Cited by 2Food Safety and HygieneCoconut Research and ApplicationsFecal contamination and water quality

Microbiological analysis of coconut water (Cocos nucifera L.) sold by street vendors in Sobral/CE, Brazil

Open access
Coutinho, Maria Gleiciane Soares, Neves, Andréa Maria, Souza, Francisco Fábio Pereira de, Batista, Ana Sancha Malveira, Fontenelle, Raquel Oliveira dos Santos·2024·Interfaces Científicas - Saúde e Ambiente

Abstract

Green coconut water is rich in nutrients and widely consumed in the world. However, the consumption of coconut water out of good practices for food production treat consumer health. The aim of this work was to evaluate the microbiological quality of coconut water sold by vendors street in Sobral - CE. Samples of fresh coconut water were collected bimonthly from four different points (named A, B, C and D) during 12 months (n=24). Samples were characterized by quantification of total coliform (TC), thermotolerant coliform (TTC) and mesophilic aerobic bacteria (MAB). The Most Probable Number (MPN) and Pour Plate techniques were applied to quantification of TC and TTC, and mesophilic aerobic bacteria (MAB), respectively. All samples presented contamination by TC, TTC and MAB. TC-MPN ranged from 4.97x104 MPN/mL to 1.18x105 MPN/mL, and TTC-MPN ranged from 8.39x102 MPN/mL to 1.28x103 to MPN/mL. Samples C and D presented contamination by Escherichia coli. The number of MAB ranged from 3.12x104 CFU/mL to 6.73x104 CFU/mL. TTC number are above of the permitted values according to National Health Surveillance Agency (ANVISA), being considered as unsuitable for human consumption. Then, it is necessary to adopt preventive measures and good hygiene practices in coconut water commercialization for improvement of the microbiological quality of the product and prevent risks to consumers health.

AI snapshot

Written from the paper’s full text.

TL;DR

This study evaluated the microbiological quality of fresh coconut water sold by four street vendors in Sobral, Ceará, Brazil, over 12 months (n=24). All samples were contaminated with total coliforms, thermotolerant coliforms, and mesophilic aerobic bacteria, with thermotolerant coliforms exceeding the Brazilian limit and indicating unsuitability for human consumption.

Key findings

  • 100% (24/24) of samples were contaminated by total coliforms; total coliform MPN ranged from 4.97×10⁴ to 1.18×10⁵ MPN/mL, with no statistical difference among vendors (p>0.05).
  • 100% (24/24) of samples were contaminated by thermotolerant coliforms; TTC MPN ranged from 8.39×10² to 1.28×10³ MPN/mL, above the RDC No. 12/2001 tolerance of up to 100 MPN/mL, so samples were considered unfit for consumption.
  • Mesophilic aerobic bacteria were present in all samples; the abstract reports MAB from 3.12×10⁴ to 6.73×10⁴ CFU/mL, while the results text reports 2.0×10² to 9.4×10⁴ CFU/mL. *Escherichia coli* was found in samples from vendors C and D.
  • Of 133 Enterobacteriaceae strains identified, the most frequent were *Serratia liquefaciens* 45 (33.8%), *Klebsiella pneumoniae* 26 (19.5%), *Enterobacter* sp. 16 (12.0%), and *Escherichia coli* 4 (3%).

Methods

  • Fresh green coconut water samples (200 mL each) were collected bimonthly from four street vendors (A, B, C, and D) in central Sobral, Ceará, from 2021 to 2022, totaling 24 samples; samples were transported in isothermal boxes to the Microbiology Laboratory at Universidade Estadual Vale do Acaraú (UVA).
  • Total and thermotolerant coliforms were quantified by the Most Probable Number (MPN) multiple-tube technique; mesophilic aerobic bacteria were quantified by standard plate count/Pour Plate on Plate Count Agar; *E. coli* was isolated on Eosin Blue Methylene Agar and Tryptic Soy Agar, then submitted to IMVIC biochemical tests.
  • Results were interpreted according to Resolution RDC No. 12/2001 (tolerance up to 100 MPN/mL thermotolerant coliforms); averages were compared by Tukey test at 5% probability using SAS.

