Int J Curr Pharm Res, Vol 9, Issue 2, 26-30Original Article



Department of Microbiology, Fergusson College Pune 411004

Received: 28 Jul 2016, Revised and Accepted: 10 Oct 2016


Objective: Probiotics are defined as live microorganisms that provide beneficial effects on human health by improving the balance of intestinal micro flora. Comparative evaluation of 10 (LB1-LB10) commercial probiotic preparations (available in and around Pune) was carried out on the basis of physical parameters, standard plate count (SPC), antibiotic sensitivity and antimicrobial production.

Methods: Effect of temperature, pH and bile tolerance of samples was carried out on de Man, Rogosa and Sharpe (MRS) medium and growth were determined by counting colony forming the unit (cfu) value of appropriate dilution after 24 h and 48 h. Antibiotic sensitivity was carried out by disc diffusion assay. Antimicrobial activity was tested using Escherichia coli, Staphylococcus aureus, Bacillus sp. and Klebsiella sp. by in vitro agar well diffusion method.

Results: All the 10 samples showed aggregation for SAT (Salt Aggregation Test) at 0.2M ammonium sulphate concentration. It was observed that LB8, LB9 and LB10 were found to be the most promising probiotic product with respect to physical parameters. LB9 was found to be more antibiotic resistant as compared to LB10 and LB8. Antibacterial production of LB9 was seen against all test organisms. Effects of all the 5 NSAIDs were checked and LB8 showed the resistance to all.

Conclusion: LB8 is the most effective probiotic product under adverse conditions followed by LB10 and LB9.

Keywords: Probiotics, Antibiotics, Bile salt, NSAIDs


Probiotics are live microorganisms which, when administered in adequate amounts, confer a health benefit on the host [1, 2]. These live microbes can be formulated into many different types of products, including foods, drugs, and dietary supplements. Most of the probiotic species belong to genera, Lactic acid bacteria (LAB, (Bacteroides, Clostridium, Fusobacterium Eubacterium, Ruminococcus, Peptococcus, Peptostreptococcus, and Bifidobacterium but the yeast (Saccharomyces cerevisiae) and some E. coli and Bacillus species are also used as probiotics. Ideal probiotic strains have special properties such as resistance to bile, hydrochloric acid, and pancreatic juice; the ability to tolerate stomach and duodenum conditions and gastric transport; stimulation of the immune system, thereby improving intestinal function via adhering and colonising the intestinal epithelium. In addition, probiotic strains competed with pathogens and modulated permeability, produced lactic acid, and exhibited anti-carcinogenic and anti-pathogenic activity [3]. These bacteria showed a symbiotic relationship with humans, by inhibiting the growth and attachment of harmful bacteria by producing bactericidal chemicals against them in the mucous membrane of gut epithelial cells. With the development of evidence regarding usefulness and safety of probiotics, these bacteria are replacing the traditional prophylactic and treatment regimes. The present target of any probiotic food product in terms of probiotic cell numbers is to have up to 107 colony-forming units (CFU)/g at the end of its shelf life.

Probiotics are used to assist the body’s naturally occurring gut microbiota. Some probiotic preparations have been used to prevent diarrhoea caused by antibiotics, Studies have demonstrated probiotic effects on a variety of gastrointestinal and other disorders, including inflammatory bowel disease (IBD), irritable bowel syndrome (IBS), vaginal infections, and immune enhancement [2]. The probiotic beneficial effect for the host includes suppression of growth of pathogens, control of serum cholesterol level, modulation of the immune system, improvement of lactose digestion, synthesis of vitamins, increase in bio-availability of minerals and possible anti-carcinogenic activity.[4] Some probiotics have also been investigated in relation to atopic eczema, rheumatoid arthritis, and liver cirrhosis. Bacteriocins producing Lactic acid bacteria may also present a probiotic potential if capable of surviving the harsh conditions in the gastro-intestinal tract (GIT), including low pH and high concentrations of bile salts. Aggregation of LAB is an important feature in the evaluation of potential probiotic properties. While auto-aggregation may result in biofilm formation, co-aggregation with pathogens is important for elimination of non-desirable strains from the GIT. Another property which needs to be investigated for the probiotic potential of lactic acid bacteria is their antibiotic resistance. It is important to check for antibiotic resistance as they can act as potential reservoirs of resistance genes that can be transferred to other microorganisms, producing multidrug resistant strains [5].

