Lactobacillus plantarum 299V improves the microbiological quality of legume sprouts and effectively survives in these carriers during cold storage and in vitro digestion

Abstract

Probiotics improve consumers’ health and additionally may positively influence the microbiological and organoleptic quality of food. In the study, legume sprouts were inoculated with Lactobacilllus plantarum 299V to produce a new functional product ensuring the growth and survival of the probiotic and high microbiological quality of the final product. Legume sprouts, which are an excellent source of nutrients, were proposed as alternative carriers for the probiotic. The key factors influencing the production of probiotic-rich sprouts include the temperature (25°C) of sprouting and methods of inoculation (soaking seeds in a suspension of probiotics). Compared to the control sprouts, the sprouts enriched with the probiotic were characterized by lower mesophilic bacterial counts. In the case of fresh and stored probiotic-rich sprouts, lactic acid bacteria (LAB) accounted for a majority of total microorganisms. The Lb. plantarum population was also stable during the cold storage. The high count of LAB observed in the digest confirmed the fact that the studied sprouts are effective carriers for probiotics and ensure their survival in the harmful conditions of the digestive tract in an in vitro model. Enrichment of legume sprouts with probiotics is a successful attempt and yields products for a new branch of functional foods.

Introduction

Probiotics are “live strains of strictly selected microorganisms which, when administered in adequate amounts, confer a health benefit on the host” [1], [2]. In nature, Lactobacillus plantarum is found in a variety of ecological niches, ranging from vegetables and fermented food (e.g. vegetables, cheeses, meat) to the human gastrointestinal tract [3], [4]. Lb. plantarum 299V is widely used as a single probiotic or in synbiotic formulations and exhibits a wide range of positive effects on human health. The effectiveness of Lb. plantarum 299V for treatment of gastrointestinal diseases (e.g., inflammatory bowel disease, diarrheas), allergic diseases (e.g., atopic dermatitis), obesity, insulin resistance syndrome, type 2 diabetes, and nonalcoholic fatty liver disease has been confirmed by many clinical studies [5], [6], [7]. Furthermore, probiotic strains of Lb. plantarum are also responsible for immunomodulation (increasing human immunity), and can thus be used as a prophylactic agent and/or cure for autoimmune disorders, inflammation, and different types of cancers and side effects associated with cancer [8], [9].

Probiotics are usually delivered as food supplements in the form of tablets or capsules [1]. In such formulations, they are usually combined with prebiotics, which are selective substrates for one or a limited number of probiotics [5], [10]. On the other hand, probiotics can also positively influence the microbiological and organoleptic quality of food; thus, they are widely incorporated into traditional food products, e.g., dairy products, fermented vegetables, and meats [3], [11], [12]. In recent years, some alternative matrices, e.g., chocolate, fruit drink, and cut fruits have been employed as carriers for these beneficial microorganisms [13], [14]. This need for alternative matrices is related to the new diet habits, e.g., veganism and/or the higher number of consumers with diet restrictions such as those with lactose intolerance, allergies, and cholesterol restriction.

Legumes are an excellent source of nutrients (including resistant starch, which can make them effective prebiotics) and components with well-documented pro-health properties, e.g., fiber, phenolics, or vitamins [15], [16]. Additionally, the quality of pulses can be improved by sprouting, i.e. a process effectively increasing nutrient digestibility, bioavailability of minerals, and the content of low-molecular weight antioxidants [17], [18]. Sprouted food is susceptible to microbiological invasion due to the presence of simple nutrients (free sugars, vitamins, and amino acids), high content of water, and the fact that seeds used for germination cannot be sterilized [19], [20]. To preserve the shelf life of sprouts, many techniques are employed including chemical (limited by formation of by-products, which could have implications for human health) [21] and physical treatments [22].

