CN113318037B - Microbial fermentation method for improving content of active ingredients of peony flowers and application - Google Patents
Microbial fermentation method for improving content of active ingredients of peony flowers and application Download PDFInfo
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- CN113318037B CN113318037B CN202110776090.3A CN202110776090A CN113318037B CN 113318037 B CN113318037 B CN 113318037B CN 202110776090 A CN202110776090 A CN 202110776090A CN 113318037 B CN113318037 B CN 113318037B
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- 238000000034 method Methods 0.000 title claims abstract description 26
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/96—Cosmetics or similar toiletry preparations characterised by the composition containing materials, or derivatives thereof of undetermined constitution
- A61K8/97—Cosmetics or similar toiletry preparations characterised by the composition containing materials, or derivatives thereof of undetermined constitution from algae, fungi, lichens or plants; from derivatives thereof
- A61K8/9783—Angiosperms [Magnoliophyta]
- A61K8/9789—Magnoliopsida [dicotyledons]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q19/00—Preparations for care of the skin
- A61Q19/02—Preparations for care of the skin for chemically bleaching or whitening the skin
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q19/00—Preparations for care of the skin
- A61Q19/08—Anti-ageing preparations
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/74—Biological properties of particular ingredients
- A61K2800/78—Enzyme modulators, e.g. Enzyme agonists
- A61K2800/782—Enzyme inhibitors; Enzyme antagonists
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/80—Process related aspects concerning the preparation of the cosmetic composition or the storage or application thereof
- A61K2800/85—Products or compounds obtained by fermentation, e.g. yoghurt, beer, wine
Abstract
The invention relates to the field of plant application methods, and in particular discloses a microbial fermentation method for improving the content of active ingredients of peony, which comprises the following steps: s1, drying and crushing fresh peony flowers into peony flower powder, mixing with distilled water, and performing ultrasonic treatment to obtain a mixed solution for later use; s2, inoculating microorganisms into the mixed solution obtained in the step S1, then carrying out fermentation culture, sterilizing, centrifuging, and taking supernatant to obtain peony fermentation liquor, wherein the fermentation conditions are as follows: the inoculation amount is 1-10%, the temperature is 36-37 ℃, the fermentation time is 12-48h, and the initial pH is 5-7. The peony fermentation liquor prepared by the fermentation method has obviously improved contents of peony flavone and polyphenol, and obviously improved antioxidant and whitening effects.
Description
Technical Field
The invention relates to the field of plant application methods, in particular to a microbial fermentation method for improving the content of active ingredients of peony flowers and application thereof.
Background
Peony (Paeonia suffruticosa andr.) is a dicotyledonous plant of the genus Paeoniaceae, and is a perennial deciduous shrub. It is mainly produced in the areas of Shandong lotus and Henan Luoyang. It is one of the most important ornamental plants in the international flower market. The flower is big, single, usually dark red, pink and white, and is deeply favored by people because of the luxury, rich and modesty of flowers, and the reputation of the king in flowers is known. The peony has ornamental value and important economic value. Paeonia ostii which is published by 10-month national health and family Committee in 2013 can be used as a new food raw material, and Paeonia ostii series extract which is published by the national drug and food administration in 6-month 2015 can be used as a cosmetic raw material. The peony contains rich nutrients necessary for organisms, including vitamins, proteins, saccharides, anthocyanin, mineral elements and the like, and can play roles in resisting aging and resisting external adverse environments. In addition, the peony also contains flavonoid and polyphenol compounds such as astragalin, gallic acid and the like, and the substances not only can remove free radicals in the initiation stage of the chain reaction, but also can directly capture the free radicals in the free radical reaction chain, and play a role in dual antioxidation in blocking the free radical reaction chain. Researchers analyze the whole phenolic profile and the antioxidant activity of different organs of peony (red-phoenix white) to find that the flavonoid glycoside content in petals is higher than that of other organs, and the flower petal is a potential functional food raw material and a natural antioxidant raw material.
The peony is used as a raw material of cosmetics, has the effects of resisting oxidation and whitening skin, but the common extraction method has limited capability of obtaining active ingredients and has the problem of solubility, so that the application of the peony extract in cosmetics is limited and is not popularized.
Disclosure of Invention
In order to solve the technical problems, the invention provides a microbial fermentation method for improving the content of active ingredients of peony and application thereof, and the peony fermentation liquid prepared by the microbial fermentation method has obviously improved content of flavone and polyphenol of peony and obviously improved antioxidant and whitening effects.
