In vitro diagnosis of fertility mainly includes the following three categories:
3.One Step FSH Menopause Test is a rapid, one-step, visual test for the qualitative detection of follicle stimulating hormone (FSH) in human urine. It is to be used as a confirmation of body hormone changes related to the symptoms associated with the changes of menopause and as an adjunctive screen of fertility for home use by women who are attempting to conceive but have been unsuccessful.
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1. Room temperature storage: The use of anti-corrosion preservatives dissolved in water can quickly form a transparent film on the surface of longan, effectively closed the stomata, reduce respiratory intensity, prolong fruit senescence, and can play a role in antisepsis and sterilization mechanism for fruit preservation, and then Packed in polyethylene film or ethylene-vinyl acetate film, tightly packed in film bags and stored at 28-32°C for 5-8 days. The good fruit rate can reach 96%, which is 4 to 5 times longer than fresh fruit without drug treatment. day. Common anti-corrosion preservatives include sec-butylamine, tetoxyl, imazalil, carbendazim, and thiophanate-methyl. However, the normal-temperature storage and preservation technology currently applied to large-scale, long-term storage and transportation of longan fruits is not yet mature.
2. Low-temperature controlled atmosphere storage: The appropriate temperature can reduce the respiratory intensity of the fruit, effectively inhibit the activity of polyphenol oxidase and microbial activity. After longan harvest, it is pre-cooled and stored in plastic film or film. It is combined with drug preservation and cryopreservation. This is an effective method for longan storage. This method can play a role of self-regulation and change the content of carbon dioxide and oxygen. Inhibits the infestation of microorganisms and reduces the loss of spoilage. After 4 years of trial and error, Fujian Agriculture and Forestry University adopts thin-film large account with 0.1% sec-butylamine to cool fruit at low temperature. After 3 to 5°C temperature, after 40 days of preservation, the good fruit rate reaches 96%. Fruit appearance and flesh The quality is good, this preservation technology is simple and easy, and the effect is remarkable.
3. Sulfur preservation: Thailand's longan exports in recent years have been treated with smoked sulphur. The method is to burn 100g of 90% sulfur powder per cubic meter for 20-30 minutes. Sodium dithionite was used as a sulfur dioxide releasing agent, and good results were obtained at room temperature of 16 to 22 grams per 2 kilograms of longan. Longan is soaked with sulphite solution and has no effect on preservation. Slow release of sulphur is recommended to treat 6-8 g of sodium dithionite per kilogram of longan. For sulphur treatment, 20 g of sulphur per 10 kg of longan is fumigated for 20 minutes and stored at low temperature. In days, the good fruit rate was 96%, while the control was 0. Sulfur dioxide is effective in preventing browning of the peel and inhibiting the infestation of microorganisms. Under the sulphur-flavored longan fruits, peels without browning and disease can be maintained for 11 months (the peel has shrunk) at 10 or 5 degrees Celsius.
4. Modified atmosphere preservation: After longan harvesting, pre-cooling is performed for 2 days, and then the fruits are sorted out. After cutting off the inferior fruits and breaking the fruit, the ears are rinsed with 0.1% thiophanate-methyl to sterilize and directly weigh 0.04 mm. Thick polyethylene film bag, or first in a plastic turnover box, and then put on a plastic bag (thickness 0.04 mm), in the humidity of 85% ~ 95%, temperature 0 ~ 5 °C (not more than 10 °C) in the warehouse Storage. After pre-cooling, it is packed in plastic bags, then pumped and nitrogen-filled, and stored at 0 to 5°C or 6 to 10°C. The preservation effect is good. After 40 days of storage, the good fruit rate is still about 93%. . Pay attention to adjust the ratio of carbon dioxide and oxygen in the storage environment during storage. The gas content in the bag is preferably 6% to 8% oxygen and 4% to 6% carbon dioxide. When the concentration of carbon dioxide is higher than 13% or lower than 3%, it is unfavorable for longan storage, and it can also pump plastic bags, or pump nitrogen to accelerate the reduction of oxygen, which is beneficial to inhibit the respiration of longan fruits and is beneficial to long-term. Storage. Atmosphere storage is a kind of advanced storage technology which has developed rapidly abroad in recent years. However, there has not been a systematic and in-depth research report on the study of the controlled atmosphere storage of longan in China.
