CN111919916B - Scenting method of jasmine tea - Google Patents
Scenting method of jasmine tea Download PDFInfo
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- CN111919916B CN111919916B CN202010811427.5A CN202010811427A CN111919916B CN 111919916 B CN111919916 B CN 111919916B CN 202010811427 A CN202010811427 A CN 202010811427A CN 111919916 B CN111919916 B CN 111919916B
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F3/00—Tea; Tea substitutes; Preparations thereof
- A23F3/06—Treating tea before extraction; Preparations produced thereby
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F3/00—Tea; Tea substitutes; Preparations thereof
- A23F3/40—Tea flavour; Tea oil; Flavouring of tea or tea extract
- A23F3/405—Flavouring with flavours other than natural tea flavour or tea oil
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Abstract
The invention discloses a scenting method of jasmine tea, which comprises the following steps: the method comprises the steps of pretreating fresh flowers, pretreating tea leaves, filling, circulating air flow scenting, and freeze drying. The invention separates tea from jasmine flower by using hydrophobic and breathable film, and scents by using circulating air flow. The preparation method provided by the invention comprises the following steps: the process is simple, the production efficiency is high, the production cost is low, and the prepared jasmine tea has strong fragrance, mellow taste, no residue and good quality.
Description
Technical Field
The invention belongs to the field of tea processing, and particularly relates to a scenting method of jasmine tea.
Background
The tea has the characteristic of absorbing smell, and can be used for perfuming, so that a plurality of flower-fragrance teas such as jasmine, yulan, rose, chloranthus, sleeve and the like are created by utilizing the characteristic of the tea in China for a long time, wherein jasmine tea essence is favored by consumers at home and abroad in a manner of being fragrant, elegant, fresh, smart and sweet. The traditional experience shows that the lower the water content of the tea is, the stronger the moisture absorption capacity is, and the stronger the aroma absorption capacity is, so the tea needs to be dried to prepare the water content of not more than 8 percent before aroma is absorbed, but along with the research on the aroma absorption capacity of the tea, the water content of the tea is found to be kept to have obvious aroma absorption capacity within a wider range, so the humidification continuous scenting production process of jasmine tea is developed, the humidified tea is uniformly mixed with the jasmine flower, the stacking scenting is carried out, aromatic molecules in the jasmine flower and water molecules in the tea are combined in a hydrogen bond reversible or complexing state, and the moisture is taken as a carrier to gradually permeate and diffuse to the inner layer of the tea, so the aim of aroma absorption of the tea is achieved. However, the humidification continuous scenting process enables the tea to be in direct contact with the jasmine, although aromatic substances of the jasmine can be absorbed by the tea quickly, moisture in the jasmine can be absorbed by the tea, activity is reduced after the jasmine loses water, fragrance-emitting capability is reduced, and the tea is not good for re-absorbing aromatic substances due to too high water content, meanwhile, mould is easy to breed, and vitamin and chlorophyll content is reduced. The conventional widely applied wet continuous scenting process needs repeated scenting, screening and baking for many times, the production period is long, the efficiency is low, the scenting tea leaves and jasmine flowers are not easy to completely screen, a small amount of jasmine flower residues cause bitter tea leaves, and the artificial removal can obviously increase the production cost. Therefore, a novel jasmine tea scenting method is developed, and the economic benefit is great.
Disclosure of Invention
Based on the background, the invention develops a novel jasmine tea scenting method aiming at the prior art, which can obviously improve scenting efficiency, reduce production cost and improve scenting quality.