The first object of the invention is to provide a microbial fermentation method for improving the content of active ingredients of peony, which comprises the following steps:
s1, drying and crushing fresh peony flowers into peony flower powder, mixing with distilled water, and performing ultrasonic treatment to obtain a mixed solution for later use;
s2, sterilizing and cooling the mixed solution prepared in the step S1, inoculating probiotics, fermenting and culturing, centrifuging, and taking supernatant to obtain peony fermentation liquor;
the probiotics are lactobacillus plantarum or streptococcus thermophilus;
the fermentation conditions are as follows: the inoculation amount is 1-10vol%, the temperature is 36-37 ℃, the fermentation time is 12-48h, and the initial pH of the fermentation liquid is 5-7.
Preferably, in S2, the fermentation conditions are: the inoculation amount is 1vol%, the fermentation time is 36h, and the initial pH of the fermentation liquid is 6.5.
Preferably, in S1, the dosage ratio of the peony powder to distilled water is 7.5g:140-160mL.
Preferably, in S1, the drying condition is vacuum drying at 50 ℃.
Preferably, in S1, the ultrasonic treatment condition is ultrasonic at 60 ℃ for 30min.
Preferably, in S2, the centrifugation is performed for 10min under 10000 r/min.
The second object of the present invention is to provide a peony fermentation broth prepared by the microbial fermentation method.
The third object of the invention is to provide an application of the peony fermentation broth in preparing skin care products.
Preferably, the peony fermentation broth is used for preparing an antioxidant skin care product.
Preferably, the peony fermentation broth is used for preparing skin care products with whitening effect.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the microbial fermentation method, the peony fermentation liquor is obtained through fermentation under specific fermentation conditions (the inoculation amount is 1-10vol%, the temperature is 36-37 ℃, the fermentation time is 12-48h, and the initial pH is 5-7), and detection results show that the contents of peony flavone and polyphenol in the peony fermentation liquor are obviously improved, and the measurement of DPPH free radical, hydroxyl free radical, ABTS free radical clearance rate and tyrosinase inhibition rate shows that the peony fermentation liquor obtained by the method of the invention has obviously improved antioxidant and whitening effects and has application prospects for preparing skin care products.
2. The invention discovers that the preferred inoculation amount is 1vol%, the temperature is 36 ℃, the fermentation time is 36h, when the initial pH is 6.5, the content of the peony flavone and polyphenol in the peony fermentation liquid is highest in improvement degree, and the antioxidation effect is most obvious (and has obvious difference with other parameters).
3. The invention combines the traditional plant resources of China with the modern fermentation technology, utilizes the peony and probiotics to ferment to obtain the peony fermentation liquor, has advantages in the aspects of safety, toxic and side effects, effectiveness and the like, and has great application potential in the application field of cosmetics.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph showing the growth of Lactobacillus plantarum according to the present invention;
FIG. 2 shows IC of flavone content and DPPH free radical in peony fermentation broth under different inoculum size of Lactobacillus plantarum according to the invention 50 A value;
FIG. 3 shows IC of flavone content and DPPH free radical in peony fermentation broth at different fermentation times in the present invention 50 A value;
FIG. 4 shows IC of flavone content and DPPH free radical in peony fermentation broth at different initial pH values in the present invention 50 A value;
FIG. 5 shows the polyphenol content of the aqueous extract of peony, the sterilized aqueous extract of peony, the streptococcus thermophilus fermentation broth of peony and the lactobacillus plantarum fermentation broth of peony in the present invention;
FIG. 6 shows the flavone content of aqueous peony extract, sterilized aqueous peony extract, streptococcus thermophilus broth and Lactobacillus plantarum broth according to the present invention;
FIG. 7 shows DPPH radical scavenging rate of aqueous peony extract, sterilized aqueous peony extract, streptococcus thermophilus broth and Lactobacillus plantarum broth in accordance with the present invention;
FIG. 8 shows the hydroxyl radical scavenging rate of aqueous peony extract, sterilized aqueous peony extract, streptococcus thermophilus broth and Lactobacillus plantarum broth of the present invention;
FIG. 9 shows the ABTS radical scavenging rate of aqueous peony extract, sterilized aqueous peony extract, streptococcus thermophilus broth, and Lactobacillus plantarum broth in accordance with the present invention.
