CN106070550A - A kind of compound colour-keeping liquid being dried for Arillus Longan and drying means - Google Patents

A kind of compound colour-keeping liquid being dried for Arillus Longan and drying means Download PDF

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Publication number
CN106070550A
CN106070550A CN201610564696.XA CN201610564696A CN106070550A CN 106070550 A CN106070550 A CN 106070550A CN 201610564696 A CN201610564696 A CN 201610564696A CN 106070550 A CN106070550 A CN 106070550A
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arillus longan
longan
drying
dried
keeping liquid
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CN106070550B (en
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秦文
张清
李光惠
林德荣
李素清
刘耀文
陈洪
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Sichuan Agricultural University
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Sichuan Agricultural University
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    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B7/00—Preservation or chemical ripening of fruit or vegetables
    • A23B7/02—Dehydrating; Subsequent reconstitution
    • A23B7/022—Dehydrating; Subsequent reconstitution with addition of chemicals before or during drying, e.g. semi-moist products

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Wood Science & Technology (AREA)
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  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Storage Of Fruits Or Vegetables (AREA)

Abstract

The present invention discloses a kind of compound colour-keeping liquid being dried for Arillus Longan and drying means, described colour-keeping liquid is made up of following component by mass percentage: ascorbic acid 0.05%～0.15%, malic acid 0.06%～0.10%, calcium chloride 0.10%～0.30%, sodium bicarbonate 0.10%～0.30%, surplus is water；Described drying means is: fresh Arillus Longan is carried out beta pruning and selects classification, to the fresh blunt enzyme of Arillus Longan blanching after classification, puts into color retention in described colour-keeping liquid through the Arillus Longan of blanching, the Arillus Longan after color retention is carried out hot air drying.The compound colour-keeping liquid that the Arillus Longan of the present invention is dried, the browning reaction during effectively suppressing Arillus Longan drying, reduce Arillus Longan loss of nutrient substance during drying, effect of color protection is good, nonhazardous, safety operation high, convenient.

Description

A kind of compound colour-keeping liquid being dried for Arillus Longan and drying means
Technical field
The invention belongs to garden stuff processing technical field, specifically, relate to a kind of compound colour-keeping liquid being dried for Arillus Longan, Further relate to a kind of dried longan drying method.
Background technology
Arillus Longan (Dimocarpus longan Lour.) is Sapindaceae Euphoria fruit tree, and its fruit is rich in carbon hydrate Thing, aminoacid, vitamin.Arillus Longan is plucked in high temperature season, and post-harvest physiology metabolism is vigorous, easily rotten rotten, loses edible valency Value.The economic loss brought to reduce Arillus Longan easily to rot and the edibility of increase Arillus Longan, the side that the most employings are dried Fresh Arillus Longan is made dry Arillus Longan (Arillus Longan) by method.In recent years, the development of the dry technology of Arillus Longan is very fast, about vacuum lyophilization, The research of infrared drying, microwave drying and combined drying is more, but at present still with relatively low to equipment requirements in actual production Hot air drying and sheet using super-heated steam are main.Easily there is brown stain in Arillus Longan during drying, reduces the sense organ product of Arillus Longan Matter, have impact on the commodity value of Arillus Longan.
Causing Arillus Longan to go bad, to lose the main cause of edibility be brown stain, according to the difference of Browning Mechanism, can be divided into enzyme Promote brown stain and the big class of non-enzymatic browning two.Enzymatic browning is Arillus Longan shell under the influence of extraneous heat drying condition or mechanical damage Destroyed, the organization internal that enters in a large number of oxygen have activated the effect of enzyme, is catalyzed the oxidation of in-house aldehydes matter and generates quinones, Quinones repolymerization forms the brown material causing tissue variable color.In complete Arillus Longan histiocyte, as breathing transmission material Aldehydes matter between phenol-quinone, remain dynamic equilibrium.Pericarpium Longan is once destroyed so that air can directly and sarcocarp Contact, polyphenols is oxidized to o-quinone under the existence of oxygen and the catalytic action of enzyme material, and trihydric compounds is neighbour It is oxidized to hydroxyquinone under the Strong oxdiative ability of quinone, becomes brown after red hydroxyquinone is aggregated, and then become pitchy, from And cause longan pulp brown stain variable color.Arillus Longan drying advance row color retention, it is possible to the generation of effective Restrain browning, alleviates dragon The eye deformation of sarcocarp, atrophy.