Limitations

  • Not stated in the paper.
  • Evident from the text: sampling was limited to four street vendors in one city and 24 samples, so findings may not generalize to other vendors or regions.
  • Evident from the text: although *Salmonella* is mentioned as a foodborne risk, the study did not test for *Salmonella*; rain/temperature explanations for monthly variation are suggested without controlled environmental or handling data.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.17564/2316-3798.2024v9n3p219-231

Cites

18 of 18 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

5 of 25 cited sources checked · 0 supported · 0 flagged · accuracy not yet measured

  • Findingown data

    All analyzed coconut water samples were contaminated by mesophilic aerobic bacteria.

    “All samples presented contamination by TC, TTC and MAB.”
    • Also stated in: § 3 RESULTS AND DISCUSSION · plain
      “The presence of mesophilic aerobic bacteria was also verified in all analyzed samples.”
    Quote in the paperSubstantial claim
  • Findingown data

    There was a significant difference (p<0.05) in mesophilic aerobic bacteria counts between January (9.07x10^4 CFU/mL), March (9.10x10^4 CFU/mL), May (2.00x10^4 CFU/mL), and November (8.10x10^3 CFU/mL).

    “there was a significant difference (p<0.05) for the presence of mesophilic aerobic bacteria, between January 9.07x10 4 CFU/mL, march 9.10x10 4 CFU/mL, may 2.00x10 4 CFU/mL and November 8.10x10 3 CFU /mL.”
    Quote in the paperSubstantial claim
  • Findingown data

    Samples C and D presented contamination by Escherichia coli.

    “Samples C and D presented contamination by Escherichia coli.”
    • Also stated in: § 3 RESULTS AND DISCUSSION · plain
      “The presence of E. coli was confirmed by carrying out biochemical tests, showing a positive result in some samples of coconut water.”
    Quote in the paperNot a substantial claim
  • Findingreasoning

    The vast majority of carts do not have a potable water system for cleaning equipment and utensils or for the seller's personal hygiene, resulting in product contamination.

    “the vast majority of carts do not have a potable water system for cleaning the equipment and utensils used, as well as the personal hygiene of the seller, resulting in product contamination.”
    Quote in the paperSubstantial claim
  • Findingown data

    All 24 coconut water samples were contaminated by thermotolerant coliforms.

    “All samples presented contamination by TC, TTC and MAB.”
    • Also stated in: § 3 RESULTS AND DISCUSSION · plain
      “100% of the samples (24/24) showed MPN values ranging from 8.39x10 2 MPN/mL to 1.28x10 3 MPN/mL”
    Quote in the paperSubstantial claim
  • May combine two claims. 16
  • Classified as probably not a substantial claim. 14
  • The quote only partly states this claim. 1
  • May combine two claims.

    Interpretationcitation

    The high number of total coliforms indicates deficient hygienic-sanitary practices at the place of sale, machinery/utensils, and non-adoption of good practices by the handler.

    “the low microbiological quality of the analyzed samples presented by the high number of total coliforms indicate deficient hygienic-sanitary practices at the place of sale, of the machinery and utensils used for the commercialization, opening and manipulation of the coconut, as well as the non-adoption of the good practices by the handler for handling the product”
    Quote in the paperSubstantial claim2 of 3 sources checked
    • cites Valiatti et al., 2017 source

      The Discussion (page unavailable in our copy) says total coliforms indicate hygienic-sanitary conditions and links contamination in ground beef to possible hygiene failures at the processing site or among handlers. It also identifies inadequate cleaning of equipment and utensils as a possible factor in contaminated raw milk. The paper studies beef, milk, and cheese—not coconut—and does not establish that poor practices at a coconut point of sale or non-adoption of good practices by its handler caused the citing paper’s results. (LLM, conf=0.87)

      Experimental — accuracy not yet measured
    • cites Fernandes et al., 2019 source

      The Análises Microbiológicas section (page not provided) says high total-coliform counts indicate contamination in the sampled Jaguaribe River water. It does not connect those counts to coconut sales, contaminated machinery or utensils, or a handler’s failure to follow good practices. (LLM, conf=0.84)

      Experimental — accuracy not yet measured
    • cites Silva et al., 2021a

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    Poor equipment and utensils hygiene, and nutritional changes caused by chemical contaminants influence the low quality of the product.

