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Changes in Quality Traits and Phytochemical Components of Blueberry (Vaccinium Corymbosum Cv. Bluecrop) Fruit in Response To Postharvest Aloe Vera Treatment
(Taylor & Francis inc, 2022) Ates, Umut; Islam, Ali; Ozturk, Burhan; Aglar, Erdal; Karakaya, Orhan; Gun, Sefa
The effect of Aloe vera application (33% and 66% as dipping, AV) on 'Bluecrop' blueberry's (Vaccinium corymbosum) quality properties such as weight loss, respiration rate, fruit color, soluble solids content (SSC), acidity, phytochemical components (vitamin C, total phenolics, and total flavonoids) and antioxidant activity was investigated during the cold storage (at 0 +/- 0.5 degrees C and 90 +/- 5% RH) for 28 days. During cold storage, significantly lower weight loss was recorded in fruit treated with AV compared to control. At the end of the cold storage, the weight loss was 20% lower in AV treated fruits and AV concentration was not effective in weight loss. On the contrary, the respiration rate (except for the 7th day) and fruit firmness were higher in these fruit. It was observed that color changes were less in AV-treated fruit during storage. In general, AV-treated fruit had significantly lower SSC, while acidity and vitamin C were higher. Moreover, 66% AV application was more effective in delaying the loss of vitamin C at the end of storage. During cold storage, 33% AV-treated fruit had significantly higher total phenolics (except day 28) and total flavonoids content compared to control. In the last two measurements of the cold storage, it was determined that fruit dipped in AV had higher antioxidant activity (both DPPH and FRAP assays) compared to control fruit. As a result, it was revealed that postharvest AV gel applications can be used as an effective postharvest tool to delay the loss of quality, the loss of phytochemical components and antioxidant activity of the blueberry fruit.
Combined Effects of Aloe Vera Gel and Modified Atmosphere Packaging Treatments on Fruit Quality Traits and Bioactive Compounds of Jujube (Ziziphus Jujuba Mill.) Fruit During Cold Storage and Shelf Life
(Elsevier, 2022) Islam, Ali; Acikalin, Raziye; Ozturk, Burhan; Aglar, Erdal; Kaiser, Clive
This study assessed Aloe vera gel (AV) and modified atmosphere packaging (MAP) treatments on weight loss, respiration rate, color, firmness, soluble solids content (SSC), titratable acidity, vitamin C, phenol, flavonoids and antioxidant activity of jujube (Ziziphus jujuba Mill. cv. 'Li') fruit during cold storage and shelf life. Fruit were stored at 0 +/- 0.5 degrees C and 90 +/- 5 % relative humidity (RH) for 35 d followed by 21 +/- 1.0 degrees C and 65 +/- 5 % to simulate shelf life for 4 d. During cold storage, weight loss and respiration rate were delayed by MAP. At the end of cold storage, higher firmness and acidity were measured in fruit treated with MAP compared to control. Also, L*, hue angle, vitamin C, total phenolics, and the antioxidant activity of jujube fruit treated with both AV and MAP were higher than control. However, lower chroma and SSC in fruit treated with MAP were determined. During shelf life storage, higher firmness, L*, hue angle and acidity in fruit treated with MAP were obtained compared to control and AV treatments, whereas lower chroma and SSC were observed. On the last day of shelf life measurement (35 + 4 d), vitamin C, total phenolics, total flavonoids and antioxidant activity (DPPH and FRAP assays) of fruit treated with both AV and MAP was higher than control. In conclusion, it was revealed that AV and MAP treatments could be an effective tool for retarding the losses that occurred in the fruit quality of jujube during cold storage and shelf life. The effect of MAP treatment in maintaining fruit quality was more pronounced.
Effects of Aloe Vera Gel and Modified Atmosphere Packaging Treatments on Quality Properties and Bioactive Compounds of Plum (Prunus Salicina L.) Fruit Throughout Cold Storage and Shelf Life
(Springer, 2023) Avci, Vedat; Islam, Ali; Ozturk, Burhan; Aglar, Erdal
This study assessed the effects of modified atmosphere packaging (MAP) and Aloe vera gel (AV) treatments on fruit quality and bioactive compounds of plum (Prunus salicina L. cv. 'Black Amber') during cold storage and shelf life. The fruit were stored at 0 +/- 0.5 degrees C and 90 +/- 5% relative humidity (RH) for 35 days followed by 21 +/- 1.0 degrees C and 65 +/- 5% to simulate shelf life for 4 days. The lowest weight loss occurred in fruit treated with MAP during cold storage. The respiration rate was lower with MAP. However, the respiration rate was higher in AV-treated fruit. The MAP treatment maintained fruit firmness, but AV treatment had a negative effect. The AV and MAP treatments did not affect chroma or hue angle color values during cold storage but did influence shelf life. The MAP and AV treatments generally did not affect soluble solids content, but they affected titratable acidity. Vitamin C decreased with the extension of cold storage. However, vitamin C was maintained by MAP and AV treatments, with MAP being the most effective treatment. The MAP and AV treatments did not affect antioxidant activity during cold storage. As a result, MAP treatments positively affected the maintenance of quality characteristics and biochemical content by delaying the maturity of plum fruits during cold storage.