A new functional food based on legume sprouts and Lb. plantarum was designed for the first time. It was assumed that such a combination ensures both the growth and survival of the probiotic and high microbiological quality of the final product. The factors affecting production of probiotic-rich sprouts, including selection of legume species, conditions of germination, and methods for inoculation with the probiotics, were optimized in the screening studies. For the selected preparations, microbiological quality (degree of contamination) and the Lb. plantarum survival efficiency during cold storage and in vitro digestion were determined.

Materials and methods

Materials

All chemicals used for cultivation of sprouts and microbiological media were purchased from Sigma–Aldrich company (Poznan, Poland) and BTL Ltd. (Łodz, Poland). Soybean, lentil, adzuki bean, and mung bean seeds were purchased from PNOS S.A. in Ozarów Mazowiecki, Poland.

The Lb. plantarum 299V strain was isolated from a commercial probiotic preparation. The culture was tested for cell morphology; biochemical tests and 16S rRNA sequencing were performed as well. Bacterial stocks used for the inoculation were stored at –80°C in MRS broth with 20% (v/v) glycerol. Prior to inoculation, aerobic cultures on MRS agar were cultivated twice for 24 h at 37°C. Then, the colonies were sterilely collected from Petri dishes, suspended in water, and used for inoculation of the sprouts. For preparation of the inoculum, the bacterial concentration was estimated by optical density (OD) analysis at 600 nm using a spectrophotometer Smart Spec Plus (Bio-Rad, USA). A previously determined standard curve was used to determine the number of cells in the suspension at the level of 9.00 log10 CFU/mL on the basis of the OD value.

Production of probiotic-rich sprouts

Sprouting conditions.

Seeds were disinfected in 1% (v/v) sodium hypochlorite for 10 min, drained, and washed with distilled water until they reached neutral pH. Then, they were soaked in distilled water (C, control) or a Lb. plantarum 299V water suspension (1 × 108 CFU per 1 g of seeds (8.00 log 10 CFU/ g)) (S, soaked with the probiotic). Lentil, soybean, adzuki bean, and mung bean seeds were soaked for 4, 4, 6, and 8 h, respectively. The seeds (approximately 12 g per plate) were dark-germinated for 4 days in a growth chamber (SANYO MLR-350H) on Petri dishes (Ø 125 mm) lined with absorbent paper. Seedlings were sprayed daily with 5 mL of Milli-Q water (C, S) or 5 mL of water suspension of the probiotic only on the 1st day of cultivation (1 × 108 CFU per 1 g of seeds (8.00 log 10 CFU/ g)) (W, watered with the probiotic). Sprouting was carried out at 25°C, 30°C, and 35°C (25, 30, and 35, respectively) with relative humidity 90%. In the screening studies, the sprouts were manually collected after 4 days and analyzed for sprouting efficiency, biomass accumulation, and the number of viable lactic acid bacteria [23]. During the production of the probiotic-rich sprouts, 4-day-old sprouts were manually collected and immediately used for the test (fresh sprouts) or were stored in polypropylene boxes at 4°C for 7 days (stored sprouts).

Assessment of probiotic production efficiency

Assessment of sprouting efficiency.

The seed germination percentage was calculated using the following formula:

Biomass accumulation.

Sprout biomass accumulation was expressed as the mass of 10 sprouts. For each variant of sprouting, at least 100 sprouts were weighted [24]

Counting of Lb. plantarum 299V viable cells.

Once sprouting was completed, the samples were collected and the total number of lactic bacteria cells was determined. To this end, 1 g of the sprouts was gently homogenized with 9 mL of Ringer’s solution and shaken for 10 min (60 rpm). Then, serial decimal dilutions of the sprout samples were done and 0.1 mL aliquots were placed on MRS agar in triplicates and incubated aerobically at 37°C for 48 h. The characteristic colonies were counted and their numbers were calculated as CFU/g of the fresh weight of sprouts.

Efficiency factor.

