Method for preparing low erucic acid fragrant rapeseed oil
Disclosed is a method for preparing a low erucic acid fragrant rapeseed oil. The method includes subjecting a double low rapeseed to aroma-generating treatment, to obtain an aroma-generated rapeseed, the double low rapeseed including lower than 3 wt % of erucic acid, lower than 45 μmol/g of total glucosinolates, 6-15 μmol/g of 3-butenyl glucosinolate, and 0.4-2.0 μmol/g of 4-methylthiobutyl glucosinolate; mechanically squeezing the aroma-generated rapeseed, to obtain a crude oil; and degumming the crude oil, to obtain the low erucic acid fragrant rapeseed oil.
1 . A method for preparing a low erucic acid fragrant rapeseed oil, comprising steps of
subjecting a double low rapeseed to aroma-generating treatment, to obtain an aroma-generated rapeseed, wherein the double low rapeseed contains lower than 3 wt % of erucic acid, lower than 45 μmol/g of total glucosinolates, 6-15 μmol/g of 3-butenyl glucosinolate, and 0.4-2.0 μmol/g of 4-methylthiobutyl glucosinolate;
mechanically squeezing the aroma-generated rapeseed, to obtain a crude oil; and
degumming the crude oil, to obtain the low erucic acid fragrant rapeseed oil.
2 . The method as claimed in claim 1 , wherein the aroma-generating treatment comprises pressure aroma-generating treatment, microwave aroma-generating treatment, or stir-frying aroma-generating treatment.
3 . The method as claimed in claim 2 , wherein the aroma-generating treatment is the pressure aroma-generating treatment, and the pressure aroma-generating treatment is performed at a temperature of 140-200° C. and a pressure of 0.7-1.0 MPa for 1-5 minutes.
4 . The method as claimed in claim 2 , wherein the aroma-generating treatment is the microwave aroma-generating treatment, and the microwave aroma-generating treatment is performed at a microwave power of 400-1200 W for 4-12 minutes.
5 . The method as claimed in claim 2 , wherein the aroma-generating treatment is the stir-frying aroma-generating treatment, and the stir-frying aroma-generating treatment is performed at a temperature of 140-200° C. for 20-40 minutes.
6 . The method as claimed in claim 1 , wherein the aroma-generated rapeseed has a water content of 3-5 wt %.
7 . The method as claimed in claim 1 , wherein mechanically squeezing the aroma-generated rapeseed is performed at a temperature of 130-160° C., with a processing capacity of 5 kg/(5-30) minutes, and mechanically squeezing the aroma-generated rapeseed is performed by using a mechanical squeezer at a current of 0.5-20 A.
8 . The method as claimed in claim 1 , wherein a degumming agent used for the degumming is silicon dioxide; and
the degumming agent is in an amount of 0.2-2% of a mass of the low erucic acid fragrant rapeseed oil.
9 . The method as claimed in claim 1 , further comprising after the degumming, subjecting a degummed oil obtained from the degumming to natural sedimentation and solid-liquid separation, to obtain a liquid component of the low erucic acid fragrant rapeseed oil, wherein the natural sedimentation is performed at room temperature for 24-48 hours.
10 . The method as claimed in claim 8 , further comprising after the degumming, subjecting a degummed oil obtained from the degumming to natural sedimentation and solid-liquid separation, to obtain a liquid component of the low erucic acid fragrant rapeseed oil, wherein
the natural sedimentation is performed at room temperature for.
11 . The method as claimed in claim 2 , wherein the aroma-generated rapeseed has a water content of 3-5 wt %.
12 . The method as claimed in claim 3 , wherein the aroma-generated rapeseed has a water content of 3-5 wt %.
13 . The method as claimed in claim 4 , wherein the aroma-generated rapeseed has a water content of 3-5 wt %.
14 . The method as claimed in claim 5 , wherein the aroma-generated rapeseed has a water content of 3-5 wt %.