The colour-keeping liquid commonly used now is mainly for longan pulp color retention, and need to shell Arillus Longan etc. process, pin The color retention research being dried Arillus Longan band shell is few.And normally used colour-keeping liquid is divided into two kinds, the first contains SO2's Salt, if sodium sulfite, sodium pyrosulfite and sodium sulfite etc. are that a class commonly uses antistaling agent, can be at inhibitory enzyme under low concentration Activity, thus suppress enzymatic browning, SO2Can close with the oxidation in organic peroxide makes it not generate hydrogen peroxide, then peroxide Compound enzyme POD just loses Oxidation, simultaneously SO2Can be combined with the ketone group of tannin again, make tannin not made PPO, POD lose by oxidation Remove substrate specificity, thus stop enzymatic browning, the diluted acid environment that additionally bisulfites produces, make the carbonyl ammonia of Maillard reaction contract Close product easily to hydrolyze, thus inhibit the non-enzymatic browning caused by Maillard reaction.But SO2Residual health is had Potential safety hazard；The second is non-sulfur prevention of discoloration, and this color fixative mode commonly uses citric acid, ascorbic acid, malic acid etc. as color fixative composition, Mainly act on polyphenol oxidase, improve the organoleptic quality of fruit and vegerable simultaneously, but effect of color protection inconspicuous.
Summary of the invention
In view of this, the present invention is directed to above-mentioned problem, it is provided that a kind of compound colour-keeping liquid being dried for Arillus Longan and dry Drying method, the browning reaction during effectively suppressing Arillus Longan drying, reduce Arillus Longan loss of nutrient substance during drying, Effect of color protection is good, nonhazardous, safety operation high, convenient.
In order to solve above-mentioned technical problem, the invention discloses a kind of compound colour-keeping liquid being dried for Arillus Longan, by quality Percentage ratio is made up of following component: ascorbic acid 0.05%～0.15%, malic acid 0.06%～0.10%, calcium chloride 0.10% ～0.30%, sodium bicarbonate 0.10%～0.30%, surplus is water.
Preferably, it is made up of following component by mass percentage: ascorbic acid 0.1%, malic acid 0.08%, calcium chloride 0.3%, sodium bicarbonate 0.1%, surplus is water.
The invention also discloses a kind of dried longan drying method, comprise the following steps:
Fresh Arillus Longan carried out beta pruning and selects classification, to the fresh blunt enzyme of Arillus Longan blanching after classification, putting into through the Arillus Longan of blanching Color retention in colour-keeping liquid, carries out hot air drying to the Arillus Longan after color retention；Described colour-keeping liquid is by mass percentage by following Component forms: ascorbic acid 0.05%～0.15%, malic acid 0.06%～0.10%, calcium chloride 0.10%～0.30%, carbon Acid hydrogen sodium 0.10%～0.30%, surplus is water.
Further, described colour-keeping liquid is made up of following component by mass percentage: ascorbic acid 0.1%, malic acid 0.08%, calcium chloride 0.3%, sodium bicarbonate 0.1%, surplus is water.
Further, described beta pruning and select classification particularly as follows: select fruit maturity close, the healthy fresh dragon without insect pest Eye, selects without outside mechanical damage person, and beta pruning is stayed after obstructing about 0.5cm and carried out classification, chooses the homogeneous fresh Arillus Longan that is of moderate size and treats With.
Further, the blunt enzyme of described blanching is particularly as follows: immerse blanching 3min in 100 DEG C of hot water, room by fresh Arillus Longan after classification Temperature cooling.
Further, the time of described color retention is 30min, and solid-liquid ratio is 1:1.5.
Further, described hot air drying uses stage drying mode: first stage baking temperature is 65 DEG C, drying time 6h, hot blast speed 1.5m/s, second stage baking temperature is 75 DEG C, 12h drying time, hot blast speed 1.5m/s, the phase III Baking temperature is 70 DEG C, 6h drying time, hot blast speed 1.5m/s.
