The most efficient deoxidizing preservative and it

High efficiency deoxidizing preservative and its feasibility analysis in packaging (III)

the following problems can be explained from the test results

(1) the blank control sample has different degrees of mildew growth due to the different mildew resistance of products and materials. It shows that the oxygen in the air in the sealed packaging container is enough to meet the growth of aerobic moldy rot fungi. Samples that are not resistant to mold, such as cow leather, yellow paperboard, cotton yarn and high-frequency winding wire, are moldy at Level 3

(2) the samples with deoxidizing and sealing agent after bacteria spraying and the samples without bacteria spraying and deoxidizing and sealing agent did not grow mold. It shows that the application of deoxidizer for packaging and sealing can achieve good anti mildew effect

(3) the test shows that the mildew growth of the product is related to the internal environmental conditions of the package, mainly the temperature, oxygen for surface cleaning of the experimental machine and the nutrients for mold growth (that is, whether the packaged sample provides the nutrients for mold growth) and has little to do with whether the sample in the package is sprayed with bacteria. Therefore, it is concluded that as a more advanced and reliable deoxidization package than vacuum packaging and sealed packaging, it has been mass produced in China at present, and the product quality standard is close to and reaches the national advanced level of the same kind, the deoxidization package can be included in the national standard of "mold removal packaging" and is recommended for use

2. Mold proof test:

test samples: leather for camera, artificial leather (Ocean dry paint base), artificial leather (rubber base), shutter blade, optical parts (convex and concave), camera grease (1, 2)

packaging materials:

tensile nylon/polyethylene, polyester/polyethylene test results: after the sample is sprayed with bacteria (eight kinds of mold spores provided by Beijing microorganisms, including Aspergillus heterophyllus, native Aspergillus, Aspergillus niger, Penicillium apicum, Penicillium flavum, Aspergillus Amsterdam, Aspergillus westermani, etc.), the comparative test with and without deoxidizer lasted 28 days, the temperature was 28 ± 2 ℃, R · H: greater than 90%, It is proved that the high-efficiency deoxidizing preservative and the reliability of the composite bag have good mildew resistance to the optical lens of the camera and artificial leather. On the basis of this test, the factory carried out a special productive test (special experiments need to add special friction accessory certificate tests. The cameras packed with deoxidizing preservative and ordinary polyethylene are placed in the warehouse of the wholesale Department of Shanghai department store, factory air raid shelters and other places for investigation for more than half a year, and then unpacked and identified. The deoxidizing packaging has good anti mildew effect and 100% reliability. Therefore, the quality supervision department of the factory sets the deoxidizing packaging into the technical conditions, and provides the accessory factory with leather cases that must adhere to the strategy drive with the same requirements Deoxidized packaging, test into productive application. There are no cases of repair and return due to mildew. The shelf life of the products after leaving the factory has been extended, the product quality has been guaranteed, the reputation has been improved, and good economic benefits have been received

3. Mold proof test of film and cosmetic carton

test samples: cosmetic carton, photographic film packaging materials: tensile nylon/polyethylene test results: the mixed spore solution of twelve kinds of molds, including Aspergillus variegatus, native Aspergillus, Aspergillus niger, Penicillium apicum, Penicillium, Aspergillus westermani, Aspergillus Amsterdam, Rhizopus, Trichoderma mucorum, Cladosporium paraphyllum, was sprinkled on the test piece, With and without deoxidizer, the test lasted 28 days, the temperature was 28 ± 2 ℃, and the pH was 90%. It was proved that high-efficiency deoxidizing preservative and composite plastic packaging had a strong anti mildew effect on cosmetic cartons and photographic films. The samples without deoxidizing preservative grew serious mold in only one week. It is worth mentioning that the deoxidized packaging of photographic films, photos, negatives, tapes, videos, CDs and films not only has good mildew proof effect, but also can better maintain the original color and sound quality

