Day lily de-enzyming agent, day lily de-enzyming method and day lily product manufacturing method

Abstract

The daylily fixation agent comprises sodium pyrosulfite, malic acid and soluble benzoate, the mass ratio of the sodium pyrosulfite to the malic acid is 1: (1-10); the mass ratio of the sodium pyrosulfite to the soluble benzoate is 1: (0.1-10). The invention also comprises a daylily de-enzyming method and a daylily product manufacturing method. The daylily fixation agent has the characteristic of high utilization rate of sodium pyrosulfite, can effectively reduce the use amount of sodium pyrosulfite, and reduces the residue of sodium pyrosulfite in the product, so that a healthier daylily product is obtained; the day lily treated by the enzyme deactivation agent disclosed by the invention is free from spoilage, yellow in color and appropriate in mouth feel; the amount of wastewater generated by desulfurization can be reduced, the production cost is saved, and the environmental pollution is reduced; the method is green, environment-friendly and low in cost.

Description

Technical Field

[0001] This invention relates to the field of vegetable processing, specifically to blanching agents, blanching methods, and methods for producing daylily products. Background Technology

[0002] daylily ( Hemerocalliscitrina Daylily (Hemerocallis fulva) is the flower bud of a plant belonging to the genus Hemerocallis in the family Asphodelaceae, and is a popular vegetable. Currently, there are four main countries in the world that commercially produce daylilies: China, Malaysia, Madagascar, and Japan. my country is the world's largest producer, processor, and consumer of daylilies. Qidong in Hunan, Datong in Shanxi, Dali in Shaanxi, and Qingyang in Gansu are the main production areas of daylilies in my country. Fresh daylilies are prone to browning, flowering, and rotting if not preserved promptly after harvesting (within 4 hours of picking), resulting in significant economic losses for daylily growers. This is especially true in southern my country, where daylily harvesting is concentrated between May and July, which coincides with the rainy season, posing a significant challenge to daylily preservation. Therefore, many regions in my country use sodium metabisulfite to preserve and blanch fresh daylilies. Currently, the amount of sodium metabisulfite added is generally 1-10% (based on the quality of fresh daylilies). However, adding too much sodium metabisulfite can easily lead to excessive residues, thereby endangering people's health. Secondly, the addition of large amounts of sodium metabisulfite can cause environmental pollution, polluting the air and groundwater, and seriously affecting the living environment of residents. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide a daylily blanching agent that can be used to preserve daylilies with low doses of sodium metabisulfite, a daylily blanching method, and a daylily product preparation method.

[0004] The technical solution adopted by the present invention to solve its technical problem is as follows: a daylily blanching agent, comprising sodium metabisulfite, malic acid and soluble benzoate; The mass ratio of sodium metabisulfite to malic acid is 1:1~10; The mass ratio of sodium metabisulfite to soluble benzoate is 1:0.1~10.

[0005] Preferably, the soluble benzoate includes potassium benzoate and / or sodium benzoate.

[0006] Preferably, the ratio of sodium metabisulfite to daylily raw material is 2~10:1000.

[0007] Based on the same inventive concept, the present invention also provides a method for blanching daylily, wherein the blanching agent is taken, water is added or not added, and the mixture is evenly mixed on the surface of the daylily raw material, and sealed and stored at 4℃~15℃ for 1~15 days to obtain blanched daylily. Based on mass calculations, the ratio between the raw daylily and the sodium metabisulfite, malic acid, and soluble benzoate in the daylily blanching agent is 1000:2~10:10~20:10~15; The ratio of daylily raw material to water is as follows: mass ratio is 100:0~50.

[0008] Preferably, the daylily raw material is fresh daylily.

[0009] Based on the same inventive concept, the present invention also provides a method for producing daylily products, which involves taking blanched daylilies prepared with the daylily blanching agent or blanched daylilies obtained by the daylily blanching method, soaking and / or rinsing to desulfurize them, and obtaining desulfurized daylilies.

[0010] Preferably, sodium bicarbonate is used to assist in desulfurization during soaking and / or rinsing.

[0011] Preferably, the sodium bicarbonate used in the desulfurization process is in the form of a sodium bicarbonate solution with a concentration of 0.1wt% to 2wt%.

[0012] Preferably, the blanched daylily is soaked in a sodium bicarbonate solution, and then soaked and / or rinsed with water.

