摘要
'Beauregard', 'Covington', 'Evangeline', 'Hatteras' and 'Carolina Rose' sweetpotato (Ipomoea batatas (L) Lam) roots graded U.S. No. 1 were stored in environmentally controlled rooms for 300 days. All the sweetpotato roots used in this study were grown and stored in eastern North Carolina. The effect of relative humidity on root weight loss was experimentally tested by holding temperature constant at 14.1掳C 卤0.1掳C, and sequentially changing relative humidity (RH) from 85%, to 75% and 65%. Each RH level was held constant for a period of 30 days; which required, a cycle of 90 days to complete one set of treatments. A total of three cycles and an additional period at 85% RH were necessary to complete 300 days of storage. Inside a second room variable temperature conditions were performed, with each temperature cycle lasting 90. Cycles were divided into five periods of 15 days each. At each period temperature was held at constant in the following order: 14.4掳C, 17掳C, 14.4掳C, 19掳C, 14.4掳C. Simultaneously, 'Covington' sweetpotatoes were stored in commercial storage rooms, with the temperature and relative humidity held constant at 14.4掳C 卤1掳C and 85% 卤 5%, respectively, for the duration of all tests. Temperature, relative humidity and weight of sweetpotatoes were measured every hour for the entire duration of the study by a data acquisition system designed and built for this specific application. Measuring density during long-term storage of 'Covington' sweetpotato under both variable temperature, and stable commercial storage conditions, was used to characterize the density change over time and varying environmental conditions. Density was also measured on 'Beauregard', 'Carolina Rose', 'Evangeline', and 'Hatteras' sweetpotatoes varieties stored under variable temperature conditions. In addition to density, other parameters such as dry matter, glucose, sucrose, fructose, maltose, Brix degrees, starch, beta-carotene, phenolic, vitamin C and fat in chips after fry-test were analyzed. The nutritional values during the first year were measured by chemical analysis and high pressure liquid chromatography (HPLC) and during the second year by near infrared spectroscopy (NIR) with a prediction curve based on the first year results. Density was measured by simple weight and volume displacement. Advanced statistical modeling was applied to develop mixed effects statistical models to predict weight loss of the five different varieties of sweetpotatoes during long-term storage as a result of temperature and water stresses. The models were developed using the Statistical Analysis System, SAS, version 9.3 for Windows. Linear mixed models were fit using the MIXED procedure. Relative humidity treatments and variety significantly (P
摘要译文
“博勒加德”，“科文顿”，“伊万杰琳”，“哈特拉斯和州罗斯甘薯（甘薯（L）林）根美国分级1号分别存放在环境控制的房间300天。所有在本研究中使用的甘薯根生长，并存储在北卡罗来纳州东部。相对湿度对根重损失的影响进行了实验以保持温度恒定在14.1掳Ç卤0.1掳下测定，并从85％25顺序地改变相对湿度（RH），以75％的25和65％的25。各相对湿度水平保持恒定，为期30天;这就要求，90天一个周期完成一组治疗。一共有三个周期在85％25的额外期限相对湿度是必要的，完成300天存储。内的第二室可变的温度条件下进行，每一温度循环持续90循环被分成的每个15天五个周期。在每个周期温度恒定举行以下顺序：14.4掳C，17掳C，14.4掳C，19掳C，14.4掳C.同时，“科文顿sweetpotatoes分别存放在商业储存室，与温度和相对湿度为14.4掳Ç卤1掳C和85％分别为25卤5％25，保持恒定，对于所有测试的持续时间。温度，相对湿度和重量sweetpotatoes的测定每隔一小时的研究中通过一个数据采集系统设计和建造这种特定应用的整个持续时间。在长期贮存的两个可变温度下的“科文顿”甘薯，和稳定的商业储存条件测量密度，被用于在一段时间和不同的环境条件来表征的浓度变化。密度，也测量在博勒加德，州玫瑰“，”伊万杰琳和哈特拉斯变温条件下储存sweetpotatoes品种。除了密度，其它参数如干物质，葡萄糖，蔗糖，果糖，麦芽糖，糖度度，淀粉，β-胡萝卜素，酚类，维生素C和脂肪后鱼苗-测试芯片进行分析。在第一年期间的营养值是通过化学分析，高压液相色谱（HPLC），在第二年的近红外光谱（NIR）与基于第一年的结果的预测曲线测定。密度是通过简单的重量和体积排量测量。先进的统计建模应用于开发混合效应统计模型在长期存储作为温度和水分胁迫的结果来预测减肥的五个不同品种sweetpotatoes的。该模型利用统计分析系统，SAS版本9.3为Windows开发。线性混合模型使用混合程序适合。相对湿度治疗和各种显著（P
Garzon, Jose Gualberto. Analysis by Applying Near-Infrared-Refractography and Statistical Modeling of Sweetpotato Weight Loss, Density and Quality Change Due to Long-Term Storage, Temperature and Water Stress[D]. US: North Carolina State University, 2013