To sum up the final effect of the protocol proposed for the probiotic-rich sprouts, the efficiency factor was calculated [23]:

Microbiological quality

The following microbiological analyses were performed in accordance with Polish or European standards.

Total mesophilic bacteria.

The total number of mesophilic bacteria was determined with the plate technique on nutrient agar according to PN-EN ISO 4833–2:2013 [25].

Lactic acid bacteria.

The number of lactic acid bacteria was determined with the plate technique on MRS agar according to PN-ISO 15214:2002 [26].

Molds and yeasts.

The number of yeasts and molds was determined with the plate technique on agar with glucose, yeast extract, and chloramphenicol according to PN-ISO 21527–1:2009 [27]. Yeast and molds were differentiated according to the morphology of colonies.

Coliforms.

Coliforms were determined with the plate method on VRBL medium according to PN-ISO 4832:2007 [28].

Enterococci

The number of enterococci was determined with the plate method on Slanetz-Bartley agar according to PN-A-86034-10:1993 [29].

Staphylococcus aureus

The number of S. aureus was determined using the Baird-Parker plate method according to PN-EN ISO 6888–1:2001 [30]. A confirmatory test was used to detect coagulase activity (Bactident Coagulase Test).

Bacillus cereus

The number of B. cereus was determined with the plate method on MYP medium according to PN-EN ISO 7932:2005 [31]; typical colonies were subjected to confirmatory tests.

Listeria monocytogenes

The presence of L. monocytogenes was determined by preincubation in half-Fraser broth, selective propagation in Fraser broth, and selection and identification of colonies on Palcam and Oxford media according to PN-EN ISO 11290–1:2017 [32]. In order to confirm the presence of these microorganisms, biochemical tests were performed using a Microbact Biochemical Identification Kit-Listeria Identification Kit 12L (Oxoid Ltd.).

Salmonella spp.

The presence of Salmonella spp. was tested by preincubation in peptone-buffered water, selective propagation in Rappaport-Vasiliadis medium, and isolation and identification of colonies on BGA and XLD agars according to PN-EN ISO 6579–1:2017 [33]. Questionable colonies were subjected to RapID One System (Remel Europe Ltd.) biochemical tests.

Yersinia enterocolitica

The presence of Y. enterocolitica was determined by broth multiplication PSB and identification of colonies on CIN medium according to PN-EN ISO 10273:2017 [34]. In order to confirm their presence, biochemical tests using Rapid One System (Remel Europe Ltd.) were performed.

Antimicrobial properties of Lb. plantarum against selected foodborne pathogens

The Lb. plantarum 299V strains were described for antagonistic activity using the well diffusion method. Sterile Petri dishes were poured with nutrient agar and inoculated with the culture of each indicator strain separately (concentration 6 log CFU/mL) to obtain the growth in the form of turf. For the study, common food-borne pathogens (E. coli, S. aureus, B. cereus, S. enterica sv. Enteritidis, S. enterica sv. Anatum, and L. monocytogenes) isolated from unprocessed food of plant origin were used. After solidification, wells with a 9.0-mm diameter were cut out and filled with 100 μL of the cultures of Lb. plantarum. The plates were incubated at 37°C for 48 h and the diameters of growth inhibition zones were measured. Antimicrobial activity (x) was calculated as follows: x = Dd, where D is the inhibition zone diameter and d is the well diameter. Antimicrobial activity (x) was characterized and classified based on the inhibition growth zone diameters and described as low (x < 4 mm diameter), medium (x = 4–8 mm), high (x = 8–12 mm), and very high (x > 12 mm) [11].