FIG. 10 shows tyrosinase inhibition rate of aqueous extract of peony, sterilized aqueous extract of peony, streptococcus thermophilus broth of peony and lactobacillus fermentation broth of peony plant in the present invention.
Detailed Description
The following detailed description of specific embodiments of the invention is, but it should be understood that the invention is not limited to specific embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The experimental methods described in the examples of the present invention are conventional methods unless otherwise specified.
Example 1
The embodiment provides a microbial fermentation method for improving the content of active ingredients of peony.
1. Lactobacillus plantarum fermented peony
1. Determination of strain growth curve
Inoculating activated Lactobacillus plantarum into MRS liquid culture medium, culturing in a constant temperature incubator at 36deg.C, measuring viable count at corresponding time by plate colony counting method, taking out at corresponding time, transferring into cuvette, measuring absorbance of Lactobacillus plantarum culture solution at 600nm with distilled water as blank control, recording, taking culture time as abscissa, and taking viable count and OD as standard 600 The growth curve (shown in FIG. 1) was plotted on the ordinate, and the optimal activation culture time of Lactobacillus plantarum was determined to be 24h.
2. Raw material treatment
Drying fresh peony flower in a vacuum drying oven at 50 ℃, preparing peony flower powder by using a pulverizer, sieving with a 80-mesh sieve, weighing 7.5g, mixing with 150mL of distilled water, performing ultrasonic treatment at 60 ℃ for 30min, and centrifuging at 10000r/min for 10min, wherein the supernatant is taken as an aqueous extract of the peony flower as a control. And (3) performing high-pressure steam sterilization at 121 ℃ for 20min after ultrasonic treatment, centrifuging for 10min under the same conditions, and taking supernatant to obtain a sterilized peony flower water extract.
3. Microbial fermentation
Drying fresh peony in a vacuum drying oven at 50 ℃, preparing peony powder by using a pulverizer, sieving with a 80-mesh sieve, weighing 7.5g, mixing with 150mL of distilled water, carrying out ultrasonic treatment at 60 ℃ for 30min, carrying out high-pressure steam sterilization at 121 ℃ for 20min, cooling to room temperature, adding lactobacillus plantarum activated for 24h according to 1vol% inoculum size into the mixture, culturing in a constant-temperature incubator at 36 ℃ for 48h, centrifuging (10000 rpm,10 min) to obtain peony fermentation liquor, and respectively measuring the flavone content and DPPH removing capacity of the peony water extract, the sterilized peony water extract and the peony fermentation liquor by taking the peony water extract as a reference.
Example 2
This embodiment is substantially the same as embodiment 1 except that:
the inoculum size of Lactobacillus plantarum was 2vol%.
Example 3
This embodiment is substantially the same as embodiment 1 except that:
the inoculum size of Lactobacillus plantarum was 5vol%.
Example 4
This embodiment is substantially the same as embodiment 1 except that:
the inoculum size of Lactobacillus plantarum was 10vol%.
The flavonoid content and DPPH removing ability of the peony fermentation broths prepared in the above examples 1-4 were tested, and the results are shown in FIG. 2.
As shown in FIG. 2, compared with the peony water extract, the flavone content and DPPH removing capacity of the peony fermentation liquor prepared in examples 1-3 are both obviously improved, and extremely obvious differences (#P is less than or equal to 0.01) exist;
compared with the sterilized peony water extract, the peony fermentation liquor prepared in the embodiment 1 has obvious difference in flavone content (P is less than or equal to 0.01); there was a significant difference in DPPH clearance (0.01 < p.ltoreq.0.05).
Example 5
This embodiment is substantially the same as embodiment 1 except that:
culturing in a constant temperature incubator at 36 ℃ for 12 hours respectively, namely, fermenting for 12 hours.
Example 6
This embodiment is substantially the same as embodiment 1 except that:
culturing in a 36 deg.C constant temperature incubator for 24 hr respectively, i.e. fermentation time is 24 hr.
Example 7
This embodiment is substantially the same as embodiment 1 except that:
culturing in a constant temperature incubator at 36 ℃ for 36h respectively, namely, fermenting for 36h.
The peony fermentation broths obtained in examples 5-7 above were tested for flavone content and DPPH scavenging ability, and example 7 was found to be best. As shown in FIG. 3, there was a very significant difference (#P.ltoreq.0.01) compared to the aqueous extract of peony and a significant difference (.p.ltoreq.0.01, 0.01< P.ltoreq.0.05) compared to the aqueous extract of sterilized peony.
