بررسي اثر پوشش خوراكي كامپوزيتي پروتئين تغليظ شده شير- پكتين تقويت شده با كلسيم كلريد و اسانس سياه دانه بر ويژگي‌هاي فيزيكو شيميايي، آنتي‌اكسيداني و ميكروبي توت‌‌فرنگي طى انبارمانى

The Effect of Milk-Pectin Protein Concentrate Composite Edible Coating Reinforced by Calcium Chloride and Nigella Sativa L. Essential Oil on the Physicochemical, Antioxidant and Microbial Characteristics of Strawberries During Storage

ﻫﺪف از اﯾﻦ ﻣﻄﺎﻟﻌﻪ اﻓﺰاﯾﺶ ﻣﺎﻧﺪﮔﺎري و ﺣﻔﻆ ﮐﯿﻔﯿﺖ ﻣﯿﻮه ﺗـﻮت ﻓﺮﻧﮕـﯽ ﺑـﺎ اﺳـﺘﻔﺎده از ﭘﻮﺷـﺶ ﺧـﻮراﮐﯽ ﮐـﺎﻣﭙﻮزﯾﺘﯽ ﭘـﺮوﺗﺌﯿﻦ ﺗﻐﻠـﯿﻆ ﺷـﺪه ﺷﯿﺮ- ﭘﮑﺘﯿﻦ ﺗﻘﻮﯾﺖ ﺷﺪه ﺑﺎ ﮐﻠﺴﯿﻢ ﮐﻠﺮﯾﺪ و اﺳﺎﻧﺲ ﺳﯿﺎهداﻧﻪ ﻃﯽ زﻣﺎن 10 روز اﻧﺒﺎرﻣﺎﻧﯽ در دﻣﺎي 4±1 درﺟـﻪ ﺳﻠﺴـﯿﻮس ﺑـﻮد. ﺗـ ﺄﺛﯿﺮ ﭘﻮﺷـﺶ ﺧﻮراﮐﯽ ﺑﺮ ﭘﺎﯾﻪ ﭘﺮوﺗﺌﯿﻦ ﺗﻐﻠﯿﻆ ﺷﺪه ﺷﯿﺮ )6/4 و 8%(، ﭘﮑﺘﯿﻦ )0/ 2 و 4%(، ﮐﻠﺴﯿﻢ ﮐﻠﺮﯾﺪ )1/ 2 و 3%(، ﮔﻠﯿﺴﺮول )2/ 3 و 4%( و اﺳﺎﻧﺲ ﺳـﯿﺎه داﻧﻪ )2%( ﺑﺮرﺳﯽ ﺷﺪ. ﭘﺲ از ﺑﻬﯿﻨﻪﺳﺎزي ﮐﯿﻔﯿﺖ ﻣﯿﮑﺮوﺑﯽ، ﺧﺼﻮﺻﯿﺎت ﻓﯿﺰﯾﮑﻮ ﺷﯿﻤﯿﺎﯾﯽ، آﻧﺘﯽ اﮐﺴﯿﺪاﻧﯽ، ﻣﺤﺘﻮاي آﻧﺘﻮﺳﯿﺎﻧﯿﻦ و ﺳـﻔﺘ ﯽ ﺑﺎﻓـﺖ ﺗﻮتﻓﺮﻧﮕﯽﻫﺎي ﭘﻮﺷﺶ داده ﺷﺪه، در روزﻫﺎي 5 و 10 ﭘﺲ از اﻧﺒﺎرﻣﺎﻧﯽ ﺑﺎ ﻧﻤﻮﻧﻪﻫﺎي ﮐﻨﺘﺮل ﻣﻘﺎﯾﺴﻪ ﺷﺪﻧﺪ. ﺗﻤﺎم وﯾﮋﮔﯽﻫﺎي ﮐﯿﻔﯽ ﻣﻮرد ﻣﻄﺎﻟﻌـﻪ در ﻧﻤﻮﻧﻪ ﭘﻮﺷﺶ داده ﺷﺪه ﺑﺎ ﻧﻤﻮﻧﻪﻫﺎي ﮐﻨﺘﺮل ﺗﻔﺎوت ﻣﻌﻨﯽ دار داﺷﺖ )0/05

The aim of this study is to increase the shelf life and quality of strawberries, using a composite coating of concentrated milk protein-pectin reinforced with calcium chloride and Nigella sativa L. essential oil during 10 days of storage at 4±1°C. The effect of edible coating based on condensed milk protein (4, 6 and 8%), pectin (0, 2 and 4%), calcium chloride (1, 2 and 3%), glycerol (2, 3 and 4%) and Nigella sativa L. essential oil (2%) is investigated. After optimizing the microbial quality of coated strawberries, their physicochemical properties, antioxidant activity, anthocyanin content, and tissue hardness were compared with the control samples at 5 and 10 days after storage. All the studied qualitative characteristics of the coated samples were significantly different from the control samples (p <0.05). The results showed that this edible coating maintains the quality of strawberries in comparison to the uncoated control samples due to rot reduction.