CN102308874B - Active oxygen scavenger based method for controlling browning of plucked longan fruit and pericarp - Google Patents
Active oxygen scavenger based method for controlling browning of plucked longan fruit and pericarp Download PDFInfo
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- CN102308874B CN102308874B CN 201110314070 CN201110314070A CN102308874B CN 102308874 B CN102308874 B CN 102308874B CN 201110314070 CN201110314070 CN 201110314070 CN 201110314070 A CN201110314070 A CN 201110314070A CN 102308874 B CN102308874 B CN 102308874B
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- active oxygen
- oxygen scavenger
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Abstract
The invention provides an active oxygen scavenger based method for controlling browning of plucked longan fruit and pericarp, and determines an active oxygen scavenger for effectively controlling browning of longan fruit and pericarp and an optimum concentration of the active oxygen scavenger in application. A preservative treatment, an active oxygen scavenger treatment and a modified atmosphere packaging are combined to carry out a fresh-keeping treatment on the longan fruits, so as to effectively control browning of plucked longan fruit and pericarp, preserve good appearance quality and mouthfeel, prolong shelf life and enhance economic benefits of longan. In addition, equipment is not highly required, easily operated, at low costs and easily to be popularized and applied to fruit growers and fruit wholesalers in producing areas, and fruit dealers during transportation.
Description
Technical field
The invention belongs to the fruits and vegetable stock and preserving freshness field, be specifically related to the method that rear longan fruit pericarp browning is adopted in active oxygen scavenger control.
Background technology
Longan (
Dimocarpus longanLour.) be a kind of Tropical fruits of south China, have higher medical value and nutritive value.The area of Fujian Province's cultivation is maximum, and total output accounts for the over half of national Longan Output, is that maximum in the world longan is concentrated the place of production.But the longan fruit maturation is in eight Septembers, and temperature is high, and rainwater is many, add that its morphosis is special, the post-harvest physiology metabolism is vigorous, fast, the easily brown stain and rotten of dehydration, greatly affect exterior quality and the commodity value of fruit, limited its Long-term Storage and remote the sale.Wherein pericarp browning is that longan fruit is adopted the most one of distinct issues of rear quality deterioration.Control longan fruit pericarp browning, prolongation longan fruit aging method mainly contain refrigeration, controlled atmosphere, sulphuring, irradiation etc. at present.Refrigeration and controlled atmosphere equipment investment are large, and operating cost is high, and longan fruit forwards the normal temperature shelf to after the refrigeration, easily brown stain stream juice; There are the residual and pulp of the sulphur problems such as peculiar smell that redden in sulphuring; But irradiation technique significant prolongation longan fruit shelf life, but be at present the laboratory research stage, also be not applied to produce.
When plant is subjected to environment stress, active oxygen accumulates in vivo, and the unrighted acid in the film fat is subject to the attack generation peroxidation of free radical, membrane fluidity descends, cause the compartmentation function of aldehydes matter in the vacuole and phenolase to destroy aldehydes matter oxidation polymerization, fruit tissue brown stain.The Exogenous Active Oxygen Species scavenger mainly contains ascorbic acid, glutathione, propyl gallate, citric acid etc., they can make fruits and vegetables keep the greater activity oxygen scavenging capacity, and significantly reduce active oxygen and produce speed and film lipid peroxidation degree, in the integrality of keeping membrane structure and keep enzyme and browning substrates plays key effect in the compartmentation function in cell, thereby can effectively control the fruits and vegetables browning.Wherein, ascorbic acid and aldehydes matter competitive reaction substrate O
2, quinone and the derivative thereof that the aldehydes matter oxidation forms can be reduced to aldehydes matter simultaneously, also can reduce the pH value in addition, the control phenolase activity, thus suppress enzymatic reaction.Reduced glutathione is a kind of r-glutamyl and sulfydryl (biologically active tripeptide compound SH) of containing simultaneously.As antioxidant, it can directly eliminate H
2O
2And indirectly reduce O
2 -.And OH, it contains-Cu of SH in can the chelating polyphenol oxidase
2+Thereby, suppress phenolase activity.Propyl gallate is the aldehydes matter that contains three-OH, with the active end of browning substrates competition PPO position, occurs thereby alleviate brown stain.Citric acid makes POD and LOX shortage coenzyme and reduces activity mainly as the chelating agent of metal ion, makes simultaneously enzyme depart from optimum pH.
