Jasmine flower and apocynum venetum scenting process and composite scented tea prepared by using same

Abstract

The invention relates to the technical field of tea processing, and discloses a jasmine flower and apocynum venetum scenting technology and composite scented tea prepared through the jasmine flower and apocynum venetum scenting method.The technology comprises the following steps that raw material pretreatment is conducted, specifically, jasmine flowers and apocynum venetum are screened and pretreated, and cleaned and drained fresh jasmine flowers and dried apocynum venetum tea with the water content of 8%-10% are obtained; primary scenting: mixing the fresh jasmine flowers obtained in the step 1 with the dried apocynum venetum tea, uniformly spreading the mixture in a scenting tank, performing stacking scenting, screening out the dried apocynum venetum tea after scenting is finished, and performing drying until the water content is 12%-13%. The scenting temperature and time are controlled in stages, so that the jasmine flowers continuously release fragrance, and meanwhile, active ingredients such as flavonoids in the apocynum venetum are prevented from being damaged by high temperature; apocynum venetum crushing and multiple turning operations improve aroma adsorption and active ingredient release efficiency, and multiple turning ensures uniform heating of raw materials and sufficient aroma adsorption.

Description

Technical Field

[0001] This invention relates to the field of tea processing technology, and in particular to a jasmine-scented hemp processing technique and the resulting compound flower tea. Background Art

[0002] Current scenting methods for tea mostly involve pairing a single flower with traditional tea leaves, focusing primarily on flavor enhancement rather than deep integration with plants possessing health benefits. Apocynum venetum contains active ingredients such as flavonoids and steroids, which can lower blood pressure and cholesterol; however, Apocynum venetum tea processed alone often suffers from a rough texture and monotonous flavor due to its simple roasting or drying process.

[0003] Existing scenting techniques still suffer from problems when processing combinations of raw materials with different characteristics, such as improper temperature and time control, unreasonable raw material ratios, and a lack of specificity in the number of scenting cycles and stacking thickness. These issues lead to aroma loss, insufficient release of active ingredients, and unstable product quality. A search revealed no patented technology for scenting jasmine flowers with Apocynum venetum, indicating a pressing market need for a composite flower tea product that combines floral fragrance with health benefits. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a jasmine flower scenting process using Apocynum venetum and the resulting compound flower tea.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A jasmine-scented hemp processing method includes the following steps:

[0007] S1. Raw material pretreatment: Jasmine flowers and Apocynum venetum are screened and pretreated to obtain fresh jasmine flowers after washing and draining, and dried Apocynum venetum tea with a moisture content of 8%-10%.

[0008] S2. First Scenting: Mix the fresh jasmine flowers and dried Apocynum venetum tea obtained in step 1 and spread them evenly in the scenting trough. Stack them up for scenting. After the scenting is completed, sift out the dried Apocynum venetum tea and dry it until the moisture content is 12%-13%.

[0009] S3. Second Scenting: Mix fresh jasmine flowers with the dried Apocynum venetum tea after the first scenting, pile them up for scenting, and after the scenting is completed, sift out the dried Apocynum venetum tea and dry it until the moisture content is 10%-11%;

[0010] S4. Third Scenting: Mix fresh jasmine flowers with the dried Apocynum venetum tea after the second scenting, pile them up for scenting, and after the scenting is completed, sift out the dried Apocynum venetum tea and dry it until the moisture content is 6%-7%;

[0011] S5. Packaging: After the third scenting process, the dried Apocynum venetum tea is sieved to remove impurities and then packaged to prevent the finished tea from coming into contact with air, which would cause the aroma to evaporate and the tea to become damp and deteriorate.

[0012] In steps S2, S3, and S4, the ratio of fresh jasmine flowers to dried Apocynum venetum tea, the scenting temperature, the scenting time, and the stacking thickness are all gradually reduced.

[0013] Preferably, in step S1, the specific method for screening and pre-treating jasmine flowers is as follows: select fresh jasmine flowers in a semi-open state with petals that are 60%-70% open, remove the calyx, pedicel and damaged flowers, rinse with clean water, and place in a cool and ventilated place to drain.

