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essay代写-New technology for food testing

2018-04-16 | 来源:51due教员组 | 类别:Essay代写范文

本篇essay代写- New technology for food testing讨论了食品检测新技术。随着人们生活质量的提高,人们的消费观念也在逐渐发生变化,人们的食品不再自给自足,而是倾向于市场消费,这导致食品安全的风险逐渐增大。食品安全与人类的生活息息相关,先进的食品检测技术能够快速、准确的检测出食品中存在的安全问题,进而保障人身安全。因此,相关部门应加大对食品检测的重视,不断研究生物技术等食品检测新技术,进而降低食品给人们带来的安全隐患。本篇essay代写51due代写平台整理,供大家从参考阅读。

food testing,食品检测新技术,essay代写,代写,paper代写

Foodborne disease refers to the disease that causes the disease factor to enter the body through food intake, which can be divided into two kinds: toxic disease and infectious disease. More common foodborne diseases include zoonotic diseases, parasitic diseases, diseases caused by chemical toxins, intestinal infectious diseases, food poisoning, etc. There are several reasons for foodborne diseases: some organisms may increase gene mutation, gene level transfer, gene recombination and other foodborne diseases in the course of evolution. Pesticide residues can cause foodborne diseases; Lack of government funds and food hygiene detection methods will also cause foodborne diseases. Some food processors lack the awareness of food safety and add inferior materials to the production process. Some departments or farmers use antibiotics in their farming practices, leading to the emergence of "superbugs". These factors can lead to the emergence of microorganisms, which in turn cause foodborne diseases.

Microorganisms have a lot of foodborne disease, such as salmonella, campylobacter, a type of e. coli, the bird flu virus, aflatoxin and mononuclear cell hyperplasia liszt fungus, nguyen virus, staphylococcus aureus and its enterotoxin, botulinum toxin, pathogenic vibrio, h. pylori, foot and mouth disease and so on, these microbes will seriously affect the food safety, and even cause safety accidents.

Microorganisms can cause foodborne diseases, and when foodborne diseases break out, the number of people involved is few hundred and tens of thousands, which poses a great threat to people's life security. In foodborne disease control guidelines issued by the world health organization, made up of biological factors of foodborne illness pathogenic factors accounted for 84%, including 17 kinds of germs, 18 species of parasites and 7 kinds of biological toxins. Thus, it can be seen that controlling microbial risk factors in food is very important to ensure food safety.

Biotechnology is a new technology developed in recent years, which is based on microscience and modern science and has obvious advantages in food testing. The biological detection technology is sensitive, precise, specific, fast and selective, and has strong specific biological recognition function. The widely applied biological technology in the food safety have PCR technique, gene probe technique, biosensor technique, immunological detection technology, biochip technology, such as below will be specific to the several kinds of technology and its application is analyzed.

PCR, also known as polymerase chain reaction, consists of three basic steps: renaturation, denaturation and extension. In recent years, the technology has been widely used in the field of food safety detection. It combines PCR amplification rate, to amplification of DNA molecular template respectively, and the complementary oligonucleotides nuclear acid fragment as primers, only need a small amount of material can be expanded to a large number of target fragments, in accordance with the reserved copy mechanism, under the function of DNA polymerase, along the template strand extends to complete DNA synthesis, and then complete the qualitative and quantitative analysis of the samples. The product of PCR technology can meet the needs of various analyses and is a powerful tool for various analyses. However, the operation of PCR technology is complex, and the requirements of relevant technicians are relatively high, and relevant technicians must master certain techniques to control the instruments related to PRC technology. The PRC technology has only been introduced into the field of food testing in recent years, and it is mainly used in the detection of genetically modified foods. For example, Taq Man PRC rapid detection of jejunum campylobacter and real-time fluorescence quantitative PCR technology in the field of transgenic food detection.

Gene probe technology is mainly applied to the detection of food microorganism, which is an important content in modern biological detection technology. Nowadays, gene probe technique in the application of food mainly in phase of hybridization and heterogeneous hybrid two kinds, compared with the traditional microbiological methods, gene probe technology, simple operation, high flexibility, time saving and convenient, but the high cost of gene probe technology. Gene probe technology is the core of a specifically to target genes or DNA complementary nucleotide sequence, the sequence of varied in form, it can be part of the gene, also can be the entire genetic sequences, and even can be formed by DNA transcription of RNA, the diversity of sequence provides the concrete method of gene probe with more variety of choices. Gene probe technology has been widely applied in the detection of food microorganism, such as nucleic acid probe to detect breeding manager li bacteria in food, using enzyme-linked immune fluorescence analysis technology to test the conventional culture.

Biochip technology is a industry of semiconductor materials and DNA hybridization probe technology of combining the new detection technology, its application in the food safety testing mainly include the food nutrition, food ingredients, food safety and hygiene inspection. The principle of biochip technology is to use trace sample points or the optical methods of in situ synthesis, make a lot of samples of biological molecules in a sequence of standard curing on the surface of solid support, the formation of tight two-dimensional molecular sequences, and then will have finished marking the samples to be detected target molecular hybridization with two-dimensional molecular sequences, analyze the hybridization signal strength, to determine the number of target molecules. The production process of biochip technology is relatively simple, and the research on biochip technology in China and abroad has made some progress. Biological chip technology in food detection outstanding advantages, wide application, it can be through drug screening, gene diagnosis, individual medical method, to test the disease, thus achieve the goal of food testing.

Biosensor technology is mainly used with functions of chemical identification of biological material in the food pathogen detection, its main components include signal processing devices, biological sensitive components and change to components. The sample of biosensor is small in quantity, simple in operation and quick in response, which has a great advantage in food testing. The application of biosensor technology in food safety testing mainly includes the following two aspects: first, to test the freshness of fish, meat and other foods; The second is to test the taste and familiarity of food, such as a new type of biosensor developed in Japan that can taste the broth.

Immunological detection technology in our country, widely used in food detection, immunological detection techniques to antigen antibody as the basic principle, its high sensitivity and low detection cost, analysis of large capacity, was warmly welcomed by the inspection department. Is currently the most widely applied in the field of food testing enzyme-linked immunosorbent assay, and the specific steps for with specific antibody on the tag on the enzyme, which is then made into enzyme mark antibody with antigen antibody response characteristics. In this way, the relevant technical personnel can make qualitative judgment according to the color of the reference. However, immunological detection techniques can only be applied to organisms that undergo genetic engineering modification.

In a word, food safety is closely related to human life, and advanced food detection technology can detect the safety problems in food quickly and accurately, thus ensuring personal safety. Therefore, relevant departments should pay more attention to food testing, and constantly study new technologies such as biotechnology, so as to reduce the safety risks brought by food.

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