5. Boil preservation: This method is a traditional folk preservation method. Folks immerse the whole ear of fruit in boiling water for 30 to 40 seconds. It is not to scald the flesh, and it is lifted and hangs at the tuyere to dry. The treated fruit is left for 15 to 25 days, and the flesh is basically fresh and tastes sweeter. This method combined with modern preservation technology, that is, the fruits of blanching, drying and packing were placed in a 21°C cold storage and stored for 22 days. The good fruit rate reached 100%. The appearance color of the fruit is similar to that of the fresh fruit, and the endocarp is uniformly browned. The flesh flavor is normal. This result shows that the use of boiling water for 5 to 15 seconds, has a sterilizing effect, play a role in chemical treatment or physical treatment.
6. Quick-freezing and fresh-keeping: After selecting good fresh fruits and crack prevention treatment, the central temperature of longan fruits will be reduced to -30°C within one hour, and then stored in a cold storage at -18°C for a long time, and can be stored for one year or longer. time. The quick-freezing longan was removed from the low temperature of -18°C and treated with 0.5% citric acid plus 0.03% vitamin C solution or 1% citric acid solution, and the peel remained unchanged for 48 hours. The fruit can maintain its original appearance and inherent flavor with less loss of nutrients. When consumed, cold hydrolyze and eat immediately. This method is suitable for varieties with thicker skin, crispy meat and high sugar content. However, the disadvantage of adopting quick-freezing storage is that cracking of the longan is severe at the normal temperature.
Introduced several common longan storage technology, but can not ignore the key to its preservation. The fruit of the longan is crystal clear, nutritious, fresh flesh, sweet fruit juice, and pleasant flavor. However, the longan is matured under high temperature and high humidity conditions from August to September, and the physiological and biochemical changes of the live fruit are intense. The fresh fruit is easily discolored and deteriorated, and it is intolerant to long-distance transportation and long-term storage. At room temperature of 28[deg.] C., the fruit generally spoiled and deteriorated in one week. Proper low temperature conditions can prolong the longan's shelf life. Generally 2 to 3 °C, relative humidity 90% to 95% conditions, can be preserved 10 to 15 days. The use of a certain chemical agent and a combination of atmospheric conditioning factors for better storage, storage for 40 days, the fruit is still fresh and high quality, good taste good. Therefore, the key to storage and preservation of longan lies in antiseptic sterilization and prevention of physiological decline.
1. HCG Pregnancy Test is a rapid chromatographic immunoassay for the qualitative detection of human chorionic gonadotropin in urine or serum to aid in the early detection of pregnancy.
2.The One Step LH Urine Ovulation Test is fast and easy to use. It is a qualitative test that can predict when there is a LH (luteinizing hormone) surge, and in turn, when you are likely to ovulate.
Longan is a rare fruit that originates in the South Asian subtropical region of China. The longan cultivation industry in the world ranks first in China. Longan matures after litchi and is therefore extremely competitive in domestic and foreign fruit markets. In recent years, with the continuous improvement of people's living standards, the demand for high-quality fruits has continuously increased, and the production of longan has achieved rapid development. The storage and preservation technology of longan has become increasingly important. Therefore, the following describes several common longan storage and preservation methods:
Precaution
1. For in vitro diagnostic use only
2. This reagent is designed for the qualitative screening test. A confirmed pregnancy diagnosis should
be made only by a physician after all clinical and laboratory findings have been evaluated.
3. Do not use test kit beyond expiry date.
4. The test device should not be reused.
5. Do not use other kinds of quality control sample to test the reagent. Components of different
batches cannot be exchanged for use to avoid erroneous results