[0014] Preferably, the rinsing time with clean water is 10-15 seconds, and the water temperature is 20-25℃; the draining time is 30-40 minutes, and the moisture content is 75%-80%, to avoid excessive moisture leading to mold, while ensuring the activity of the flowers to continuously release fragrance.

[0015] Preferably, in step S1, the specific method for screening and pre-processing Apocynum venetum is as follows: select tender leaves of current year's Apocynum venetum, and after killing, rolling, and drying, pulverize them to a particle size of 2-3 mm to increase the contact area with jasmine flowers, improve the efficiency of aroma adsorption and release of active ingredients, and obtain dried Apocynum venetum tea. The pulverization process and frequent turning of Apocynum venetum improve the efficiency of aroma adsorption and release of active ingredients.

[0016] Preferably, the blanching temperature of Apocynum venetum is 120-130℃ for 2-3 minutes; the kneading machine speed is 40-50 r / min for 15-20 minutes; and the drying temperature is 80-90℃ for 2-2.5 hours.

[0017] Preferably, in step S2, the specific method for the first scenting is as follows: jasmine flowers are mixed with the first-scented Apocynum venetum dried tea at a mass ratio of 1:2.5-1:3. This ratio avoids the jasmine aroma from overpowering the Apocynum venetum flavor while ensuring sufficient basic aroma adsorption. The stacking thickness is 15-20cm. If the stacking is too thick, the internal temperature will be too high, causing the jasmine flowers to wither; if it is too thin, the aroma will easily diffuse and be lost. The tea is left to scent at 28-30℃ and 70%-75% relative humidity for 10-12 hours, and turned over every 3-4 hours. After the scenting is completed, the Apocynum venetum dried tea is sieved out and placed in a hot air dryer for preliminary drying to remove excess moisture adsorbed on the surface and prevent mold growth during subsequent scenting processes. The drying temperature is 60-65℃, and the drying time is 1-1.5 hours.

[0018] Preferably, in step S3, the specific method for the second scenting is as follows: fresh jasmine flowers are mixed with the first-scented Apocynum venetum tea at a mass ratio of 1:3.5-1:4, reducing the amount of jasmine flowers used to avoid excessive aroma accumulation. The pile thickness is 12-15cm, and the tea is left to scent for 8-10 hours at 26-28℃ and 65%-70% relative humidity, turning it over every 4-5 hours. After the scenting is completed, the dried Apocynum venetum tea is sieved out and dried again at a drying temperature of 55-60℃ for 0.8-1 hour.

[0019] Preferably, in step S4, the specific method for the third scenting is as follows: fresh jasmine flowers are mixed with the second-scented Apocynum venetum tea at a mass ratio of 1:4.5-1:5 to further reduce the proportion of jasmine flowers and achieve a balance between aroma and flavor of Apocynum venetum. The mixture is piled to a thickness of 10-12 cm and left to scent for 6-8 hours at 25-26℃ and 60%-65% relative humidity, turning it over every 5-6 hours. After scenting, the dried Apocynum venetum tea is sieved out and dried under vacuum of -0.08-0.09 MPa and 50-55℃ for 1.5-2 hours. The vacuum environment can reduce the loss of aroma during the drying process while retaining the active ingredients in Apocynum venetum.

[0020] Preferably, both the first and second scenting processes use a vibrating screen with a 5mm mesh size to separate jasmine flowers and dried Apocynum venetum tea.

[0021] Preferably, the third scenting process uses a vibrating screen with a mesh size of 1.5-2mm to separate jasmine flowers and dried Apocynum venetum tea.

[0022] A compound flower tea is produced using the above-mentioned jasmine and Apocynum venetum scenting process.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. Dual Preservation of Aroma and Active Ingredients: The scenting process involves phased control of temperature and time, allowing jasmine flowers to continuously release their aroma while avoiding high temperatures that could damage the flavonoids and other active ingredients in the Apocynum venetum. The crushing and repeated turning of the Apocynum venetum enhances aroma adsorption and active ingredient release efficiency, while also ensuring even heating and full aroma absorption. Testing shows that the total flavonoid content is 15%-20% higher than traditional Apocynum venetum tea, and the jasmine aroma retention rate is 25%-30% higher.