[0013] Preferably, the total soaking time of blanched daylily in sodium bicarbonate solution is 0.5 to 4 hours.

[0014] Preferably, the amount of sodium bicarbonate solution used is 0.5 to 5 times the mass of the daylily raw material.

[0015] Preferably, the desulfurized daylily is preserved in brine to obtain salted daylily; the sodium chloride content in the brine is 5wt%~20wt%.

[0016] Preferably, the brine used in the salting process contains: 5wt%~20wt% sodium chloride, 0.1wt%~1wt% soluble benzoate, 0.1wt%~0.5wt% ascorbic acid, and 0.01wt%~0.05wt% gardenia yellow.

[0017] The present invention has the following beneficial effects: (1) The daylily blanching agent of the present invention has the characteristic of high utilization rate of sodium metabisulfite, which can effectively reduce the amount of sodium metabisulfite used and reduce the residue of sodium metabisulfite in the product, thereby obtaining a healthier daylily product; the daylily treated with the blanching agent of the present invention is free from spoilage, yellow in color, and has a suitable taste. (2) Reducing the amount of sodium metabisulfite can also reduce the amount of wastewater generated by desulfurization, save production costs, and reduce environmental pollution; the present invention has the advantages of being green, environmentally friendly and inexpensive.

[0018] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a picture of daylily products after blanching in the blank group during an experiment on the effect of blanching agents; Figure 2 This is a picture of daylily products after blanching in the control group during an experiment on the effectiveness of blanching agents. Figure 3 This is a picture of daylily products after blanching in test group 1 during an experiment on the effect of blanching agents. Figure 4 This is a picture of daylily products after blanching in experimental group 4 during the experiment on the effect of blanching agent; Figure 5 This is a picture of daylily products after blanching in experimental group 10 during an experiment on the effect of blanching agents. Figure 6 This is a statistical chart showing the amount of sodium metabisulfite added, wastewater generation, and cost of Example 1 of the present invention compared to the traditional process. Figure 7 This is a picture of the daylily product obtained by replacing malic acid in the daylily blanching agent with citric acid in Comparative Example 2. Detailed Implementation

[0020] To make the objectives, solutions, and beneficial technologies of this invention clearer, the invention will be further described in detail below with reference to embodiments and accompanying drawings. It should be noted that the embodiments described in this specification are merely illustrative of the invention and are not intended to limit the invention.

[0021] For simplicity, this paper only explicitly discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form an undefined range; and any lower limit can be combined with other lower limits to form an undefined range, just as any upper limit can be combined with any other upper limit to form an undefined range. Furthermore, although not explicitly stated, every point or individual value between the endpoints of a range is included within that range. Therefore, each point or individual value can serve as its own lower or upper limit and be combined with any other point or individual value, or with other lower or upper limits, to form an undefined range.

[0022] In this description, it should be noted that, unless otherwise stated, "above" and "below" include the stated number, "multiple" in "one or more" means two or more, and "more than" in "one or more" means two or more.

[0023] An embodiment of the present invention provides a daylily blanching agent, comprising sodium metabisulfite, malic acid and soluble benzoate; The mass ratio of sodium metabisulfite to malic acid is 1:1~10; The mass ratio of sodium metabisulfite to soluble benzoate is 1:0.1~10.

[0024] The working principle of sodium metabisulfite is as follows: after sodium metabisulfite is mixed with daylily, it slowly releases sulfur dioxide to blanch and preserve the fresh daylily. However, in traditional processes, most of the sodium metabisulfite is not hydrolyzed, resulting in low utilization. In order to generate enough sulfur dioxide to blanch and preserve the daylily, a large amount of sodium metabisulfite needs to be added, which leads to a large amount of sodium metabisulfite remaining in the daylily.

[0025] This invention provides a novel combined blanching agent that mixes sodium metabisulfite, malic acid, and soluble benzoate in a specific ratio. This effectively promotes the hydrolysis of sodium metabisulfite, requiring only a very small amount to release sufficient sulfur dioxide for blanching and preservation. Therefore, it significantly reduces the amount of sodium metabisulfite needed and minimizes sodium metabisulfite residue in daylily products. The soluble benzoate primarily serves as an auxiliary preservative in this formulation.