Example 8
This embodiment is substantially the same as embodiment 1 except that:
the initial pH value of the mixed solution is respectively regulated to 5 by using a 1% NaOH solution, the mixed solution is sterilized by high-pressure steam at 121 ℃ for 20min, after the mixed solution is cooled to room temperature, activated lactobacillus plantarum is inoculated according to the proportion of 1vol%, and the peony water extract and the sterilized peony water extract are used as controls. Culturing in a 36 deg.C incubator for 24 hr, centrifuging (10000 rpm,10 min), and collecting supernatant to obtain flos moutan fermentation broth. And (3) respectively measuring the flavone content and DPPH (digital ph) removing capacity of the peony water extract, the sterilized peony water extract and the peony fermentation liquor.
Example 9
This embodiment is substantially the same as embodiment 8 except that:
the initial pH was adjusted to 6.
Example 10
This embodiment is substantially the same as embodiment 8 except that:
the initial pH was adjusted to 6.5.
Example 11
This embodiment is substantially the same as embodiment 8 except that:
the initial pH was adjusted to 7.
The aqueous extracts of peony in examples 8-11 above were measured, and the flavone content and DPPH scavenging ability thereof in the sterilized aqueous extracts of peony and the peony fermentation broth were found to be optimal in example 10 (as shown in FIG. 4), with a very significant difference (#P. Ltoreq.0.01) compared to the aqueous extracts of peony and a significant difference (.p. Ltoreq.0.01; 0.01< P. Ltoreq.0.05) compared to the sterilized aqueous extracts of peony, respectively.
Example 12
1. Method for measuring flavone content
(1) Preparation of a standard curve: accurately weighing 25mg of rutin standard substance, and fixing volume to 25mL with absolute ethyl alcohol to obtain rutin standard substance solution. The amounts of each reagent in Table 2 were accurately aspirated, shaken well, left to stand for 15min, and absorbance was measured at a wavelength of 510 nm. And drawing a standard curve by taking different rutin concentrations as an abscissa and the corresponding absorbance as an ordinate, and solving a regression equation.
TABLE 1 rutin Standard Curve sample addition
Determination of total flavone content: and (3) carrying out reaction on the sample according to the method for manufacturing the standard curve to determine the absorbance value, substituting the absorbance value into a linear equation, and calculating the total flavone content.
(2) DPPH radical scavenging assay
Adding samples according to the following table 2, placing the samples in a dark place for 30min, measuring the absorbance at 517nm wavelength, calculating the DPPH free radical clearance of different samples, and taking Vc as a positive control, wherein the determination formula of the DPPH free radical clearance is as follows:
wherein A is 0 : absorbance values for the blank control group; absorbance values for each sample.
TABLE 2 DPPH free radical scavenging test sample addition
2. Probiotic fermented peony
1. Preparation of samples
The peony dried flowers are prepared into peony flower powder by a pulverizer, sieving with a 80-mesh sieve, weighing 7.5g of sieved pollen, mixing with 150mL of distilled water, performing ultrasonic treatment at 60 ℃ for 30min, and centrifuging at 10000r/min for 10min, and collecting supernatant, namely the peony flower water extract. And (3) carrying out high-temperature high-pressure sterilization after ultrasonic treatment, cooling, centrifuging, and taking the supernatant to obtain the sterilized peony flower water extract.
Inoculating lactobacillus plantarum into MRS culture medium for strain activation and expansion culture for 24 hours, inoculating 1vol% of bacterial liquid into the mixed liquid which is not centrifuged after high-temperature high-pressure sterilization, and culturing for 24 hours in a constant temperature oven at 37 ℃ to obtain a fermentation product. Centrifuging at 10000r/min for 10min, discarding precipitate, and collecting supernatant to obtain lactobacillus plantarum fermentation broth.
Inoculating the preserved streptococcus thermophilus into an M17 culture medium for strain expansion culture, inoculating 5vol% of bacterial liquid into the mixed liquid which is not centrifuged after high-temperature high-pressure sterilization, and fermenting in a constant temperature oven at 42 ℃ for 48 hours to obtain a fermentation product. The post-treatment of the fermentation product is the same as the post-treatment of lactobacillus plantarum fermentation liquor, so as to obtain the streptococcus thermophilus fermentation liquor of the peony flower.
