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Acid Ratio

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Ian Cameron – One of the best experts on this subject based on the ideXlab platform.

  • Brix/Acid Ratio as a Predictor of Consumer Acceptability of Crimson Seedless Table Grapes
    Journal of Food Quality, 2008
    Co-Authors: Vijay Jayasena, Ian Cameron
    Abstract:

    ABSTRACT Harvesting at correct time is essential for the supply of quality grapes. There is no standard method to determine the proper time of harvesting for table grapes. The applicability of objective measurements such as soluble solids concentRation (°Brix), Acid contents (titratable Acidity) and °Brix/Acid Ratio of Crimson Seedless table grapes were evaluated as predictors of quality in terms of consumer acceptability. Crimson Seedless table grapes were harvested from two locations in Western Australia at weekly intervals for 5 weeks. The samples were density sorted to get berries of different maturity levels. Objective measurements and sensory evaluation (panel of 63 judges) were conducted. There were significant (P ≤ 0.05) differences in the degree of liking among grapes of 16.0–17.0, 17.1–18.0 and 19.1–20.0°Brix. Consumer liking of grapes substantially changed with a change in Acidity. The data revealed correlation coefficients of determination (r2) of 0.58, 0.79 and 0.85 between overall consumer acceptability and °Brix, Acidity, and °Brix/Acid Ratio, respectively. °Brix/Acid Ratio was found to be the best objective measurement that reflected the consumer acceptability and can be used as a reliable tool to determine the optimum harvesting stage of Crimson Seedless table grapes. PRACTICAL APPLICATIONS Crimson Seedless table grapes have been successfully grown in Australia since 1994, and they are gaining popularity with consumers day by day. However, means of determining proper time to harvest has not yet been established. This study, by examining the relationship between instrumental measurements and human perception of sensory characteristics of Crimson Seedless table grapes, will provide a simple but reliable instrumental method to predict the optimum harvest stage of Crimson Seedless table grapes. This will help in providing a quality product to the consumers while helping growers to get better return out of their produce.

  • brix Acid Ratio as a predictor of consumer acceptability of crimson seedless table grapes
    Journal of Food Quality, 2008
    Co-Authors: Vijay Jayasena, Ian Cameron
    Abstract:

    ABSTRACT Harvesting at correct time is essential for the supply of quality grapes. There is no standard method to determine the proper time of harvesting for table grapes. The applicability of objective measurements such as soluble solids concentRation (°Brix), Acid contents (titratable Acidity) and °Brix/Acid Ratio of Crimson Seedless table grapes were evaluated as predictors of quality in terms of consumer acceptability. Crimson Seedless table grapes were harvested from two locations in Western Australia at weekly intervals for 5 weeks. The samples were density sorted to get berries of different maturity levels. Objective measurements and sensory evaluation (panel of 63 judges) were conducted. There were significant (P ≤ 0.05) differences in the degree of liking among grapes of 16.0–17.0, 17.1–18.0 and 19.1–20.0°Brix. Consumer liking of grapes substantially changed with a change in Acidity. The data revealed correlation coefficients of determination (r2) of 0.58, 0.79 and 0.85 between overall consumer acceptability and °Brix, Acidity, and °Brix/Acid Ratio, respectively. °Brix/Acid Ratio was found to be the best objective measurement that reflected the consumer acceptability and can be used as a reliable tool to determine the optimum harvesting stage of Crimson Seedless table grapes. PRACTICAL APPLICATIONS Crimson Seedless table grapes have been successfully grown in Australia since 1994, and they are gaining popularity with consumers day by day. However, means of determining proper time to harvest has not yet been established. This study, by examining the relationship between instrumental measurements and human perception of sensory characteristics of Crimson Seedless table grapes, will provide a simple but reliable instrumental method to predict the optimum harvest stage of Crimson Seedless table grapes. This will help in providing a quality product to the consumers while helping growers to get better return out of their produce.

Vijay Jayasena – One of the best experts on this subject based on the ideXlab platform.