Further, described hot air drying takes two-layer Arillus Longan to bake.
Compared with prior art, the present invention can obtain and include techniques below effect:
(1) in each component of the present invention, ascorbic acid can be combined with newborn quinones substance, can auxiliary with complexation polyphenol oxidase Base, directly acts on enzyme, stops the generation of enzymatic browning, and ascorbic acid has reproducibility simultaneously, is possible to prevent colour generation in sarcocarp Material is oxidized；Calcium chloride can keep the fragility of fruit and vegerable, prevents fruit and vegerable shrinkage deformation in the course of processing, can also make simultaneously For colour fixative, suppress fruit and vegerable brown stain；Malic acid and sodium bicarbonate and ascorbic acid and calcium chloride etc. with the use of, to browning inhibition There is a gain effect, thus the browning reaction during effectively suppression Arillus Longan is drying, reduce Arillus Longan nutrient substance during drying Loss, and then extend dry Arillus Longan storage life；
(2) use colour-keeping liquid of the present invention that Arillus Longan is carried out color retention, hence it is evident that to improve the color and luster of drying longan pulp, and And the browning degree of the drying Arillus Longan of effective reduction, decrease the loss of nutrient substance such as soluble protein and saccharide, to PPO simultaneously Passivation is had with POD；
(3) this colour-keeping liquid has that comprehensive effect of color protection is good, nonhazardous, safety is high, facilitate the features such as operation.
Certainly, the arbitrary product implementing the present invention it is not absolutely required to reach all the above technique effect simultaneously.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the present invention, this Bright schematic description and description is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is embodiment of the present invention longan pulp brown stain degree comparison diagram；
Fig. 2 is embodiment of the present invention longan pulp aberration comparison diagram；
Fig. 3 is soluble protein content comparison diagram in embodiment of the present invention longan pulp；
Fig. 4 is content of reducing sugar comparison diagram in embodiment of the present invention longan pulp；
Fig. 5 is PPO enzyme comparison diagram alive in embodiment of the present invention longan pulp；
Fig. 6 is POD enzyme comparison diagram alive in embodiment of the present invention longan pulp.
Detailed description of the invention
Embodiments of the present invention are described in detail, thereby to the present invention how application technology hands below in conjunction with embodiment Section solves technical problem and reaches the process that realizes of technology effect and can fully understand and implement according to this.
A kind of compound colour-keeping liquid being dried for Arillus Longan of the present invention, is made up of following component: Vitamin C by mass percentage Acid 0.05%～0.15%, malic acid 0.06%～0.10%, calcium chloride 0.10%～0.30%, sodium bicarbonate 0.10%～ 0.30%, surplus is water.
Preferably, it is made up of following component by mass percentage: ascorbic acid 0.1%, malic acid 0.08%, calcium chloride 0.3%, sodium bicarbonate 0.1%, surplus is water.
The peak of above-mentioned each component content, all in the range that GB 2760 is limited, meets additive and uses mark Accurate；Secondly by test, in the range of learning that above each component is taken, effect of color protection is dried for band shell Arillus Longan the most optimum；? After, it is considered to production cost, if the concentration of being further added by, it will increasing the usage amount of each component, i.e. cost would increase.So, comprehensive on Stating consideration, the content range of each component is above-mentioned each value scope.
This colour-keeping liquid carries out color fixative for the Arillus Longan before being dried, it is not necessary to Arillus Longan is carried out heat treatment, it is ensured that be dried consequence Real integrity.This colour-keeping liquid is by adding ascorbic acid, malic acid, calcium chloride, sodium bicarbonate etc. as color fixative component, wherein Ascorbic acid can directly act on enzyme with the prothetic group of complexation polyphenol oxidase, stops the generation of enzymatic browning, ascorbic acid simultaneously There is reproducibility, be possible to prevent present-color material in sarcocarp oxidized；Calcium chloride is a kind of conventional sclerosing agent, can keep fruit and vegerable Fragility, prevents fruit and vegerable shrinkage deformation in the course of processing, can also suppress fruit and vegerable brown stain as colour fixative simultaneously.Malic acid With sodium bicarbonate and ascorbic acid and calcium chloride etc. with the use of, browning inhibition is had gain effect.
