Lotus leaf extract for tobacco sheets and preparation method of lotus leaf extract

Abstract

The invention discloses a lotus leaf extract for tobacco sheets and a preparation method of the lotus leaf extract. The preparation method comprises the following steps: (1) extracting a lotus leaf water extract; (2) extracting the lotus leaf supercritical extract; and (3) uniformly mixing the lotus leaf water extract, the lotus leaf supercritical extract, propylene glycol, leaf alcohol, citric acid, malic acid and tea aroma spirane according to a certain mass ratio to obtain the lotus leaf extract. The lotus leaf extract disclosed by the invention is obvious in lotus leaf characteristic fragrance and relatively high in product quality, the preparation method is practical and feasible, and the effect is relatively good when the lotus leaf extract is applied to tobacco slices.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco flavor extraction, and in particular to a lotus leaf extract for slices and a preparation method thereof. Background Art

[0002] The smell of lotus leaves has a delicate and elegant fragrance, which is light, fresh, fragrant and refreshing. When making special tobacco slices, slices with obvious lotus fragrance are very popular in the market, and the source of the lotus fragrance mainly comes from lotus leaf extract.

[0003] The current preparation process for lotus leaf extract primarily relies on solvent extraction. This process involves vacuum concentration through rotary evaporation, which results in a loss of top notes. The resulting finished product has a weak, less pronounced lotus aroma, leading to a high degree of product homogeneity. Adding it to tobacco sheets also contributes little to the lotus flavor. Therefore, a method for preparing lotus leaf extract that effectively enhances its characteristic lotus flavor is urgently needed to meet the demand for high-aroma, high-quality lotus leaf extract for tobacco sheet production. Summary of the Invention

[0004] Based on the above deficiencies in the prior art, the present invention proposes a lotus leaf extract for tobacco sheets and a preparation method thereof. By preparing a lotus leaf water extract and performing aroma compensation on the lotus leaf water extract, a lotus leaf extract with a distinct lotus aroma and flavor is obtained. The product quality is high, the method is practical and easy to implement, and the applicability is strong.

[0005] In order to solve the above technical problems, the present invention provides a method for preparing a lotus leaf extract for tobacco slices, comprising the following steps:

[0006] (1) Extraction of lotus leaf water extract;

[0007] (2) Extraction of lotus leaf supercritical extract;

[0008] (3) The lotus leaf water extract, the lotus leaf supercritical extract, propylene glycol, leaf alcohol, citric acid, malic acid, and tea aroma spirane are uniformly mixed to obtain the lotus leaf extract for tobacco slices.

[0009] As a preferred embodiment of the above technical solution, the method for preparing the lotus leaf extract for tobacco sheets provided by the present invention further includes some or all of the following technical features:

[0010] As an improvement of the above technical solution, the extraction process of the lotus leaf water extract in step (1) is as follows: preparing lotus leaves, reflux extraction using purified water as solvent, filtering, concentrating, re-filtering, and re-concentrating to obtain the lotus leaf water extract.

[0011] As an improvement of the above technical solution, the mass ratio of the lotus leaf to the pure water is 1:8-10; the filtration and refiltration are performed by a ceramic membrane filtration with a pore size of 0.8 μm.

[0012] As an improvement of the above technical solution, the relative density after concentration is 1.05-1.08; the relative density after further concentration is 1.20-1.25.

[0013] As an improvement of the above technical solution, the extraction process of the lotus leaf supercritical extract in step (2) is lotus leaf preparation, extraction, addition of entrainer, and separation to obtain the lotus leaf supercritical extract.

[0014] As an improvement of the above technical solution, the extraction solvent is CO2, the extraction pressure is 15-20 MPa; the entrainer is anhydrous ethanol; and the separation pressure is 3-5 MPa.

[0015] As an improvement of the above technical solution, the extraction temperature is 40-45°C, the separation temperature is 45-50°C, and the extraction time is 1-2h.

[0016] As an improvement of the above technical solution, in step (3), the lotus leaf water extract is 80-90 parts, the lotus leaf supercritical extract is 5-10 parts, propylene glycol is 3-8 parts, leaf alcohol is 0.5-1 part, citric acid is 0.5-1 part, malic acid is 0.5-1 part, and tea-flavored spirane is 0.5-1 part.

[0017] The present invention also provides a lotus leaf extract for tobacco slices, which is prepared by any of the above methods. The lotus leaf extract for tobacco slices contains 80-90 parts of lotus leaf water extract, 5-10 parts of lotus leaf supercritical extract, 3-8 parts of propylene glycol, 0.5-1 part of leaf alcohol, 0.5-1 part of citric acid, 0.5-1 part of malic acid, and 0.5-1 part of tea-aromatic spirulane.