Summary of the invention
The method that the object of the present invention is to provide active oxygen scavenger control to adopt rear longan fruit pericarp browning, the application of active oxygen scavenger carries out Preservation Treatment to fresh longan fruit, the easy browning of rear longan fruit pericarp is adopted in solution, keep simultaneously longan fruit preferably exterior quality and mouthfeel, Shelf-life; And easy and simple to handle, cost is low, and the fruit dealer is easy to apply in the orchard worker in the place of production, fruit whole seller and the transportation, and the control of adopting rear quality deterioration for other subtropical fruit such as litchi fruits simultaneously provides reference.
For achieving the above object, the present invention adopts following technical scheme:
The concrete steps that active oxygen scavenger is controlled the method for adopting rear longan fruit pericarp browning are as follows:
(1) longan fruit is after the precooling of gathering, select size evenly, maturity is consistent, without disease and pest, the fresh fruit that has no mechanical damage;
(2) longan fruit with step (1) carries out sterilization processing with antisepsis antistaling agent;
(3) longan fruit of step (2) is processed with active oxygen scavenger;
(4) longan fruit with step (3) dries, adopts modified-atmosphere package;
(5) longan fruit with step (4) places insulating box storage or circulation sale.
The maturity of the described longan fresh fruit of step (1) is eighty per cant to ninety percent.
The described sterilization processing of step (2) is to be that wearing of 0.05%-0.1% frustrated and soaked fruit 3 ~ 5 min in mould in volume fraction.
The described active oxygen scavenger ascorbic acid concentrations of step (3) is 0.1% ~ 0.5%, and reduced glutathione concentration is 0.1% ~ 1%, and citric acid concentration is 0.5% ~ 1%, and propyl gallate concentration is 0.1% ~ 1%.
The time that the described active oxygen scavenger of step (3) is processed longan fruit is 10 ~ 30min.
The described modified-atmosphere package of step (4) is to use Packing treatment, and bag film thickness is 0.015 ~ 0.030 mm.
The described reserve temperature of step (5) is 8 ~ 25 ℃, and relative humidity is 80-95 %.
All the other each operation, comprise gather, precooling, clean, dry, check, transportation, circulation sale are storage fruit and vegetable generally adopts post-processing approach.
Making longan fruit still have no the longan fruit pericarp behind 8 ~ 25 ℃ of lower storage 10 d according to described technology serious brown stain symptom occurs, better keep exterior quality and the mouthfeel of fruit, thereby rear longan fruit pericarp browning is adopted in control.
Remarkable advantage of the present invention is:
(1) the present invention adopts active oxygen scavenger that longan fruit is processed, by to the oxygen scavenging activity agent concentration, processing time and reserve temperature screen, determine the optium concentration of several active oxygen scavenger control longan fruit pericarp brownings, time and reserve temperature, effectively reduce and adopt rear longan fruit pericarp active oxygen generation speed, keep higher oxygen scavenging activity ability, alleviate film lipid peroxidation degree, in the integrality of keeping membrane structure and keep enzyme and browning substrates plays a role in the compartmentation function in cell, thereby effectively delay longan fruit pericarp browning symptom, keep longan fruit preferably exterior quality and mouthfeel, Shelf-life, the economic benefit of lifting fresh fruit.
(2) the used antisepsis antistaling agent of the present invention belongs to international, uses safe bactericide; The present invention selects suitable active oxygen scavenger according to the characteristics of longan fruit, and it is remarkable to suppress the longan peel brown stain.Selected active oxygen scavenger and modified-atmosphere package all belong to nontoxic, safe food additives; Longan of the present invention is processed in conjunction with modified atmosphere storage through active oxygen scavenger, and all not high to equipment requirement, workable, cost is low, and good refreshing effect is easy in orchard worker, fruit whole seller and the transportation at source fruit dealer etc. and applies.