  • Brix/Acid Ratio as a Predictor of Consumer Acceptability of Crimson Seedless Table Grapes
    Journal of Food Quality, 2008
    Co-Authors: Vijay Jayasena, Ian Cameron
    Abstract:

    ABSTRACT Harvesting at correct time is essential for the supply of quality grapes. There is no standard method to determine the proper time of harvesting for table grapes. The applicability of objective measurements such as soluble solids concentRation (°Brix), Acid contents (titratable Acidity) and °Brix/Acid Ratio of Crimson Seedless table grapes were evaluated as predictors of quality in terms of consumer acceptability. Crimson Seedless table grapes were harvested from two locations in Western Australia at weekly intervals for 5 weeks. The samples were density sorted to get berries of different maturity levels. Objective measurements and sensory evaluation (panel of 63 judges) were conducted. There were significant (P ≤ 0.05) differences in the degree of liking among grapes of 16.0–17.0, 17.1–18.0 and 19.1–20.0°Brix. Consumer liking of grapes substantially changed with a change in Acidity. The data revealed correlation coefficients of determination (r2) of 0.58, 0.79 and 0.85 between overall consumer acceptability and °Brix, Acidity, and °Brix/Acid Ratio, respectively. °Brix/Acid Ratio was found to be the best objective measurement that reflected the consumer acceptability and can be used as a reliable tool to determine the optimum harvesting stage of Crimson Seedless table grapes. PRACTICAL APPLICATIONS Crimson Seedless table grapes have been successfully grown in Australia since 1994, and they are gaining popularity with consumers day by day. However, means of determining proper time to harvest has not yet been established. This study, by examining the relationship between instrumental measurements and human perception of sensory characteristics of Crimson Seedless table grapes, will provide a simple but reliable instrumental method to predict the optimum harvest stage of Crimson Seedless table grapes. This will help in providing a quality product to the consumers while helping growers to get better return out of their produce.

  • brix Acid Ratio as a predictor of consumer acceptability of crimson seedless table grapes
    Journal of Food Quality, 2008
    Co-Authors: Vijay Jayasena, Ian Cameron
    Abstract:

    ABSTRACT Harvesting at correct time is essential for the supply of quality grapes. There is no standard method to determine the proper time of harvesting for table grapes. The applicability of objective measurements such as soluble solids concentRation (°Brix), Acid contents (titratable Acidity) and °Brix/Acid Ratio of Crimson Seedless table grapes were evaluated as predictors of quality in terms of consumer acceptability. Crimson Seedless table grapes were harvested from two locations in Western Australia at weekly intervals for 5 weeks. The samples were density sorted to get berries of different maturity levels. Objective measurements and sensory evaluation (panel of 63 judges) were conducted. There were significant (P ≤ 0.05) differences in the degree of liking among grapes of 16.0–17.0, 17.1–18.0 and 19.1–20.0°Brix. Consumer liking of grapes substantially changed with a change in Acidity. The data revealed correlation coefficients of determination (r2) of 0.58, 0.79 and 0.85 between overall consumer acceptability and °Brix, Acidity, and °Brix/Acid Ratio, respectively. °Brix/Acid Ratio was found to be the best objective measurement that reflected the consumer acceptability and can be used as a reliable tool to determine the optimum harvesting stage of Crimson Seedless table grapes. PRACTICAL APPLICATIONS Crimson Seedless table grapes have been successfully grown in Australia since 1994, and they are gaining popularity with consumers day by day. However, means of determining proper time to harvest has not yet been established. This study, by examining the relationship between instrumental measurements and human perception of sensory characteristics of Crimson Seedless table grapes, will provide a simple but reliable instrumental method to predict the optimum harvest stage of Crimson Seedless table grapes. This will help in providing a quality product to the consumers while helping growers to get better return out of their produce.

Limin Zhang – One of the best experts on this subject based on the ideXlab platform.