[0018] The present invention also provides a use of any of the above lotus leaf extracts for tobacco slices, wherein the lotus leaf extracts for tobacco slices are used to add lotus fragrance to tobacco slices.

[0019] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0020] The lotus leaf extract for tobacco slices of the present invention is successfully prepared by first preparing a lotus leaf water extract and a lotus leaf supercritical extract, and then performing flavor compensation. The preparation method is feasible, can effectively solve the deficiency of the lotus leaf extract in having a low lotus fragrance, has strong practicality, and is simple and easy to use.

[0021] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following is a detailed description in conjunction with the preferred embodiments. DETAILED DESCRIPTION

[0022] The specific embodiments of the present invention are described in detail below. As a part of this specification, the embodiments illustrate the principles of the present invention through examples. Other aspects, features and advantages of the present invention will become clear through the detailed description.

[0023] Example 1:

[0024] (1) Weigh 400 g of dry green lotus leaf block material and place the lotus leaf block in a 5000 mL round-bottom flask;

[0025] (2) After adding 3500 g of purified water into the round-bottom flask, heat it with an electric heating mantle at 100°C. After 40 minutes, the liquid droplets begin to reflux;

[0026] (3) After cooling, the extract was filtered through a ceramic membrane with a pore size of 0.8 μm and concentrated by rotary evaporation under negative pressure until the extract had a relative density of 1.04.

[0027] (4) The concentrated extract was filtered through a ceramic membrane with a pore size of 0.8 μm, and then concentrated by rotary evaporation under negative pressure. The extract was concentrated to a relative density of 1.21 to obtain a lotus leaf water extract.

[0028] (5) Weigh 200 g of withered lotus leaf pieces and place them in the extraction kettle of a supercritical CO2 extractor at an extraction pressure of 18 MPa. Add 50 ml of anhydrous ethanol as an entrainer at a separation pressure of 3.2 MPa. The extraction temperature is 40 ° C, the separation temperature is 45 ° C, and the extraction time is 1 h to obtain a lotus leaf supercritical extract with a strong lotus fragrance.

[0029] (6) 85 parts of lotus leaf water extract, 6 parts of lotus leaf supercritical extract, 6.5 parts of propylene glycol, 0.5 parts of leaf alcohol, 1 part of citric acid, 1 part of malic acid, and 1 part of tea aroma spirane were fully mixed to obtain lotus leaf extract.

[0030] Example 2:

[0031] (1) Weigh 500 g of dry green lotus leaf blocks and place them in a 5000 mL round-bottom flask;

[0032] (2) After adding 4000 g of purified water into the round-bottom flask, the flask was heated at 100 °C with an electric heating mantle. After 45 min, the droplets began to reflux and extract;

[0033] (3) After cooling, the extract was filtered through a ceramic membrane with a pore size of 0.8 μm and concentrated by rotary evaporation under negative pressure until the extract had a relative density of 1.06.

[0034] (4) The concentrated extract was filtered through a ceramic membrane with a pore size of 0.8 μm, and then concentrated by negative pressure rotary evaporation. The extract was concentrated to a relative density of 1.22 to obtain a lotus leaf water extract.

[0035] (5) Weigh 240 g of dry green lotus leaf powder and place it in the extraction kettle of a supercritical CO2 extractor with an extraction pressure of 20 MPa. Add 55 ml of anhydrous ethanol as an entrainer and a separation pressure of 3.4 MPa. The extraction temperature is 42 ° C, the separation temperature is 47 ° C, and the extraction time is 2 h to obtain a lotus leaf supercritical extract with a strong lotus fragrance.

[0036] (6) 87 parts of lotus leaf water extract, 5 parts of lotus leaf supercritical extract, 5 parts of propylene glycol, 0.5 parts of leaf alcohol, 1 part of citric acid, 0.5 parts of malic acid, and 1 part of tea aroma spirane were fully mixed to obtain lotus leaf extract.

[0037] Example 3:

[0038] (1) Weigh 500 g of dry green lotus leaf blocks and place them in a 5000 mL round-bottom flask;

[0039] (2) After adding 4000 g of purified water into the round-bottom flask, the flask was heated at 100 °C with an electric heating mantle. After 45 min, the droplets began to reflux and extract;

[0040] (3) After cooling, the extract was filtered through a ceramic membrane with a pore size of 0.8 μm and concentrated by negative pressure rotary evaporation to a relative density of 1.08.

[0041] (4) The concentrated extract was filtered through a ceramic membrane with a pore size of 0.8 μm, and then concentrated by negative pressure rotary evaporation. The extract was concentrated to a relative density of 1.23 to obtain a lotus leaf water extract.

