Salted Kelp Knots
The original ecological kelp means that we pack the young kelp with saturated salt water directly after washing without any preservatives.Original ecological products are the favourite of housewives.
Salted kelp:
How to eat:
The difference between deep sea kelp and traditional ordinary kelp
Nutrational Effects
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Second, the experimental series freeze-drying machine classification experiment series of freeze-drying machine pursuit of performance indicators are small size, light weight, multi-function, stable performance, high test system accuracy, Zui is a multi-purpose machine, can adapt to a variety of materials Freeze-dried experiments. The main division methods of the experimental series of freeze dryers are:
1. From the structure, the bell-shaped freeze-drying machine: the freeze-drying chamber and the cold trap are separate upper and lower structures, and the freeze-drying chamber has no pre-freezing function. This type of lyophilizer requires manual manipulation when it is transferred to the drying process after the material has been pre-frozen. Most of the experimental freeze dryers are bell-type, which has a simple structure and low cost. Most of the freeze-drying chambers use a transparent plexiglass cover to facilitate the observation of the lyophilization of the material.
l In-situ lyophilizer: The lyophilization chamber and the cold trap are two independent chambers. The shelf in the lyophilization chamber has a cooling function. After the material is placed in the lyophilization chamber, the material is pre-frozen and dried without manual manipulate. This type of freeze dryer has a complicated manufacturing process and high manufacturing cost. However, the in-situ freeze dryer is the development direction of the freeze dryer, and is an ideal choice for lyophilization process, especially suitable for medicine, biological products and other special products. Freeze-dried.
a, ordinary type b, multi-manifold type c, gland type 2, from the function of ordinary shelf type: material bulk in the material tray, suitable for lyophilization of food, Chinese herbal medicine, powder materials.
With gland type: It is suitable for the drying of the bottled material of Xilin. When the preparation is frozen, the material is packed into the vial as needed. After the cap is floated, it is freeze-dried. After the drying, the capping mechanism is pressed to tighten the cap. It can avoid secondary pollution, re-adsorb moisture, and is easy to store for a long time.
Multi-manifold type: The flask is attached to the outside of the drying chamber, and the material frozen on the inner wall of the bottle is dried. At this time, the flask is connected as a container to the manifold outside the drying box, and the material in the flask is heated at room temperature, and the mixture is heated. The tube switch device can be removed or loaded at any time as needed without stopping the machine.
With pre-freezing function type: material pre-freezing process, cold trap as pre-freezing chamber pre-freezing material, in the drying process, the cold trap is a water trap to capture the moisture overflowing the material. The freeze-drying machine with pre-freezing function, the pre-freezing and drying of the materials in the freeze-drying process are all completed on the lyophilizer, and the lyophilizer has high use efficiency, which saves the use of the low-temperature refrigerator.
Third, several parameters should be paid attention to when purchasing the freeze dryer 1. The number in the freeze-drying machine model represents the freeze-drying area of ​​the freeze dryer. For example, freeze-drying of the LGJ-18C freeze dryer The area is 0.18m2. The user should calculate the lyophilizer for the lyophilized area according to his own needs. For example, for each batch of products that require lyophilization of 1.8 kg (liter) of liquid, and loading the material with a material tray, each loaded with 10 mm thick, the load area of ​​the lyophilized layer can be calculated:
A (area, m2) = V (volume, m3) / H (height, m) = 0.0018 m3 / 0.01 m = 0.18 m2
A lyophilizer with a lamellar load area of ​​0.18 m2 is required.
