CN1051438C

CN1051438C - Preserving agent for preventing Chinese chestnut from mildewing desiccating, browning and being moth-eaten at normal atmospheric temp.

Info

Publication number: CN1051438C
Application number: CN94107002A
Authority: CN
Inventors: 黄金雄; 姚荣桂; 秦子斌
Original assignee: Wuhan University WHU
Current assignee: Wuhan University WHU
Priority date: 1994-06-04
Filing date: 1994-06-04
Publication date: 2000-04-19
Anticipated expiration: 2014-06-04
Also published as: CN1114140A

Abstract

The present invention discloses a fresh keeping agent which has the function of preventing mildew, drying, brown change and insect damage at normal temperature. The present invention is basically a nontoxic compound and can effectively prevent Chinese chestnuts from becoming mouldy, becoming brown, losing water or being damaged by insects; Chinese chestnuts which use the fresh keeping agent have the characteristics that after being stored in 6 months, the good fruit rate is over 95%, the weight loss rate is about 12%, the color and the fragrance are normal, and the use is convenient; the Chinese chestnuts only need to be packed in sacks or plastic baskets to be soaked for several minutes. The present invention is a fresh keeping agent for storing Chinese chestnuts at normal temperature.

Description

The anti-anti-Chinese chestnut antistaling agent of damaging by worms of anti-brown stain of doing of mildew-resistant under the normal temperature

The invention discloses the anti-anti-Chinese chestnut antistaling agent of damaging by worms of anti-brown stain of doing of a kind of mildew-resistant, claim WDA template chestnut antistaling agent again, it belongs to technical field of inorganic, also belongs to the agriculture chemistry technical field.

At present, the storage of Chinese chestnut generally adopts cryogenic freezing both at home and abroad, cryopreservation behind the co-60 radiation (Yang.Ho Sook.et.Hanguk Sikpum Kwahakhoechi 1983.15 (3) 238-244.), and sealing atmosphere storage and antistaling agent soak the back storage.Though preceding two kinds of method effects are better, need the high equipment of valency, though sealing atmosphere method storage has certain effect, because Chinese chestnut is a live body, easily the generation anaerobic respiration causes producing peculiar smell and is restricted under sealed environment.Hermetically storing method and antistaling agent storage method have following report:

1. Chinese chestnut is packed in the Polythene Bag, fill CO ₂Back sealing cryopreservation (" day disclosure special permission " 91,262,440);

2. Chinese chestnut is immersed in the cold water (1～5 ℃) and fills CO ₂Storage.(" Japan's special permission communique " 8609012);

3. Chinese chestnut is heated to 50～60 ℃, after the cooling, fills CO ₂Hermetically storing.(" day disclosure special permission " 8139743);

4. after Chinese chestnut being soaked with thiophanate methyl, be sealed in the silicone rubber membrane, and add oxygen absorbent and drier storage, can store rotting rate 4.67% 4 months.(Liu Xuebin etc., " fruit tree science " 10 (1) .42～44,1993);

5. with behind the aluminum phosphide fumigation desinsection, use K ₂MnO ₄+ NaCl washes fruit, adds again to lay particular stress on sodium pyrosulfite and maybe must restrain the azoles bactericide and in polybag, seal, and after 5 months, good fruit rate 92%, weight-loss ratio 10.7%.(Yao Ziming etc., " Anhui agricultural sciences " 1989, (4) 78～85);

6. use CS ₂Behind 24 hours desinsections of fumigation, in the Polythene Bag of packing into, regularly be blown into gases such as ozone or anion with the air discharge fresh machine, seal, 60 days storage phases, good fruit rate 80%, weight-loss ratio 5%.(Zheng Guoshe etc., " Anhui Agriculture College's journal " 1990, (1) 32～36);

7. use the Rogor desinsection, soak fruit with thiophanate methyl again, adopt conversion packaging bag storage method, can store 3 months, good fruit rate 93.38%, weight-loss ratio 19%.(Zheng Guoshe etc., " Anhui Agriculture College's journal " 1985, (2) 65～71);

8. with lime water logging diel, store after 24 days, rotting rate is 4%.(tension force field etc., " hubei agricultural science " 1991, (3) 30～31);

9. with 2,4-D solution soaked after 24 hours, at room temperature stored 150 days, and the decayed fruit rate is 13%.(Yang Qiguang etc., " Plant Physiology Communications " 1992,28 (5), 334～336);

In sum, various antistaling agents in the past store or toxicity is bigger, or effect is relatively poor, can not fundamentally solve mildew and rot that Chinese chestnut occurs in storage, weightlessness, problems such as insect pest and color, smell and taste.