    “In addition, poor of equipment and utensils hygiene, and nutritional changes caused by chemical contaminants influence the low quality of the product (Silva et al., 2017;Silva et al., 2018).”
    Quote in the paperNot a substantial claim1 of 2 sources checked
    • cites Silva et al., 2017 source
    • cites Silva et al., 2018 source

      The Resumo (page not available) reports contamination in 30% of coconut-water samples and suggests it may be related to inadequate cleaning of vendors’ work utensils. It does not address nutritional changes caused by chemical contaminants, and it does not establish equipment hygiene as a cause. (LLM, conf=0.86)

      Experimental — accuracy not yet measured
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    Klebsiella, Escherichia, Yersinia and Citrobacter are pathogens harmful to health, etiological agents responsible for numerous infections in humans and animals.

    “Other genera of great clinical importance, such as Klebsiella, Escherichia, Yersinia and Citrobacter, are also pathogens harmful to health, as they are etiological agents of great occurrence, being responsible for numerous infections in humans and also in animals”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites Albuquerque et al., 2020 source

      The Introduction (page not provided) identifies Klebsiella pneumoniae and Yersinia sp. among bacteria that may cause serious opportunistic infections in humans. The Discussion (page not provided) says K. pneumoniae and E. coli can cause opportunistic infections. The copy does not establish that all four named genera commonly cause numerous infections in both humans and animals; it does not address Citrobacter. (LLM, conf=0.85)

      Experimental — accuracy not yet measured
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductcitation

    The study's microbiological analyses were performed according to the Compendium of Methods for the Microbiological Examination of Foods of the American Public Health Association and the Manual of Methods for Microbiological Analysis of Foods.

    “All microbiological analyzes were performed according to the Compendium of Methods for the Microbiological Examination of Foods of the American Public Health Association (Downes;Ito, 2001) and the Manual of Methods for Microbiological Analysis of Foods (Silva et al., 2010).”
    Quote in the paperNot a substantial claim1 of 2 sources checked
    • cites Downes;Ito, 2001

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites Silva et al., 2010 source

      Section 2.2.2 (page unavailable) says the paper used a method recommended by Silva (2007) for Salmonella detection, and its References identify that work as a microbiological-analysis manual. It does not say that all analyses followed the manual or the APHA Compendium. (LLM, conf=0.83)

      Experimental — accuracy not yet measured
  • May combine two claims.

    Findingreasoning

    Thermotolerant coliform MPN values by month showed a significant difference (p<0.05), with values of 5.65x10 MPN/mL in May and 1.66x10^3 MPN/mL in September.

    “there was a significant difference (p<0.05) in relation to the presence of microorganisms, with values of 5.65x10 MPN/mL in May and 1.66x10 3 MPN/mL in September”
    Quote in the paperSubstantial claim
  • The quote only partly states this claim.

    Findingown data

    There was no statistical difference (p>0.05) in total coliform MPN between the four points studied.

    “with no statistical difference (0.05> p) between the studied samples.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    The 133 strains isolated comprised 45 (33.8%) Serratia liquefaciens, 26 (19.5%) Klebsiella pneumonia, 16 (12.0%) Enterobacter sp, 10 (7.5%) Serratia marcesens, 10 (7.5%) Yersinia enterocolitica, 9 (7%) Proteus mirabllis, 6 (4.5%) Hafnia alvei, 4 (3%) Escherichia coli, 4 (3%) Providencia alcalifaciens and 3 (2.2%) Citrobacter freundii.

    “Of the 133 strains isolated from coconut water (100%), 45 (33.8%) refer to Serratia Iiquefaciens, 26 (19.5%)Klebsiella pneumonia, 16 (12.0%)Enterobacter sp, 10 (7,5%) Serratia marcesens, 10 (7.5%) Yersinia enterocolitica, 9 (7%) Proteus mirabllis, 6 (4.5%) Hafnia alvei, 4 (3%) Escherichia coli, 4 (3%) Providencia alcalifaciens and 3 (2.2%)Citrobacter freundii.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Of the 24 samples analyzed, 133 bacterial strains were identified, all belonging to the Enterobacteriaceae family.