Description of drawings
Fig. 1 is that AsA processes adopting the impact of rear longan peel browning index.
Fig. 2 is that AsA processes adopting the well impact of fruit rate of rear longan fruit.
Fig. 3 is that AsA processes adopting rear longan peel superoxide anion (O
2 -.) impact that produces speed.
Fig. 4 is the situation of the 12nd day pericarp browning after longan fruit is adopted: (1) GSH(glutathione) process; (2) undressed.
The specific embodiment
In order fully to disclose the method that rear longan fruit pericarp browning is adopted in control of the present invention, below the present invention is described further as example take ' good fortune eye ' longan fruit, but the invention is not restricted to this.
Embodiment 1:
Operating process is according to following steps:
Gather → precooling → choosing fruit, classification → cleaning → anti-corrosive fresh-keeping processes → dries → chemicals treatment → modified-atmosphere package → refrigeration → check → transportation → circulation sale
(1) selected, classification: select size evenly, maturity is consistent, without disease and pest, fresh ' good fortune eye ' fruit of having no mechanical damage, and fruit about ninety percent is ripe;
(2) clean: the circulating water flushing;
(3) antisepsis antistaling agent is processed: be 0.05% wear and frustrate mould bactericide and soak really 5 min with volume fraction;
(4) active oxygen scavenger is processed: the immersion of 0.2% ascorbic acid, processing time are 20 min;
(5) modified-atmosphere package: pack with polythene film bag (being the PE bag), bag film thickness is 0.015 mm, and 40 of every packed fruits;
(6) storage: reserve temperature is 15 ℃;
(7) after storage a period of time, ' good fortune eye ' longan fruit of warehouse-in is tested, guarantee fruit quality; Improve again the economic worth of longan fruit through transportation, circulation sale.
Can make ' good fortune eye ' longan fruit still have no pericarp at 15 ℃ of lower storage 10d according to described technology serious brown stain symptom occurs, better keeps exterior quality and the mouthfeel of fruit, thereby improve the economic benefit of longan fruit.
Embodiment 2:
During operation, with ninety percent ripe ' good fortune eye ' longan fruit real be 0.1% wear and frustrate mould bactericide and soak fruit 3min with volume fraction first, be 30 min with the immersion of 0.1% glutathione, processing time then; Again it is used Packing treatment, bag film thickness is 0.015 mm, and 50 of every packed fruits preserve under 15 ℃.Additive method before and after processing is with embodiment 1.
Can make ' good fortune eye ' longan fruit still have no fruit at 15 ℃ of lower storage 12 d according to described technology serious brown stain symptom occurs, better keeps exterior quality and the mouthfeel of fruit, thereby improve the economic benefit of longan fruit.
Embodiment 3:
During operation, be 0.1% wear and frustrate mould bactericide and soak fruit 3min with volume fraction first with ninety percent ripe ' good fortune eye ' longan fruit, then use 1% citric acid, 0.4% ascorbic acid and 0. 25% gallic acid mixed liquid dipping, process 15 min, again it is used Packing treatment, bag film thickness is 0.015 mm, and 50 of every packed fruits preserve under 15 ℃.Additive method before and after processing is with embodiment 1.
Can make ' good fortune eye ' longan fruit still have no fruit at 15 ℃ of lower storage 10 d according to described technology serious brown stain symptom occurs, better keeps exterior quality and the mouthfeel of fruit, thereby improve the economic benefit of longan fruit.
Embodiment 4:
During operation, be 0.05% wear and frustrate mould bactericide and soak fruit 5min with volume fraction first with ninety percent ripe ' good fortune eye ' longan fruit, then soak with 0.5% citric acid, process 20min, again it is used Packing treatment, bag film thickness is 0.015 mm, and 50 of every packed fruits preserve under 20 ℃.Additive method before and after processing is with embodiment 1.
