ﺗﻌﯿﯿﻦ ﺧﻮاص رﺋﻮﻟﻮژﯾﮑﯽ ﮔﻮﺟﻪﻓﺮﻧﮕﯽ (lycopersiconescolentum mill) ﺑﺎ اﺳﺘﻔﺎده از آزﻣﻮن ﺧﺰش

Determination of Rheological Properties of Tomato Using Creep Test

در ﺗﺤﻘﯿﻖ ﺣﺎﺿﺮ ﺧﻮاص رﺋﻮﻟﻮژﯾﮑﯽ دو رﻗﻢ ﻣﯿﻮه ﮔﻮﺟﻪﻓﺮﻧﮕﯽ ارﮔﻮن و ﺷﻘﺎﯾﻖ ﺑﺎ اﻧﺠﺎم آزﻣﺎﯾﺶ ﺧﺰش- ﺑﺎزﮔﺸﺖ ﻣﻄﺎﻟﻌﻪ ﺷﺪ. ﺟﻬﺖ ﺑﺮرﺳﯽ ﺗﺄﺛﯿﺮ رﻗﻢ و زﻣﺎن ﻧﮕﻬﺪاري ﺑﺮ ﺧﻮاص رﺋﻮﻟﻮژﯾﮑﯽ ﺑﺪﺳﺖ آﻣﺪه، از آزﻣﻮن ﻓﺎﮐﺘﻮرﯾﻞ در ﻗﺎﻟﺐ ﻃﺮح ﮐﺎﻣﻼً ﺗﺼﺎدﻓﯽ اﺳﺘﻔﺎده ﮔﺮدﯾﺪ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن دادﻧﺪ ﮐﻪ ﻣﺪل ﭼﻬﺎر اﻟﻤﺎﻧﻪ ﺑﺮﮔﺮ ﻣﻨﺎﺳﺐﺗﺮﯾﻦ ﻣﺪل ﺑﺮاي ﺑﯿﺎن ﻣﺸﺨﺼﺎت وﯾﺴﮑﻮاﻻﺳﺘﯿﮏ ﮔﻮﺟﻪﻓﺮﻧﮕﯽ در آزﻣﻮن ﺧﺰش ﻣﯽﺑﺎﺷﺪ. اﺛﺮ رﻗﻢ در ﺳﻄﺢ اﺣﺘﻤﺎل ﯾﮏ درﺻﺪ ﺑﺮ ﻣﺪول اﻻﺳﺘﯿﺴﯿﺘﻪ، ﺿﺮﯾﺐ وﯾﺴﮑﻮزﯾﺘﻪ و زﻣﺎن ﺗﺄﺧﯿﺮ ﻣﻌﻨﯽدار و ﻣﻘﺪار اﯾﻦ ﭘﺎراﻣﺘﺮﻫﺎ ﺑﺮاي رﻗﻢ ﺷﻘﺎﯾﻖ ﺑﺰرگﺗﺮ از رﻗﻢ ارﮔﻮن ﺑﻮد. ﻫﻤﭽﻨﯿﻦ ﺑﺎ اﻓﺰاﯾﺶ ﻣﺪت زﻣﺎن ﻧﮕﻬﺪاري، ﻣﺪول اﻻﺳﺘﯿﺴﯿﺘﻪ، وﯾﺴﮑﻮزﯾﺘﻪ و زﻣﺎن ﺗﺄﺧﯿﺮ ﮐﺎﻫﺶ ﯾﺎﻓﺘﻨﺪ؛ ﮐﺎﻫﺶ آﻧﻬﺎ در ﺳﻄﺢ اﺣﺘﻤﺎل ﯾﮏ درﺻﺪ ﻣﻌﻨﯽدار ﺑﻮد.

In the present work, the rheological properties of two varieties of tomatoes were studied under creep recovery test. A factorial experiment in the form of completely randomized design was used to determine the effects of storage time and variety on the viscoelastic properties. The results showed that 4-elements model (Burgers model) can explain the rheological behavior of the products with highest determination coefficients. The variety had a significant effect on the coefficients of elasticity, viscosity and retardation times at 1% level of probability. The values for the mentioned parameters in Shaghayegh cultivar was greater compared to that of Ergon cultivar. Also, the elastic modulus values increased with increasing storage time, where the values for the coefficients of viscosity and retardation times reduced at the same time