The invention provides a jasmine tea scenting method, which comprises the following steps:
(1) Pretreatment of fresh flowers: picking mature jasmine flower buds without plant diseases and insect pests and full particles in the evening of sunny days, placing the buds in a bamboo basket for containing, avoiding compaction, spreading and airing at a shady and ventilated place, controlling the environment temperature and spreading thickness, turning over according to frequency, avoiding that the bottom layer temperature exceeds 39 ℃, and obtaining the pretreated jasmine flower when more than 90% of the flower buds are in tiger claw shape;
(2) Pretreatment of tea leaves: selecting green tea with two or more stages of drying, spreading uniformly, spraying clean water, controlling the water content of the tea blank to be 10% -15%, so as to obtain the pretreated tea;
(3) Filling: according to a certain flower distribution amount, after the jasmine flowers and the tea leaves treated in the step (1) and the step (2) are equally divided, filling the jasmine flowers and the tea leaves into specially-made multi-layer hydrophobic and breathable film bags at intervals, keeping a certain paving thickness, and sealing the bag openings of all layers;
(4) And (5) air flow circulation scenting: fixing the multi-layer hydrophobic and breathable film bags treated in the step (3) in a sealed box with a circulating airflow pipeline, setting the temperature and airflow velocity in the box, blowing airflow upwards from the bottom, circulating and guiding the airflow through the circulating pipeline after sequentially passing through each layer of hydrophobic and breathable film bags, blowing upwards again from the bottom, and circulating the airflow for scenting for a certain time, wherein the scenting of jasmine tea is completed after the jasmine tea absorbing aromatic substances reach the corresponding grade product quality indexes;
(5) And (3) freeze drying: taking out the jasmine flowers and the tea leaves treated in the step (4), airing the jasmine flowers at room temperature for a certain time, recycling the jasmine flowers for processing low-grade tea leaves, putting the tea leaves into a freeze drying box, setting vacuum degree, temperature and time, performing freeze drying treatment on the tea leaves, and vacuum packaging to obtain finished jasmine tea products;
preferably, the environmental temperature in the step (1) is 34-37 ℃, the spreading thickness is 11-15 cm, and the flipping frequency is 1 time/30 min.
Preferably, the flower distribution amount in the step (3) is 40-45 kg of flowers for every 100kg of secondary tea blanks, 60-65 kg of flowers for every 100kg of primary tea blanks, and 70-75 kg of flowers for every 100kg of special tea blanks.
Preferably, the filling in the step (3) is that jasmine flowers and tea leaves are alternately distributed layer by layer, the bottommost layer and the highest layer are all jasmine flower layers, the number of the tea leaf layers is 1-6, and the minimum number of the jasmine flower layers is 2-7.
Preferably, the paving thickness in the step (3) is 6-10 cm, and the tea layer thickness is 6-8 cm.
Preferably, the special multi-layer hydrophobic and breathable film bag in the step (3) is prepared from an E-PTFE microporous film, wherein sealing layering is arranged at the bag opening of each layer, and the average pore diameter of micropores is 5-10 mu m.
The hydrophobic and breathable film can allow air flow to pass through and take away aromatic substances emitted by jasmine, but can effectively prevent water vapor from passing through, so that the water loss of the jasmine is prevented; and the aromatic substances are absorbed by the tea after being humidified.
Preferably, in the step (4), the temperature in the box is 35-42 ℃, the airflow speed is 4-6 m/s, and the circulating scenting time is 8-12 hours.
The circulating air flow can not only take away the aromatic substances emitted by the jasmine flowers, but also possibly take away the heat generated by the jasmine flowers and the tea leaves during scenting, so that the overhigh temperature of the jasmine flower layer and the tea leaf layer is avoided, and the temperature in the box is always kept in a set range through the regulation and control of the temperature control system.
Preferably, the jasmine flower in the step (5) is spread and dried for 1-3 hours at room temperature, the vacuum degree of tea leaf freeze drying is 200-500 Pa, the temperature is-30-5 ℃, and the time is 10-12 hours.
Compared with the prior art, the invention has the beneficial effects that:
(1) The hydrophobic and breathable film is utilized to separate tea from jasmine, and the circulating air flow is adopted to take away aromatic substances emitted by the jasmine, but not take away the moisture of the jasmine, so that the activity reduction of the jasmine after water loss is avoided, the jasmine has long fragrance-emitting time, large fragrance-emitting amount and low fragrance-emitting amount.