2. Changes of main components before and after the fermentation of peony by probiotics
(1) And (3) measuring polyphenol content: the sample was applied as in Table 3, left in the dark for 30min, absorbance was measured at 750nm, and the replicates were repeated 3 times. And drawing a standard curve by taking different gallic acid concentrations as an abscissa and the corresponding absorbance as an ordinate, and solving a regression equation.
TABLE 3 addition of solutions to gallic acid Standard Curve
Taking peony water extract, sterilized peony water extract, peony streptococcus thermophilus fermentation liquor and peony lactobacillus plantarum fermentation liquor, measuring the polyphenol content of the samples according to the method for manufacturing the standard curve, recording the absorbance value of each sample, substituting the absorbance value into a linear equation, and calculating the polyphenol content.
(2) Flavone content determination
Preparation of a standard curve, accurately weighing 25mg of rutin standard substance, and fixing the volume to 25mL by using absolute ethyl alcohol to obtain a rutin standard substance solution. The amounts of each reagent in Table 2 were accurately aspirated, shaken well, left to stand for 15min, and absorbance was measured at a wavelength of 510 nm. And drawing a standard curve by taking different rutin concentrations as an abscissa and the corresponding absorbance as an ordinate, and solving a regression equation.
Taking the peony water extract, the sterilized peony water extract, the peony streptococcus thermophilus fermentation liquor and the peony lactobacillus plantarum fermentation liquor, measuring the total flavone content of the samples according to the method for manufacturing the standard curve, recording the absorbance value of each sample, substituting the absorbance value into a linear equation, and calculating the total flavone content.
3. Changes of antioxidation and whitening effects before and after fermentation of peony by probiotics
(1) DPPH radical scavenging assay
The DPPH free radical scavenging experiment has the advantages of simplicity, convenience, direct feasibility and is widely used for research of antioxidants. DPPH+H + DPPH-H, at 517The absorption at nm is strong, the absorbance of the system at the maximum absorption wavelength becomes small after the antioxidant substance is added, and the color of the solution becomes light.
Taking the reagents in Table 2, mixing uniformly, placing for 30min at room temperature in a dark place, measuring absorbance at 517nm, and measuring the DPPH free radical clearance rate according to the formula:
wherein A is 0 : absorbance values for the blank control group; absorbance values for each sample.
(2) Determination of the free radical scavenging Rate of hydroxyl groups
The reaction mechanism of the hydroxyl radical scavenging test is: h 2 O 2 +Fe 2+ =·OH+H 2 O+Fe 3+ Then adding salicylic acid into the reaction system, wherein if a substance with the function of removing hydroxyl radicals is added into the reaction system, the hydroxyl radicals are consumed, so that the hydroxyl radicals in the system are reduced, the generation of 2, 3-dihydroxybenzoic acid is reduced, namely the generation amount of colored compounds is correspondingly reduced, and the absorbance is reduced when the reaction solution containing the antioxidant substance is measured at 510 nm.
Taking the reagents in Table 4, mixing uniformly, standing for 30min at 37 ℃, and measuring absorbance value at 510nm wavelength by adopting an enzyme-labeled instrument, wherein the formula for measuring the hydroxyl radical clearance is as follows:
TABLE 4 determination of hydroxyl radical removal test sample loading
(3) ABTS radical scavenging assay
The reaction principle of ABTS radical scavenging is: ABTS+K 2 S 2 O 8 →ABTS + (blue-green) +K 2 SO 4 The ABTS produced by this reaction has maximum absorption peaks at 734nm,414nm, 640 nm and 805nm, if free to scavengeThe radical compound reacts with ABTS to become ABTS without color. The absorbance of the reaction was measured at 734nm and its corresponding clearance calculated.
The reagents in Table 5 were taken separately, mixed well, left at room temperature in the dark for 30min, and absorbance values were measured at 734 nm. ABTS radical clearance was calculated for each sample as per equation (3).
Wherein A is 0 : absorbance values for the blank control group; absorbance values for each sample.
TABTS radical scavenging assay load
(4) Tyrosinase inhibition effect determination
The reagents in Table 6 were mixed uniformly, left at 37℃for 25min, and absorbance at 490nm was measured.
ABTS radical clearance was calculated for each sample as per equation (4).
