Papers by Keyword: Vegetable

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Authors: Ching Shang Cheng, Xiao Yong Lin, Chun Hong Liou, Guang Xin Xing, Wai Pin Fu
Abstract: In our study, we tried to extend the preservative time of vegetables, and fruits to use the ethylene absorbent method, and the plasma reaction method to decrease the ethylene content of the conditions of the storage tank. In experimentation, we discovered that banana will release ethylene, and banana will be accelerated the ripening, when the ethylene was present. The ripening rate was equal to the ethylene production rate, that was a first order functional relationship of the ethylene concentration, γe=0.21C. The ethylene absorbent in the two experimental groups had removed indeed the ethylene, and had an effecting to keep fresh of the banana. In our plasma experimentation, we found that logarithmic value of the ethylene concentration(C) was direct proportion to the reaction time, and the ethylene reaction rate rp = -22.6C. In our study, the banana weight of each run of our experiment was 420 gram, and our plasma reactor can handle 45 kilogram banana because the │rp│is nearly 107 times of │re│.
2223
Authors: Jun Ying Zhao, Xing Long Jin, Zhao Li Shen, Hua Ming Guo
Abstract: Concentrations of selected heavy metals (Cd, Cu, Pb, Cr and Zn) were determined in vegetables (radish, tomato, gourd, celery, lettuce, Chinese lettuce, Garland chrysanthemum, rape, Chinese cabbage, Sonchus) from the wastewater irrigation area in Tianjin, China. Cd contents in the edible parts were not significantly different among all vegetables. Zn concentration in the leafy vegetables was the highest of all the heavy metals. The metal contents in the vegetables were compared with the Chinese national standards for food quality. The contaminant index of Cr, Pb, Cd and Zn varied respectively between from11.96 to 22.26, from 5.36 to 14.43, from 0.95 to 15.4 and from 0 to 4.06. Although Cu content of the vegetables except lettuce was lower the permitted standard, the results indicated these vegetables could not be regarded as safety for human consumption.
527
Authors: Hui Zhen Wang
Abstract: Fresh vegetable logistics is an important part of agricultural product logistics in our country, but the unique characteristics of fresh vegetables, fresh time for vegetable logistics requirements is strong. therefore, the logistics mode selection of fresh vegetables is particularly important, several modes of vegetable logistics,are analyzed in detail in this paper, and provide some reference for the fresh vegetable logistics mode select.
1084
Authors: Ying Lan Jiang, Ruo Yu Zhang, Jie Yu, Wan Chao Hu, Zhang Tao Yin
Abstract: Agricultural products quality which included intrinsic attribute and extrinsic characteristic, closely related to the health of consumer and the exported cost. Now, imaging (machine vision) and spectrum are two main nondestructive inspection technologies to be applied. Hyperspectral imaging, a new emerging technology developed for detecting quality of the food and agricultural products in recent years, combined techniques of conventional imaging and spectroscopy to obtain both spatial and spectral information from an objective simultaneously. This paper compared the advantage and disadvantage of imaging, spectrum and hyperspectral imaging technique, and provided a description to basic principle, feature of hyperspectral imaging system and calibration of hyperspectral reflectance images. In addition, the recent advances for the application of hyperspectral imaging to agricultural products quality inspection were reviewed in other countries and China.
909
Authors: Hong Mei Xia, Qing Rong Li, Zhi Wei Li
Abstract: Structure plan of a new type of pneumatic plate-type vegetable seeder was put forward, and virtual prototype of the seeder was established in the paper. By kinematics simulation and analysis, L-shape arm length and minimum distance between metering device and cell plug tray were optimized. The machine control system and air pressure switch system were designed in detail. Results of orthogonal test show that, the main influence factor for single-seed rate and empty-seed rate is sowing efficiency, the second is diameter of suction hole, next is relative pressure, the minimum is interaction between those factors. The main influence factor for multi-seed rate is diameter of suction hole, the second is relative pressure, next is interaction between factors, the minimum is sowing efficiency. The best seeding effects can be achieved under the condition of 0.9 mm suction hole diameter, -4.5 kPa relative pressure, and 200-tray per hour sowing efficiency. The single-seed rate can be up to 93.59%, the empty-seed rate is 1.25%,and the multi-seed rate is 5.16%。
627
Authors: Li Ping Xu, Xin Wang
Abstract: 12 kinds of vegetables were determined the content of mercury, arsenic and plumbum by atomic fluorescence spectrometry. The results of 12 kinds of leafy vegetables, root vegetables and vegetables eggplant were compared with national standards. The results showed that the content of vegetables in all determined vegetables were accord with national standards. The content of mercury in celery, carrots and radish were all light disqualification, they were higher 0.003mg/kg, 0.002 mg / kg and 0.002 mg/kg than national standards, respectively. Most of contents of plumbum in vegetable were higher than national standards. Leafy vegetables were higher than root vegetables and root vegetables were higher than vegetables eggplant. The highest was the leek, which was 0.808 mg/kg, higher 0.608 mg/kg than national standards.
