3.2.2. Nine points Hedonic test
Panelists analyzed the four samples, compared them based on different sensory features and rated them on different scores based on the Hedonic scale. The score distribution of the responses of panelists for aroma, taste, color, overall acceptability and all other important sensory attributes have been given in the Table 2 and Figs. 3 and 4. The obtained results establish that the distinctions between the differently processed juices are very clear from a sensory acceptability perspective. Non-treated orange juice (control sample) was rated first and used as the reference, because of its sensory characteristics and reliance to fresh orange. Sensory evaluation of these products showed that ultrasound and ultrasound + UV treated juices were favorable as compared to thermal treatment with respect to color, aroma, flavor, clarity and overall acceptability. Ultrasound treated juice clearly had better scores compared to the heat treated juice. Most panelists could tell a vast difference between juice samples that were treated thermally in comparison to the other samples. Though marginal changes in ultrasound and Ultrasound + UV treated juices were noticed in comparison to the untreated juice, they were far better as compared to thermally treated juice in all the sensory properties tested in this study. This indicates that panelists could not indicate any significant differences between these juices treated based on the use of ultrasound. In fact, most panelists rated the ultrasound and ultrasound + UV treated juice at par with the untreated juice. The Hedonic test showed that there is a greater preference for the fresh and ultrasound treated samples. The difference was however significant in the case of thermally processed juice suggesting that the sensory parameters changed significantly beyond the acceptability range leading to sensory rejection of the product. The sensory evaluation panel easily detected significant changes in all the parameters viz. color, texture, aroma, flavor, overall acceptability of the juice samples studied. The panel preferred in general the untreated juice followed by both ultrasound and ultrasound + UV processed juice in terms of aroma, taste, color etc. and gave both these technologies comparable scores. Sensory and consumer tests indicated that the taste of the products is one of the the main criteria for the overall consumption of the products. Ultrasound processed orange juice had brighter color than thermally processed orange juice thereby indicating that ultrasound has minimal effect on color change during processing in comparison to the heat treatment. The positive effect of ultrasound compared to heating is due to the efficient removal of dissolved oxygen from the juice and it is important to note that the effect would be dependent on the treatment time and ultrasonic intensity. The mouth feel of ultrasound treated samples was considerably better. Taste attributes are the best attributes to understand the consumers’ acceptance to differently processed orange juices and the scores clearly revealed the consumer preference for the ultrasound and UV assisted ultrasound treated juices over the thermally pasteurized juices. UV assisted ultrasound treatment resulted in limited detrimental effects on the sensorial quality of orange juice with no major change in the flavor intensity. The results for the assessment of non-treated juices follow similar profiles as the reference control sample. It can be concluded from the sensory evaluation that ultrasonically treated and pasteurized juices were evaluated with different scores in comparison with the untreated samples. The best accepted among the different treated juices were the ultrasonically treated orange juice. A summary of attributes with significant results (p < 0.05) from ANNOVA for the thermally and non-thermally treated juices have been given in Table 2 and Figs. 3 and 4. The table gives the average attribute scores for each case, the least significant difference of means at a 5% level and probability values. It can be observed from the data given in the Fig. 3 that in the case of ultrasound treated orange juice, entire range of sensory attributes of the product is maintained close to that of control and is significantly better than conventionally treated juice based on thermal treatment.
3.2.2. เก้าจุดทดสอบ HedonicPanelists analyzed the four samples, compared them based on different sensory features and rated them on different scores based on the Hedonic scale. The score distribution of the responses of panelists for aroma, taste, color, overall acceptability and all other important sensory attributes have been given in the Table 2 and Figs. 3 and 4. The obtained results establish that the distinctions between the differently processed juices are very clear from a sensory acceptability perspective. Non-treated orange juice (control sample) was rated first and used as the reference, because of its sensory characteristics and reliance to fresh orange. Sensory evaluation of these products showed that ultrasound and ultrasound + UV treated juices were favorable as compared to thermal treatment with respect to color, aroma, flavor, clarity and overall acceptability. Ultrasound treated juice clearly had better scores compared to the heat treated juice. Most panelists could tell a vast difference between juice samples that were treated thermally in comparison to the other samples. Though marginal changes in ultrasound and Ultrasound + UV treated juices were noticed in comparison to the untreated juice, they were far better as compared to thermally treated juice in all the sensory properties tested in this study. This indicates that panelists could not indicate any significant differences between these juices treated based on the use of ultrasound. In fact, most panelists rated the ultrasound and ultrasound + UV treated juice at par with the untreated juice. The Hedonic test showed that there is a greater preference for the fresh and ultrasound treated samples. The difference was however significant in the case of thermally processed juice suggesting that the sensory parameters changed significantly beyond the acceptability range leading to sensory rejection of the product. The sensory evaluation panel easily detected significant changes in all the parameters viz. color, texture, aroma, flavor, overall acceptability of the juice samples studied. The panel preferred in general the untreated juice followed by both ultrasound and ultrasound + UV processed juice in terms of aroma, taste, color etc. and gave both these technologies comparable scores. Sensory and consumer tests indicated that the taste of the products is one of the the main criteria for the overall consumption of the products. Ultrasound processed orange juice had brighter color than thermally processed orange juice thereby indicating that ultrasound has minimal effect on color change during processing in comparison to the heat treatment. The positive effect of ultrasound compared to heating is due to the efficient removal of dissolved oxygen from the juice and it is important to note that the effect would be dependent on the treatment time and ultrasonic intensity. The mouth feel of ultrasound treated samples was considerably better. Taste attributes are the best attributes to understand the consumers’ acceptance to differently processed orange juices and the scores clearly revealed the consumer preference for the ultrasound and UV assisted ultrasound treated juices over the thermally pasteurized juices. UV assisted ultrasound treatment resulted in limited detrimental effects on the sensorial quality of orange juice with no major change in the flavor intensity. The results for the assessment of non-treated juices follow similar profiles as the reference control sample. It can be concluded from the sensory evaluation that ultrasonically treated and pasteurized juices were evaluated with different scores in comparison with the untreated samples. The best accepted among the different treated juices were the ultrasonically treated orange juice. A summary of attributes with significant results (p < 0.05) from ANNOVA for the thermally and non-thermally treated juices have been given in Table 2 and Figs. 3 and 4. The table gives the average attribute scores for each case, the least significant difference of means at a 5% level and probability values. It can be observed from the data given in the Fig. 3 that in the case of ultrasound treated orange juice, entire range of sensory attributes of the product is maintained close to that of control and is significantly better than conventionally treated juice based on thermal treatment.
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