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Hi24™ Enterobacteriaceae Identification Kit, Modified

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KB016
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Intended use

KB016 is a standardized, colorimetric identification system, a combination of 24 tests for the identification of Enterobacteriaceae species (from clinical specimen and non clinical samples using pure isolate.

Kit Contains :

Each kit contains sufficient material to perform 5/10/20 tests. (Kit contains sterile medium in Strip1 for ONPG, Lysine utilization, Ornithine utilization, Urease detection, Phenylalanine deamination (TDA), Voges- Proskauer's, Methyl red, Indole, PYR, β-Glucuronidase, α-Galactosidase, β-Xylosidase and Strip 2 for Esculin hydrolysis and 11 different carbohydrates utilization test - Sucrose, Sorbitol, Trehalose, Glucose, Cellobiose, Melibiose, Salicin, Mannose, Maltose, Raffinose, Lactose)

  1. 5/10/20 kits of Part I.
  2. 5/10/20 kits of Part II.
  3. Technical product insert.
  4. Result Interpretation Chart and Result Entry Datasheet.
  5. Identification Index.
  6. TDA reagent (R036) for Phenylalanine Deaminase test.
  7. Baritt reagent A (R029) for Voges-Proskauer's test.
  8. Baritt reagent B (R030) for Voges-Proskauer's test.
  9. Methyl Red reagent (1007) for Methyl Red test
  10. Kovac's reagent (R008) for Indole test
  11. PYR Reagent (R043) for PYR test

Material Required but not supplied :

  1. McFarland standard
  2. Inoculation loops, pipettes
  3. Enrichment medium / Isolation media

Direction

Preparation of inoculum

  • KB016 cannot be used directly on clinical specimens. The organisms to be identified have to be first isolated and purified. Only pure cultures should be used. Isolate the organism to be identified on a common medium like Nutrient Agart (M001) or a differential medium like MacConkey Agar (M082).
  • Pick up a single isolated colony and inoculate in 5 ml BHI Broth (M210) and incubate at 35-37°C for 4-6 hours until the inoculum turbidity is 0.1 OD at 620nm or 0.5 McFarland standard. Some fastidious organisms may require more than 6 hours of incubation. In this case incubate till the inoculum turbidity reaches 0.1 OD at 620nm. Alternatively, prepare the inoculum by picking 1-3 well isolated colonies and make a homogenous suspension in 2-3ml sterile saline. The density of the suspension should be 0.1 OD at 620nm.
  • Note the result in the Result Entry Datasheet. Oxidase test must be performed as it is an integral part of the identification system. It must be performed to differentiate Enterobacteriaceae from other Gram negative rods.

Inoculation of the kit

  1. Open the kit aseptically. Peel off the sealing foil.
  2. Inoculate each well with 50 µl of the above inoculum by surface inoculation method.
  3. Alternatively, the kit can also be inoculated by stabbing each individual well with a loopful of inoculum

Incubation

Temperature of incubation: 35±2°C. Duration of incubation: 18-24 hours.

Interpretation of results :

Interpret results as per the standards given in the identification index. Addition of reagents in well no 5,-9 should be done at the end of incubation period that is after 18 -24 hours.

Principle

Each Hi24™ Enterobacteriaceae Identification Kit, Modified is a standardized colorimetric identification system utilizing ten conventional biochemical tests, 3 chromogenic substrate utilization test and eleven carbohydrate utilization tests. The tests are based on the principle of pH change and substrate utilization. On incubation organisms undergo metabolic changes which are indicated by a colour change in the media that is either visible spontaneously or after addition of a reagent.

Type of specimen

Pure isolate from clinical specimen and non clinical sample

Specimen collection and handling

Refer direction

Warning and Precautions :

In Vitro diagnostic Use. For professional use only. Read the label before opening the pack. Wear protective gloves/ protective clothing/ eye protection/ face protection. Follow good microbiological lab practices while handling specimens and culture. Standard precautions as per established guidelines should be followed while handling clinical specimens. Aseptic conditions should be maintained during inoculation and handling of the kits. Reagents should not come in contact with skin, eyes or clothing. Safety guidelines may be referred in individual safety data sheets.