In vitro digestion

In vitro digestion was performed as described previously [35]. For simulated mastication and gastrointestinal digestion, 2 g of fresh sprouts were homogenized in 1.0 mL PBS buffer and 1 mL of simulated salivary fluid [15.1 mmol/L KCl, 3.7 mmol/L KH2PO4, 13.6 mmol/L NaHCO3, 0.15 mmol/L MgCl2 (H2O)6, 0.06 mmol/L (NH4)2CO3, 1.5 mmol/L CaCl2, and α-amylase (75 U/mL)], and shaken for 10 min at 37°C. Next, the samples were adjusted to pH 3 with 6 M HCl, suspended in 4 mL of simulated gastric fluid [6.9 mmol/L KCl, 0.9 mmol/L KH2PO4, 25 mmol/L NaHCO3, 47.2 mmol/L NaCl, and 0.1 mmol/L MgCl2 (H2O)6, 0.5 mol/L (NH4)2CO3, 0.15 mmol/L CaCl2, and pepsin (2,000 U/mL)] and shaken for 120 min at 37°C. After simulated gastric digestion, the samples were adjusted to pH 7 with 1 M NaOH and suspended in 8 mL of simulated intestinal fluid [6.8 mmol/L KCl, 0.8 mmol/L KH2PO4, 85 mmol/L NaHCO3, 38.4 mmol/L NaCl, 0.33 mmol/L MgCl2 (H2O)6, 0.15 mmol/L CaCl2, 10 mmol/L bile extract, and pancreatin (2,000 U/ mL)]. The prepared samples underwent in vitro intestinal digestion for 120 min. Then, serial decimal dilutions of the digest were done in Ringer`s solution and 0.1 ml of aliquots were spread on the MRS agar plate using a glass cell spreader. The plates were incubated aerobically at 30°C for 48 h. Characteristic colonies were counted and their numbers were calculated as CFU/g of fresh weight of the sprouts.

Statistics

All experimental results are mean ± S.D. of three parallel experiments. One-way analysis of variance (ANOVA) and Tukey’s post hoc test were used to compare the groups (STATISTICA 13, StatSoft, Inc., Tulsa, USA). Differences were considered significant at p ≤ 0.05.

Results and discussion

This study evaluated legume sprouts as carriers for Lb. plantarum. In the first step, screening studies were performed to define optimal conditions for subsequent growth of sprouts and probiotics (Table 1).

Generally, the beans (adzuki and mung) sprouted and grew effectively in the studied temperature range. The differences in the growth rate observed between the cultures did not exceed 5%. Most importantly, a significant reduction of the sprouting efficiency was observed at 35°C in the case of lentil and soybean. The largest count of lactic acid bacteria (LAB) was noted in the sprouts obtained at 25°C from seeds imbibed in the water suspension of Lb. plantarum. The LAB in the lentil, soybean, adzuki bean, and mung bean were 7.64, 8.16, 7.86, and 8.05 log10 CFU g−1 f.m., respectively (Table 1). The results of the germination rate, biomass accumulation, and the number of LAB were combined and efficiency factors were proposed (Fig 1).

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Fig 1. Effect of sprouting conditions and inoculation methods on the efficiency of production of probiotic-rich sprouts.

S- sprouts obtained by soaking the seeds in the probiotic; W- sprouts obtained by watering 1-day-old sprouts with the probiotic. 25°C, 30°C, and 35°C- temperature of sprouting. Means followed by different letters are significantly different (n = 9; p≤ 0.05).


https://doi.org/10.1371/journal.pone.0207793.g001

This helped in determination of the conditions that are optimal for probiotic growth (survival) and sprout development. The best conditions for production of probiotic-rich sprouts, regardless of the type of legumes, were the same. The highest values of the efficiency factor were 2.43 × 109, 4.18 × 109, 4.28 × 109, and 8.12 × 109 for the preparations based on lentil, soybean, adzuki bean, and mung bean obtained at 25°C from seeds soaked in the Lb. plantarum water suspension, respectively (Fig 1). Following these results, preparations characterized by the highest value of the efficiency factor were selected for further detailed investigations to assess their microbiological quality and survival of the probiotic during in vitro digestion.