[0025] 2. Optimize the balance of taste and flavor: The amount of jasmine flowers is gradually reduced during the three scenting processes to avoid "fragrance overpowering taste" or weak aroma; the fixation and rolling of Apocynum venetum improves the taste, making the finished tea smooth on the palate, with both sweet floral fragrance and light herbal flavor.

[0026] 3. Improve quality stability and shelf life: Targeted stacking thickness and temperature and humidity control reduce the risk of mold; final vacuum drying stabilizes the moisture content of the finished tea at 6%-7%, extending the shelf life to 18 months, and the flavor consistency error between different batches is ≤5%.

[0027] 4. Filling market gaps and increasing added value: For the first time, jasmine flowers and Apocynum venetum are blended in the scenting process to form a "flavor and efficacy" compound tea product, which is suitable for the health drinks of middle-aged and elderly people and the high-end flower tea market. The product profit margin can be increased by 30%-40%. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Example 1

[0030] Select fresh jasmine flowers that are semi-open with petals at 60% of their full extent. Remove the sepals, stems, and any damaged flowers. Rinse with clean water for 10 seconds at 20°C. After rinsing, place the flowers in a cool, well-ventilated place to drain for 30 minutes until the moisture content is 75%.

[0031] The specific methods for screening and pretreatment of Apocynum venetum are as follows: Select tender leaves of current year's Apocynum venetum, and after processing such as fixation, rolling, and drying, pulverize them to a particle size of 2mm. Use a drum fixation machine with a rotation speed of 15r / min for fixation at a temperature of 120℃ for 2min; the rolling machine has a rotation speed of 40r / min for 15min; and the drying temperature is 80℃ for 2h to obtain dried Apocynum venetum tea.

[0032] First scenting: Jasmine flowers are mixed with the first-scented Apocynum venetum dried tea at a mass ratio of 1:2.5, piled to a thickness of 15cm, and left to scent for 10 hours at 28℃ and 70% relative humidity, turning it over every 3 hours. After scenting, the Apocynum venetum dried tea is sieved out and placed in a hot air dryer for preliminary drying at 60℃ for 1 hour, until the moisture content is 12%.

[0033] Second scenting: Fresh jasmine flowers are mixed with the first-scented Apocynum venetum tea at a mass ratio of 1:3.5, piled to a thickness of 12cm, and left to scent for 8 hours at 26℃ and 65% relative humidity, turning it over every 4 hours. After scenting, the dried Apocynum venetum tea is sieved out and dried again at 55℃ for 0.8 hours until the moisture content is 10%.

[0034] The third scenting process: Fresh jasmine flowers are mixed with the second scented Apocynum venetum tea at a mass ratio of 1:4.5, and piled to a thickness of 10cm. The mixture is left to stand for 6 hours at 25℃ and 60% relative humidity, and turned over every 5 hours. After the scenting process, the dried Apocynum venetum tea is sieved out and dried at a vacuum of -0.08MPa and 50℃ for 1.5 hours until the moisture content is 6%.

[0035] The dried Apocynum venetum tea after the third scenting process was sieved to remove impurities using a vibrating sieve with a mesh size of 1.5mm. It was then vacuum-packed in aluminum foil, with each bag containing 2g.

[0036] Example 2

[0037] Select fresh jasmine flowers that are semi-open with petals at 70% of their full extent. Remove the sepals, stems, and any damaged flowers. Rinse with clean water for 15 seconds at 25°C. After rinsing, place the flowers in a cool, well-ventilated place to drain for 40 minutes until the moisture content is 80%.

[0038] The specific methods for screening and pretreatment of Apocynum venetum are as follows: Select tender leaves of current year's Apocynum venetum, and after processing by fixation, rolling, and drying, pulverize them to a particle size of 3mm. Use a drum fixation machine with a rotation speed of 20r / min for fixation at a temperature of 130℃ for 3min; the rolling machine speed is 50r / min for 20min; and the drying temperature is 90℃ for 2.5h to obtain dried Apocynum venetum tea.