Validation of probiotic contents in commercial products is needed to ensure consumer confidence. The term “probiotic” should be used only for products that meet the scientific criteria for this term—namely, products that contain an adequate dose of live microbes that have been documented in target-host studies to confer a health benefit [6].

The most common forms for probiotics are dairy products and probiotic-fortified foods. However, they are also available in tablets, capsules, and sachets containing the bacteria in freeze-dried form. The dose needed for probiotics varies greatly depending on the strain and product. Although many over-the-counter products deliver in the range of 1–10 billion cfu/dose, some products have been shown to be effective at lower levels, while some require substantially more. The global market for probiotics is estimated to exceed US$28.8 billion by 2016.

On 24th August 2007, the FDA issued rules that require current GMP for dietary supplements. Although these regulations do not address verification of efficacy claims, hopefully, they will improve the compositional quality (identity, purity, and strength) of probiotic supplements in the market [7]. But unfortunately, assessment of these products is limited by the lack of independent technical expertise and the expense of setting up the infrastructure to do such testing. Therefore, products are currently not subjected to stringent scrutiny; the manufacturers’ claims are difficult to validate, and the regulatory body has no mechanism to do post-marketing surveillance. Standardising such evaluation with a validated method would provide a means to assess and compare products, confirm their contents and monitor the effect of storage on their shelf life.

In this paper Comparative evaluation of 10 (LB1-LB10) commercially available probiotic products (around Pune, Maharashtra, India) was carried out. The activity was checked on the basis of physical parameters such as standard plate count (SPC), Antibiotic sensitivity, Antimicrobial production, Acid and Bile tolerance, Effect of Temperature, Salt Aggregation Test (SAT) and Effect of Nonsteroidal anti-inflammatory drugs (NSAIDs).


All the products were purchased from the chemists in and around Pune, Maharashtra, India. All the media used in this study were manufactured by Hi Media, India.

Collection and maintenance of probiotic samples:

Probiotic samples were collected on the basis of their availability and sale in the market. Ten samples were chosen for the experiment. Samples (LB1-LB10) were taken and enriched in the De Man Rogosa Sharpe’s (MRS) broth and incubated at 37 ° C for 24 h.

Table 1: Commercially available probiotics products samples

Sample number Organisms Claimed by manufacturer
LB1 Lactobacillus acidophilus-0.5 billion, Lactobacillus rhamnosus-0.5 billion, Bifidobacterium bifidum-0.5 billion, Bifidobacterium longum-0.5 billion, Streptococcus thermophillus–0.25 billion, Saccharomyces boulardii–0.25 billion,
LB2 Bifidobacterium longum–150 million, Lactobacillus acidophilus–350 million, Lactobacillus casei–350 million, Variety Rhamnosus–150million, Streptococcus thermophillus–200 million, Lactobacillus rhamnosus-200 million
LB3 Lactic acid bacteria strain 10 9 spores cfu/ml
LB4 Lactic Acid Bacillus–120 x 10 6spores
LB5 Bacillus mesentricus–1 million, Clostridium butyricum–2 million, Streptococcus faecalis–30 million, Lactobacillus sporogenes–50 million
LB6 Lactobacillus acidophilus–0.24 billion, Bifidobacterium bifidum–0.24 billion, Bifidobacterium longum–0.24 billion, Lactobacillus rhamnosus–0.24 billion, Saccharomyces boulardii–0.05 billion, Streptococcus thermophillus-0.24 billion
LB7 Bifidobacterium longum–5 billion cfu, Streptococcus thermophillus–5 billion cfu, Lactobacillus acidophilus–2.5 billion cfu, Lactobacillus sporogenes–2.5 billion cfu, Total count–15 billion cfu
LB8 Lactobacillus sporogenes-2.5 billion cells, Lactobacillus acidophilus–2.5 billion cells, Lactobacillus rhamnosus–2.5 billion cells, Bifidobacterium bifidum–2.5 billion cells, Bifidobacterium longum–2.5 billion cells, Saccharomyces boulardii–2.5 billion cells
LB9 Streptococcus faecalis–30 million spores, Clostridium butyricum–2 million spores, Bacillus mesentricus–1 million spores, Lactobacillus sporogenes–50 million spores
LB10 Lactobacillus casei strain, Shirota–6.5 billion per 65 ml bottle (conc. Of 10 8 cfu/ml(
  • Effect of temperature

