CN105918543A - Cold-water tea soaking inspection and assessment method - Google Patents

Abstract

The invention relates to a cold-water tea soaking inspection and assessment method, in particular to an exported gunpowder tea or mee tea inspection and assessment method. The method comprises the steps that reference samples of exported gunpowder tea and mee tea are made, then sensory evaluation and adulterated suspicious matter inspection are performed, and physicochemical item inspection, pesticide residue inspection, heavy metal inspection, microbiological inspection and other item inspection additionally required in the contract between a seller and a buyer or letter of credit are carried out after products are qualified. The method further standardizes the review process and a technology so as to improve the scientificity, effectiveness and pertinence of the inspection, constantly improves the quality safety of exported gunpowder tea and mee tea and promotes healthy development of China's tea export trade.

Description

A kind of Folium Camelliae sinensis cold water opens soup inspection reviewing method

Technical field

Method is evaluated in the inspection that the present invention relates to a kind of Folium Camelliae sinensis.

Background technology

Folium Camelliae sinensis is one of large food of China's main exit, the most also carries history and the culture of the Chinese nation, Folium Camelliae sinensis The sound development of the export trade is directly connected to domestic agriculture-countryside-farmer's expanding economy and international economy and trade, political stablizing, and also closes simultaneously The international fame of China.China's export Folium Camelliae sinensis 32.26 ten thousand tons in 2011, the amount of money 9.65 hundred million dollars, wherein Zhejiang bureau area under one's jurisdiction goes out 14.10 ten thousand tons of mouth, accounts for more than the 50% of whole nation export volume.

Green tea and mee tea are China's traditional characteristics exported products, and annual export volume accounts for more than the sixty percent of Folium Camelliae sinensis total export volume, main Wanting export place is the low developed areas such as Africa, the Central Asia.And Zhejiang is outlet pearl, the main exit area of mee tea and producing region, Zhejiang The cradle of Shaoxing green tea especially.At present, there are Zhejiang, Shanghai, Hunan etc. in the main exit ground of green tea, and its raw material is essentially from Zhejiang The ground such as river, Fujian, Jiangxi；Mee tea main exit ground have Zhejiang, Anhui, Jiangxi etc., its raw material essentially from Zhejiang, Anhui, Jiangxi, Henan, Hunan, Hubei etc., export pearl, the mee tea places of origin of raw materials gradually extends to interiorly, such as Sichuan, Guizhou, Yunnan at present In area, there is raw material sources region wide, the feature that export processing area is relatively concentrated.Pearl, mee tea export with a long history, in China Tea export trade has very important status.Meanwhile, outlet pearl, the balance of mee tea industry Tea Industry whole to China Development has great importance.But for various reasons, adulteration problem always along with outlet pearl, the development of mee tea, Remain incessant after repeated prohibition, beat without cease repeatly, become the biggest obstacle affecting this industry development.Once, outlet pearl, mee tea found interpolation carbon Black, ferrous sulfate etc. colour；Add the phenomenon of the weightening finishes such as Pulvis Talci, mineral powder, white sugar.At present, according to investigations, outlet pearl, mee tea It is two kinds of forms that adulteration mainly develops: one is to add " shaped tea "." shaped tea " is by tea powder, tea dust, tea ash and tea The leftover bits and pieces that after the extracted processing of leaf, remaining residue etc. are discarded during being originally Tea Processing, through bonding parch sizings such as rice pastes For green tea sample, how first system, refined link before raw material enters export enterprise are mixed in outlet tea by illegal trade company.Part " shaped tea " is difficult to bubble open through long-time brewed in hot water, and the safety of its binding agent there is also bigger hidden danger.Two is to add " to return Cage tea ".Tea grounds after mainly illegal manufacturer uses the enterprise such as tea beverage, Folium Camelliae sinensis extract to extract effective ingredient, again It is processed into the alloy of tea form.If tea grounds keeps Folium Camelliae sinensis form substantially, then former by drying the sifting tea being directly incorporated into low grade In material, through together just, refined after export；If the unqualified shape of tea grounds, then through shine dry-cure be fabricated to " shaped tea ", ibid spell into Normal tea middle outlet.