Wherein T is absorbance of the mixed solution without adding the sample extracting solution and the enzyme; t0 is absorbance of the mixed solution without adding enzyme and the sample extracting solution; c is absorbance of the mixed solution of the sample extracting solution and the enzyme; c0 is absorbance of the mixed solution with the sample extracting solution and without enzyme.
TABLE 6 liquid feeding sequence for tyrosinase inhibition experiments
4. Detection result
(1) The contents of polyphenol and flavone in the peony water extract, the sterile peony water extract, the peony streptococcus thermophilus fermentation liquor and the peony lactobacillus plantarum fermentation liquor are detected by the method, and the detection results are shown in fig. 5 and 6.
The microbial fermentation method adopted by the invention has obvious improvement on the contents of the flavonoids and the polyphenols in the peony flowers.
(2) DPPH radical scavenging Rate measurement test results
The measurement results of DPPH free radical clearance after different gradient dilutions of the peony water extract, the sterile peony water extract, the peony streptococcus thermophilus fermentation liquor and the peony lactobacillus plantarum fermentation liquor are shown in figure 7, and the DPPH clearance of the extract and the fermentation liquor all show the trend of rising and then reducing with the reduction of concentration, and the DPPH clearance of the peony streptococcus thermophilus fermentation liquor and the lactobacillus plantarum fermentation liquor is higher than that of the peony water extract and the sterile water extract between 1.25% and 10%. Its free radical scavenging rate IC 50 The values are shown in Table 7, IC 50 Lower values indicate better radical scavenging in this regard.
TABLE 7 DPPH radical scavenger IC 50 Value of
The results show that the DPPH free radical scavenging activity (IC) of the streptococcus thermophilus fermentation broth and the lactobacillus plantarum fermentation broth 50 The values are respectively 1.41 percent and 1.37 percent which are obviously higher than the water extract of the peony flowers and the sterilized water extract (IC) of the peony flowers 50 The values are respectively 2.45 percent and 1.74 percent, and the cleaning effect of the two fermentation broths is not obvious. The reasons for this analysis may be: the peony extract is subjected to high-pressure heating and liquid fermentation, the plant cell wall is damaged and is easy to break, and the enzyme system secreted by microorganisms can degrade the cell wall, so that active ingredients such as flavone, polyphenol and the like in the peony extract are easily dissolved out, the content of the peony extract is improved to different degrees, and the flavone and the polyphenol have antioxidant capacity, so that the antioxidant capacity of the peony extract is remarkably improved after fermentation.
(3) Results of the measurement of the hydroxyl radical removal Rate
The results of measuring the hydroxyl radical clearance of the peony water extract, the sterilized peony water extract, the peony streptococcus thermophilus fermentation liquor and the peony lactobacillus plantarum fermentation liquor are shown in figure 8, and the hydroxyl radical clearance of the extract and the fermentation liquor all show a trend of decreasing along with the decrease of the concentration, and the hydroxyl radical clearance of the peony streptococcus thermophilus fermentation liquor and the lactobacillus plantarum fermentation liquor are higher than those of the peony water extract and the sterilized water extract. Its hydroxy radical scavenging rate IC 50 The values are shown in Table 8.
TABLE 8 hydroxyl radical scavenging IC 50 Value of
The results show that the hydroxy radical scavenging ability (IC) of the lactobacillus fermentation broth of the peony plant and the streptococcus thermophilus fermentation broth of the peony plant 50 The values are respectively 12.27 percent and 12.50 percent which are obviously higher than the water extract of the peony flower and the sterilized water extract (IC) 50 Values were 21.31%, 18.07%, respectively). The two fermentation broths have no obvious difference in the ability to scavenge hydroxyl radicals.
(4) ABTS radical scavenging assay results
The results of measuring ABTS free radical clearance of the peony water extract, the sterile peony water extract, the peony streptococcus thermophilus fermentation liquor and the peony lactobacillus plantarum fermentation liquor are shown in figure 9, and the ABTS free radical clearance IC 50 The values are shown in Table 9.