The media used to study this parameter was MRS agar plates. Temperature tolerance of all samples was tested by inoculating overnight grown samples on MRS agar and incubating at 27 °C, 37 °C and 45 °C for 24 h. The growth of samples was monitored by counting cfu/ml.

  • Bile tolerance

To determine bile salt tolerance samples LB 1 to LB 10 were grown overnight in MRS broth. Sufficient cell suspension to give 10 6 CFU/ml concentration of each isolate was added into 10 ml of fresh MRS media containing 1%,2% and 3% of bile salts. The broths were incubated for 24 h and cell viability was determined by serial dilution and plating onto MRS agar after 24 h incubation.

  • Acid tolerance

MRS agar plates and broth with different pH values were used in this study. Samples LB1 to LB 10 were added to MRS broth adjusted to pH 1, 2 and 3 by using 0.1 N HCl. The initial bacterial concentration was 106 CFU/ml. The broths were incubated for 24 h at 37 ° C and cell viability was determined by serial dilution and plating onto MRS agar.

  • Antibiotic sensitivity

MRS (De Mann Rogosa Sharpe’s medium, Hi-media) Agar Antibiotics dodeca discs (Hi-Media, India) were used in this study. A disc diffusion assay was performed to study the antibiotic sensitivity of the samples (LB1-LB10). The samples were spread over the MRS agar plate. The antibiotics were supplied in the form of dodeca discs (Hi-Media, India) which included Cefpodoxime (CPD), Chloramphenicol (C), Vancomycin (VA), Streptomycin (S), Rifampicin (RIF), Levofloxacin (LE), Ceftriaxone (CTR), Clindamycin (CD), Augmentin (AMC), Amikacin (AK), Cefixime (CFM), and Tetracycline (TE). The zones of inhibition were recorded after incubation at 37 °C for 24 h.

  • Antimicrobial activity

The samples were cultured in MRS broth overnight and the pathogens were grown in nutrient broth. 200 µl of the test pathogens were spread onto the surface of Mueller-Hinton agar plates. Wells were punctured into the media. 100 µl of CFS (cell-free supernatant) obtained by centrifugation of the culture at 10,000 rpm for 5 min using Kubota centrifuge and pH adjusted between 6 and 6.4 was added into the wells. The plates were left in side the refrigerator for 30 min and then incubated at 37 °C for 24 h. The antimicrobial activity of the lactobacilli was determined in terms of the development of inhibition zones around the wells. The pathogens tested included Escherichia coli, Staphylococcus aureus, Klebsiella species (clinical isolates procured from local pathology laboratory) and Bacillus species (College laboratory isolate, isolated from soil).

  • Effect of NSAIDs

Following Non-Steroidal Anti-inflammatory drugs (NSAIDs) with different concentrations were used in the study.

Table 2: Different NSAIDS and their concentrations used in the study

NSAIDs Concentration
Aceclofenac 100 mg
Paracetamol 500 mg
Nimesulide 100 mg
Ibuprofen 400 mg
Aspirin 75 mg

Effect of various NSAIDs on the growth of probiotic samples was tested using agar well diffusion assay. Probiotic samples were grown in MRS broth overnight at 37 °C and spread on MRS agar. Various concentrations of NSAIDs dissolved in an appropriate solvent was added to wells and the plates were left inside the refrigerator for 30 min and then incubated at 37 °C for 24 h. and zone of inhibition was recorded. The control well-containing solvent was also present on MRS agar plate.

