40 results about "Residual vol" patented technology

The invention discloses a lead removal method for porphyra haitanensis, which includes that fresh porphyra haitanensis and deionized water in weight volume ratio of 4.5-5.5:25 are placed in a container, the container is moved to an ultrasonic wave exactor for performing ultrasonic treatment on the porphyra haitanensis with the ultrasonic lasting time of 0.3-0.6 and interval of 0.7-0.4 sec and at the ultrasonic temperature of 25-45 DEG C and ultrasonic frequency of 25 KHz, and the total ultrasonic treatment time is 15-25 min; after the ultrasonic treatment with specific conditions, the lead removal rate of porphyra haitanensis can reach more than 92%, and the lead residual quantity of porphyra haitanensis is lower than the national standard requirement, the harmfulness to people on having porphyra haitanensis, in particular to children is reduced; besides, the lead removal method has no pollution to porphyra haitanensis, has slight influence on the quality of porphyra haitanensis, shorter removal time, high speed and higher removal rate.

100-stage cleaning laminar flow inoculation under barotropic atmosphere during edible fungus industrial cultivation belongs to edible fungus production technology. The invention aims to solve the following problems: the existing open inoculation is inadvisable to be adopted under the conditions of plum rain seasons and high temperature and high humidity climate; poisonous residual quantity emerges when spatial standard sterilization is carried out in the inoculation environment; and the success rate of inoculation generally fluctuates from 97% to 99%. The invention is characterized in that fresh air enters into the top of the workshop under the pressure higher than the normal atmosphere pressure and is exhausted downwards after being efficiently filtered and purified by a 100-stage cleaning laminar flow cover; the inoculators, the inoculation machines and the fungus flask transfer cars are all arranged in 100-stage cleaning laminar flow from top to bottom; and the barotropic atmosphere of the 100-stage cleaning laminar flow from top to bottom is at least higher than 30Pa, the gas pressure in the cooling workshop and the corridor of the fungus culturing workshop. The invention preliminarily realizes the following beneficial effects: inoculation can be carried out in due time at all seasons according to the production requirements; the problem of poisonous residual quantity emerging after standard sterilization is prevented; and the success rate of inoculation is stably as high as 99.7-99.9%.

The invention belongs to the field of product quality detection and in particular relates to a rapid detection method of residual amount of dimethylformamide in textiles. The method provided by the invention comprises the following steps of: preparing a guide sample and an internal standard solution; pre-treating the sample; extracting DMF (Dimethyl Formamide) in the sample; carrying out GC / MS (Gas Chromatograph / Metabolic Syndrome) analysis; and detecting the content of DMF through a standard addition method. The method provided by invention can be used for detecting the residual amount of DMF in products including leather, textiles, paper products and the like and various raw materials. Compared with the prior art, the method disclosed by the invention has the advantages of flexibility, accuracy, environment friendliness, simplicity, reliability and easiness of being popularized and is highly effective in detection of the residual amount of DMF in various products and raw materials.

The invention discloses a GC-NCI-MS (gas chromatography-negative chemical ionization-mass spectrometry) determination method of residual amount of fluoride ether bacterium amide. The method is mainly used for determining the residual amount of fluoride ether bacterium amide in cereal grains, animal-derived foods and other complex matrix food agricultural products. The method comprises the following steps: homogenizing and extracting residual fluoride ether bacterium amide in a sample with acetonitrile or an acetonitrile solution containing 1% of acetic acid, performing purification and concentration by a C18 / PSA solid-phase extraction column, performing GC-NCI-MS detection, establishing a standard curve for correction by adopting a blank matrix solution without a pesticide to be detected, and quantifying by an external standard method. According to the method, the average recovery rate is 85.0%-91.1%, the average relative standard deviation (RSD) is 4.1%-6.6%, the detection limit is lower than 0.35mu g / kg, and the method has the advantages of simplicity and convenience in operation, high speed, good impurity removal effect, high sensitivity, strong characteristic feature, good repeatability and accurate qualitative and quantitative properties. According to the method, the technical requirement of 'being standard without exceptions' of the residual limit of 0.01mg / kg can be met, and a powerful technical support is provided for ensuring food safety of people in China and health development of export trades.

The invention discloses a measuring method of the residual quantity of preservatives. The measuring method of the residual quantity of the preservatives is used for simultaneously measuring five preservatives through using gas chromatography-mass spectrometry, the five preservatives comprise methyl p-hydroxybenzoate, ethyl p-hydroxybenzaote, beta-naphthol, 4-phenylphenol and diphenyl ether; and the measuring method of the residual quantity of the preservatives specifically comprises the following steps of: smashing a sample to be measured, performing ultrasonic extraction on the sample to be measured through an organic solvent, concentrating the sample to be measured through a parallel evaporator for the first time, purifying the sample to be measured through a solid phase extraction column, concentrating the purified sample to be measured for the second time, fixing the volume through methanol, filtering the treated sample, and performing gas chromatography-mass spectrometry analysis on the filtered sample. The method has the advantages of being convenient and quick for operation and good in repeatability, and the like, the adding standard recovery of the method is 80.5-104%, the relative standard deviation (RSD) is 1.21-6.41%, and the method is capable of meeting the monitoring demands of the residual quantities of the five preservatives in fresh fruits.