A kind of dried longan drying method, comprises the following steps:
S01, beta pruning and select classification
Selection fruit maturity is close, the healthy fresh Arillus Longan without insect pest, selects without outside mechanical damage person, and beta pruning stays stalk about Carry out classification after 0.5cm, choose the homogeneous fresh Arillus Longan that is of moderate size stand-by；
S02, the blunt enzyme of blanching
Fresh Arillus Longan after classification is immersed blanching 3min in 100 DEG C of hot water, and room temperature cools down；
S03, color retention
Putting into color retention in colour-keeping liquid through the Arillus Longan of blanching, after process, room temperature drains；Described colour-keeping liquid presses percent mass Ratio is made up of following component: ascorbic acid 0.05%～0.15%, malic acid 0.06%～0.10%, calcium chloride 0.10%～ 0.30%, sodium bicarbonate 0.10%～0.30%, surplus is water.
Preferably, described colour-keeping liquid is made up of following component by mass percentage: ascorbic acid 0.1%, malic acid 0.08%, calcium chloride 0.3%, sodium bicarbonate 0.1%, surplus is water.
Further, the time of described color retention is 30min, and solid-liquid ratio is 1:1.5.
Color fixative selection of time 30min, reason be the Arillus Longan of the method color fixative without heat treatment, soak time is too short, makes Colour-keeping liquid cannot go deep in fruit contaminating sarcocarp, and long soaking time then causes Arillus Longan shell the most weak, cracky.Solid-liquid ratio is low When 1:1.5, Arillus Longan cannot be totally submerged in colour-keeping liquid, affects effect of color protection；When solid-liquid ratio is higher than 1:1.5, easily causes and protect Color liquid too much causes waste, improves Financial cost, therefore selects solid-liquid ratio 1:1.5.
S04, hot air drying
Arillus Longan after color retention is carried out hot air drying.
Further, described hot air drying uses stage drying mode: first stage baking temperature is 65 DEG C, drying time 6h, hot blast speed 1.5m/s, second stage baking temperature is 75 DEG C, 12h drying time, hot blast speed 1.5m/s, the phase III Baking temperature is 70 DEG C, 6h drying time, hot blast speed 1.5m/s.
Dry run is broadly divided into three steps, and the first stage heats with lower temperature so that during Arillus Longan is dried, water The evaporation rate divided, less than the migration rate of internal moisture, to prevent owing to Arillus Longan dry tack free is excessively strong, and makes Pericarpium Longan One layer of stiff film of upper formation causes major part residual moisture obstruct to cause outside wet speed soft, dry harder, internal in Pericarpium Longan Rate drastically descends degradation phenomenon；Second stage is dried with higher temperature, improves drying efficiency；The heating of phase III is intended to fruit Greatly, meat is thick or because air humidity is big, the system that do not reaches does the Arillus Longan supplementary heating of standard.
Further, described hot air drying takes two-layer Arillus Longan to bake, this mode during drying without stirring.
S05, cooling
Preserve after dried Arillus Longan is cooled down.
Use colour-keeping liquid of the present invention that Arillus Longan is processed, the browning reaction during effectively suppressing Arillus Longan drying, subtract Few Arillus Longan loss of nutrient substance during drying, reduces polyphenol oxidase and peroxidase activity, thus is conducive to prolonging Long dried longan storage life.
Embodiment
Selection fruit maturity is close, the healthy fresh Arillus Longan without insect pest, selects without outside mechanical damage person, and beta pruning stays stalk about Carry out classification after 0.5cm, choose the homogeneous fresh Arillus Longan that is of moderate size stand-by；To the fresh blunt enzyme of Arillus Longan blanching after classification, immerse 100 Blanching 3min in DEG C hot water, room temperature cools down；Putting into color retention 30min in colour-keeping liquid through the Arillus Longan of blanching, solid-liquid ratio is 1: 1.5, the proportioning of described colour-keeping liquid sees table 1, and the colour-keeping liquid of the colour-keeping liquid and comparative example that list different ratio in table 1 is joined Ratio, surplus is water；Arillus Longan after color retention is carried out hot air drying, described hot air drying employing stage drying mode: first Stage baking temperature is 65 DEG C, 6h drying time, hot blast speed 1.5m/s, and second stage baking temperature is 75 DEG C, drying time 12h, hot blast speed 1.5m/s, phase III baking temperature is 70 DEG C, 6h drying time, hot blast speed 1.5m/s.