1328
Authors: Yang Li, Guang Sheng Li, Guang Fa Liu, Yi Mei Kan, Jian Qing Wang
Abstract: In this paper, modified atmosphere packaging (MAP) film of fruit and vegetable was prepared through extrusion blow molding process.The LDPE was used as matrix resin and medical stone powder as the main filler. Stearic acid was added into film as a kind of surfactant. Effect of particle size, stearic acid proportion,filler amount and stretch pocessing on properties of MAP film was studied through measuring its oxygen and water vapor permeability,tensile strength as well as elongation ratio.Experimental investigation indicated that for preparing MAP film with high permeability, the controlled conditions such as 325 mesh medical stone powder, additive amount of 20 phr with stretch processing, stearic acid proportion of 2/10 were required.
135
Authors: Chen Lin, Xiu Li Ge
Abstract: Heavy metal zinc is one of the trace elements necessary to the growth of vegetable, but Zn excessiveness also could cause damage. In this research, four vegetables were planted by soil culture method under different Zn2+ concentration controlled by the exogenous Zn2+ addition; their growth characteristics were analyzed to find the sensitive growth indexes to Zn and compare their tolerance to Zn pollution. Results show that: low concentration of Zn2+ (< 100 mg/kg) can promote significantly the plant height and the root length growth of all the four vegetables, while, as the exogenous Zn2+ increased to the concentration of 150 mg/ kg, the number of leaves, the above-ground dry biomass and the underground dry biomass were suppressed significantly; in this experiment, the four vegetables appeared different sensitivity to Zn stress, Lactuca sativa var. longifoliaf appeared highest tolerance and Brassica chinensis appeared less sensitivity to Zn stress.
613
Authors: Qing Bao Gu, Chang Sheng Peng, Qian Zhang, Fa Sheng Li
Abstract: Greenhouse trials with brassica camprestris (BC) and raphanns sativns (RS) grown in three types of Chinese soils (Henan fluvo-aquic soil; Jilin black soil; and Hunan red soil) were conducted to evaluate the growth effect and accumulation of As on/in vegetables resulting from different arsenic contents in soils. The arsenic uptake rate of the vegetables response to type of soils and investigated plant species as well. Experimental results show that low arsenic content in soil has no effect on vegetable growth, but promote the biomass of vegetables. However, higher arsenic concentrations in soils lead to decrease in growth of both leaf- and root systems of the vegetables, especially when arsenic concentration is above 90 mg kg-1 in the soil. Arsenic levels in soils and vegetables correlated positively according to the experimental results. The tests also reveal that vegetables grown in alkali soils may accumulate more arsenic than that in acid soils, which suggests that arsenic in different types of soil may have different impacts on vegetables even with the same concentration. Arsenic concentration in RS is always higher than that in BC during the experiments, which indicates root vegetables may, have greater ability for arsenic uptake from soil than leafy vegetables potentially.
2048
Authors: Shu Lai Xu
Abstract: In order to process and preserve vegetables by High Pressure Processing (HPP), the texture and tissue of celery processed by HPP was studied in this paper. HPP is gaining in popularity with the world food industry. However, processing and preservation of vegetables by HPP is an advanced technology. In this study, ten celery samples had been treated at the diverse pressure for different time respectively. Furthermore, the slices of the samples before and after HPP had been made and observed by microscope. Although little celery juice effused at ultra high pressure (600 MPa) for 5 min or at 400 MPa for longer time (more than 20 min), the comprehensive observations and analyses showed that in general the texture and tissue of celery could not be damaged by high pressure. The conclusion is that processing celery at 600 MPa for 5 min is the practicable technology.
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