    “Of the twenty-four samples analyzed, 133 bacterial strains were identified, all belonging to the Enterobacteriaceae family.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Aerobic mesophilic bacteria grow at room temperature of 25 to 45°C, with an ideal temperature of 30°C.

    “Aerobic mesophilic bacteria grow at a room temperature of 25 to 45°C, with an ideal temperature change of 30°C (Tortora et al., 2012).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Tortora et al., 2012

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Interpretationown data

    All samples had total coliform contamination above the reference standard of 100 MPN/mL and were classified as unsatisfactory for human consumption.

    “all samples presented contaminations above the established standards, since the the level of contamination found in the analyzed samples was greater than 100 NMP/mL, being classified as unsatisfactory for human consumption.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S4 (based).

    Interpretationreasoning

    Street vendors are unaware of proper coconut handling and sanitation practices.

    “Observing the results presupposes that street vendors are unaware of proper coconut handling and sanitation practices.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    When present in high numbers in foods, mesophilic aerobic bacteria can cause deterioration and/or reduced shelf life.

    “when present in high numbers in foods, these agents can cause deterioration and/or reduced shelf life.”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites Fortuna;Fortuna, 2008

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites Silva et al., 2009

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Interpretationown data

    Thermotolerant coliform numbers in the samples were above the permitted values according to ANVISA (maximum 100 MPN/mL), making them unsuitable for human consumption.

    “TTC number are above of the permitted values according to National Health Surveillance Agency (ANVISA), being considered as unsuitable for human consumption.”
    • Also stated in: § 3 RESULTS AND DISCUSSION · plain
      “considered unfit for consumption in accordance with current Brazilian legislation, which recommends tolerable values of thermotolerant coliforms in food products, such as coconut water, maximum permitted tolerance of up to 100 MPN/mL (Brasil, 2001)”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Brasil, 2001

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Interpretationown data

    The high MAB values signal the use of contaminated materials for coconut cutting, inadequate processing, and inefficient storage by street vendors.

    “signaling the use of contaminated materials for coconut cutting, as well as inadequate processing and inefficient storage in terms of time and temperature performed by street vendors.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Rainfall was 98.6 mm in May and 0.0 mm in September.

    “There was rainfall of 98.6 mm in May, while in September 0.0 mm (FUNCEME, 2022).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites FUNCEME, 2022

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Interpretationown data

    All samples collected showed a high rate of contamination by total and thermotolerant coliforms, in addition to the presence of mesophilic aerobic bacteria, indicating disagreement with current legislation.

    “Based on the results obtained from the microbiological analysis of coconut water, it was concluded that all the samples collected showed a high rate of contamination by total and thermotolerant coliforms, in addition to the presence of mesophilic aerobic bacteria, indicating that they are in disagreement with current elegislation.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationreasoning

    In January and March, when more rainfall was observed, the temperature was close to 30°C, thus increasing the proliferation of mesophilic aerobic bacteria.

    “In the months of January and march, when more rainfall was observed, the temperature was close to 30°C, thus increasing the proliferation of these microorganisms.”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim.

    Study design and conductreasoning

    The samples were transported in isothermal boxes with sanitized ice sheets to not compromise microbiological quality.

    “Afterwards, the samples were placed in isothermal boxes containing sanitized ice sheets in order not to compromise the microbiological quality of the samples”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    These pathogens are opportunistic and can be major causes of problems in debilitated patients once they find favorable conditions in the host.

    “these pathogens are also opportunistic beings, since, once they find favorable conditions in the host, they are major causes of problems in debilitated patients (Rios et al., 2020).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Rios et al., 2020

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Premisecitation

    The low cost and ease of handling of coconut in natura stimulates its marketing in outside locations, like sidewalks and street, which increases the risk of microbial contamination.

    “The low cost and ease of handling of coconut in natura also stimulates its marketing in outside locations, like sidewalks and street (Santos et al., 2013), which increase the risk of microbial contamination.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Santos et al., 2013

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Foods are considered an important vehicle for the transmission of microorganisms and diseases that can cause food outbreaks.