Can make ' good fortune eye ' longan fruit still have no fruit at 20 ℃ of lower storage 8 d according to described technology serious brown stain symptom occurs, better keeps exterior quality and the mouthfeel of fruit, thereby improve the economic benefit of longan fruit.
Embodiment 5:
During operation, be 0.05% wear and frustrate mould bactericide and soak fruit 5min with volume fraction first with ninety percent ripe ' good fortune eye ' longan fruit, then soak with 0. 1% gallic acid, process 20min, again it is used Packing treatment, bag film thickness is 0.015 mm, and 50 of every packed fruits preserve under 20 ℃.Additive method before and after processing is with embodiment 1.
Can make ' good fortune eye ' longan fruit still have no fruit at 20 ℃ of lower storage 8 d according to described technology serious brown stain symptom occurs, better keeps exterior quality and the mouthfeel of fruit, thereby improve the economic benefit of longan fruit.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (1)
1. active oxygen scavenger is controlled the method for adopting rear longan fruit pericarp browning, and it is characterized in that: the concrete steps of described method are as follows:
(1) longan fruit is after the precooling of gathering, select size evenly, maturity is consistent, without disease and pest, the fresh fruit that has no mechanical damage;
(2) longan fruit with step (1) carries out sterilization processing with antisepsis antistaling agent;
(3) longan fruit of step (2) is processed with active oxygen scavenger;
(4) longan fruit with step (3) dries, adopts modified-atmosphere package;
(5) longan fruit with step (4) places insulating box storage or circulation sale;
The maturity of the described longan fresh fruit of step (1) is eighty per cant to ninety percent;
The described sterilization processing of step (2) is to be that wearing of 0.05%-0.1% frustrated and soaked fruit 3 ~ 5 min in mould in volume fraction;
The described active oxygen scavenger of step (3) is that concentration is that 0.1% ~ 0.5% ascorbic acid, concentration are that 0.1% ~ 1% reduced glutathione, concentration are that 0.5% ~ 1% citric acid, concentration are one or more in 0.1% ~ 1% the propyl gallate;
The time that the described active oxygen scavenger of step (3) is processed longan fruit is 10 ~ 30min;
The described modified-atmosphere package of step (4) is to use Packing treatment, and bag film thickness is 0.015 ~ 0.030 mm;
The described reserve temperature of step (5) is 8 ~ 25 ℃, and relative humidity is 80-95 %.
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| CN102308874B true CN102308874B (en) | 2013-01-02 |
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Cited By (3)
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| CN106490535A (en) * | 2016-11-03 | 2017-03-15 | 恩施土家族苗族自治州农业科学院 | potato raw slurry and preparation method thereof |
| CN106490544A (en) * | 2016-11-03 | 2017-03-15 | 恩施土家族苗族自治州农业科学院 | A kind of potato pulp preparation method and potato pulp prepared therefrom |
| CN107409866A (en) * | 2017-08-07 | 2017-12-01 | 福建农林大学 | It is a kind of to suppress litchi fruits disease and the processing method of pericarp browning |
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| CN104686644A (en) * | 2013-12-04 | 2015-06-10 | 四川农业大学 | High-efficiency nontoxic litchi fresh-keeping agent |
| CN103931755A (en) * | 2014-04-15 | 2014-07-23 | 福建农林大学 | Preservation method for collected longan fruits |
| CN106359557A (en) * | 2016-11-18 | 2017-02-01 | 新疆农业科学院农产品贮藏加工研究所 | Hydrogen peroxide active oxygen fruit and vegetable preservative as well as preparation method and application thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106490535A (en) * | 2016-11-03 | 2017-03-15 | 恩施土家族苗族自治州农业科学院 | potato raw slurry and preparation method thereof |
| CN106490544A (en) * | 2016-11-03 | 2017-03-15 | 恩施土家族苗族自治州农业科学院 | A kind of potato pulp preparation method and potato pulp prepared therefrom |
| CN107409866A (en) * | 2017-08-07 | 2017-12-01 | 福建农林大学 | It is a kind of to suppress litchi fruits disease and the processing method of pericarp browning |
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