(2) The circulating air flow blowing from bottom to top can fully take away heat generated by the jasmine flower layer and the tea leaf layer during scenting, and the temperature in the box is always kept in a set range through the regulation and control of the temperature control device, so that the flower ventilation and heat dissipation links in the traditional process are saved, and the continuous fragrance-emitting capability of the jasmine flowers and the continuous fragrance-absorbing capability of the tea leaves are ensured;
(3) The circulating air flow scenting avoids the multiple scenting, screening and baking procedures of the traditional process, remarkably improves the production efficiency, separates tea from jasmine, avoids the screening procedure of the traditional process, improves the production efficiency, reduces the production cost, and the prepared jasmine tea has strong fragrance, no jasmine residue and good quality.
Detailed Description
The invention provides a jasmine tea scenting method, which comprises the following steps:
(1) Pretreatment of fresh flowers: picking mature jasmine flower buds without plant diseases and insect pests and full particles in the evening of sunny days, placing the buds in a bamboo basket for containing, avoiding compaction, spreading and airing at a shady and ventilated place, controlling the environment temperature and spreading thickness, turning over according to frequency, avoiding that the bottom layer temperature exceeds 39 ℃, and obtaining the pretreated jasmine flower when more than 90% of the flower buds are in tiger claw shape;
(2) Pretreatment of tea leaves: selecting green tea with two or more stages of drying, spreading uniformly, spraying clean water, controlling the water content of the tea blank to be 10% -15%, so as to obtain the pretreated tea;
(3) Filling: according to a certain flower distribution amount, after the jasmine flowers and the tea leaves treated in the step (1) and the step (2) are equally divided, filling the jasmine flowers and the tea leaves into specially-made multi-layer hydrophobic and breathable film bags at intervals, keeping a certain paving thickness, and sealing the bag openings of all layers;
(4) And (5) air flow circulation scenting: fixing the multi-layer hydrophobic and breathable film bags treated in the step (3) in a sealed box with a circulating airflow pipeline, setting the temperature and airflow velocity in the box, blowing airflow upwards from the bottom, circulating and guiding the airflow through the circulating pipeline after sequentially passing through each layer of hydrophobic and breathable film bags, blowing upwards again from the bottom, and circulating the airflow for scenting for a certain time, wherein the scenting of jasmine tea is completed after the jasmine tea absorbing aromatic substances reach the corresponding grade product quality indexes;
(5) And (3) freeze drying: taking out the jasmine flowers and the tea leaves treated in the step (4), airing the jasmine flowers at room temperature for a certain time, recycling the jasmine flowers for processing low-grade tea leaves, putting the tea leaves into a freeze drying box, setting vacuum degree, temperature and time, and carrying out freeze drying treatment on the tea leaves, and vacuum packaging to obtain finished jasmine tea products.
Preferably, the environmental temperature in the step (1) is 34-37 ℃, the spreading thickness is 11-15 cm, and the flipping frequency is 1 time/30 min.
Preferably, the flower distribution amount in the step (3) is 40-45 kg of flowers for every 100kg of secondary tea blanks, 60-65 kg of flowers for every 100kg of primary tea blanks, and 70-75 kg of flowers for every 100kg of special tea blanks.
Preferably, the filling in the step (3) is that jasmine flowers and tea leaves are alternately distributed layer by layer, the bottommost layer and the highest layer are all jasmine flower layers, the number of the tea leaf layers is 1-6, and the minimum number of the jasmine flower layers is 2-7.
Preferably, the paving thickness in the step (3) is 6-10 cm, and the tea layer thickness is 6-8 cm.
Preferably, the special multi-layer hydrophobic and breathable film bag in the step (3) is prepared from an E-PTFE microporous film, wherein sealing layering is arranged at the bag opening of each layer, and the average pore diameter of micropores is 5-10 mu m.
