Method for detecting acid value of vegetable oil containing oryzanol

A technology of vegetable oleic acid and detection method, applied in the field of vegetable oil detection, can solve the problems of color interference, difficulty in observing indicator discoloration, difficulty in judging the titration end point, etc., to achieve the effect of improving accuracy

Inactive Publication Date: 2015-03-25
SHANDONG SANXING CORN IND SCI CO LTD
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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for detecting the acid value of vegetable oils containing oryzanol, which overcomes the interference of the color of oryzanol contained in the oil during the titration of the acid value of vegetable oils containing high oryzanol and makes it difficult to observe the discoloration of the indicator, that is, it is difficult to judge Titration endpoint problem

Method used

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Embodiment 1

[0030] Oil samples: corn oil without oryzanol (oil sample 1), corn oil with oryzanol content 1700mg / kg (oil sample 2), corn oil with oryzanol content 5000mg / kg (oil sample 3), oryzanol content 8000mg / kg corn oil (oil sample 4), oryzanol content 10000mg / kg corn oil (oil sample 5), oryzanol content 15000mg / kg corn oil (oil sample 6), oryzanol content 17000mg / kg corn oil (oil sample 7), oryzanol content 19000mg / kg corn oil ( Oil sample 8), oryzanol content 20000mg / kg corn oil (oil sample 9).

[0031]Reagent: the preparation method of potassium hydroxide-ethanol standard solution comprises the following steps: take by weighing 7.5-8g of potassium hydroxide, place it in a polyethylene container, add 6-7ml of water to dissolve, dilute to 1000mL with 95% ethanol, Place it airtightly for 24 hours, siphon the supernatant liquid into another polyethylene container with a plastic tube; weigh 0.75g of the working standard reagent potassium hydrogen phthalate and dry it in an electric oven...

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Abstract

The invention discloses a method for detecting the acid value of vegetable oil containing oryzanol. The method comprises the steps that the following mixed dissolved solutions are used for dissolving a vegetable oil sample containing the oryzanol, wherein diethyl ether and ethyl alcohol with the concentration being 95% are mixed according to the volume ratio of 1:1, before using, 0.1mL of alkali blue-ethyl alcohol indicating liquid is added in every 100 mL of the above mixed solvent of the diethyl ether and the ethyl alcohol, and a KOH standard solution is used for accurately neutralizing the solution to be in the slight red color; 1-2 drops of alkali blue-ethyl alcohol are used as the indicating liquid, a potassium hydroxide- ethyl alcohol standard solution is used as a titrating solution, and a titrimetric method is used for detecting the acid value of the vegetable oil containing the oryzanol. The method solves the problem that the determination of titration end-point is influenced due to the color disturbance of the oryzanol in the vegetable oil with high oryzanol content. According to the method, the titration end points are observed and cleaned accurately, and the accuracy of the acid value detecting is improved. The method can be widely applied to acid value detecting of the vegetable oil with the high oryzanol content.

Description

technical field [0001] The invention belongs to the technical field of vegetable oil detection, and in particular relates to a method for detecting the acid value of oryzanol-containing vegetable oil. Background technique [0002] The acid value of oil refers to the number of milligrams of potassium hydroxide required to neutralize the free fatty acids in 1g of oil. Acid value is an important indicator for edible oil quality evaluation and product safety restrictions, and is also the basis for calculating the amount of alkali used for alkali refining and deacidification of oil, the degree of oil refining and the change of storage quality. Therefore, the determination of oil acid value plays a very important role in practical work. [0003] The acid value of oil is related to the raw materials for oil production, oil production and processing technology, oil storage and transportation methods and storage conditions. For example: the acid value of mature oil seeds to produce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79G01N1/38
Inventor 王月华王萍程芳园王秀华
Owner SHANDONG SANXING CORN IND SCI CO LTD
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