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Pan L.,Hefei University of Technology | Xu X.,Beijing Vegetable Research Center | Luo J.,Hefei University of Technology
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

The effects of ultrasound-assisted extraction on extraction rate and physical characteristics of water insoluble dietary fibers (IDF) were studied. Based on the single factor experiments: the ratio of water to dry soybean dregs powder, ultrasonic power intensity, ultrasonic temperature and extraction time, the four-factor second order rotation combination experimental design was applied to optimize the parameters for IDF of ultrasound-assisted extraction. The physical characteristics of the IDF obtained by technology of ultrasound-assisted extraction (UAE) were examined by a combination of chemical and instrumental analysis approaches, including water-holding, extension, water-binding, fat-binding capacities, SEM, Fourier transform infrared (FT-IR) spectra and TG, and compared with acid dissolution and alkali precipitatiom (ADAP) and enzyme-assisted extraction (EAE). The results indicated that the highest yield of 92.11% was reached under the conditions which the ratio of water to dry soybean dregs power was 35 mL/g, ultrasonic power intensity 600 W/g, ultrasonic temperature 50°C and extraction time 50 min. The IDF obtained by UAE had higher water-holding, extension, water-binding and fat-binding capacities, and much abundant reticular structure than those obtained by ADAP and EAE. The analytic data of FT-IR and TG indicated that ultrasound treatment could raise the free hydroxyl groups, but did not change its pyrolysis mechanism. In conclusion, UAE not only increased the extraction rate of IDF, but also improved physical characteristics. Source

Snyder J.,University of Kentucky | Min C.,Beijing Vegetable Research Center
Acta Horticulturae | Year: 2012

The core collections of two tomato wild relatives, Lycopersicon hirsutum and L. pennellii, were screened in the open field for resistance to aphids. Nearly all accessions of L. pennellii were resistant to aphids. For the accessions of L. hirsutum, some accessions were very susceptible, some were intermediate and others were extremely resistant. When these lines were being screened for aphid resistance, a line of L. hirsutum, LA2329, was discovered that possessed resistance to leaf miner (Liriomyza spp.). Subsequent attempts to evaluate spidermite and leafminer resistance in this line and in hybrids of LA2329 with cultivated tomato indicated that resistance was dominant and relatively easy to transfer to the hybrids. This is an unusual result since a high level of resistance is not commonly uncovered in early generations of tomato interspecific hybrids. Recovering resistance in early generation backcross populations is equally unusual. In order to study mechanism of resistance, we have conducted spider mite bioassays on a range hybrids of interspecific origin. Progress, including our most recent results with the second backcross gene ration is reviewed. Source

Chen J.,Beijing Forestry University | Li L.,Beijing Forestry University | Wang S.,Beijing Forestry University | Tao X.,Beijing Forestry University | And 3 more authors.
International Journal of Food Properties | Year: 2014

The contents of individual and total glucosinolate in Chinese kale (Brassica albograbra Bailey) were determined and analyzed using near-infrared spectroscopy. The near infrared calibration mathematics model between total glucosinolate contents and spectral measurement was established based on modified partial least squares. The coefficient of determination of the cross-validation (1-VR), coefficient of determination in prediction and ratio of the standard deviation to the standard error of the cross-validation of the near-infrared spectroscopy calibration equations were 0.92, 0.91, and 3.59 for total glucosinolates; 0.87, 0.82, and 2.78 for gluconapin; 0.93, 0.93, and 3.84 for glucobrassicin; and 0.86, 0.90, and 3.70 for neoglucobrassicin. Near-infrared spectroscopy showed high accuracy in predetermining individual and total glucosinolate contents in Chinese kale. Copyright © Taylor & Francis Group, LLC. Source

Zhao H.,China Agricultural University | Han D.,China Agricultural University | Song S.,Beijing Vegetable Research Center | Chang D.,China Agricultural University
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

For the purposes of detecting the maturity of small watermelon and real-time monitoring its internal quality during the growth, this paper studied a variety of basic information in constantly changing circumstances along with growing days of mini watermelon fruit Jingxiu. During the growth, the majority of the small watermelon basic information changes follow certain regularities and some indicators regularities are similar. Based on the correlation analysis, the factor analysis and the new constructed variable results, it can be found that the quality changes of the small watermelon fruit Jingxiu mainly manifest as the content changes of soluble solids, titratable acidity, flesh moisture and chlorophyll from 20 to 39 days after pollination process. Among these changes, the chlorophyll content changes notably in the course of 22 to 25 days after pollination process, while the other three primarily change in the course of 28 to 30 days. The quality becomes stable during the growth process of 31 to 39 days except some small fluctuations within a small range. The results can provide a basis for selection of parameters for optical non-destructive testing of small watermelon quality and maturity. Source

Mingchi L.,Beijing Vegetable Research Center | Xiangli L.,China Agricultural University | Jing H.,China Agricultural University | Lihong G.,China Agricultural University
Acta Horticulturae | Year: 2010

Plant growth, photosynthetic and physiological characteristics, fruit quality and yield were studied under simulated drought stress using CaCl 2 solution to improve tomato fruit quality. Under simulated drought stress, water potential and transpiration rate decreased, free water decreased and bound water increased. Photosynthetic rate, stomatal conductance and intercellular CO 2 were reduced. Drought stress improved fruit quality, SSC, organic acid, and vitamin C, increased sugar/acid ratio, but decreased yields. Under simulated drought stress, the number of fruits almost did not change but the weight per fruit was reduced. Dry matter content per fruits increased, and the total dry matter content per section did not change. Source

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