- Hara and Radin methods : A method that uses a mixture of hexane and isopropanol(이소프로판올)
몸에 해로운 hexane and isopropanol (헥산, 이소프로판올)
주의 ; 몸에 이로운 핵산 [뉴클릭 에시드 nucleic acid] 과 다름,
^^Hexane and isopropanol are harmful to humans,
Yes, both hexane and isopropanol can be harmful to humans, particularly when exposed to high concentrations, as they can irritate the skin, eyes, and respiratory system, and in severe cases, can cause damage to the nervous system through inhalation exposure; hexane is especially known for its potential to cause peripheral neuropathy (nerve damage in the extremities) with prolonged exposure.
Key points about their potential harm:
Hexane:
- Main concern: Can cause nerve damage, leading to numbness, tingling, and weakness in the hands and feet, particularly with repeated exposure through inhalation.
Exposure routes: Primarily through inhalation, but can also be absorbed through the skin.
Isopropanol (Isopropyl Alcohol):
Important considerations:
- Proper handling:
Always wear appropriate personal protective equipment when handling hexane or isopropanol, including gloves, goggles, and respiratory protection when necessary.
- Ventilation:
Ensure good ventilation when using products containing these chemicals to minimize inhalation exposure.
- Read safety data sheets:
Always consult the safety data sheet for specific information on handling and potential hazards associated with each chemical.
The "Hara and Radin method" refers to a specific lipid extraction technique used in research, particularly for extracting lipids from microalgae, where a mixture of hexane and isopropanol (typically in a 3:2 ratio) is used to homogenize and extract the lipids from the sample; it is named after the researchers who developed it, Hara and Radin.
Key points about the Hara and Radin method:
Solvent mixture:
The primary feature of this method is the use of a hexane: isopropanol mixture, which effectively dissolves a wide range of lipids.
Application in microalgae research :
This method is often used in studies analyzing lipids from microalgae, a potential source of biofuel.
Procedure :
Typically, a sample of microalgae biomass is mixed with the hexane:isopropanol solution, homogenized, and then the lipid-containing phase is separated for further analysis
- Liquid-liquid extraction : A method that uses ammonium hydroxide and ethyl alcohol to solubilize the powder, followed by ethyl ether and petroleum ether as extraction solvents
- Accelerated solvent extraction (ASE) : A method that uses solvent mixtures to extract fat from milk products,
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The standard milk fat extraction methods, such as the Röse-Gottlieb (ISO, 2001), using a mixture of diethyl ether and n-pentane, as well as the method based on extraction with a mixture of hexane:isopropanol proposed by Hara and Radin (1978), give satisfactory results for neutral lipid extraction but they present ...
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What is used to remove fat from milking equipment?
*The alkaline detergent breaks up any remaining milk fat into tiny droplets, suspending the fat in the detergent wash water. *The chlorine increases the solubility of any remaining protein and helps to remove it with the detergent wash during the wash cycle.
Is alkaline detergent harmful in humans?
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What is the stripping method of milking?
Milking is done either by stripping or by full hand method. Stripping is done by firmly holding the teat between the thumb and fore finger and drawing it down the length of the teat and at the same time pressing it to cause the milk to flow down in a stream.
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우유의 지방을 추정하는 데 사용되는 방법은 무엇입니까?
Which method is used for estimation of fat in milk?
The Gerber method;
The Gerber method consists of separating and measuring the fat contained in milk or its derivatives. It was developed in 1892 and is still used for its speed and accuracy.
The fat percentage scale of the products to which this method is applied is between 0 and 16% fat.