Owing to pearl, mee tea are China's characteristic exported product, only have state-owned a small amount of productions such as Vietnam at present and export, therefore international On this series products is not had detailed standard, its standard of evaluating of inspection is more lacked.And due to pearl, mee tea major consumers in Export markets, domestic substantially without selling, therefore, in only having country's proposed standard " green tea " (GB/T14456-2008), phase The setting of pass standard, and inapplicable outlet pearl, the routine check of mee tea and work of checking on, the science that inspection is judged, accurately Property exist bigger problem.For up-to-date tea judgement method standard aspect, GB " Folium Camelliae sinensis sensory review's method " (GB/T 23776-2009) for be also domestic Famous High-quality Tea be main, outlet pearl, mee tea quality, safety and adulteration aspect are not had Relate to.

Summary of the invention

In order to solve above-mentioned technical problem, it is an object of the invention to provide a kind of Folium Camelliae sinensis cold water and open soup inspection evaluation side Method, the method more effectively evaluates whether Folium Camelliae sinensis colours, adulterates and containing other defective Folium Camelliae sinensis.

In order to realize above-mentioned purpose, present invention employs following technical scheme:

A kind of Folium Camelliae sinensis cold water opens soup inspection reviewing method, it is characterised in that the method comprises the following steps:

1) weigh 10 g samples respectively and with reference to sample, room temperature, be placed in glass, inject cold water 200ml；

2) in cup infusion of tea to 2 minutes, 5 minutes, 8 minutes time, respectively with stirring rod the most each in glass Stir 20 times；

3) after infusion of tea in cup to 10 minute, the millet paste in glass and Folium Camelliae sinensis are all poured into be placed with filter screen evaluate bowl In, and Folium Camelliae sinensis in net is poured in white enamel dish to be checked；

4) after millet paste stands 2 minutes in bowl, pour in bare glass cup, first evaluate the depth of soup color, transparency and float, then Evaluate the precipitate in bowl；

5) add in white enamel tray at the bottom of appropriate cold water drift leaf, evaluate leaf background color pool and with or without other defective Folium Camelliae sinensis and miscellaneous Matter.

As preferably, the method is applied to export green tea or mee tea inspection is evaluated.

The present invention uses cold water soak, stirring to make the additive sticking to Folium Camelliae sinensis surface be suspended in water, with reference sample ratio To soup color, precipitate, more effectively evaluate whether Folium Camelliae sinensis colours, adulterates and containing other defective Folium Camelliae sinensis.It is applied to outlet Method standard is evaluated in pearl, mee tea inspection, and further specification evaluates flow process and technology, to improve science that inspection checks on, effectively Property and specific aim, improve constantly outlet pearl, the quality safety of mee tea, promote the sound development of China tea export trade.

Accompanying drawing explanation

Fig. 1 is that the present invention exports green tea, flow process is evaluated in mee tea inspection.

Fig. 2 is outlet green tea, mee tea reference sample fabrication processing.

Detailed description of the invention

Embodiment 1

1 scope

Invention provides for exporting green tea, mee tea checks the method evaluated.

The present invention is applicable to export green tea, the inspection of mee tea is evaluated.

2 normative references

The following files is requisite for the application of the present invention.Every reference document with bearing date, only version with bearing date Originally the present invention it is applicable to.Every reference document without bearing date, its latest edition (including all of amendment) is applicable to this Bright.

GB 2762 national food safety standard pollutants in food is limited the quantity

GB 2763 national food safety standard Pesticide MRL

GB 5749 drinking water sanitary standard

GB/T 14456.1 green tea part 1: basic demand

GB/T 14487 Folium Camelliae sinensis sensory review's term

SN/T 0917 imports and exports tea leaf quality sensory review's method

SN/T 3133 imports and exports Folium Camelliae sinensis inspection procedure

3 term and definitions

3.1 green tea gunpowder tea

With flat parch as raw material, through the refined graininess green tea processed；Because originating from ShaoXing,ZheJiang par town, therefore also known as flat Globule tea.

3.2 mee tea chunmee tea

With long parch as raw material, through the refined streak green tea processed；Gain the name such as eyebrow because its rope is very thin.

3.3 Folium Camelliae sinensis are with reference to sample reference sample of tea

Requirement according to all kinds of Folium Camelliae sinensis different brackets quality specifications, the Folium Camelliae sinensis of comparison when inspection is evaluated pre-established are in kind Sample.Folium Camelliae sinensis should have certain scope of application with reference to sample and use time restriction.