[0042] (5) Weigh 250 g of dry green lotus leaf powder and place it in the extraction kettle of a supercritical CO2 extractor. The extraction pressure is 20 MPa. Add 60 ml of anhydrous ethanol as an entrainer. The separation pressure is 3.5 MPa. The extraction temperature is 41 ° C, the separation temperature is 46 ° C, and the extraction time is 1.5 h to obtain a lotus leaf supercritical extract with a strong lotus fragrance.

[0043] (6) 86 parts of lotus leaf water extract, 6 parts of lotus leaf supercritical extract, 5.5 parts of propylene glycol, 0.5 parts of leaf alcohol, 0.5 parts of citric acid, 0.5 parts of malic acid, and 1 part of tea aroma helicane were fully mixed to obtain lotus leaf extract.

[0044] When the lotus leaf extract prepared by the present invention is added to tobacco sheets during sheet production, the sheet product exhibits a more pronounced lotus aroma, effectively improving the quality of the sheet product. Sensory evaluation of tobacco smoke using the lotus leaf extract of the present invention showed an improvement of 1-2 points in the olfactory aroma evaluation out of 5 points, and an improvement of 1-2 points in the smoke aroma richness evaluation out of 5 points.

[0045] The raw materials listed in the present invention, as well as the upper and lower limits and interval values ​​of the raw materials, and the upper and lower limits and interval values ​​of the process parameters (such as temperature, time, etc.) can all realize the present invention, and the embodiments are not listed one by one here.

[0046] The above description is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and changes can be made without departing from the principles of the present invention. These improvements and changes are also considered to be within the scope of protection of the present invention.

Claims

1. A method for preparing a lotus leaf extract for tobacco sheets, characterized in that: The following steps are included: (1) Extraction of lotus leaf water extract; (2) Extraction of lotus leaf supercritical extract; (3) The lotus leaf water extract, the lotus leaf supercritical extract, propylene glycol, leaf alcohol, citric acid, malic acid, and tea aroma spirane are uniformly mixed to obtain the lotus leaf extract for tobacco slices.

2. The method for preparing the lotus leaf extract for tobacco sheets according to claim 1, wherein: The extraction process of the lotus leaf water extract in step (1) comprises the following steps: preparing lotus leaves, performing reflux extraction using purified water as a solvent, filtering, concentrating, re-filtering, and re-concentrating to obtain the lotus leaf water extract.

3. The method for preparing the lotus leaf extract for tobacco sheets according to claim 2, wherein: The mass ratio of the lotus leaf to the pure water is 1:8-10; the filtration and refiltration are performed by using a ceramic membrane with a pore size of 0.8 μm.

4. The method for preparing the lotus leaf extract for tobacco sheets according to claim 2 or 3, wherein: The relative density after concentration is 1.05-1.08; the relative density after further concentration is 1.20-1.

25.

5. The method for preparing the lotus leaf extract for tobacco sheets according to claim 1, wherein: The extraction process of the lotus leaf supercritical extract in step (2) comprises lotus leaf preparation, extraction, adding an entrainer, and separation, thereby obtaining the lotus leaf supercritical extract.

6. The method for preparing the lotus leaf extract for tobacco sheets according to claim 5, wherein: The extraction solvent is CO2, the extraction pressure is 15-20 MPa; the entrainer is anhydrous ethanol; and the separation pressure is 3-5 MPa.

7. The method for preparing the lotus leaf extract for tobacco sheets according to claim 5, wherein: The extraction temperature is 40-45° C., the separation temperature is 45-50° C., and the extraction time is 1-2 hours.

8. The method for preparing the lotus leaf extract for tobacco sheets according to claim 1, wherein: In the step (3), the lotus leaf water extract is 80-90 parts, the lotus leaf supercritical extract is 5-10 parts, propylene glycol is 3-8 parts, leaf alcohol is 0.5-1 part, citric acid is 0.5-1 part, malic acid is 0.5-1 part, and tea-scented spirane is 0.5-1 part.

9. A lotus leaf extract for tobacco slices, characterized by: The lotus leaf extract for tobacco slices is prepared by the method of any one of claims 1 to 8, and contains 80-90 parts of lotus leaf water extract, 5-10 parts of lotus leaf supercritical extract, 3-8 parts of propylene glycol, 0.5-1 part of leaf alcohol, 0.5-1 part of citric acid, 0.5-1 part of malic acid, and 0.5-1 part of tea-aroma helicone.

10. A use of the lotus leaf extract for tobacco sheets according to any one of claims 1 to 9, characterized in that: The lotus leaf extract for tobacco slices is used for adding lotus fragrance to tobacco slices.