Method for determining rancidity of soybean phospholipid oil
A technology of soybean phospholipid oil and soybean oleic acid, applied in the field of analysis and detection, can solve the problems of soybean phospholipid oil rancidity, low acid value, rancid smell, etc., and achieves the effects of reliable data and simple operation.
Active Publication Date: 2019-01-04
广东百美倚德生物科技有限公司
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Problems solved by technology
[0003] The common method for judging the degree of rancidity of soybean lecithin oil is to measure its acid value, and the manufacturer adds alkaline substances to neutralize it in its processing engineering, so that its acid value is low, but in fact soybean lecithin oil may have become rancid
Under normal circumstances, we only test the acid value of soybean lecithin oil to judge whether it is rancid, but the acid value of neutralized soybean lecithin oil cannot be used to judge whether it is rancid, and the smell is indeed rancid.
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Embodiment 1
[0025] 1. Sample preparation
[0026] Get 100g of soybean lecithin oil (moisture: 60.0%; impurity < 1.0%; crude fat ≥ 95.0%) freshly produced by a large oil factory (China Grain Reserve Management Corporation), and the code is A;
[0027] Take 100g of soybean lecithin oil (moisture60.0%; impurity<1.0%; crude fat≥95.0%) that has been stored for more than two years and has a sour taste from Dongguan Fuzhiyuan Feed Protein Development Co., Ltd., coded as B;
[0028] Take the oil foot (moisture: 60-70%; neutral oil 20-30%; phospholipid 30-45%; impurity 55.0%; impurities < 1.0%; crude fat ≥ 95.0%), take 100g, coded as C.
[0029] 2. Separation
[0030] (1) Preparation of powdered phospholipids: Weigh 2 g of phospholipids in a 50 mL beaker, add 10 mL of petroleum ether (boiling range 60-90° C.) to dissolve, add 25 mL of acetone, and precipitate the phospholipids.
[0031] (2) Preparation of saturated acetone: Take 1g of powdered phospholipids in a 1000mL ground-mouth bottle, add...
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The invention belongs to the field of analysis detection, and discloses a method for determining the rancidity of soybean phospholipid oil. The method mainly comprises the following steps that 1, soybean oil in the soybean phospholipid oil is separated from phospholipid in the soybean phospholipid oil; 2, the acid value of the soybean oil and the acid value of the phospholipid are determined respectively; 3, the acid value of the soybean oil is compared with the acid value of the phospholipid, and the total acid value of the soybean phospholipid oil is determined, wherein when the total acid value of the soybean phospholipid oil is higher than 35 mg KOH / g, the soybean phospholipid oil has been rancid; when the total acid value of the soybean phospholipid oil is equal to or lower than 35 mgKOH / g, the acid value of the soybean oil is compared with the acid value of the phospholipid; when the acid value of the soybean oil is larger than or equal to the acid value of the phospholipid, thesoybean phospholipid oil has been rancid; when the acid value of the soybean oil is lower than the acid value of the phospholipid, the soybean phospholipid oil is not rancid. The method for determining the soybean phospholipid oil is simple in operation, and the result data is reliable.
Description
technical field [0001] The invention belongs to the field of analysis and detection, in particular to a method for judging the actual rancidity degree of soybean lecithin oil. Background technique [0002] The quality of soybean phospholipid oil on the market is uneven. Many small oil factories buy oil feet from large oil factories and process them by themselves, but the oil feet contain about 60% water, and the phospholipids will become rancid when exposed to water for 8 hours, and the speed of rancidity It is very fast, and they cannot be processed within 8 hours, so in order to reduce the acid value of soybean lecithin oil, alkaline substances are added to neutralize the acidity, such as calcium carbonate. [0003] The common method for judging the degree of rancidity of soybean lecithin oil is to measure its acid value, and the manufacturer adds alkaline substances to neutralize it during its processing, so that its acid value is low, but in fact soybean lecithin oil may...
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IPC IPC(8): G01N33/03G01N21/25
CPCG01N21/25G01N33/03
Inventor 钟焕均吴永辉练海明赵朝阳高振南张玲
Owner 广东百美倚德生物科技有限公司