[0026] The malic acid in the blanching agent of this invention promotes the decomposition of sodium metabisulfite. The chemical reaction principle is as follows: .

[0027] The ratio of sodium metabisulfite to malic acid affects the decomposition of sodium metabisulfite. If the amount of malic acid is too low, the decomposition rate of sodium metabisulfite will be too low, and it will not be able to decompose in time. More sodium metabisulfite will still be needed to achieve sufficient preservation, and the residual sodium metabisulfite will increase. If the amount of malic acid is too high, it will cause the sodium metabisulfite to decompose too quickly and the storage environment will not be mild enough for daylilies, resulting in poor appearance of daylily products.

[0028] The color of daylily products has a significant impact on their sales. Consumers prefer yellow daylilies and find those that are too dark (yellowish-brown or golden-yellow) or too light (pale yellow or white) unacceptable. Fresh daylilies are prone to browning if not preserved promptly after harvesting. Existing techniques include salting daylilies, which prevents rotting but also causes browning, resulting in dark brown daylilies that are unsellable. Current preservation technologies struggle to maintain stable daylily color. The daylily blanching agent of this invention avoids the large-scale use of sodium metabiphosphite, provides excellent preservation, and has a mild formula, resulting in daylily products with an appealing color and high quality.

[0029] In some embodiments of the present invention, the mass ratio of sodium metabisulfite to soluble benzoate is 1:1 to 8.

[0030] In some embodiments of the present invention, the ratio of sodium metabisulfite, malic acid, and soluble benzoate by mass is 2~10:10~20:10~15.

[0031] In embodiments of the present invention, the soluble benzoate includes potassium benzoate and / or sodium benzoate.

[0032] In embodiments of the present invention, the dosage relationship with daylily raw materials is as follows: the mass ratio of sodium metabisulfite to daylily raw materials is 2~10:1000. Within this range, the blanching agent has a good treatment effect on daylilies.

[0033] The daylily blanching method of this invention involves taking the daylily blanching agent, adding water or not, mixing it evenly on the surface of the daylily raw material, and sealing and storing it at 4℃~15℃ for 1~15 days to obtain blanched daylily. Based on mass calculations, the ratio between the raw daylily and the sodium metabisulfite, malic acid, and soluble benzoate in the daylily blanching agent is 1000:2~10:10~20:10~15; The ratio of daylily raw material to water is as follows: mass ratio is 100:0~50.

[0034] In some embodiments of the invention, water is sprayed onto the surface of the daylily raw material beforehand. Pre-spraying water helps with mixing.

[0035] In some embodiments of the present invention, water and a blanching agent are mixed to form a solution, which is then sprayed onto the surface of the daylily raw material. This promotes mixing.

[0036] In an embodiment of the present invention, the daylily raw material is fresh daylily.

[0037] In some embodiments of the present invention, the daylily raw material is daylily harvested within 4 hours.

[0038] In some embodiments of the present invention, the daylily raw material is daylily that has been harvested within 4 hours and then preserved; common preservation measures include: refrigeration at 4°C.

[0039] The method for producing daylily products according to this invention involves taking blanched daylilies prepared with the daylily blanching agent or blanched daylilies obtained by the daylily blanching method, soaking and / or rinsing them to remove sulfur, and obtaining desulfurized daylilies.

[0040] In embodiments of the present invention, sodium bicarbonate is used to assist in desulfurization during soaking and / or rinsing. Sodium bicarbonate can react with sulfur dioxide in daylilies to produce sodium sulfite or sodium bisulfite; sodium sulfite or sodium bisulfite is highly water-soluble and easily dissolves in aqueous solutions; this method can more efficiently remove residual sulfur dioxide from daylilies, reduce the amount of aqueous solution used, and this method does not damage the quality of daylily products; it can more efficiently remove residual sulfur dioxide from daylily products, reduce its harmful effects on the human body, and further reduce the amount of wastewater generated, thus reducing production costs.

[0041] In an embodiment of the present invention, the sodium bicarbonate used in the desulfurization process is in the form of a sodium bicarbonate solution with a concentration of 0.1wt% to 2wt%.

[0042] In an embodiment of the present invention, blanched daylily is soaked in sodium bicarbonate solution, and then soaked and / or rinsed with water.

[0043] In an embodiment of the present invention, the total soaking time of blanched daylily in sodium bicarbonate solution is 0.5 to 4 hours.