So far, legume sprouts were used as carriers for Lb. rhamnosus GG [23]. It was found that soybean sprouts inoculated by soaking the seeds in a water suspension of the bacteria were the best carrier. Similar to this study, inoculation with the imbibition step was more effective than spraying the 1-day-old sprouts. It may be suggested that bacteria absorbed into the seeds during soaking have access to higher amounts of nutrients necessary for their development and are protected against physical conditions, e.g., oxygen or drying (water activity). The germination temperature, inoculation methods, and legume species strongly influenced the efficiency of the production of probiotic-rich sprouts; a decrease in the sprouting efficiency was also observed in the case of soybean and lentil sprouting at 35°C. Intensive mobilization of storage materials and loosening of the seed structure [16] usually create favorable conditions for development of microbiota; thus, inhibition of sprouting observed at higher temperatures may limit probiotic growth and promote growth of pathogens and yeast able to utilize starch [36].

The results of the effect of Lb. plantarum on the microbiological quality of the control and probiotic-rich sprouts are presented in Table 2.

Compared to the control sprouts, the lentil sprouts enriched with the probiotic were characterized by lower mesophilic bacterial counts (by about 89% and 92% in fresh and stored samples, respectively). Similar behavior was also observed in the fresh and stored probiotic-rich adzuki bean sprouts, stored soybean sprouts enriched with the probiotic, and fresh probiotic-rich mung bean sprouts. Only in the case of the fresh soybean and stored mung bean sprouts enriched with Lb. plantarum, the total count of mesophilic bacteria was higher than in the control counterparts. The lactic acid bacterial count was increased during storage of both the control and enriched sprouts in the all studied samples. In the control sprouts, their content did not exceed 1% of total microorganisms (except soybean sprouts). Most importantly, in the case of fresh and stored probiotic-rich soybean sprouts, LAB accounted for 86% of the total microorganisms. Similar growth was also observed in the preparations based on the lentil, adzuki, and mung bean sprouts. In all the studied samples, the numbers of yeast and molds were low or they were not detected. Coliforms were not present in the fresh samples but were detected after storage. No pathogenic Listeria monocytogenes, Salmonella spp., or Y. enterocolitica were found in any of the analyzed samples. Only in the case of the fresh and stored control soybean sprouts was there some evidence of the presence of Listeria grayi. Furthermore, S. aureus was not detected in the studied sprouts. Some incidental contamination with Bacillus cereus was also observed, especially in the fresh and stored control soybean sprouts.

The amount of aerobic mesophilic bacteria determined in the study was comparable with the results shown by Abadias, Usall, Anguera, Solsona, & Viñas [37]. In this study, sprouts were analyzed in 2005–2006. The bacterial count ranged between 7 and 8 log CFU/g in about 60% of the samples and was higher than 8 log CFU/g in 40%. On the other hand, the total microbial counts determined for lentils and mung sprouts obtained in an automatic sprouting system by Pao, Khalid, & Kalantari [38] were lower, i.e. 7.5 and 6.9 log CFU/g, respectively. There were smaller numbers of yeasts and molds than the count of bacteria, but in this study their amount was significantly lower than those detected (5.2 log CFU/g) in 15 different sprouts samples [37]. The concentrations of presumptive B. cereus in the lentil and mung bean sprouts detected in this study was comparable with those reported in the study by Pao et al. [38]. Similar to the other studies, the sprouts in this study were free from pathogenic microorganisms, e.g., L. monocytogenes or Y. enterocolitica [39], [40]. Generally, the microbiota of sprouted food is mainly influenced by organisms originally present inside and on seeds used for germination [41]. Seeds are usually disinfected but reduction in epiphytic microflora may result in an increase in the potential growth of pathogens [19]. In this study, Lb. plantarum replaced the natural microflora of sprouts and thus reduced the growth of the bacteria. Lactic acid bacteria naturally occur in sprouts but their count is usually less than 5 log CFU/g [37]. As observed in this study, the LAB count in the sprouts enriched with the probiotic ranged from 7.61 log CFU/g to 9.68 log CFU/g. Most importantly, an increase in LAB during storage was observed, which may suggest that sprouts provide important nutrients (free sugars and amino acids) [42], and sufficient water in the matrix [43]. A key role in this phenomenon is probably played by ecological competition. On the other hand antagonistic action of Lb. plantarum is well described and involves also production of bacteriocins and hydrogen peroxide [11]. To support this hypothesis, the antagonistic properties of Lb. plantarum 299V were determined against food-borne pathogens isolated from low-processed food (Fig 2).

