2% shelf life C2 treatment pulp hardness change of shelf life 2% CO2 the shelf life of fruits of weightlessness rate change/d shelf life 10% CO2 treatment pulp hardness change of shelf life 10% CO2 fruit weight loss rate of change is the main influence factors of fruit water loss.
2。
The shelf life of 2 different concentrations (1) 2 Fuji apple Vc of refrigeration, 100 g storage shelf life after the influence of Vc were presented significant decline, 14 d as control group to 44.
%。
Storage under 20 * C well keep the fruit of Vc content, 10% C2 when handling group at 14 d Vc content remains in 63.
100克。
Combined with 20 c 10% CO2 storage can better maintain the fruit hardness, delay the Vc is reduced, to maintaining the quality of frozen Fuji apple have certain effect.
2。
The shelf life of 3 different concentrations 0 * affect refrigeration Fuji apple IEC used syringes from the stone of the fruit take 1 ml gas in the cavity injection GC spectrum from shimadzu column for SE - elastic quartz capillary column (54
30mX 0.
25毫米)
, hydrogen flame detector (
FID）
。
Injection port temperature is 100 c column temperature is 70 c detector temperature of 150 c to ethylene gas calibration standard.
With N2 as carrier gas, H2, and air as gas of FID, the intake rate of 25 ml/min respectively and 400 ml/min.
Peak appearing time later than the control group, 2% CO2 treatment in 20 c storage 10 d, a peak in IEC, 283 ml storage temperature showed that 20 c, 10% CO2 can to a certain extent, inhibit the synthesis of ethylene;
4.
Treatment group 4 * C, 2% CO2 in ethylene peak of 101 had a 7 d.
45毫升。
L * 1, 10 % CO2 treatment group had no significant ethylene peak, show that 4.
4 c storage temperature, 10% CO2 for the delay of ethylene peak appeared is having some effect.
2。
4 the shelf life of the influence of different concentration CO2 Fuji apple MDA of refrigeration, plant organs aging or suffer damage under adversity, often happen membrane lipid peroxidation.
Membrane system due to the attack of oxygen free radicals and permeability, causing ion exosmosis and membrane lipid peroxide malondialdehyde generate metabolites.
Usually the accumulation of malondialdehyde situation as an important indicator of measuring cell membrane damage 15.
By you can see, 10, malondialdehyde slowly accumulate at the beginning, after rising trend, the irreversible damage cell membranes.
MDA content has been below 2% CO2 treatment group, treatment group 10% CO2 in 4.
4 C MDA content is higher than that of control, less accumulation of 20 * C.
The results showed that 2% 10% CO2 under CO2 treatment and 20 c shelf life 2% CO2 treatment the shelf life of fruits of IEC change 10% C2 the shelf life of fruits of IEC change the shelf life of fruits of C2 processing Vc change 10% 2% C2 treatment the shelf life of the fruit of Vc change 2% C2 MDA content change the shelf life of 0 10% the MDA content of C2 processing can change the principle in a certain extent, inhibit membrane lipid peroxidation;
In 4.
4 c 10% CO2 under processing can big damage degree of the cell membrane, accelerate fruit senescence.
44 * C, under the condition of low temperature 0 ° storage 60 d Fuji apple with 10% CO2 has certain sensitivity.
Appropriate CO2 concentration inhibits the rise of MDA content, in general, the higher temperature will accelerate the aging of the fruit, lead to the MDA content.
10% C2 treatment can effectively inhibit 20 c of the adverse impact of high temperature on fruit, reduce the accumulation of membrane lipid peroxide.
3 discuss apple in different stages of storage should be adopted different technical indicators.
studies have confirmed that under the high temperature after apple picking with higher C2 concentration, and with time changing its effect is better than that of cold storage method m close to standard gas 6 丨.
X inches refrigerated 2 months of Fuji apples in 4.
4, 20 * c were 2%, 10%, C2 treatment under 14 d shelf life test, the result table tip the same high concentration C2 processing, fruit in 4.
4 * C conditions than under 20 * C are more likely to appear the symptom of aging, quality decline, showed the refrigerated Fuji apple to C2 tolerated with temperature increase with the rising of, may be C2 solubility in the pulp cells grow in low temperature, high concentration of C2 cell damage caused by the physiological disorder, cause harm to the Fuji apple.
After compared with anatomical analysis, tasting that fruit not directly damage the CCh.
C2 concentration must be, can reduce the concentration of 2 add to the Fuji apple C2 hurt 11, and Fuji apple for high sensitivity is greater than 2 C of low sensitivity of 2 'the experiment 2 concentration control in 16% plus or minus 0.
5%, so the harm from happening to C2 has played a certain inhibition.
C2 damage potential remains to be further test.
2 damage sensitivity change is decided to Fuji apple!
An important factor t hide the best air condition.
20 ° C + 10% under the condition of C2, all sorts of physiological response to slow, shows that high temperature combined with high CO 2 treatment on pulp tissue twist's adversity stress resistance aspect has certain regulation, can delay the rapid aging of the fruit.
High C2 inhibitory effect on the maturity and senescence of the fruit, it as same as the effect of low temperature, and high C2 can take the place of low temperature, as the shelf life of Fuji apple e after the MAP (
Spontaneous air small package)
Provide technical support.
different varieties of apples on the C2 tolerance has great difference, variety of C2 is sensitive,
Such as Fuji apple)
Often because of C2 losses and make the goods damage.
As a result, high C2 processing also has its limitations.
Are widely used in the production, need hills per ha C2 processing to the various varieties of apples the best treatment concentration and the time needed for system thorough test to grind Gui & gt;
To give full play to the role of this storage method.