[0044] In some embodiments of the present invention, the total soaking and / or rinsing time during the desulfurization process is 8 to 36 hours.

[0045] In an embodiment of the present invention, the amount of sodium bicarbonate solution used is 0.5 to 5 times the mass of the daylily raw material.

[0046] In some embodiments of the present invention, when soaking daylily buds in water to blanch them, the total amount of water used is 2 to 20 times the mass of the daylily buds.

[0047] In an embodiment of the present invention, desulfurized daylily is preserved in brine to obtain salted daylily; the sodium chloride content in the brine is 5wt%~20wt%.

[0048] Traditional daylily products are mainly sold as dried daylily buds, resulting in low added value and difficulty in increasing profits. However, in recent years, the emergence of salted daylily buds has boosted the daylily market, with the purchase price of fresh daylily buds rising from 2.5 yuan / jin to 4 yuan / jin. Salted daylily buds are primarily used in cold dishes, hot pot, and barbecues, increasing product added value and sales volume, while dried daylily buds cannot be used in these consumption scenarios. However, salted daylily buds are more difficult to produce than traditional dried daylily buds. To achieve sufficient preservation, the amount of sodium metabisulfite added generally needs to reach 6-10% (based on the quality of fresh daylily buds), and consumers have also placed higher demands on the quality of salted daylily buds. This invention, through the aforementioned technical means, produces salted daylily buds that are yellow in color, have a suitable taste, and a long shelf life, with sodium metabisulfite residue levels lower than the national standard GB 2760-2024, meeting market demands and significantly improving the economic benefits of daylily products.

[0049] In embodiments of the present invention, the brine used in the salting process contains: 5wt%~20wt% sodium chloride, 0.1wt%~1wt% soluble benzoate, 0.1wt%~0.5wt% ascorbic acid, and 0.01wt%~0.05wt% gardenia yellow. Through the above technical means, the resulting salted daylily has a longer shelf life, achieving no spoilage or deterioration within one year. In some embodiments of the present invention, the amount of brine used in the salting process is 0.5 to 8 times the mass of the daylily raw material.

[0050] In some embodiments of the present invention, the soluble benzoate in the brine includes potassium benzoate and / or sodium benzoate.

[0051] Example The following examples describe the disclosure of this invention in more detail. These examples are merely illustrative, as various modifications and variations will be apparent to those skilled in the art within the scope of this disclosure. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are based on weight. Unless otherwise stated, all reagents used in the examples are available commercially or synthesized using conventional methods and are ready for use without further processing. Unless otherwise stated, all instruments used in the examples are available commercially.

[0052] The reagents used in each embodiment, such as sodium metabisulfite, malic acid, potassium benzoate, sodium bicarbonate, hydrochloric acid, hydrogen peroxide, and sodium hydroxide standard solution, were purchased from Shanghai Yuanye Biotechnology Co., Ltd.; the fresh daylilies were from Qidong, Hunan, and the variety was Chonglihua.

[0053] The instruments used in each embodiment were as follows: analytical balance (Mettler-Toledo Instruments Ltd.); rotary evaporator (Shanghai Yarong Biochemical Instrument Factory); and distillation apparatus for determining sodium metabisulfite residue (calculated as sulfur dioxide) by acid-base titration.

[0054] Experiments on the effects of different formulations of blanching agents Experimental Procedure: Fresh daylily buds, sodium metabisulfite, malic acid, and potassium benzoate were mixed in different proportions, thoroughly combined, and then sealed and stored at 10℃ for 7 days. After 7 days, the daylily buds were evaluated based on their color, spoilage rate, residual sodium metabisulfite (calculated as sulfur dioxide), and taste. The desulfurization method used was to soak the daylily buds in clean water four times, for a total of 12 hours. The blanching agent formulation and experimental results are shown in Table 1.

[0055] Table 1. Experimental results of the effects of different formulations of blanching agents.