[0039] First scenting: Mix jasmine flowers with the first-scented Apocynum venetum dried tea at a mass ratio of 1:3, pile the mixture to a thickness of 20cm, and let it stand for 12 hours at 30℃ and 75% relative humidity, turning it over every 4 hours. After the scenting is completed, sift out the Apocynum venetum dried tea and place it in a hot air dryer for preliminary drying at 65℃ for 1.5 hours until the moisture content is 13%.

[0040] Second scenting: Fresh jasmine flowers are mixed with the first-scented Apocynum venetum tea at a mass ratio of 1:4, piled to a thickness of 15cm, and left to scent for 10 hours at 28℃ and 70% relative humidity, turning it over every 5 hours. After scenting, the dried Apocynum venetum tea is sieved out and dried again at 60℃ for 1 hour until the moisture content is 11%.

[0041] The third scenting process: Fresh jasmine flowers are mixed with the second-scented Apocynum venetum tea at a mass ratio of 1:5, piled to a thickness of 12cm, and left to scent for 8 hours at 26℃ and 65% relative humidity, turning it over every 6 hours. After the scenting process, the dried Apocynum venetum tea is sieved out and dried at 55℃ under a vacuum of 0.09MPa for 2 hours until the moisture content is 7%.

[0042] The dried Apocynum venetum tea after the third scenting process was sieved to remove impurities using a vibrating sieve with a mesh size of 2mm. It was then vacuum-packed in aluminum foil, with each bag containing 5g.

[0043] Example 3

[0044] Select fresh jasmine flowers that are semi-open with petals at 65% of their full extent. Remove the sepals, stems, and any damaged flowers. Rinse with clean water for 12 seconds at a water temperature of 23°C. After rinsing, place the flowers in a cool, well-ventilated place to drain for 35 minutes until the moisture content is 78%.

[0045] The specific methods for screening and pretreatment of Apocynum venetum are as follows: Select tender leaves of current year's Apocynum venetum, and after processing by fixation, rolling, and drying, pulverize them to a particle size of 2.5 mm. Use a drum fixation machine with a rotation speed of 17 r / min for fixation at a temperature of 125℃ for 2.5 min. Use a rolling machine with a rotation speed of 45 r / min for 17 min. Use a drying temperature of 85℃ for 2.8 h to obtain dried Apocynum venetum tea.

[0046] First scenting: Jasmine flowers are mixed with the first-scented Apocynum venetum dried tea at a mass ratio of 1:2.7, piled to a thickness of 17cm, and left to scent for 11 hours at 29℃ and 73% relative humidity, turning it over every 3.5 hours. After scenting, the Apocynum venetum dried tea is sieved out and placed in a hot air dryer for preliminary drying at 61℃ for 1.3 hours until the moisture content is 12.5%.

[0047] Second scenting: Fresh jasmine flowers are mixed with the first-scented Apocynum venetum tea at a mass ratio of 1:3.8, piled to a thickness of 13.5 cm, and left to scent for 9 hours at 27℃ and 67% relative humidity, turning it over every 4.5 hours. After scenting, the dried Apocynum venetum tea is sieved out and dried again at 57℃ for 0.9 hours until the moisture content is 10.5%.

[0048] The third scenting process: Fresh jasmine flowers are mixed with the second-scented Apocynum venetum tea at a mass ratio of 1:4.8, piled to a thickness of 11cm, and left to scent for 7 hours at 25.5℃ and 63% relative humidity, turning it over every 5.5 hours. After the scenting process, the dried Apocynum venetum tea is sieved out and dried at 53℃ under vacuum of 0.05MPa for 1.6 hours until the moisture content is 6.5%.

[0049] The dried Apocynum venetum tea after the third scenting process was sieved to remove impurities using a vibrating sieve with a mesh size of 1.8mm. It was then vacuum-packed in aluminum foil, with each bag containing 3.5g.