The objective of the invention is: for reduce Chinese chestnut because of easily go rotten, brown stain, shrivelled, the economic loss (2～30,000 tons of the annual losses in the whole nation) of damaging by worms and bringing.Intend to seek that a kind of raw material is easy to get, inexpensive, easily synthetic, easy to use, long fresh-keeping period, good refreshing effect, antistaling agent that toxicity is little.

Be the technical measures that realize that the object of the invention is taked:

1. synthetic WDA type antistaling agent: at 1Kg CaCO ₃In, add the dense HCl of 2Kg, filter, add alkali and remove heavy metal, if CaCO ₃For high-purity does not contain heavy metal or contains trace heavy metal, then can not add alkali and need not remove heavy metal, add 0.1～0.8%Ca (acac) again with respect to water ₂(calcium acetylacetonate).

2. fresh-keeping: through exploratory development repeatedly, find that at first antistaling agent of the present invention has the effect of fresh-keeping Chinese chestnut, press the 1Kg antistaling agent and preserve the 33Kg Chinese chestnut, Chinese chestnut is immersed in the WDA type antistaling agent solution 5～10 minutes, take out, with plastic foil sealing 4 hours, utilize the oxygen uptake effect of this antistaling agent, deinsectization, then, open wide, in the room that ventilates, preserve.

Compared with the prior art the technique effect that has reached more:

1. detect: this antistaling agent is checked through Hubei Prov. Health ﹠ Epidemic Prevention Station, with rat oral test, LD ₅₀Be the 5010mg/kg rat, the lethal dose that is equivalent to the people is 34.4～73 gram/people.Belong to low toxicity one actual nontoxic scope.

2. result of use:

A., the coverboard chestnut is arranged, preserve after 6 months, the rate of going rotten is less than 5%, and weightless dose rate is preserved between 2～May about 12%, tastes through teachers and students, and color is normal, other method that is better than using always.About the comparison of the present invention and prior art, list in the table 1.

B. the Chinese chestnut of peeling off: in three months, brown stain does not take place.And with EDTA-2Na immersion person (" food additives ", Tianjin Light Industry College food industry teaching research chamber are compiled, 1985, P76), mould entirely after the week.

3. use: the present invention can use in rural area and commercial department, can reduce the loss of Chinese chestnut greatly, also can increase foreign exchange earnings from exports.

Embodiment:

The high-purity CaCO of 1Kg ₃With the dense HCl reaction of 2Kg, after the filtration, add 0.5%Ca (acac) in the filtrate ₂, the WDA type antistaling agent that synthesizes is pressed the 1Kg antistaling agent and is preserved 33Kg Chinese chestnut, 66 jin of Luotian, fresh-keeping Hubei Chinese chestnuts, Chinese chestnut is immersed in the WDA type antistaling agent solution 5～10 minutes, takes out, with plastic foil sealing 4 hours, deinsectization, then, open wide, in the room that ventilates, preserve.After 6 months, rate＜5% that goes rotten, weight-loss ratio＜12% has reached long-term mildew-resistant, insect protected, the anti-purpose of doing, preventing brown stain.

Claims

1. the anti-anti-Chinese chestnut antistaling agent of damaging by worms of anti-brown stain of doing of mildew-resistant under the normal temperature is characterized in that: at 1KgCaCo ₃In add the 2Kg concentrated hydrochloric acid, after the filtration, add alkali and remove heavy metal or do not add alkali and do not remove trace heavy metal, add again greater than 0.1～0.8% the calcium acetylacetonate that equals with respect to water and make antistaling agent.