Preferably, in the step (4), the temperature in the box is 35-42 ℃, the airflow speed is 4-6 m/s, and the circulating scenting time is 8-12 hours.
Preferably, the jasmine flower in the step (5) is spread and dried for 1-3 hours at room temperature, the vacuum degree of tea leaf freeze drying is 200-500 Pa, the temperature is-30-5 ℃, and the time is 10-12 hours.
The technical scheme of the invention will be further described in detail below with reference to specific embodiments. The following examples are illustrative only and are not to be construed as limiting the scope of the invention. All techniques implemented based on the above description of the invention are intended to be included within the scope of the invention.
Unless otherwise indicated, the starting materials and reagents used in the following examples were either commercially available or may be prepared by known methods.
Example 1
Picking mature jasmine flower buds without plant diseases and insect pests and full particles in the evening of sunny days, placing the buds in a bamboo basket to be contained, avoiding compaction, spreading and airing at a shady and ventilated place, controlling the environment temperature to be 34 ℃, spreading and airing to be 11cm thick, turning 1 time every 30min, avoiding the bottom layer temperature to exceed 39 ℃, and obtaining pretreated jasmine flowers when more than 90% of the flower buds are in tiger claw shape; selecting a green-drying secondary green tea green, uniformly spreading, and spraying pure clean water to control the water content of the green tea green to 11%, thereby obtaining pretreated tea; according to 42kg of flowers of each 100kg of two-stage tea blank, after equal amount and equal division of the pretreated jasmine flowers and tea leaves, alternately filling the jasmine flowers and the tea leaves into a plurality of layers of hydrophobic and breathable film bags prepared by E-PTFE microporous films with the average pore diameter of 8 mu m layer by layer, filling the jasmine flowers with 4 layers, wherein the bottommost layer and the highest layer are jasmine flower layers, the filling thickness of each jasmine flower layer is 6cm, filling the tea leaves with 3 layers, the filling thickness of each tea leaf layer is 6cm, after compacting the sealing layering of the openings of the bag layers, fixing the hydrophobic and breathable film bags in a sealing box with a circulating airflow pipeline, setting the temperature in the box to be 36 ℃, circularly introducing the airflow at the airflow speed of 4m/s from the bottom, circularly introducing the airflow through the circulating pipeline after sequentially passing through each layer of hydrophobic and breathable film bags, blowing the airflow from the bottom upwards again, circularly scenting the airflow for 12h, so that the jasmine flower aromatic substances absorbed by the tea leaves reach the quality grade of the two-stage jasmine tea, taking out the jasmine flowers and the tea leaves from the scenting bags, airing the jasmine flower bags for 1h, setting the temperature to be used for low-grade tea leaves, setting the temperature in the box to be at the temperature of 200Pa, and setting the vacuum drying temperature to be the tea leaves to be dried, and vacuum drying the tea leaves to be dried, and vacuum-packaged tea leaves to be dried.