[0056] Experimental results: (1) The blank group did not use blanching agent, and the daylilies after 7 days looked like Figure 1 As shown, the top of the daylily turns brown, it is completely rotten, white mold appears, and it smells rotten. (2) The control group used the traditional formula, with sodium metabisulfite at 10 wt% of fresh daylily, without malic acid and potassium benzoate. The daylilies after 7 days looked like Figure 2 As shown, the daylilies were yellow and showed no signs of spoilage; however, after desulfurization, the residual sodium metabisulfite content reached 1746 mg / kg, which seriously exceeded the standard. (3) According to the mass calculation, experimental groups 1 and 2 used a formula with the ratio of fresh daylily, sodium metabisulfite, malic acid, and potassium benzoate of 1000:0.1~1.9:5~15:10~15; the appearance of experimental group 1 was as follows: Figure 3 As shown, the daylily is yellowish-brown, with the end darkening in color, indicating some spoilage. The residual amount of sodium metabisulfite in test groups 1 and 2 was 23.6 or 11.4 mg / kg, respectively. Although the residual amount of sodium metabisulfite meets the national standard (GB 2760-2024), the yellowish-brown color of the daylily is not conducive to market sales. (4) According to the mass calculation, experimental groups 3 and 4 used a formula with a ratio of fresh daylily, sodium metabisulfite, malic acid, and potassium benzoate of 1000:2~10:10~20:10~15; the appearance of experimental group 4 was as follows: Figure 4 As shown, the daylily was yellow, showed no signs of spoilage, had a crisp texture, and no obvious sour taste or other off-flavors. The residual amount of sodium metabisulfite in test groups 3 and 4 was 55.1 or 43.7 mg / kg, which is lower than the national standard of 100 mg / kg (GB 2760-2024). (5) Experimental groups 5-12 had a higher amount of sodium metabisulfite, and the appearance of experimental group 10 was as follows: Figure 5 As shown, the daylilies are golden yellow and show no signs of spoilage. However, with the increase in sodium metabisulfite usage, the malic acid content is insufficient for its full decomposition, resulting in sodium metabisulfite residues exceeding national standards. For the slight increase in sodium metabisulfite usage, improving the desulfurization process can be considered to bring the product up to standard.

[0057] Experimental conclusion: According to quality calculations, when the ratio of fresh daylily, sodium metabisulfite, malic acid, and potassium benzoate is 1000:2~10:10~20:10~15, the daylily has a suitable color, no spoilage occurs, and the residual amount of sodium metabisulfite meets the national standard, making it suitable for use in the blanching and preservation process of daylily.

[0058] Example 1 The daylily blanching agent in this embodiment includes: sodium metabisulfite, malic acid, and potassium benzoate. The dosage relationship with the daylily raw material is: 50kg fresh daylilies (within 4 hours of harvest), 100g sodium metabisulfite, 600g malic acid, and 500g potassium benzoate (mass ratio of 1000:2:12:10).

[0059] The blanching method for daylilies in this embodiment is as follows: Fresh daylilies are placed in a sealed bag, and the blanching agent is evenly mixed on the surface of the fresh daylilies. The bag is then sealed and stored at 8℃~12℃ for 5 days to obtain blanched daylilies. After blanching, the daylilies turn from green to yellow.

[0060] The obtained blanched daylily buds were desulfurized by soaking and rinsing: they were soaked in a 0.1 wt% sodium bicarbonate solution (100 kg) for 30 minutes; then soaked in clean water three times for a total of 12 hours, using a total of 500 kg of water; thus, desulfurized daylily buds were obtained. The obtained desulfurized daylily buds showed no signs of spoilage, had a golden color, and a suitable taste.

[0061] Desulfurized daylily was preserved in 100 kg of brine to obtain salted daylily; the brine contained: 5 wt% sodium chloride, 0.5 wt% potassium benzoate, 0.5 wt% ascorbic acid, and 0.03 wt% gardenia yellow.

[0062] The sodium metabisulfite residue in the daylily products tested according to the national standard GB 2760-2024 was lower than the national standard by 0.1 g / kg, indicating that the salted daylilies meet market demand.

[0063] like Figure 6 As shown, calculations show that compared with traditional processes, the amount of sodium metabisulfite added in this embodiment of the invention is reduced by more than 95%, the residual amount of sodium metabisulfite in daylilies meets national standards, the amount of wastewater generated is reduced by more than 50%, and the cost is saved by more than 60%. This invention has the advantages of being green, environmentally friendly, and inexpensive, ensuring the safety of daylily products for consumption and greatly reducing the emission of wastewater and waste gas during the production process.