Limitations:

  1. Allow the reagents to come to room temperature after removal from the refrigerator.
  2. In case of carbohydrate fermentation test some microorganisms show weak reaction. In this case record the reaction as ± and incubate further upto 48 hours. Orange colour after 48 hours of incubation should be interpreted as a negative reaction.
  3. At times organisms give conflicting result because of mutation or the media used for isolation, cultivation and maintenance.
  4. The identification index has been compiled from standard references and results of tests carried out in the laboratory.
  5. Erroneous false negative results may be obtained if the inoculum turbidity is less than 0.1 OD.
  6. Results are more prominent if an enriched culture is used instead of a suspension.
  7. It cannot be used directly for clinical specimens. The microorganisms to be identified have to be first isolated on appropriate isolation media. Only pure cultures should be used.

Performance and Evaluation

Performance of the medium is expected when used as per the direction on the label within the expiry period when stored at recommended temperature.

Quality Control

Appearance

Two Sterile white opaque strips with 12 wells each. Strip 1containing sterile media for ONPG, Lysine utilization, Ornithine utilization, Urease detection, Phenylalanine deamination (TDA), Voges- Proskauer's, Methyl red, Indole, PYR, β-Glucuronidase, α-Galactosidase, β-Xylosidase and Strip 2 for Esculin hydrolysis and 11 different carbohydrates utilization test - Sucrose, Sorbitol, Trehalose, Glucose, Cellobiose, Melibiose, Salicin, Mannose, Maltose, Raffinose, Lactose

Quantity of medium

0.8 ml of medium in each well.

Sterility Check

Passes release criteria

Interpretation of results :

Interpret results as per the standards given in the identification index. Addition of reagents should be done at the end of incubation period that is after 18 - 24 hours.

Part I:

ONPG Test: Well No. 1

  • Colour change from colorless to yellow indicates positive reaction.
  • No colour change indicates negative reaction

Lysine utilization: Well No. 2

  • Colour change to Purple / Dark Purple indicates positive reaction
  • No colour change or yellow colour indicates negative reaction.

Ornithine utilization: Well No. 3

  • Colour change to Purple / Dark Purple indicates positive reaction
  • No colour change or yellow colour indicates negative reaction.

Urease Test: Well No. 4

  • Colour changes to pink indicates positive reaction.
  • No colour change indicates negative reaction.

Phenylalanine Deamination Test: Well No. 5

  • Add 2-3 drops of TDA reagent (R036).
  • Development of dark green colour within one minute indicates a positive reaction.
  • No change in colour denotes a negative reaction.

Voges-Proskauer's Test: Well No.6

  • Add 2-3 drops of Baritt reagent A (R029) and 1 drop of Baritt reagent B (R030).
  • Positive test is indicated by a development of pinkish red colour in 5 - 10 minutes.
  • No colour change or a copper colour (due to reaction of Reagent A and Reagent B) indicates a negative reaction.

Methyl red Test: Well No. 7

  • Add 2-3 drops of Methyl red indicator (1007).
  • Positive test is indicated by a development of red colour.
  • Yellowish orange colour indicates a negative reaction.

Indole Test: Well No. 8

  • Add 2-3 drops of Kovacs reagent (R008)
  • Positive test is indicated by a development of pinkish red ring.
  • No red ring indicates a negative reaction.

PYR test: Well No. 9

  • Add 1-2 drops of PYR reagent (R043).
  • Positive test is indicated by development and retension of cherry red colour.
  • Development of pink, orange or yellow colour indicates a negative reaction.

β-Glucuronidase: Well No. 10

  • Positive test is indicated by colour change to blue/ bluish green
  • No colour change indicates a negative reaction.

α-Galactosidase: Well No. 11

  • Positive test is indicated by colour change to pink
  • Colourless/Light yellow indicates a negative reaction.

β-Xylosidase: Well No. 12

  • Positive test is indicated by colour change to purple
  • Colourless/Light yellow indicates a negative reaction.

Part II

Esculin hydrolysis: Well No. 1

  • Cream colour changes to black colour indicates a positive reaction
  • No colour change or brownish yellow indicates a negative reaction

Carbohydrate fermentation Test : Well No. 2-12

  • Positive test is indicated by a colour change to yellow colour.
  • Red or no colour change indicates a negative reaction.

