Longan is a famous specialty fruit in southern China. Due to the high temperature during the harvest period, the fruit respiration is very strong, the consumption of nutrients is quick, the water evaporates, and the pericarp is rapidly aging. At the same time, the longan fruits are thin, juicy, and high in sugar content. Due to mechanical damage and infectious bacteria, a variety of technical measures must be taken after harvest to preserve freshness. The methods are as follows: 1. Harvest: Longan for storage is suitable for 1989 mature harvest, ie when the peel is changed from blue to blue It is yellow-brown, and the fruit changes from hard to soft and elastic, and when the raw green taste disappears, it is harvested. Fruit picking should be carried out in the morning or early evening. Avoid picking fruit on rainy days or typhoon days. When picking fruit, it usually takes 1 to 2 compound leaves to cut off, so don't use the base of the ear too deep. The longan fruits used for storage are mostly stored in whole ears to improve their storage stability. 2. Preservative treatment: The postharvest disease of longan fruits is mainly acid rot, which can be treated with Tecdo (0.05%) + imazalil (0.05%) for 2 to 3 minutes, and when the fruit is steeped, 0.01 is added to the fungicide. % of 2,4-D or gibberellin has a good antiseptic effect. Sulphur or sulfur dioxide sustained-release agents (such as sodium dithionate, etc.) fumigation of longan can effectively inhibit enzymes and mold, significantly prolong storage life, but the longan flavor and quality have a certain impact. 3. Pre-cooling: The long-season harvest season is due to high summer temperatures, 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 it is close to storage. 4. Selection of fruit packaging: longan storage should strictly remove the fruit and vegetable pests, mechanical injury, select the same fruit maturity, while removing the leaves of the ear and long spikes, so that the ear is neat. The inner package of longan should use a polyethylene or polypropylene bag with a thickness of 0.02mm. The plastic bag is better than the plastic bag. Because longan fruits have thin skin and many juices, the pericarp is easily broken and the outer packaging is preferably made of plastic baskets, wooden boxes or foam boxes. 5. Storage and transportation: 1 Normal temperature storage and transportation. The longan storage method at room temperature is after the fruits are treated with preservatives, then wrapped in polyethylene wrap and placed in a polystyrene foam box or corrugated box. The ice cubes are placed in the box and the ratio of fruit to ice is 2 to 3:1. The use of sheds for storage and transportation, which can be kept at room temperature for 7 to 8 days, has a good fruit rate of over 95%. 2 Low temperature storage. Longan storage temperature of 2 ~ 4 °C, relative humidity of 85% ~ 95%, the optimum gas ratio of oxygen 6% ~ 8%, carbon dioxide 4% ~ 6%. The longan is treated with preservative and pre-cooling, and is packaged in polyethylene film, placed in a suitable and relatively stable low temperature, and subjected to low temperature spontaneous gas withered and stored for 35 to 40 days.
Organic materials: also known as organic polymer materials, generally by C, H, O and other elements of the relative molecular weight of more than 100,000 (of course, there are other elements, such as S or P, etc.) generally speaking, solubility (divided into two kinds of swelling and dissolution), thermoplasticity (high temperature into the kind of viscosity) And thermosetting (seemingly low temperature and return to solid state), strength characteristics (than carbon or steel and other materials made of general strength is about twice its strength), electrical insulation, general organic materials have rubber, cellulose, protein, starch, high polymer, etc.
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Organic Raw Material
Organic Raw Material,Organic Material,Phosphoric Acid Tripropyl Ester,1 2-Dihydroxypropane
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