Example 2
Picking mature jasmine flower buds without plant diseases and insect pests and full particles in the evening of sunny days, placing the buds in a bamboo basket to be contained, avoiding compaction, spreading and airing at a shady and ventilated place, controlling the environment temperature to be 35 ℃, spreading and airing to be 13cm in thickness, turning 1 time every 30min, avoiding the bottom layer temperature to exceed 39 ℃, and obtaining pretreated jasmine flowers when more than 90% of the flower buds are in tiger claw shape; selecting a first-stage green tea blank, uniformly spreading, spraying pure clean water, controlling the water content of the tea blank to be 13% to obtain pretreated tea; according to 63kg of flower distribution per 100kg of first-stage tea, after equal amount and equal division of the pretreated jasmine flower and tea, alternately filling the jasmine flower and the tea into a plurality of layers of hydrophobic and breathable film bags prepared by E-PTFE microporous films with the average pore diameter of 9 mu m layer by layer, filling the jasmine flower with 5 layers, wherein the bottommost layer and the highest layer are jasmine flower layers, the filling thickness of each layer of jasmine flower is 8cm, filling the tea with 4 layers, the filling thickness of each layer of tea is 7cm, after compacting the sealing layering of the openings of the bags, fixing the hydrophobic and breathable film bags in a sealing box with a circulating airflow pipeline, setting the temperature in the box to be 38 ℃, the airflow velocity to be 5m/s, circularly introducing the airflow through the circulating pipeline after sequentially passing through the layers of hydrophobic and breathable film bags, blowing the airflow from the bottom to the top again, circularly scenting the airflow for 10h, so that the jasmine flower aromatic substances absorbed by the tea reach the quality grade of the first-stage jasmine tea, taking the jasmine flower and the tea out of the bags after scenting, airing the jasmine flower for 2h, drying the jasmine flower at room temperature, setting the temperature to be 350Pa, and the vacuum drying the tea in the sealing box, and carrying out vacuum drying and vacuum drying to obtain the finished tea, and vacuum-drying the tea after setting the temperature to be 350Pa, and vacuum drying and the finished tea.
Example 3
Picking mature jasmine flower buds without plant diseases and insect pests and full particles in the evening of sunny days, placing the buds in a bamboo basket to be contained, avoiding compaction, spreading and airing at a shady and ventilated place, controlling the environment temperature to be 36 ℃, spreading and airing to be 14cm thick, turning 1 time every 30min, avoiding the bottom layer temperature to exceed 39 ℃, and obtaining pretreated jasmine flowers when more than 90% of the flower buds are in tiger claw shape; selecting a baked special grade green tea green, uniformly spreading, and spraying pure clean water to control the water content of the green tea green to 15% to obtain pretreated tea; and (3) after each 74kg of special grade tea blank is subjected to flower distribution, uniformly dividing the pretreated jasmine flowers and tea leaves by equal amount, alternately filling the jasmine flowers and the tea leaves into a plurality of layers of hydrophobic and breathable film bags prepared by E-PTFE microporous films with the average pore diameter of 10 mu m layer by layer, filling the jasmine flowers into 6 layers, wherein the bottommost layer and the highest layer are jasmine flower layers, the paving thickness of each jasmine flower layer is 9cm, filling the tea leaves into 5 layers, the paving thickness of each tea leaf layer is 8cm, fixing the hydrophobic and breathable film bags in a sealing box with a circulating air flow pipeline after pressing sealing layering of the bag openings, setting the temperature in the box to be 41 ℃, circularly introducing the air flow velocity to the air flow from the bottom to the upper side through the circulating pipeline, circularly introducing the air flow from the bottom to the air flow to the upper side again, circularly scenting the air flow for 8 hours, so that the jasmine flowers and the tea leaves are absorbed by the aromatic substances of the tea leaves to reach the quality grade of the special grade jasmine tea, taking out the jasmine flowers and the tea leaves after scenting, spreading the jasmine flower and the tea leaves for 3 hours, airing at the room temperature for 3 hours, setting the temperature in the sealing box to be at the low grade, setting the temperature to be 10 Pa, and setting the vacuum drying temperature to be 10 Pa, and the vacuum drying and the tea leaves to be dried, and the vacuum-packaged tea leaves.
Table 1 shows the sensory quality of the jasmine tea prepared in examples 1-3, and it can be seen from the table that the jasmine tea prepared in examples 1-3 has strong and durable fragrance, mellow taste, complete leaves, no broken slag, fresh white jasmine slag after scenting, and residual fragrance, and can be recycled.
