Longan storage like this

The long-term harvest period has high temperatures, strong fruit respiration, rapid consumption of nutrients, large evaporation of water, rapid skin aging, and thin, juicy, high sugar content longan, which is vulnerable to mechanical damage and infectious bacteria. Therefore, it must be taken Comprehensive technical measures for harvesting and storage preservation. The methods are as follows: 1. Harvesting longan for storage is recommended to achieve eight to nine mature harvests, that is, when the pericarp is turned from blue to yellow-brown, and the fruit is changed from hard to soft and elastic, and the raw green taste disappears. . Fruit picking should be carried out in the morning or in the evening. Avoid picking fruit on rainy or windy days. When picking fruit, it usually takes 1 to 2 compound leaves, and don't use the base of the ear too deep. The longan fruits used for storage are often stored in full heads to increase the resistance to storage. 2. Antiseptic treatment The disease after longan fruit picking is mainly acid rot. It can be treated with Tecdo (0.05%) + imazalil (0.05%) for 2 to 3 minutes, and when adding fruits, 0.01% is added to the fungicide. The 2,4-d or gibberellin has good anti-corrosion effect. 3, pre-cooled longan harvest is in the summer and autumn, so pre-cooling is particularly important for longan preservation. There are many ways to pre-cool, you can use antiseptic treatment to dip medicine with ice water, or after the anti-corrosion treatment into the pre-cooling room for fruit packing, can also be quickly placed in the cold storage after packaging, first placed separately to dissipate heat Cool down and wait until storage temperature is higher. 4. Select fruit packaging Longan storage fruit should strictly remove the disease and fruit, mechanical injury, select the fruit with the same maturity, while removing the leaves and overlying spikes on the ear, so that the ear is neat. The inner package of longan should use a polyethylene or polypropylene bag with a thickness of 0.02 mm. The plastic bag is better than the plastic bag. Because the longan is thin and easy to be broken, the outer package should use plastic baskets, wooden boxes or foam boxes. 5. Storage and transportation 1 Normal temperature storage and transport of longan at room temperature The fruit is treated with preservation and then wrapped with polyethylene preservation film and placed in a polystyrene foam box or corrugated box. The box is filled with ice cubes and fruit ice. The ratio is 2-3:1. It can be stored and transported in a shed. It can be stored at room temperature for 7-8 days, and the good fruit rate is over 95%. 2 The temperature of low temperature storage longan after harvest is a key factor affecting the storage life of the fruit. Longan is sensitive to the storage temperature and is suitable for low temperature storage. Its storage temperature is 2-4°C. At the same time, the relative humidity of longan is required to be 85%-95%, the optimum gas ratio is 6%-8%, and the carbon dioxide concentration is 4%-6%. The longan is treated with preservative and pre-cooling, and is packaged with polyethylene film, placed in a suitable and relatively stable low temperature, spontaneously with low temperature and withered and stored for 35 to 40 days.

Peptides Products

An organic compound formed by dehydration of amino acids, containing carboxyl and amino groups, and being amphoteric. Also known as "peptide".
Two, one of the amide. It consists of two or more amino acids joined by the amino group of one amino acid to the carboxyl group of the other. An amino acid cannot be called a peptide, nor can a peptide be synthesized, but must be a compound of two or more amino acids linked by a peptide bond. Compounds where two amino acids are linked by a peptide bond are called dipeptides; A compound with three amino acids linked by peptide bonds is called a tripeptide, and so on, a compound with thirty-four amino acids linked by peptide bonds is called a thirty-four peptide.
A peptide is a chain of polymers of amino acids
A peptide is a chain of polymers of amino acids

Three, is related to the biological body of a variety of cell functions of biological active substances. Hundreds of peptides have been found in living organisms, which are essential participants in the body's complex physiological activities. All cells can synthesize peptides and their functional activities are regulated by peptides. It involves hormones, nerves, cell growth and reproductive fields, and its importance lies in the regulation of various systems, organs and cells in the body. The physiological and pharmacological effects of enzymatic polypeptides are mainly to activate related enzymes in vivo, promote the permeability of intermediate metabolic membrane, or affect specific protein synthesis by controlling DNA transcription or translation, and eventually produce specific physiological effects or play their pharmacological effects. Peptide is better than amino acid, one is faster than amino acid absorption; Second, it is absorbed by the body in a complete form; Third, active absorption (amino acids are passive absorption); Fourth, low consumption, compared with amino acids, peptide absorption has the characteristics of low consumption or no energy consumption, peptide absorption through the duodenum, directly into the blood circulation, their own energy nutrition transported to various parts of the human body; Fifth, peptide absorption is less than amino acid, with the characteristics of unsaturated; Sixth, there are only 20 kinds of amino acids, with countable functions, while peptides take amino acids as substrates, which can be synthesized into hundreds of thousands of kinds.

It is mainly divided into medical polypeptide drugs, peptide antibiotics, vaccines, antimicrobial peptides for agricultural use, small peptides for feed, cosmetics for daily use, soybean polypeptides for food, corn polypeptides, yeast polypeptides and sea cucumber peptides.
From the functional point of view, can be divided into antihypertensive peptide, antioxidant peptide, cholesterol lowering peptide, opioid active peptide, high F value oligopeptide, food strong taste peptide and so on.
Active peptide, and nutrition, hormone, enzyme inhibition, regulation of immunity, antibacterial, antiviral, antioxidant has a very close relationship. Polypeptides are generally divided into: polypeptide drugs and polypeptide health products. Traditional peptide drugs are mainly peptide hormones. The development of peptide drugs has been developed into various fields of disease prevention and treatment, especially in the following fields. [2]
Antitumor polypeptide
Tumorigenesis is the result of many factors, but ultimately all involve the regulation of oncogene expression. In 2013, many tumor-related genes and regulatory factors have been discovered. Screening peptides specifically bound to these genes and regulatory factors has become a new hot spot in the search for anticancer drugs. For example, somatostatin has been used to treat endocrine tumors of the digestive system; American scholars found a hexapeptide can significantly inhibit adenocarcinoma in vivo; Swiss scientists have discovered an octapeptide that induces apoptosis in tumor cells. [2]
Antiviral polypeptide
By binding to specific receptors on host cells, viruses adsorb cells and rely on their own specific proteases for protein processing and nucleic acid replication. Therefore, peptides binding to host cell receptors or active sites such as viral proteases can be selected from the peptide library for antiviral therapy. In 2013, many small peptides with antiviral properties have been screened from peptide banks in Canada, Italy and other countries, and some small peptides have entered the stage of clinical trials. In June 2004, the Chinese Academy of Sciences institute of Microbiology came out of the news, which was undertaken by the Chinese Academy of Sciences known

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