TABTS radical clearance IC 50 Value of
The results show that ABTS radical scavenging rate of all samples showed a trend of increasing followed by decreasing with decreasing concentration. The clearance rate of the peony streptococcus thermophilus fermentation liquor and the peony lactobacillus plantarum fermentation liquor to the ABTS free radicals is higher than that of the water extract and the sterilized water extract when the peony streptococcus thermophilus fermentation liquor and the peony lactobacillus plantarum fermentation liquor are between 0.16 percent and 0.63 percent and more than 10 percent,wherein the peony lactobacillus plantarum fermentation broth and the peony streptococcus thermophilus fermentation broth (IC) 50 The hydroxyl radical scavenging ability of the values divided into 0.295 percent and 0.296 percent is obviously higher than that of the aqueous extract of the peony flower and the sterilized aqueous extract (IC) 50 Values 0.416%, 0.362%). Compared with fermentation liquor of different strains, the ABTS free radical scavenging capability of the lactobacillus plantarum fermentation liquor is not very different from that of the streptococcus thermophilus fermentation liquor.
(5) Measurement of tyrosinase inhibitory Effect
The results of measuring tyrosinase inhibition effects of the aqueous extract of peony, the sterile aqueous extract of peony, the streptococcus thermophilus fermentation broth of peony and the lactobacillus fermentation broth of peony plant are shown in FIG. 10, and the tyrosinase inhibition rate IC thereof 50 The values are shown in table 10.
TABLE 10 tyrosinase inhibition rate IC 50 Value of
The results show that the tyrosinase inhibition rate of all samples showed a trend of decreasing with the decrease of the concentration, and the inhibition rate of both fermentation broths was high as Yu Shuidi liquid. Peony lactobacillus plantarum fermentation broth and peony streptococcus thermophilus fermentation broth (IC) 50 The tyrosinase inhibition effect of the composition with the values of 1.325 percent and 1.374 percent is obviously higher than that of the peony flower water extract (IC) 50 A value of 2.435%) and a sterilized aqueous extract (IC) 50 The value is 1.988%), and the tyrosinase inhibition effect of the peony lactobacillus plantarum fermentation liquor and the peony streptococcus thermophilus fermentation liquor is higher than that of the sterilized water extract.
Lactobacillus plantarum (strain deposit number is CICC 20265) and streptococcus thermophilus (strain deposit number is CICC 20370) used in the present invention are purchased from China industry microbiological culture Collection center.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A microbial fermentation method for improving the content of active ingredients of peony flowers is characterized by comprising the following steps:
s1, drying and crushing fresh peony flowers into peony flower powder, mixing with distilled water, and performing ultrasonic treatment to obtain a mixed solution for later use;
s2, sterilizing and cooling the mixed solution obtained in the step S1, inoculating probiotics, fermenting and culturing, centrifuging, and taking supernatant to obtain peony fermentation liquor;
the probiotics are lactobacillus plantarum or streptococcus thermophilus;
the lactobacillus plantarum strain is deposited with the number CICC 20265 and is purchased from China center for type culture collection of industrial microorganisms;
the streptococcus thermophilus strain is deposited with the number of CICC 20370 and purchased from China center for type culture collection of industrial microorganisms;
the fermentation conditions of the lactobacillus plantarum are as follows: the inoculation amount is 1-10vol%, the temperature is 36-37 ℃, the initial pH of the mixed solution is 5-7, the fermentation time is 12-48h,
the fermentation conditions of streptococcus thermophilus are as follows: the inoculation amount is 5-10 vol%, the temperature is 42 ℃, the initial pH of the mixed solution is 5-7, and the fermentation time is 48 hours;
in S1, the dosage ratio of the peony powder to distilled water is 7.5g:140-160mL.
2. The microbial fermentation method for increasing the content of active ingredients of peony according to claim 1, wherein in S1, the drying condition is vacuum drying at 50 ℃.
3. The microbial fermentation method for increasing the content of active ingredients of peony according to claim 1, wherein in S1, the ultrasonic treatment condition is ultrasonic at 60 ℃ for 30min.
4. The microbial fermentation method for increasing the content of active ingredients of peony according to claim 1, wherein in S2, the centrifugation is performed for 10min under 10000 r/min.
5. A peony fermentation broth prepared by the microbial fermentation method for increasing the content of peony active ingredients according to claim 1.
6. Use of the peony fermentation broth of claim 5 in the preparation of skin care products.
7. The use of the peony fermentation broth according to claim 6 for preparing a skin care product, wherein the peony fermentation broth is used for preparing an antioxidant skin care product.
8. The use of the peony fermentation broth according to claim 6 for preparing skin care products, wherein the peony fermentation broth is used for preparing skin care products with whitening effect.
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