Table 1 colour-keeping liquid proportioning
To not carrying out the comparative example of color retention and according to the dried Arillus Longan of colour-keeping liquid proportioning color retention in table 1 and enter Row test:
One, evaluation index and assay method:
(1) mensuration of brown stain degree
Weigh the Meat Sample after 2g enucleation respectively, add the acetum of 20mL 2% (v/v) after being fully ground, fully Mixing, at 8000r min-1Under be centrifuged 10min, Aspirate supernatant.20mL acetone is added in supernatant, after mix homogeneously 8000r·min-1Under be centrifuged 10min, Aspirate supernatant.Its optical density, result D is measured under 420nm wavelength420nmRepresent.
(2) mensuration of aberration
Color difference meter measures the aberration of dried longan pulp, each sample determination 5 times, takes 3 different angles every time.
(3) content of reducing sugar measures
Content of reducing sugar mensuration employing 3,5-dinitrosalicylic Acid Colorimetry mensuration (Wang Xuekui. plant physiology and biochemistry is tested Principle and technology [M]. Beijing: Higher Education Publishing House, 2006:202-205.).
(4) soluble protein content measures
Soluble protein content measures and uses Bradford method (Bradford MM.A rapid and sensitive method for the quantification of microgram qualities of proteins utilizing the principle of protein-dye binding[J].Analytical Biochemistry,1976,72:248- 254.)。
(5) mensuration of POD and PPO activity
Take about 2g dried longan sarcocarp, chopping, put in mortar, add appropriate phosphate buffer (pH=6.8) at ice bath ring Border grinds to form homogenate, adds altogether 6mL buffer and all proceeds to centrifuge tube, with the rotating speed frozen centrifugation 20min of 9000r/min, Save backup under low temperature.
The reaction system measuring POD enzymatic activity includes 1.8mL 0.05mol.L-1Phosphate buffer (pH=6.8), 1.0mL 2%H2O2Solution, 1.0mL 0.05mol.L-1Guaiacol solution and 0.2mL enzyme liquid.To heat the enzyme liquid of 5min in boiling water For comparison, do three groups of repetitions.Reaction system adds timing after enzyme liquid, and is immediately placed in ultraviolet spectrophotometer sample room, every 0.5min carries out absorbance measurement, and wavelength is 470nm.Increasing by 1 with every gram of sample absorbance per minute changing value is a peroxide Compound unit of enzyme activity, Δ OD470/min.g.Calculate with reference to formula 1.
U = ΔOD 470 × V V s × m - - - ( 1 )
Δ OD in formula: sample is light absorption value variation per minute at 470nm；V: sample extracting solution cumulative volume, mL；Vs: survey The taken sample extracting liquid volume of timing, mL；M: sample quality g.
The processing method that during PPO determination of activity, the preparation of enzyme liquid measures with POD, buffer is changed to the phosphoric acid of pH=5.8 and delays Rush salt.The reaction system measuring enzymatic activity includes 1.5mL 0.05mol.L-1Phosphate buffer (pH=7), 1.0mL0.05mol.L-1Catechol solution and 0.5mL enzyme liquid.It is used in boiling water and heats the enzyme liquid of 5min for comparison, do three groups Repeat.Reaction system adds timing after enzyme liquid, and is immediately placed in ultraviolet spectrophotometer sample room, carries out extinction every 0.5min Degree measures, and wavelength is 470nm.The Rate activity of dried longan sarcocarp PPO is calculated by formula 1.