[0064] Example 2 The daylily blanching agent in this embodiment includes: sodium metabisulfite, malic acid, and potassium benzoate. The dosage relationship with the daylily raw material is: 50kg fresh daylilies (within 4 hours of harvest), 400g sodium metabisulfite, 600g malic acid, and 500g potassium benzoate (mass ratio of 1000:8:12:10).

[0065] The blanching method for daylily in this embodiment is as follows: Fresh daylily is placed in a sealed bag, and 100g of sodium metabisulfite, 600g of malic acid and 500g of potassium benzoate are dissolved in 5L of water. The resulting aqueous solution is sprayed evenly onto the surface of the fresh daylily and sealed and stored at 4℃~11℃ for 8 days to obtain blanched daylily. After blanching, the daylily turns from green to yellow.

[0066] The obtained blanched daylily was desulfurized by soaking and rinsing: it was soaked in a 0.5wt% sodium bicarbonate solution (50kg) for 30 minutes; then it was soaked in clean water 3 times for a total of 24 hours, using a total of 500kg of water; thus, desulfurized daylily was obtained.

[0067] Desulfurized daylily was preserved in 100 kg of brine to obtain salted daylily; the brine contained: 10 wt% sodium chloride, 0.5 wt% potassium benzoate, 0.5 wt% ascorbic acid, and 0.05 wt% gardenia yellow.

[0068] According to the national standard GB 2760-2024, the residual sodium metabisulfite in the desulfurized daylily was found to be 0.1 g / kg lower than the national standard. The resulting daylily product showed no signs of spoilage, had a golden color, and a suitable taste, making it a salted daylily product that meets market demand.

[0069] Example 3 The daylily blanching agent in this embodiment includes: sodium metabisulfite, malic acid, and potassium benzoate. The dosage relationship with the daylily raw material is: 1000 kg fresh daylilies (within 4 hours of harvest), 3 kg sodium metabisulfite, 10 kg malic acid, and 1 kg potassium benzoate (mass ratio of 1000:3:10:1).

[0070] The blanching method for daylilies in this embodiment is as follows: Fresh daylilies are placed in a sealable large container, and the blanching agent is evenly mixed on the surface of the fresh daylilies. The container is then sealed and stored at 10℃~15℃ for 10 days to obtain blanched daylilies. After blanching, the daylilies turn from green to yellow.

[0071] The obtained blanched daylily was desulfurized by soaking and rinsing: it was soaked in 0.1wt% sodium bicarbonate solution (500kg) for 30 minutes; then it was soaked in clean water 3 times for a total of 12 hours, using a total of 5000kg of water; thus, desulfurized daylily was obtained.

[0072] Desulfurized daylily buds were preserved in 2000 kg of brine to obtain salted daylily buds. The brine contained 5 wt% sodium chloride, 0.5 wt% potassium benzoate, 0.5 wt% ascorbic acid, and 0.03 wt% gardenia yellow. The resulting salted daylily buds were packaged in 500g / bag, 2kg / bag, 5kg / bag, and 10kg / bag for market sale.

[0073] According to the national standard GB 2760-2024, the residual sodium metabisulfite in the desulfurized daylily was found to be 0.1 g / kg lower than the national standard. The resulting daylily product showed no signs of spoilage, had a golden color, and a suitable taste, making it a salted daylily product that meets market demand.

[0074] Comparative Example 1 This comparative example uses sodium metabisulfite as a blanching agent for daylilies; the dosage relationship with the daylily raw material is: 50 kg of fresh daylilies (within 4 hours of harvest) corresponds to 2 kg of sodium metabisulfite (mass ratio of 1000:40).

[0075] The blanching method for daylilies in this comparative example is as follows: Fresh daylilies are placed in a sealed bag, and the blanching agent is evenly mixed on the surface of the fresh daylilies. The bag is then sealed and stored at 10℃~15℃ for 7 days to obtain blanched daylilies. After blanching, the daylilies turn from green to yellow, but the color of the ends darkens, indicating some spoilage.

[0076] The blanched daylily buds were desulfurized through soaking and rinsing: they were soaked in clean water four times for a total of 12 hours, using a total of 1000 kg of water; thus, desulfurized daylily buds were obtained. According to the national standard GB 2760-2024, the residual amount of sodium metabisulfite in the desulfurized daylily buds was 492.6 mg / kg, which exceeded the standard.