4. Exploratory experiment of grain storage

in addition to insect pests, rice generally grows a wide variety of microorganisms with different living habits. Some of the molds can make food moldy and deteriorate. Some of the molds can also produce toxins, causing human and animal poisoning. If a small amount of, long-term and continuous feeding animals, it can cause cancer in experimental animals. In order to reduce the mildew loss of stored sugar as much as possible, ensure the health of the people to 0.1mm, and achieve the purpose of safe storage for a long time, we must try to prevent pests and control the growth of mold. At present, the "three low" (low temperature, low oxygen and low phosphine dose) storage method can make the rice safe in summer without insects, fever and mildew. However, how to better maintain the quality of rice and ensure food hygiene has been the goal of the grain system for many years

it is understood that in recent years, some progress and achievements have been made in the experimental research work of vacuum nitrogen charging, carbon dioxide "hibernation" and controlled atmosphere storage. Since the development of deoxidized preservative, units of grain systems such as Shanghai, Jiangsu, Henan and Guizhou have come one after another, hoping to use deoxidized preservative. In more than two years, we have cooperated with relevant units to carry out experimental research on the whole stack of deaeration packaging from 1 jin to 300000 Jin. The application of deoxidizing preservative to grain storage is one of the main measures of anoxic grain storage as grain preservation. It is different from the biological anoxia in which grains breathe, consume oxygen and release carbon dioxide in storage; It is also different from the mechanical deaeration of nitrogen rich molecular sieves, nitrogen generators, nitrogen and carbon dioxide cylinders. It is chemical deoxidization

has the following characteristics:

(1) deaerator is non-toxic, tasteless, and pollution-free to grain and food

(2) after being sealed with the grain together with the composite film, it can still be vacuumed until the film is close to the grain stack to reduce the amount of deoxidizer. It can reduce the oxygen concentration in the whole grain stack to less than 0.1% in three days (the oxygen indicator is red), and it can maintain an anaerobic state for a long time. The storehouse insects can suffocate and die quickly. The bacteriostatic effect is significant. The rice quality and sensory identification results are better than other methods

such as the mildew proof test of rice with Shanghai second grain purchasing and supply station. Test sample: standard white Japonica Rice (moisture content 15.6%) packaging material: Polyester/polyethylene composite plastic bag test results: the samples are divided into deoxidized packaging, vacuum packaging and sealed packaging. The accelerated test at 30 ± 2 ℃ and H · r:80 ± 2% was carried out for 57 days, For the original rice samples and three kinds of packaged samples, the number of colonies detected and the distribution of bacterial phase on different culture media (strains include: Aspergillus albicans, aureomyces, Mucor, Penicillium, Aspergillus flavus, Aspergillus glaucus, Aspergillus variegatus, Aspergillus Sabouraud, mycorrhizal, Curvularia lunata, Alternaria, Fusarium, Trichoderma, Aspergillus coking, etc.), it was found that the number of molds detected in the rice samples sealed with deaerator decreased compared with the original, The number of molds in vacuum packed rice samples increased by dozens of times, while that in sealed packaging increased by hundreds of times

rice quality analysis and sensory identification results project packaging method moisture% fatty acid mg/100g iodine common value (light transmittance) sensory identification results original rice sample 15.6 76.7 46.5 color white, shiny, rice flavor plus deaerator packaging 14.5 150.5 50 color, flavor and taste are close to the original sample true empty packaging 14.8 155.8 54 rice color is normal, slightly alcohol flavor sealed packaging 44.7 154.4 52 rice quality is stiffened, There is alcohol taste. Compared with the storage test of 100000 Jin rice in large piles done by Nanjing Jicun grain depot, the deoxidized storage is "three low" storage. Trial rice sample: Standard Japonica Rice (moisture 15.2%) packaging material: Polyester/polyvinylidene chloride (deoxidized storage stack) polyvinyl chloride (0.18 mm thick conventional "three low" storage stack) test results: three stacks of grain test period of half a year. The ambient temperature and humidity change naturally in the warehouse. It lasted six months. Analyze the amount of bacteria carried and the number of mold detected on the original rice samples and the samples packed with "three low" and high-efficiency deoxidizing preservative. (strains include Aspergillus flavus, Aspergillus albicans, Aspergillus terrestris, Aspergillus brownii, Aspergillus glaucus, Aspergillus variegatus, Aspergillus niger, Penicillium, Chaetomium globosum, broom mold, Rhizopus, Cladosporium, Fusarium). Whether the number of whole grain mold or the number of internal mold. It was found that the rice samples sealed with deoxidized preservative were lower than the "three low". The taste results also confirmed that the rice packaged with deoxidized preservative was better than the "three low" from the aspects of color, aroma and taste

(3) deoxidizing preservative is used in grain storage, which is simple to operate, not affected by regional climate and internal factors of grain, and has no higher requirements for grain facilities and management than the current system, reducing management and other costs

(to be continued)