4 sampling

Perform by SN/T 3133 regulation.

5 evaluate room condition

Perform by SN/T 0917 regulation.

Personnel's primary condition and requirement are evaluated in 6 inspections

Perform by SN/T 0917 regulation.

7 inspections are evaluated

7.1 inspection approval flow

As it is shown in figure 1, first carry out sensory review and doping suspicious item inspection, qualified after implement again physical and chemical project inspection, pesticide residual Stay that inspection project requires otherwise by inspection, heavy metal inspection, Micro biological Tests and both parties' contract or letter of credit other Item-test.

7.2 outlet green teas, the manufacture method of mee tea reference sample

See embodiment 2.

7.3 profiles are evaluated

7.3.1 performing by SN/T 0917 regulation, color and luster control reference sample is evaluated.

7.3.2 foreign impurity matters test is performed by SN/T 3133 regulation.

7.4 endoplasm inspections are evaluated

7.4.1 boiling water Kai Tangfa

Perform by SN/T 0917 regulation.

7.4.2 cold water Kai Tangfa

See embodiment 3.

7.5 doping suspicious item inspections

See embodiment 4.

7.6 physical and chemical project detections

Perform by SN/T 3133 regulation.

7.7 Detecting Pesticide

Input state-owned Pesticide Residues in Tea standard, detect by importer's standard；Importer, without Pesticide Residues in Tea standard, presses The pesticide residues project of GB 2763 regulation detects.

7.8 heavy metal analysis

Input state-owned heavy-metal residual standard, detect by importer's standard；Importer, without Folium Camelliae sinensis heavy-metal residual standard, presses The project of GB 2762 regulation detects.

7.9 Micro biological Tests

Perform by SN/T 3133 regulation.

7.10 sundry item is checked

Inspection project is required otherwise by both parties' contract or letter of credit, tests by relevant requirement.

7.11 defective process

Perform by SN/T 3133 regulation.

Embodiment 2

Make the raw material with reference to sample directly to make of essence tea raw material, it is also possible to raw tea raw material makes, such as Fig. 2 after refined processing Shown in, technological process is as follows:

1) raw material: making the raw material with reference to sample directly can make of essence tea raw material, or makes after refined processing of raw tea raw material；

1.1 raw tea raw materials

1.1.1 according to the actual composition situation of each department raw material in outlet green tea, mee tea finished product, different sources is selected in proportion Representative raw tea raw material；

1.1.2 according to different sources spring tea, summer tea, the actual composition situation of autumn tea raw material, Various Seasonal is selected to have generation in proportion The raw tea raw material of table；

1.1.3 according to different sources, the actual composition situation of Various Seasonal raw material, high, medium and low difference is selected the most in proportion The representative raw tea raw material of class；

1.1.4 primary election ingredient requirement quality normal, without deterioration, non-impurity-doped makes vacation situation；

1.1.5 in raw material to be stored in the special warehouse meeting Folium Camelliae sinensis Storage Requirement, and mark is carried out；

1.2 essence tea raw materials

1.2.1 raw material sources different producing area to be selected, larger, representative refined enterprise；

1.2.2 raw materials quality grade carries out specific aim selection by reference sample grade to be made；

1.2.3 primary election ingredient requirement quality normal, without deterioration, non-impurity-doped makes vacation situation；

1.2.4 in raw material to be stored in the special warehouse meeting Folium Camelliae sinensis Storage Requirement, and mark is carried out；

2) material quality is evaluated

2.1 all raw materials must carry out unifying to evaluate, it is important that carry out cold water to open soup, rejecting quality is abnormal and has doping to make The raw material of false situation；

2.2 profile evaluating the necessary every a collection of raw material of itemized record and endoplasm qualitative characteristics, are beneficial to follow-up assorted；

3) raw material is assorted

When 3.1 raw tea raw materials are assorted, can carry out following two schemes as the case may be, one is same or like by raw material Grade carries out assorted；Another kind is to carry out assorted by the major grades of feeding after processing；

When 3.2 essence tea raw materials are assorted, then carry out the most assorted by same or like grade；