[0077] According to conventional production methods, desulfurized daylily is preserved in 100kg of brine to produce salted daylily. The brine contains 5wt% sodium chloride, 0.4wt% potassium benzoate, 0.1wt% sodium metabisulfite, and 0.2wt% vitamin B. Sodium metabisulfite is also added to the brine, resulting in the salted daylily product having an excessive sodium metabisulfite content.

[0078] Compared to Example 1, this comparative example uses a higher amount of sodium metabisulfite, but the blanched daylily still showed some spoilage, and the residual amount of sodium metabisulfite after desulfurization was too high. This is because the sodium metabisulfite was not fully decomposed, resulting in neither sufficient preservation effect nor residue.

[0079] Compared to Example 1, this comparative example uses a large amount of clean water to desulfurize blanched daylily, yet the sodium metabisulfite content of the product still exceeds the standard; it can be seen that the solution of the present invention can reduce the generation of desulfurization wastewater compared to the prior art.

[0080] Comparative Example 2 Malic acid and citric acid are both common food additives. In this comparative example, malic acid was replaced with citric acid in Example 1. Apart from this, the other components of the daylily blanching agent and the daylily processing method in this comparative example are the same as in Example 1.

[0081] The appearance of the salted daylily product obtained in this comparative example is as follows: Figure 7 As shown in Example 1, when malic acid was replaced with citric acid, the resulting daylily product lost its original color, appearing white or pale yellow. This indicates that the daylily was over-bleached and is unpopular with consumers. The reason for this may be that malic acid has a milder oxidizing effect compared to citric acid, while citric acid has a stronger effect, causing the daylily to oxidize and bleach to a white color.

Claims

1. A blanching agent for daylilies, characterized in that, Including sodium metabisulfite, malic acid, and soluble benzoates; The mass ratio of sodium metabisulfite to malic acid is 1:1~10; The mass ratio of sodium metabisulfite to soluble benzoate is 1:0.1~10.

2. The daylily blanching agent according to claim 1, characterized in that, The soluble benzoate includes potassium benzoate and / or sodium benzoate.

3. The daylily blanching agent according to claim 1 or 2, characterized in that, The relationship between the amount of sodium metabisulfite and the amount of daylily raw material is as follows: the mass ratio of sodium metabisulfite to daylily raw material is 2~10:1000.

4. A method for blanching daylily, characterized in that, Take the daylily blanching agent according to any one of claims 1 to 3, add water or not, mix it evenly on the surface of the daylily raw material, and seal and store it at 4℃ to 15℃ for 1 to 15 days to obtain blanched daylily. Based on mass calculations, the ratio between the raw daylily and the sodium metabisulfite, malic acid, and soluble benzoate in the daylily blanching agent is 1000:2~10:10~20:10~15; The ratio of daylily raw material to water is as follows: mass ratio is 100:0~50.

5. The method for blanching daylily according to claim 4, characterized in that, The daylily raw material is fresh daylily.

6. A method for producing daylily products, characterized in that, Take daylily blanched with the blanching agent according to any one of claims 1 to 3 or daylily blanched with the blanching method according to claim 4 or 5, soak and / or rinse to desulfurize, and obtain desulfurized daylily.

7. The method for producing daylily products according to claim 6, characterized in that, Sodium bicarbonate is used to assist in desulfurization during soaking and / or rinsing.

8. The method for producing daylily products according to claim 7, characterized in that, In the desulfurization process, the sodium bicarbonate used is in the form of a sodium bicarbonate solution with a concentration of 0.1wt% to 2wt%. The blanched daylily is soaked in the sodium bicarbonate solution, and then soaked and / or rinsed with water. The total soaking time of the blanched daylily in the sodium bicarbonate solution is 0.5 to 4 hours. The amount of sodium bicarbonate solution used is 0.5 to 5 times the mass of the daylily raw material.

9. The method for producing daylily products according to any one of claims 6 to 8, characterized in that, Desulfurized daylily is preserved in brine to obtain salted daylily; the sodium chloride content in the brine is 5wt%~20wt%.

10. The method for producing daylily products according to claim 9, characterized in that, The brine used in the salting process contains: 5wt%~20wt% sodium chloride, 0.1wt%~1wt% soluble benzoate, 0.1wt%~0.5wt% ascorbic acid, and 0.01wt%~0.05wt% gardenia yellow.

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