  • Salt aggregation test (SAT)

MRS broth containing Bacterial cells, Phosphate buffered saline (PBS) were used to study this parameter. Ammonium sulphate Solutions with different molarities (0.2–4.0) mol/l concentration of ammonium sulphate (M) giving aggregation the hydrophobic characteristic of the bacterial strains was determined according to the method reported by Johnson P. and Wadstrom T., (1984). Samples were grown in 10 ml of MRS broth at 37 °C for 16 h. Bacterial cells were harvested by centrifugation (3000 g for 15 min), washed twice with phosphate-buffered saline (PBS) pH 7 and suspended in PBS at a concentration of 107 cells/ml. Bacterial cell suspensions (25 μL) were mixed with equal volumes of ammonium sulphate of various molarities (0.2–4.0 mol/l) on microscopic glass slides. The lowest concentration of ammonium sulphate giving a visible aggregation was scored as the SAT hydrophobicity value.


All the commercially available probiotic samples were suspended in sterile distilled water and serially diluted up to 10-9. The colonies obtained on MRS agar plates were counted and the standard plate count of these samples is given in tabular form.

Table 3: SPC of the probiotics samples

Samples Standard plate contributions
10-6 10-7 10-8 10-9
LB 1 380 x 106 10 0x 107 40 x 108 10 x 109
LB 2 300 x 106 260 x 107 120 x 108 60 x 109
LB 3 120 x 106 84 x 107 36 x 108 13 x 109
LB 4 190 x 106 110 x 107 13 x 108 2 x 109
LB 5 210 x 106 40 x 107 18 x 108 8 x 109
LB 6 240x 106 130 x 107 16x108 7x109
LB 7 140 x106 96x107 46x108 11x109
LB 8 176x106 168x107 22x108 10x109
LB 9 280x106 180x107 60x108 32x109
LB 10 80x106 61x107 38x108 34x109
  • Effect of temperature

All the 10 (LB1-LB10) samples were able to grow at 27 °C, 37 °C while sample LB1, LB2, LB6, LB 8 and LB10 showed very little growth 45 °C. Considering the human body temperature and the optimum temperature obtained, all further experiments were carried out at 37 ° C. The colony forming units/ml are shown in the table for each isolate at three different temperatures.

Table 4: Effect of temperature on colony forming units of probiotics

Temp LB1 LB2 LB3 LB4 LB5 LB6 LB7 LB8 LB9 LB10
27 °C 101 101 104 104 103 101 102 103 103 104
37 ° C 103 102 104 104 103 102 103 104 104 104
45 ° C 101 101 104 103 103 101 103 101 104 101
  • Effect of bile

The probiotic cultures were exposed to various concentrations of bile salts (1%, 2% and 3%). At higher concentration of bile salt (3%) sample LB8 was found to be more bile tolerant followed by LB2, LB6 and LB9. The growth of organisms (LB 1 to LB 10) in terms of the optical density is shown in the table at different concentrations of bile salts.

Table 5: Effect of bile salt concentration on the growth of the probiotics organisms

Bile Conc . (%) LB1 LB2 LB3 LB4 LB5 LB6 LB7 LB8 LB9 LB10
1 0.4 0.8 0.4 0.1 0.4 0.4 0.1 0.8 0.1 0.4
2 0.1 0.4 0.3 0.4 0.5 0.5 0.8 0.9 0.2 0.2
3 0.2 0.5 0.5 0.5 0.5 0.1 0.4 0.8 0.1 0.1
  • Acid tolerance

The probiotic samples were exposed to different pH values (1,2 and 3). It was observed that all the probiotic samples could tolerate these pH values. At pH 1 sample 1,3,4,9,10 showed reductions in growth by 20 percent. At pH 3, all the cultures except 3 showed good growth. At pH 2 all the samples except 1 showed good growth.

Table 6: Effect of pH on the growth of probiotics organisms

pH LB1 LB2 LB3 LB4 LB5 LB6 LB7 LB8 LB9 LB10
1 0.1 0.4 0.2 0.2 0.4 0.4 0.4 0.8 0.1 0.1
2 0.1 0.4 0.8 0.8 0.8 0.8 0.7 0.7 0.2 0.2
3 0.2 0.5 0.1 0.4 0.9 0.7 0.8 0.8 0.4 0.3
  • Antibiotic sensitivity

All the 10 isolates were subjected to antibiotic susceptibility test. LB1 was found to be resistant to CD, CFM, VA and CPD and LB10 found to be resistant to VA, CPD and C while LB2 was sensitive to most of the antibiotics.