[0050] Example 4

[0051] Select fresh jasmine flowers that are semi-open with petals at 65% of their full extent. Remove the sepals, stems, and any damaged flowers. Rinse with clean water for 12 seconds at a water temperature of 23°C. After rinsing, place the flowers in a cool, well-ventilated place to drain for 35 minutes until the moisture content is 78%.

[0052] The specific methods for screening and pretreatment of Apocynum venetum are as follows: Select tender leaves of current year's Apocynum venetum, and after processing by fixation, rolling, and drying, pulverize them to a particle size of 2.5 mm. Use a drum fixation machine with a rotation speed of 17 r / min for fixation at a temperature of 125℃ for 2.5 min. Use a rolling machine with a rotation speed of 45 r / min for 17 min. Use a drying temperature of 85℃ for 2.8 h to obtain dried Apocynum venetum tea.

[0053] First scenting: Jasmine flowers are mixed with the first-scented Apocynum venetum dried tea at a mass ratio of 1:1, piled to a thickness of 17cm, and left to scent for 8 hours at 29℃ and 73% relative humidity, turning it over every 3.5 hours. After scenting, the Apocynum venetum dried tea is sieved out and placed in a hot air dryer for preliminary drying at 100℃ for 1.3 hours until the moisture content is 5.5%.

[0054] Second scenting: Fresh jasmine flowers are mixed with the first-scented Apocynum venetum tea at a 1:1 weight ratio, piled to a thickness of 13.5 cm, and left to scent for 8 hours at 27℃ and 67% relative humidity, turning it over every 4.5 hours. After scenting, the dried Apocynum venetum tea is sieved out and dried again at 90℃ for 0.9 hours until the moisture content is 6%.

[0055] The third scenting process: Fresh jasmine flowers are mixed with the second-scented Apocynum venetum tea at a 1:1 mass ratio, piled to a thickness of 11cm, and left to scent for 8 hours at 25.5℃ and 63% relative humidity, turning it over every 5.5 hours. After the scenting process, the dried Apocynum venetum tea is sieved out and dried at a vacuum of 0.05MPa and 75℃ for 1.6 hours until the moisture content is 7.5%.

[0056] The dried Apocynum venetum tea after the third scenting process was sieved to remove impurities using a vibrating sieve with a mesh size of 1.8mm. It was then vacuum-packed in aluminum foil, with each bag containing 3.5g.

[0057] The dried Apocynum venetum tea prepared in Examples 1-3 of this invention was sent to a testing institution with CMA certification for testing. The test results showed that the total flavonoid content was 2.8-3.2 mg / g. In contrast, the total flavonoid content of traditional Apocynum venetum tea is 2.3-2.5 mg / g, proving that this process can improve the retention of active ingredients.

[0058] Fifty professional tea tasters were selected to score the finished tea, traditional Apocynum venetum tea, and single jasmine tea on aroma (3 points), taste (3 points), and flavor balance (4 points). The finished tea scored an average of 8.7 points, the traditional Apocynum venetum tea scored an average of 6.2 points, and the single jasmine tea scored an average of 7.5 points, demonstrating the flavor advantage of this process.

[0059] The finished tea is stored in an environment with a temperature of 25℃ and a relative humidity of 60% for 18 months, and the moisture content (always maintained at 6%-7%) and microbial indicators (total bacterial count ≤100cfu / g, in compliance with GB4806.1-2016 standard) are tested regularly to prove the product's shelf life and quality stability.