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Fig 2. Antagonistic effect of Lb. plantarum against selected food-borne pathogens isolated from low-processed food.

Means followed by different letters are significantly different (n = 9; p≤ 0.05).


https://doi.org/10.1371/journal.pone.0207793.g002

Lb. plantarum 299V showed high antagonistic activity toward L. monocytogenes and B. cereus strains; they were also able to reduce the growth of studied E. coli and Salmonella spp. The studied strain was less effective toward S. aureus. The potential of Lb. plantarum to prevent spoilage of dairy products, fresh fruits, and vegetables was previously reported by Ołdak et al. [11] and Trias, Bañeras, Montesinos, & Badosa [44].

The antagonistic effect of LAB against L. monocytogenes in sprout cultivation was studied by Palmai & Buchanan [36]. When Lactococcus lactis was coinoculated onto seeds at the beginning of the sprouting process, the maximum levels of L. monocytogenes were approximately 1 log lower than those observed in the control cultures.

The probiotic Lb. plantarum 299V strain is able to grow effectively in legume sprouts, which also ensures their high microbiological quality. To check if such formulations meet the requirements set for probiotics, bacterial survival during simulated in vitro digestion was studied (Fig 3).

The results showed a percent change in the probiotic count in the fluids after the process. The best protective properties were exhibited by the lentil sprouts, where the reduction of the initial population of LAB in the fresh and stored sprouts did not exceed 10%. A similar observation was found for the fresh soybean and mung bean sprouts; however, in the stored probiotic-rich sprouts, there was a decrease up to about 50% in the mung bean sprouts. In the case of the preparations based on adzuki bean, except for the high initial count of LAB, their content in the fluids after digestion was significantly decreased, i.e. by 63% and 54% in the fresh and stored probiotic-rich sprouts, respectively.

Many different alternative matrices have been studied as probiotic carriers but only some studies determined the effect of the digestive tract conditions on the final probiotic count. Generally, Lb. plantarum is resistant to mucin, low gastric pH, and bile salts [3]. In the study of Emser et al. [6], after a quick digestion of apple cubes dehydrated in a sucrose solution there was a slight decrease in Lb. plantarum, with log reductions below 1 log unit. The results obtained in this study for the lentil-based preparations are comparable with those obtained for microencapsulated Lb. plantarum, where a cell reduction of about 1 log unit was observed after digestion [45]. It is suggested that legume sugars are able to make niches that limit harmful conditions and/or free sugars change the osmotic potential locally, as reported previously [45].

Conclusions

In conclusion, legume sprouts and Lb. plantarum 299V can be successfully combined to form a new probiotic-rich food. The key factors influencing the production of probiotic-rich sprouts include the temperature of sprouting (25°C) and methods of inoculation (soaking seeds in a water suspension of probiotics). Most importantly, Lb. plantarum 299V significantly improved the microbiological quality of sprouts, replacing natural endophytes with lactic bacteria. The population of Lb. plantarum 299V was also stable during cold storage. The high count of lactic bacteria observed in the digest confirmed the fact that studied sprouts are effective carriers for probiotics and ensure their survival in harmful conditions of the digestive tract. Enrichment of legume sprouts with probiotics is a successful attempt and yields products for a new branch of functional foods.

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