4) refined processing

4.1 are processed by existing production technology；

Skilled, the careful and responsible tea making work of 4.2 selection techniques operates, and carries out the operation record of each operation；

4.3 are individually processed, and must not process with other Folium Camelliae sinensis simultaneously, and process time to concentrate as far as possible；

After 4.4 refined processing in goods, semi-finished product mark to be carried out, and be stored in the special storehouse meeting Folium Camelliae sinensis Storage Requirement In storehouse；

5) finished product is assorted

5.1 finished products are assorted includes the most assorted and semi-finished product assorted of essence tea raw material, assorted before will the product of according to target reference sample The good assorted plan of matter level design；

5.2 assorted work are the most careful, carry out quality collocation and tune by progressively method close to object reference sample level of quality Whole, and carry out relative recording in time；

5.3 first assorted samples 200 grams time assorted, after sample meets the requirement of reference sample matter, then are spelled in the assorted ratio of sample Join 2000 grams of sample of expansion, the most effective to verify the assorted scheme of sample；As expanded the quality of sample not in full conformity with requiring, then need Adjust assorted scheme further, until meeting；

6) quality authorization

6.1 until all with reference to sample is assorted complete after, sample preparation unit organization relevant expert is to carrying out quality authorization with reference to sample；

6.2 expert groups are single with reference in addition to sample except authorizing one by one, also to authorize the reference sample whether grade of same each grade of teas Substantially, gradient reasonable, and also need to comment explain archaic or dialectal words in current language this set with reference to sample in reality performs the most feasible, if representative；

6.3 expert groups propose to adjust improvement idea to reference to sample, and scene is directly adjusted, until final authorization is qualified；

7) even heap

7.1 manual even heaps, with the even even heap of heap machine when quantity is big；

During 7.2 manual even heap, select to pad the Polypropylence Sheet of cleaning on the floor of cleaning, want the Folium Camelliae sinensis of even heap by one by all Fixed order is laid on Polypropylence Sheet, after all having spread, stirs according to certain rules, is fully mixed thoroughly by Folium Camelliae sinensis；

7.3 after mixing thoroughly, vertical multi-point sampling carries out sensory review, check the uniformity of even heap；If uniform not, the most also need to continue Continuous stirring；

During 7.4 stirring, action must be soft, prevents unqualified；

After 7.5 fully mix thoroughly, quantitatively load in moisture-proof container；

Must ensure that even heap machine and vessel cleaning are dried before 7.6 operations；

8) segmentation

Folium Camelliae sinensis after even heap is either manually or mechanically sieved as large, medium and small three sections by 8.1, and by the evenest for the Folium Camelliae sinensis of each section Heap, and accurate quantitative analysis loads in moisture-proof container standby；

During 8.2 manual segmentation, must ensure that each screening amount and action are basically identical；

During 8.3 mechanical grading, plant equipment cleanliness without any pollution must be ensured, and control well into tea amount；

8.4 containers to clean dry, quantitatively wants accurately；

9) tinning

9.1 caddys need to use new tank, it is desirable to specification is consistent, cleanliness without any pollution；

9.2 capacity determined according to every tank, are weighed in tank respectively in large, medium and small three sections of unified ratios；

Suitably to vibrate during 9.3 tinning, fill after just cover tightly and be advisable；

10) seal, label

10.1 every tanks adhesive tape seals, and sealing is wanted firmly；

10.2 labels to be unified to print, and content includes: title, the name of an article, grade, the scope of application, production unit, making date；

11) packaging

11.1 same teas packaging kits；

11.2 outer package should unify to make, it is desirable to cleaning, firmly, and reference name, the name of an article, grade, quantity, production unit.

Embodiment 3

Outlet green tea, mee tea cold water open soup inspection reviewing method, make to stick to the additive on Folium Camelliae sinensis surface with cold water soak, stirring It is suspended in water, with reference to sample comparison soup color, precipitate, more effectively evaluates whether Folium Camelliae sinensis colours, adulterates and do not conform to containing other Lattice Folium Camelliae sinensis etc..