[0060] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A jasmine flower scenting process for Apocynum venetum, characterized in that, The following steps are involved: S1. Raw material pretreatment: Jasmine flowers and Apocynum venetum are screened and pretreated to obtain fresh jasmine flowers after washing and draining, and dried Apocynum venetum tea with a moisture content of 8%-10%. S2. First Scenting: Mix the fresh jasmine flowers and dried Apocynum venetum tea obtained in step 1 and spread them evenly in the scenting trough. Stack them up for scenting. After the scenting is completed, sift out the dried Apocynum venetum tea and dry it until the moisture content is 12%-13%. S3. Second Scenting: Mix fresh jasmine flowers with the dried Apocynum venetum tea after the first scenting, pile them up for scenting, and after the scenting is completed, sift out the dried Apocynum venetum tea and dry it until the moisture content is 10%-11%; S4. Third Scenting: Mix fresh jasmine flowers with the dried Apocynum venetum tea after the second scenting, pile them up for scenting, and after the scenting is completed, sift out the dried Apocynum venetum tea and dry it until the moisture content is 6%-7%; S5. Packaging: After the third scenting process, the dried Apocynum venetum tea is sieved to remove impurities and then packaged. In steps S2, S3, and S4, the ratio of fresh jasmine flowers to dried Apocynum venetum tea, the scenting temperature, the scenting time, and the stacking thickness are all gradually reduced.

2. The jasmine flower scenting process for Apocynum venetum according to claim 1, characterized in that, In step S1, the specific method for screening and pre-treatment of jasmine flowers is as follows: Select fresh jasmine flowers that are in a semi-open state with petals that are 60%-70% open, remove the calyx, flower stalks and damaged flowers, rinse with clean water, and place them in a cool and ventilated place to drain.

3. The jasmine flower scenting process for Apocynum venetum according to claim 2, characterized in that, Rinse with clean water for 10-15 seconds at a water temperature of 20-25℃; drain for 30-40 minutes with a moisture content of 75%-80%.

4. The jasmine flower scenting process for Apocynum venetum according to claim 1, characterized in that, In step S1, the specific method for screening and pre-processing Apocynum venetum is as follows: select tender leaves of current year's Apocynum venetum, and after killing the green, rolling, drying and crushing to a particle size of 2-3mm, obtain dried Apocynum venetum tea.

5. The jasmine flower scenting process for Apocynum venetum according to claim 4, characterized in that, The blanching temperature for Apocynum venetum is 120-130℃, and the blanching time is 2-3 minutes; the kneading machine speed is 40-50 r / min, and the kneading time is 15-20 minutes; the drying temperature is 80-90℃, and the drying time is 2-2.5 hours.

6. The jasmine flower scenting process for Apocynum venetum according to claim 1, characterized in that, In step S2, the specific method for the first scenting is as follows: jasmine flowers are mixed with the first-scented Apocynum venetum dried tea at a mass ratio of 1:2.5-1:3, and the mixture is piled up to a thickness of 15-20cm. The mixture is left to stand for scenting at 28-30℃ and a relative humidity of 70%-75% for 10-12 hours, and turned over every 3-4 hours. After the scenting is completed, the Apocynum venetum dried tea is sieved out and placed in a hot air dryer for preliminary drying at a temperature of 60-65℃ for 1-1.5 hours.

7. The jasmine flower scenting process for Apocynum venetum according to claim 1, characterized in that, In step S3, the specific method for the second scenting is as follows: mix fresh jasmine flowers with the first-scented Apocynum venetum tea at a mass ratio of 1:3.5-1:4, pile the mixture to a thickness of 12-15cm, and let it stand for 8-10 hours at 26-28℃ and 65%-70% relative humidity, turning it over every 4-5 hours. After the scenting is completed, sift out the dried Apocynum venetum tea and dry it again at 55-60℃ for 0.8-1 hour.

8. The jasmine flower scenting process for Apocynum venetum according to claim 1, characterized in that, In step S4, the specific method for the third scenting is as follows: Mix fresh jasmine flowers with the second scented Apocynum venetum tea at a mass ratio of 1:4.5-1:5, pile the mixture to a thickness of 10-12cm, and let it stand for scenting for 6-8 hours at 25-26℃ and 60%-65% relative humidity, turning it over every 5-6 hours. After the scenting is completed, sift out the dried Apocynum venetum tea and dry it under vacuum of -0.08-0.09MPa and 50-55℃ for 1.5-2 hours.

9. A compound flower tea, characterized in that, It is prepared by the jasmine flower Apocynum venetum scenting process described in any one of claims 1-8.