2. Cold trap temperature The cold trap is a device for capturing moisture in the freeze-drying process. Theoretically, the lower the temperature of the cold trap, the stronger the water trapping capacity of the cold trap, but the lower the temperature of the cold trap, the higher the requirements for refrigeration, the cost and operation of the machine. High cost. The cold trap temperature of the experimental series freeze dryer mainly has several grades of about -45 °C, -60 °C, and -80 °C. Freeze-drying at -45°C is suitable for some products that are easily lyophilized. The lyophilizer with a cold trap temperature of around -60°C is suitable for lyophilization of most products, and lyophilization with a trap temperature of -80 °C. Suitable for lyophilization of some special products. The effect of cold trap temperature on water-trapping capacity shows that the temperature of the cold trap drops from -35 °C to -55 °C, and the water-trapping capacity is obviously improved. The cold trap temperature is lower than -55 °C, and the water trapping capacity of the cold trap is not significantly improved. Therefore, in the absence of special needs, the choice of cold trap temperature -60 ° C is the ideal choice. The cold trap temperature of the LGJ-10D freeze dryer in the four-ring freeze dryer is ≤-55 °C, and the freeze dryer temperature of the LGJ-18 series and LGJ-25 series is ≤-60 °C, and the refrigerant is mixed with mixed refrigerant. The technology, in the case of the same refrigeration unit, has a low cooling temperature, a large cooling capacity, a high operational stability, and a low failure rate. The four-ring lyophilizer also includes the LGJ-10 freeze dryer with cold trap temperature ≤ -45 ° C, suitable for lyophilization of some easily lyophilized products. The cold trap temperature of LGJ-50C freeze dryer is ≤-80 °C, which is especially suitable for lyophilization of medicines and special products.
3. The cooling rate of the cooling rate reflects the cooling capacity of the refrigeration system. Under no-load conditions, the temperature of the cold trap should reach the low temperature specified by the index within 1 hour. For example, a lyophilizer with a cold trap temperature ≤ -60 ° C, the machine starts from the time of opening the refrigeration, and the cold trap temperature reaches -60 ° C for no more than 1 hour.
4. Ultimate vacuum The ultimate vacuum reflects the leakage of the freeze dryer and the pumping efficiency of the vacuum pump. The degree of vacuum of the freeze-drying box, the past view that the higher the degree of vacuum, the better, the current view that the degree of vacuum should be within a fair range. The degree of vacuum is too high, which is not conducive to heat transfer, but the drying speed is reduced, but the vacuum limit of the freeze-drying box should reach 15Pa or more.
5, vacuum pumping time The emptying speed of the freeze-drying box should be pumped from atmospheric pressure to 15Pa within half an hour.
6, the layer temperature uniformity and flatness:
The uniformity and flatness of the lamellar temperature have a great influence on the uniformity of product quality. The better the temperature uniformity and the flatness, the better the uniformity of the quality of the freeze-dried product. The lyophilizer shelf temperature control has a heater type and an intermediate fluid type, and the freeze-drying machine shelf with the intermediate fluid control plate layer has uniform temperature uniformity and flatness, and the lyophilizer layer is a hollow sandwich structure, the slab layer The cooling and heating are achieved by circulating the intermediate fluid in the fluid channel inside the ply, so the temperature of the ply is uniform. The LGJ-50C freeze dryer in the four-ring freeze dryer uses the technology of the intermediate fluid in the shelf. The shelf temperature control of the bell-type lyophilizer is basically a heater, and the temperature uniformity of the plate layer is slightly poor. However, in general, the temperature difference of the lyophilizer for medical use should be controlled at ±1.5 °C, the temperature difference within the plate is ±1 °C, and the food freeze dryer can be appropriately relaxed.
7. Control system The type and function of the control system of the freeze dryer are different. For the freeze dryer of the experimental series, it is mainly used for the lyophilization process of materials and a small amount of trial production. Therefore, the control system should display the parameters of the freeze-drying process in real time and record automatically; set, modify and effectively execute the freeze-drying process program; have a communication interface to facilitate data collection and storage.
Four-four-ring freeze-drying machine features The four-ring freeze-drying machine is manufactured according to the technical parameters of the medical freeze dryer, and is suitable for various fields. The table below lists the main performance parameters of some models of the four-ring freeze dryer.
Table 1 Performance parameters of the four-ring freeze dryer Machine model shelf area cold trap temperature cooling rate limit vacuum LGJ-10 series 0.1m2 ≤ -55 ° C ≤ 60 minutes ≤ 13Pa
LGJ-18 series 0.18m2≤-60°C≤60 minutes≤13Pa
LGJ-25 series 0.25m2 ≤ -60 °C ≤ 60 minutes ≤ 13Pa
LGJ-50C0.5m2≤-80°C≤60 minutes≤13Pa
The four-ring freeze-drying machine is designed and manufactured with the concept of “focus on quality, attention to detail, people-oriented, customer firstâ€, and continuously innovates and manufactures the experimental freeze dryer. The four-ring freeze dryer has many excellent features:
1. High-efficiency, energy-saving and environmentally-friendly refrigeration system The refrigeration unit of all products of the four-ring freeze-drying machine adopts high-quality imported compressor unit, and uses environmentally-friendly mixed working medium with independent intellectual property rights. The refrigeration capacity of the freeze dryer is large, and the cooling speed is fast. Strong water capacity, stable and reliable work, low failure rate. Compared with the refrigeration system of the same type and the same unit, the refrigeration system of the four-ring freeze dryer has high efficiency and low power consumption. At no-load, the time required for the trap temperature to reach the specification is less than 1 hour.