Table 1 shows the sensory qualities of jasmine tea prepared in examples 1 to 3
| Jasmine flower slag state | Tea state | Tea soup feel | |
| Example 1 | Fresh white with aftertaste | The blade is complete and has no slag | Aromatic and durable fragrance and mellow and refreshing taste |
| Example 2 | Fresh white with aftertaste | The blade is complete and has no slag | Aromatic and durable fragrance and mellow and refreshing taste |
| Example 3 | Fresh white with aftertaste | The blade is complete and has no slag | The fragrance is rich and durable, and the taste is mellow |
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. The scenting method of the jasmine tea is characterized by comprising the following steps of:
(1) Pretreatment of fresh flowers: picking ripe jasmine flower buds without plant diseases and insect pests and plump grains, placing the jasmine flower buds in a bamboo basket for containing, avoiding compaction, spreading and airing at a shady and ventilated place, controlling the environment temperature and spreading thickness, turning over according to frequency, avoiding the bottom layer temperature to exceed 39 ℃, and obtaining the pretreated jasmine flower when more than 90% of the flower buds are in tiger claw shape;
(2) Pretreatment of tea leaves: selecting green tea with two or more stages of drying, spreading uniformly, spraying clean water, controlling the water content of the tea blank to be 10% -15%, so as to obtain the pretreated tea;
(3) Filling: according to a certain flower distribution amount, after the jasmine flowers and the tea leaves treated in the step (1) and the step (2) are equally divided, filling the jasmine flowers and the tea leaves into specially-made multi-layer hydrophobic and breathable film bags at intervals, keeping a certain paving thickness, and sealing the bag openings of all layers;
(4) And (5) air flow circulation scenting: fixing the multi-layer hydrophobic and breathable film bags treated in the step (3) in a sealed box with a circulating airflow pipeline, setting the temperature and airflow velocity in the box, blowing airflow upwards from the bottom, circulating and guiding the airflow through the circulating pipeline after sequentially passing through each layer of hydrophobic and breathable film bags, blowing upwards again from the bottom, and circulating the airflow for scenting for a certain time, wherein the scenting of jasmine tea is completed after the jasmine tea absorbing aromatic substances reach the corresponding grade product quality indexes;
(5) And (3) freeze drying: taking out the jasmine flowers and the tea leaves treated in the step (4), airing the jasmine flowers at room temperature for a certain time, recycling the jasmine flowers for processing low-grade tea leaves, putting the tea leaves into a freeze drying box, setting vacuum degree, temperature and time, performing freeze drying treatment on the tea leaves, and vacuum packaging to obtain finished jasmine tea products;
the environmental temperature in the step (1) is 34-37 ℃, the spreading thickness is 11-15 cm, and the flipping frequency is 1 time/30 min;
the flower distribution amount in the step (3) is 40-45 kg of flower distribution per 100kg of secondary tea blank, 60-65 kg of flower distribution per 100kg of primary tea blank, and 70-75 kg of flower distribution per 100kg of special tea blank;
the jasmine flowers and the tea leaves are alternately filled in the step (3) layer by layer, the bottommost layer and the highest layer are all jasmine flower layers, the number of the tea leaf layers is 1-6, and the number of the jasmine flower layers is at least 2;
the paving thickness in the step (3) is 6-10 cm, and the tea layer thickness is 6-8 cm;
the special multi-layer hydrophobic and breathable film bag in the step (3) is prepared from an E-PTFE microporous film, a sealing layering is arranged at the bag opening of each layer, and the average pore diameter of micropores is 5-10 mu m;
the temperature in the box in the step (4) is 35-42 ℃, the airflow speed is 4-6 m/s, and the circulating scenting time is 8-12 h;
and (3) the jasmine flower in the step (5) is spread and dried for 1-3 hours at room temperature, the vacuum degree of tea leaf freeze drying is 200-500 Pa, the temperature is-30-5 ℃, and the time is 10-12 hours.
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| CN104543248A (en) * | 2015-01-06 | 2015-04-29 | 广西职业技术学院 | Scenting method of clean scented tea |
| CN109329525A (en) * | 2018-12-13 | 2019-02-15 | 福建农林大学 | The method of airflow circulating scenting jasmine tea |
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