  • estimation of optimum docosahexaenoic to eicosapentaenoic Acid Ratio dha epa for juvenile starry flounder platichthys stellatus
    Aquaculture, 2014
    Co-Authors: Jiying Wang, Derui Zhang, Jianzhen Sun, Yongzhi Sun, Tiantian Hao, Limin Zhang
    Abstract:

    An 8-week feeding experiment was conducted to estimate the optimum docosahexaenoic to eicosapentaenoic Acid Ratio (DHA/EPA) for juvenile starry flounder, Platichthys stellatus, by investigating fish growth performance, fatty Acid composition, lipid metabolism and serological indices. Five isonitrogenous and isoenergetic diets were formulated with graded Ratios of DHA/EPA (0.64, R0.64; 0.97, R0.97; 1.18, R1.18; 1.59 R1.59; 1.91, R1.91) and the total amount of n-3 highly unsaturated fatty Acids (n-3 HUFA) was approximately fixed at 0.73% of the dry weight. Each diet was randomly allocated into triplicate groups of fish in 15 cylindrical tanks (Φ80 cm, 40 cm depth), and each tank was stocked with 20 fish (average initial weight, 31.70 ± 0.12 g). Fish were hand-fed twice a day (8:30 am and 4:30 pm) to visual satiation. Results showed that weight gain rates (WGR) were increased by increasing dietary DHA/EPA from 0.97 to 1.59 (P   0.05), while malate dehydrogenase (MDH) was linearly decreased by increasing dietary DHA/EPA (P < 0.05; R2 = 0.8736). Lipoprotein lipase (LPL) was increased 1–2-fold by increasing dietary DHA/EPA from 0.97 to 1.18 and 1.59 to 1.91 respectively compared to group R0.64 (P < 0.05), whereas hepatic lipase (HL) in fish fed diets with DHA/EPA that ranged from 1.18 to 1.91 were about 2.4 times higher than those in group R0.64 and R0.97. Hormone-sensitive lipase (HSL) in group R1.18 was obviously elevated to the highest value by increasing DHA/EPA from 0.64 to 1.18 and then stabilized, no significance appeared among all groups except group R0.64 and R1.18. Non-specific immunological parameters of total protein (TP), albumin (ALB) and globulin (GLB) were clearly increased by dietary DHA/EPA of 1.59, while the highest lysozyme (LSZ) activity appeared at the Ratio of 1.18. Alanine aminotransferase (ALT) was sharply increased by dietary DHA/EPA of 1.91 (P < 0.05), while remained stable in fish fed diets with lower DHA/EPA. However, aspertate aminotransferase (AST) was remarkably elevated by dietary DHA/EPA higher than 1.18 (P < 0.05). Therefore, considering comprehensively from both fish growth performance and liver functions, the suitable DHA/EPA for juvenile starry flounder should be 1.18 in current study. Besides, our study also indicated that dietary DHA/EPA may regulate lipid deposition in juvenile starry flounder by improving lipogenesis and interfering lypolysis synchronously.

  • Estimation of optimum docosahexaenoic to eicosapentaenoic Acid Ratio (DHA/EPA) for juvenile starry flounder, Platichthys stellatus
    Aquaculture, 2014
    Co-Authors: Jiying Wang, Derui Zhang, Hao Tiantian, Jianzhen Sun, Yongzhi Sun, Limin Zhang
    Abstract:

    An 8-week feeding experiment was conducted to estimate the optimum docosahexaenoic to eicosapentaenoic Acid Ratio (DHA/EPA) for juvenile starry flounder, Platichthys stellatus, by investigating fish growth performance, fatty Acid composition, lipid metabolism and serological indices. Five isonitrogenous and isoenergetic diets were formulated with graded Ratios of DHA/EPA (0.64, R0.64; 0.97, R0.97; 1.18, R1.18; 1.59 R1.59; 1.91, R1.91) and the total amount of n-3 highly unsaturated fatty Acids (n-3 HUFA) was approximately fixed at 0.73% of the dry weight. Each diet was randomly allocated into triplicate groups of fish in 15 cylindrical tanks (Φ80 cm, 40 cm depth), and each tank was stocked with 20 fish (average initial weight, 31.70 ± 0.12 g). Fish were hand-fed twice a day (8:30 am and 4:30 pm) to visual satiation. Results showed that weight gain rates (WGR) were increased by increasing dietary DHA/EPA from 0.97 to 1.59 (P   0.05), while malate dehydrogenase (MDH) was linearly decreased by increasing dietary DHA/EPA (P