1. apparatus

1.1 comment teacup: colourless, transparent cylindrical glass, high about 15 mm, diameter about 6 mm；

1.2 comment teacup (: Folium Camelliae sinensis inspection is evaluated routine and is commented teacup, pure white porcelain to fire, high 55 mm, external diameter 95 mm suitable for reading, internal diameter 89 mm, capacity 200 mL；

1.3 blade chassis: white enamel tray, long 23 cm, wide 17 cm, high 3 cm；

1.4 net spoons: stainless steel cloth system, the end, is circular, 24 mesh；

1.5 stirring rod, are about 30 cm；

1.6 balances: sensibility reciprocal 0.1 g；

1.7 timing clock or Sha Shiji；

1.8 teaspoon；

1.9 are filled with water kettle.

2. operational approach

2.1 weigh 10 g samples and respectively with reference to sample, are placed in glass, inject cold water 200ml(room temperature).

2.2 in cup infusion of tea to 2 minutes, 5 minutes, 8 minutes time, respectively with stirring rod in glass by same Direction respectively stirs 20 times.

2.3 after infusion of tea in cup to 10 minute, the millet paste in glass and Folium Camelliae sinensis is all poured into and is placed with filter screen Evaluate in bowl, and Folium Camelliae sinensis in net is poured in white enamel dish to be checked.

After 2.4 millet paste stand about 2 minutes in bowl, pour in bare glass cup, first evaluate the depth of soup color, transparency And float, review and comment the precipitate in bowl.

2.5 add at the bottom of appropriate cold water drift leaf in white enamel tray, evaluate leaf background color pool and with or without other defective Folium Camelliae sinensis And impurity.

Embodiment 4

Outlet green tea, the mee tea doping suspicious item method of inspection

1. profile, endoplasm evaluate discovery suspicious non-tea substance, defective Folium Camelliae sinensis, materials 200 grams, stand-by (can expand if desired Quantity).

2. said sample single flat is laid in sample dish, picks out all kinds of suspicious non-tea substance and defective Folium Camelliae sinensis, and claim Weight (being accurate to 0.01 gram), calculates it and accounts for test specimen proportions.

3. weigh from the suspicious non-tea substance picked out and defective Folium Camelliae sinensis no less than 5 grams, detect water extraction.

4. the water extraction content (>=34%) of above-mentioned water extraction detection value with GB/T 14456.1 is compared.

5. judge

Detection value is less than 34%, then product is accused of adding non-teas material, there is adulteration situation.

Test example

1., wherein there is doping Folium Camelliae sinensis 2 (coloring and add-back in proof procedure: extraction 10, green tea sample, 5, mee tea sample altogether Each 1 of cage tea), Tea Samples is made blind sample, and tests by standardization program and evaluate.

2. checking data analysis: by inspection, finds that cold water is opened soup and can substantially be distinguished that coloring liquor color has exception, remaining Folium Camelliae sinensis by with differentiate that sample comparison is it has also been found that Tea Processing and the difference of class.Abnormal Folium Camelliae sinensis and normal Folium Camelliae sinensis are chosen again Choosing and by Appendix D carry out detect data as follows: be accused of containing steam again tea water extraction result all far below standard 34%, remaining is just Often Folium Camelliae sinensis all can reach 34%.From the point of view of organoleptic examination and test in laboratory data, this method can effectively differentiate adulteration tea Leaf.

Claims (2)

1. a Folium Camelliae sinensis cold water opens soup inspection reviewing method, it is characterised in that the method comprises the following steps:

1) weigh 10 g samples respectively and with reference to sample, room temperature, be placed in glass, inject cold water 200ml；

2) in cup infusion of tea to 2 minutes, 5 minutes, 8 minutes time, respectively with stirring rod the most each in glass Stir 20 times；

3) after infusion of tea in cup to 10 minute, the millet paste in glass and Folium Camelliae sinensis are all poured into be placed with filter screen evaluate bowl In, and Folium Camelliae sinensis in net is poured in white enamel dish to be checked；

4) after millet paste stands 2 minutes in bowl, pour in bare glass cup, first evaluate the depth of soup color, transparency and float, then Evaluate the precipitate in bowl；

5) add in white enamel tray at the bottom of appropriate cold water drift leaf, evaluate leaf background color pool and with or without other defective Folium Camelliae sinensis and miscellaneous Matter.

A kind of Folium Camelliae sinensis cold water the most according to claim 1 opens soup inspection reviewing method, it is characterised in that the method is applied to Outlet green tea or mee tea inspection are evaluated.