2. The shelf temperature uniformity and flatness are good. The LGJ-50C freeze-drying machine adopts the laminar intermediate fluid technology, and the lyophilizer shelf layer has uniform temperature and flatness. The shelf of the bell-type lyophilizer of the four-ring lyophilizer adopts new technology and new materials, and solves the problem of flatness of the shelf and poor uniformity of temperature. The shelf heating uses aerospace heating film, and through the heat flow calculation, the special heating film for the lyophilizer layer is designed to improve the shelf temperature uniformity. Due to the improvement of the heater, the shelf structure is applied to replace the flange structure, and the flatness of the shelf layer is greatly improved. The temperature control of the lamellar layer is controlled by layer temperature, and the temperature difference between the plies is small, which ensures the consistency of the quality of the dried product. The layer temperature control uses the fuzzy PID algorithm, and the shelf temperature control has high precision and stability.
3, stable and reliable, maneuverable, user-friendly control system graphics LCD as a human-machine interface, display content including equipment operating status, freeze-drying parameters real-time data, freeze-drying process curve display and other rich content. Provide RS232 interface for communication with the host computer, equipped with powerful PC software. The upper computer software can monitor the equipment, realize the modification, uploading and downloading of the freeze-drying process program, and save, browse and print the parameter data of the freeze-drying process. The RS232 interface can be converted to a 485 interface via a converter to achieve remote interval monitoring, which brings great convenience for scientific research and equipment manipulation.
4, cold trap smooth, water-capacity cold trap using 304 stainless steel material, the refrigeration coil is wrapped around the outside of the cold trap, the inner wall of the cold trap is polished, the surface of the cold trap is smooth and easy to clean. The fluid model is used to design the inlet and the suction port position of the cold trap, effectively controlling the gas flow path, ensuring that the cold trap efficiently captures water and improves the water catching efficiency.
5, the appearance is beautiful and generous, using ABS as the outer shell material, the outer shell is integrally blistered, the whole machine is compact, and the appearance is beautiful and generous. The machine is moderately sized and easy to handle.
6, high-quality products in the country only one by one developed a laboratory-type freeze dryer enterprise standards, and through the medical device inspection, the indicators meet the requirements. The LGJ-18 series intelligent freeze dryer was recognized as a high-tech product by Beijing, and was awarded the Beijing Zhongguancun Science Park Innovation Fund, and was listed as a key new product project by the state.
Introduction to the idea of ​​purchasing vacuum freeze dryer
I. Introduction Freeze-drying is a method in which a water-containing substance is pre-frozen into a solid state, and then the water therein is sublimated from a solid state into a gaseous state under vacuum to preserve the substance in addition to moisture. The articles obtained by the drying method have the original chemical and biological properties, are easy to be preserved for a long time, can be restored to the form before lyophilization after adding water, and can maintain their original biochemical characteristics, which is a high-quality drying. method. The main uses of modern freeze-drying technology are: freeze-drying and storage of in vitro biological tissues; freeze-drying preservation of live bacteria; lyophilization of Chinese herbal medicines, western medicines, biological drugs and blood products; convenience foods, health foods, functional foods Freeze-drying storage and transportation; lyophilization preparation of nano-ceramic materials and various metal micro-powder materials. Therefore, freeze-drying technology has been widely used in the fields of chemicals, food, materials, medicine, and biological products. Vacuum freeze dryer (referred to as freeze dryer) is a device for realizing freeze-drying technology. It is a complex structure machine involving refrigeration, vacuum, thermal, mechanical, fluid, electrical control and pressure vessels. know how. Therefore, when users purchase freeze-drying equipment, they often encounter many problems. From the perspective of the user, the author mainly introduces the selection technology of some experimental series freeze dryers.