All the samples were resistant to CPD except sample 6 and 8.

Table 7: Antibiotic sensitivity pattern of the probiotics organisms

Antibiotics (symbols) Concentration( in mcg) Diameter of zone of inhibition (mm)
LB1 LB2 LB3 LB4 LB5 LB6 LB7 LB8 LB9 LB10
Amikacin(AK) 30 19 25 16 27 19 20 21 30 10 11
Augmentin(AMC) 30 9 8 6 18 15 30 22 33 16 20
Clindamycin(CD) 2 ND 22 30 25 20 25 ND 27 15 20
Ceftriaxone(CTR) 30 13 31 14 20 24 30 ND 12 20 23
Levofloxacin(LE) 5 35 32 10 38 40 30 34 30 24 15
Rifampicin(RIF) 5 13 27 15 25 21 25 40 30 14 14
Tetracycline(TE) 30 15 27 20 26 28 32 24 25 24 23
Cefixime(CFM) 5 ND 11 ND ND ND 20 22 30 ND 21
Vancomycin(VA) 30 ND 20 6 21 23 12 13 25 20 ND
Chloramphenicol(C) 30 17 35 28 27 24 9 41 25 35 ND
Cefpodoxime(CPD) 10 ND ND ND ND ND 12 ND 22 ND ND
Streptomycin(S) 10 21 29 18 26 30 ND 24 ND 10 15

ND: No zone of inhibition detected

Table 8: Antibacterial activity of the probiotic organisms against indicator organisms

Isolates Test organisms diameter of zone of inhibition in mm
Bacillus spp. Staphylococcus aureus E. coli Klebsiella spp.
LB 1 ND 11 ND ND
LB 3 ND ND 6 4
LB 5 ND 4 ND 4
LB 6 ND ND 4 7
LB 7 ND 4 11 8
LB 8 ND 13 ND ND
LB 9 8 10 7 12
LB 10 11 15 ND 12

ND: No zone of inhibition detected

  • Antimicrobial activity

Antibacterial production by LB9 was seen against all the test organisms used in the study.

  • Effect of NSAIDs

When five different Non-steroidal anti-inflammatory drugs were tested against probiotic samples, it was observed that all these samples are sensitive to anti-inflammatory compounds and showed a zone of inhibition in the presence of them. Sample LB 8, LB 9 and LB 10 were found to be resistant to these drugs as the zone of inhibition was not observed in these plates.

  • Salt aggregation test

All the samples undergone SAT (Salt Aggregation Test) to check hydrophobicity and at 0.2M ammonium sulphate concentration.

All the isolates except LB 2 and LB 6 showed aggregation.

Table 9: Effect of different NSAIDs on the probiotic organisms

Probiotic Samples Effect of non-steroidal anti-inflammatory drugs (NSAIDs)
Aceclofenac Paracetamol Nimesulide Ibuprofen Aspirin
LB1 + + + + +
LB2 + + + + +
LB3 + + + + +
LB4 + + + + +
LB5 + + + + +
LB6 + + + + +
LB7 + + + + +
LB8 - - - - -
LB9 - - - - -
LB10 - - - - -

“+” = Zone of inhibition, “-” = No zone of inhibition

Table 10: Salt aggregation test of the probiotic organisms

Concentration of ammonium sulphate (M) Concentration of ammonium sulphate giving aggregation
LB 1 LB 2 LB 3 LB 4 LB 5 LB 6 LB 7 LB 8 LB 9 LB 10
0.2 + - +++ ++ + - ++ ++ + ++
0.3 + - +++ ++ + - ++ +++ + ++
0.4 - - +++ +++ ++ - - +++ + ++
0.5 + - +++ ++ ++ - ++ +++ - -