Two, test result:
(1) g degree and the change of aberration
The Arillus Longan that different composite colour-keeping liquid processes carries out (the different small letters in figure as shown in Figure 1 of the brown stain degree after hot air drying There is significant difference between letter representation different disposal, p < 0.05, lower with), it can be seen that Arillus Longan is carried out at color fixative before drying Reason can reduce drying during browning reaction, the brown stain degree of embodiment 5 is 0.046D420nm, far below other embodiments.Newly Multipole difference statistical analysis shows: embodiment 5 and embodiment 1,2,3 exist significant difference (P ＜ 0.05), embodiment 1,2,3,7 (P ＞ 0.05) is there was no significant difference between group.
For Arillus Longan after drying, aberration the least then explanation dried longan flesh color is closer to fresh Arillus Longan.Different multiple Close colour-keeping liquid on the drying flesh color impact of Arillus Longan as in figure 2 it is shown, between each component numerical value difference little, new multipole difference is added up Analysis shows: there was no significant difference (P ＞ 0.05) between comparative example and embodiment 8.
(2) soluble protein and the change of content of reducing sugar
Different colour-keeping liquid process the impact of rear soluble protein contents drying on Arillus Longan and see Fig. 3, as shown in Figure 3, drying after Arillus Longan soluble protein content embodiment 6 the highest.New multipole difference statistical analysis shows: embodiment 6 and embodiment 3,4,5,7,9 There was no significant difference between group (P ＞ 0.05), between embodiment 6 and comparative example, embodiment 1,2,8 groups, there is significant difference (P ＜ 0.05), there is also significant difference (P ＜ 0.05) between embodiment 5 and comparative example, embodiment 2.
Fig. 4 is shown in the impact that different colour-keeping liquid process rear content of reducing sugar drying on Arillus Longan, as shown in Figure 4, and drying rear Arillus Longan Content of reducing sugar embodiment 5 is the highest.New multipole difference statistical analysis shows: embodiment 5 and comparative example, embodiment 4 exist significance Difference (P ＜ 0.05), there is also significant difference (P ＜ 0.05) between comparative example and embodiment 3,9.
(3) PPO and POD activity change
In general, peroxidase and polyphenol oxidase are the crucial enzymes causing fruit and vegerable brown stain, PPO Yu POD enzyme is lived The highest, then Arillus Longan brown stain speed in dry run is the fastest.
Fig. 5 is PPO enzyme activity determination result, and its new multipole difference statistic analysis result is as follows: embodiment 5 and comparative example, enforcement There is significant difference (P ＜ 0.05) in example 7,9, there was no significant difference (P ＞ 0.05) between embodiment 9 and 7.Fig. 6 is that POD enzyme is lived Measurement result, its new multipole difference statistic analysis result is as follows: there was no significant difference (P ＞ 0.05) between embodiment 5 and 3, implements The POD enzyme of example 5 and 3 is lived significantly lower than other several groups.By Fig. 5 and Fig. 6 it can be seen that PPO with POD of embodiment 5 is minimum, this Dried longan PPO enzyme 0.088 Δ OD alive after colour-keeping liquid process470The work of/(min g), POD enzyme is 3.181 Δ OD470/(min· G), hence it is evident that less than other embodiments.
Use colour-keeping liquid of the present invention that Arillus Longan is carried out color retention, hence it is evident that to improve the color and luster of drying longan pulp, and Effectively reduce the browning degree of drying Arillus Longan, decrease the loss of nutrient substance such as soluble protein and saccharide simultaneously, to PPO and POD has passivation.When compound colour-keeping liquid contains 0.10% ascorbic acid, 0.08% malic acid, 0.30% calcium chloride, During 0.10% sodium bicarbonate, drying Arillus Longan quality is more excellent, and the Arillus Longan brown stain degree after this colour-keeping liquid processes is 0.046D420nm, PPO enzyme Live 0.088 Δ OD470The work of/(min g), POD enzyme is 3.181 Δ OD470/(min·g)。
As employed some vocabulary in the middle of description and claim to censure special component or method.Art technology Personnel are it is to be appreciated that same composition may be called with different nouns in different regions.This specification and claims are not In the way of the difference of title is used as distinguishing composition." comprising " as mentioned by the middle of description and claim in the whole text is One open language, therefore " comprise but be not limited to " should be construed to." substantially " refer in receivable range of error, this area Technical staff can solve described technical problem in the range of certain error, basically reaches described technique effect.Description is follow-up It is described as implementing the better embodiment of the present invention, for the purpose of right described description is the rule so that the present invention to be described, not In order to limit the scope of the present invention.Protection scope of the present invention is when being as the criterion depending on the defined person of claims.