    “Foods are considered an important vehicle for the transmission of microorganisms and diseases that can cause food outbreaks.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Franz et al., 2018 source
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    Genera Serratia, Enterobacter, Hafnia, Providencia and Proteus are present in nature and also found in the intestinal flora of man and other warm-blooded animals.

    “The genera Serratia, Enterobacter, Hafnia, Providencia and Proteus are microorganisms present in nature, being also found in the intestinal flora of man and other warm-blooded animals.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Rios et al., 2020

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    The analyses were performed in duplicate.

    “The analyzes were performed in duplicate and the results expressed in CFU/mL.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    The data obtained from MPN for TC, TTC and MAB were subjected to analysis of average comparison by the Tukey test at 5% probability using SAS.

    “The data obtained from the NMP for CT, CTT and MAB were subjected to analysis of average comparison by the Tukey test at 5% probability, using the SAS statistical package.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    The main microorganisms that cause infections and/or toxinfections food are Escherichia coli, Campylobacter spp., Salmonella spp., and Shigella spp.

    “The main microorganisms that cause infections and/or toxinfections food are Escherichia coli, Campylobacter spp., Salmonella spp., and Shigella spp.(Franz et al., 2018).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Franz et al., 2018 source
  • Classified as probably not a substantial claim. May combine two claims.

    Study design and conductnone given

    The samples were kept in original packaging, sealed and without any possibility of external contamination.

    “After collection, the samples were kept in their original packaging, sealed and without any possibility of external contamination.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    The quality of ice used for conservation and deposited inside thermal reservoirs is a worrying factor.

    “Another worrying factor is the quality of the ice used for conservation and which is deposited inside thermal reservoirs (Froehlich, 2015).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Froehlich, 2015 source
27 of 27
  • The paper relies on this without support.

    Thermotolerant coliforms are indicators of fecal contamination.

    “ity, and their presence indicate contamination of fecal origin.”
  • The paper relies on this without support.

    Healthy coconut water inside the fruit is sterile.

    “Although being sterile inside of the healthy fruit, coconut water can be contaminated by microorganisms during the extraction process, transport and/or storage (Santos et al., 2018).”
  • The paper relies on this without support.

    Coconut water sold in external locations and by street vendors may ignore good food preparation, handling and storage practices.

    “The coconut water sold in external locations and by street vendors may ignore good food preparation, handling and storage practices.”
  • The paper relies on this without support.

    The four sampled street vendors are representative of coconut water sold by street vendors in Sobral/CE.

    “Samples of fresh green coconut water (200mL each) were obtained from four street vendors (A, B, C and D) in the center of Sobral, Ceará State.”
4 of 4

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Total-coliform significance inequality is reversed

    Minor

    The statement says there was no statistical difference but writes 0.05 > p, which denotes p < 0.05. Table 1 reports p = 0.0557, consistent with no difference and the opposite inequality.

1 of 1

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Authors
Coutinho, M. G. S., Neves, A. M., Souza, F. F. P. D., Batista, A. S. M., & Fontenelle, R. O. D. S.
Affiliations
  • State University of Vale do Acaraú (BR)
  • Universidade Federal do Ceará (BR)
Venue
Interfaces Científicas - Saúde e Ambiente
Published
2024-05-07
Volume
9
Issue
3
Pages
219-231
ISSN
  • 2316-3313 (ISSN-L)
  • 2316-3798
OpenAlex
W4401045692
Cited by
2
References
18
Citations by year
2026: 1 · 2024: 1
FWCI
0.39
Type
journal article
Language
en
Open access
Locations
  • Interfaces Científicas - Saúde e Ambiente (publishedVersion, cc-by-nc)
  • LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (submittedVersion, cc-by-nc)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Food Science › Food Safety and Hygiene
  • Physical Sciences › Chemistry › Inorganic Chemistry › Coconut Research and Applications
  • Physical Sciences › Environmental Science › Water Science and Technology › Fecal contamination and water quality
Keywords
coconut water, Cocos nucifera, microbiological quality, street vendors, food contamination, total coliforms, fecal coliforms, mesophilic aerobic bacteria, Escherichia coli, food safety, Sobral, Ceará

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