Strip I Result Interpretation chart

No. Test Reagents to be added after incubation Principle Original colour of the medium Positive reaction Negative reaction
1 ONPG — Detects β-galactosidase activity Colourless Yellow Colourless
2 Lysine utilization — Detects Lysine decarboxylation Olive green to Light Purple Purple / Dark Purple Yellow
3 Ornithine utilization — Detects Ornithine decarboxylation Olive green to Light Purple Purple / Dark Purple Yellow
4 Urease — Detects Urease activity Orangish yellow Pink Orangish yellow
5 Phenylalanine Deamination 2-3 drops of TDA reagent Detects Phenylalanine deamination activity Colourless Green Colourless
6 Voges Proskauer's 2-3 drops of Baritt reagent A and 1 drop of Baritt reagent B Detects acetoin production Colourless / Light Yellow Pinkish red Colourless/ slight copper
7 Methyl red 1-2 drops of Methyl red reagent Detects acid production Colourless Red Yellowish- orange
8 Indole 1-2 drops of Kovac's red reagent Detects deamination of tryptophan Colourless Pinkish Red Colourless
9 PYR 1-2 drops of PYR reagent Detects PYR enzyme activity Cream Cherry Red Cream
10 β- Glucuronidase — For Enzymatic hydrdysis of Glucuronidase Colourless / Light Yellow Bluish Green Light Yellow
11 α- Galactosidase — For Enzymatic hydrdysis of Galactosidase Colourless / Light Yellow Pink Colourless / Light Yellow
12 β-Xylosidase — For Enzymatic hydrdysis of Xylosidase Colourless / Light Yellow Purple Colourless Light

Strip II Result Interpretation chart

No. Test Principle Original colour of the medium Positive reaction Negative reaction
13 Esculin hydrolysis Esculin hydrolysis Cream Black Cream
14 Arabinose Arabinose utilization Pinkish Red / Red Yellow Red / Pink
15 Xylose Xylose utilization Pinkish Red / Red Yellow Red / Pink
16 Adonitol Adonitol utilization Pinkish Red / Red Yellow Red / Pink
17 Rhamnose Rhamnose utilization Pinkish Red / Red Yellow Red / Pink
18 Cellobiose Cellobiose utilization Pinkish Red / Red Yellow Red / Pink
19 Melibiose Melibiose utilization Pinkish Red / Red Yellow Red / Pink
20 Saccharose Saccharose utilization Pinkish Red / Red Yellow Red / Pink
21 Raffinose Raffinose utilization Pinkish Red / Red Yellow Red / Pink
22 Trehalose Trehalose utilization Pinkish Red / Red Yellow Red / Pink
23 Glucose Glucose utilization Pinkish Red / Red Yellow Red / Pink
24 Lactose Lactose utilization Pinkish Red / Red Yellow Red / Pink

Result Entry Datasheet

No. Test 1 2 3 4 5 6 7 8 9 10
1 ONPG
2 Lysine utilization
3 Ornithine utilization
4 Urease
5 Phenylalanine Deamination
6 Voges Proskauer's
7 Methyl red
8 Indole
9 PYR
10 β- Glucuronidase
11 α-Galactosidase
12 β-Xylosidase
13 Esculin hydrolysis
14 Sucrose
15 Sorbitol
16 Trehalose
17 Glucose
18 Cellobiose
19 Melibiose
20 Salicin
21 Mannose
22 Maltose
23 Raffinose
24 Lactose

Storage and Shelf Life

On receipt store between 2-8°C. Use before expiry date on the label. Product performance is best if used within stated expiry period.

Disposal

After use, kits and the instruments used for isolation and inoculation (pipettes, loops etc.) must be disinfected using a suitable disinfectant and then discarded by incineration or autoclaving in a disposal bag. Follow established laboratory procedures in disposing of infectious materials and material that comes into contact with clinical sample must be decontaminated and disposed of in accordance with current laboratory techniques (2,3).

More Information
Product Name Hi24™ Enterobacteriaceae Identification Kit, Modified
SKU KB016
Customized Product Available No
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