Also, it should be noted term " includes ", " comprising " or its any other variant are intended to nonexcludability Comprise, so that include that the commodity of a series of key element or system not only include those key elements, but also include the most clearly Other key elements listed, or also include the key element intrinsic for this commodity or system.In the feelings not having more restriction Under condition, statement " including ... " key element limited, it is not excluded that in the commodity including described key element or system also There is other identical element.
Described above illustrate and describes some preferred embodiments of invention, but as previously mentioned, it should be understood that invention is not It is confined to form disclosed herein, is not to be taken as the eliminating to other embodiments, and can be used for other combinations various, amendment And environment, and can be carried out by above-mentioned teaching or the technology of association area or knowledge in invention contemplated scope described herein Change.And the change that those skilled in the art are carried out and change are without departing from the spirit and scope of invention, the most all should weigh appended by invention In the protection domain that profit requires.

Claims (9)

1. the compound colour-keeping liquid being dried for Arillus Longan, it is characterised in that be made up of following component by mass percentage: anti-bad Hematic acid 0.05%～0.15%, malic acid 0.06%～0.10%, calcium chloride 0.10%～0.30%, sodium bicarbonate 0.10%～ 0.30%, surplus is water.
2. the compound colour-keeping liquid being dried for Arillus Longan as claimed in claim 1, it is characterised in that by mass percentage by following Component forms: ascorbic acid 0.1%, malic acid 0.08%, calcium chloride 0.3%, sodium bicarbonate 0.1%, surplus is water.
3. a dried longan drying method, it is characterised in that comprise the following steps:
Fresh Arillus Longan carried out beta pruning and selects classification, to the fresh blunt enzyme of Arillus Longan blanching after classification, putting into color fixative through the Arillus Longan of blanching Color retention in liquid, carries out hot air drying to the Arillus Longan after color retention；Described colour-keeping liquid is by mass percentage by following component Composition: ascorbic acid 0.05%～0.15%, malic acid 0.06%～0.10%, calcium chloride 0.10%～0.30%, bicarbonate Sodium 0.10%～0.30%, surplus is water.
4. dried longan drying method as claimed in claim 3, it is characterised in that described colour-keeping liquid is by mass percentage by following group Part composition: ascorbic acid 0.1%, malic acid 0.08%, calcium chloride 0.3%, sodium bicarbonate 0.1%, surplus is water.
5. dried longan drying method as claimed in claim 3, it is characterised in that described beta pruning and select classification particularly as follows: select Fruit maturity is close, the healthy fresh Arillus Longan without insect pest, selects without outside mechanical damage person, and beta pruning is stayed after obstructing about 0.5cm and carried out Classification, chooses the homogeneous fresh Arillus Longan that is of moderate size stand-by.
6. dried longan drying method as claimed in claim 3, it is characterised in that the blunt enzyme of described blanching is particularly as follows: by fresh after classification Arillus Longan immerses blanching 3min in 100 DEG C of hot water, and room temperature cools down.
7. dried longan drying method as claimed in claim 3, it is characterised in that the time of described color retention is 30min, feed liquid Ratio is 1:1.5.
8. dried longan drying method as claimed in claim 3, it is characterised in that described hot air drying employing stage drying mode: First stage baking temperature is 65 DEG C, 6h drying time, hot blast speed 1.5m/s, and second stage baking temperature is 75 DEG C, is dried Time 12h, hot blast speed 1.5m/s, phase III baking temperature is 70 DEG C, 6h drying time, hot blast speed 1.5m/s.
9. dried longan drying method as claimed in claim 3, it is characterised in that described hot air drying takes two-layer Arillus Longan to dry System.
CN201610564696.XA 2016-07-18 2016-07-18 Composite color protection liquid for longan drying and drying method Active CN106070550B (en)

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CN112268412B (en) * 2020-10-26 2023-09-29 中国热带农业科学院农产品加工研究所 Longan pretreatment liquid and method for rapidly drying longan

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