The ability of probiotic bacteria to survive the harsh environments encountered during processing and gastrointestinal transit has been a major factor in their selection criteria. Probiotics are mostly delivered in a food system and must be tolerant to harsh conditions to confer its full effect. Considering the significant rise in the annual consumption of probiotic products, it is important that such products are well-documented and regarding safe and functional [8]. In this comparative study profile of probiotic bacteria isolated from different commercial probiotic products was done. Firstly, ten (LB1-LB10) probiotic samples were procured. They were subjected to screening for potential probiotic abilities. All the samples were able to survive the low pH (pH 1, pH 2 and pH 3) conditions but at pH 2 most of the probiotic bacteria showed viability and activity. However, at pH 1 viability of the probiotic bacteria was low as compared to pH 2 and pH 3. In similar studies, it was found that probiotic bacteria were able to survive low pH conditions. Bile tolerance was observed by selecting a range of bile concentration (1%, 2% and 3%). All the isolates were tolerant to the bile concentration, however, higher tolerance was observed at 1% bile concentration and with an increase in the bile salt concentration, growth of probiotic bacteria decreases. In most of the studies, it was observed that at 0.3% bile salt concentration maximum tolerance of probiotic bacteria was observed. Regarding antibiotic sensitivity, most of the samples showed resistance towards Clindamycin (CD), Cefpodoxime (CPD) and Cefixime (CFM). LB1 and LB10 showed resistance against Vancomycin (VA) and Cefpodoxime (CPD). All the 10 samples were sensitive to Tetracycline (TE), Rifampicin (RIF), Chloramphenicol (C) and Levofloxacin (LE). LB2 was found sensitive to most of the antibiotics. In previous studies, it was shown that most of the probiotic bacteria are sensitive to Chloramphenicol (C) and Ampicillin. According to antimicrobial activity, most of the probiotic bacteria showed antimicrobial activity against Staphylococcus aureus and weak inhibition was shown against Bacillus sp. In previous studies, it was reported that probiotic bacteria show antimicrobial activity against S. aureus [9]. From this study, it was observed that LB9 showed antimicrobial activity against all the pathogenic bacteria used in this study. Hydrophobicity by using SAT (Salt Aggregation Test) was reported by many studies [9] and in this study, all the 10 samples (LB1-LB10) showed aggregation at 0.2 M Ammonium sulphate and except LB2 and LB6 all the other 8 samples showed aggregation at a various range of ammonium sulphate concentration (0.3-0.5M). Effects of five different NSAIDs were checked against all the ten (LB1-LB10) samples. LB8, LB9 and LB 10 were resistant to Aceclofenac, Paracetamol, Nimesulide, Ibuprofen and Aspirin and remaining all the samples showed susceptibility to all the different NSAIDs used in this study. LB8 was most resistant to Aspirin and Nimesulide. In previous studies it was shown that most of the probiotic bacteria were resistant to Aspirin, Aceclofenac and Nimesulide and result of this study correlate with the previously reported work [9].

Probiotic microorganisms act through several interrelated mechanisms to promote health at the molecular level [10]. The health benefits of probiotics have always been investigated with regard to their capability to sustain their availability, viability, digestibility, and rendering of their health benefits to the host. They conquer potentially dangerous micro-organisms in the intestine, reducing the risk of infection or toxin-mediated diseases. Moreover, our expectations of probiotic bacteria have perhaps become the most demanding for any bacterial group to date. Probiotics are available to consumers mainly in the form of foods and as dietary supplements. Additionally, the products have been introduced to healthcare professionals with a variety of therapeutic claims for health and benefit, often with extrapolated clinical evidence of efficacy. In conclusion of this work, it was found that probiotic sample 8 was superior probiotic amongst 10 tested samples followed by LB 10 and LB 9.


All authors have none to declare


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How to cite this article

  • Suneeti Gore, Anjali Paul, Yashada Bhagwat. Comparative evaluation of commercially available probiotics products. Int J Curr Pharm Res 2017;9(2):26-30.

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Probiotics, Antibiotics, Bile salt, NSAIDs





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International Journal of Current Pharmaceutical Research
Vol 9, Issue 2, 2017 Page: 26-30

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Authors & Affiliations

Suneeti Gore
Department of Microbiology, Fergusson College Pune 411004

Anjali Paul

Yashada Bhagwat


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