Advances in Bioscience and Biotechnology, 2011, 2, 214-225
doi:10.4236/abb.2011.24032 Published Online August 2011 (http://www.SciRP.org/journal/abb/
ABB
).
Published Online August 2011 in SciRes. http://www.scirp.org/journal/ABB
Effect of assay conditions on the measurement of
dehydrogenase activity of Streptomyces venezuelae using
triphenyl tetrazolium chloride
Tracey Burdock, Marianne Brooks*, Abdel Ghaly, Deepika Dave
Department of Process Engineering and Applied Science, Dalhousie University, Halifax, Canada.
Email: *Su-Ling.Brooks@dal.ca
Received 9 April 2011; revised 19 June 2011; accepted 20 July 2011.
ABSTRACT
Jadomycin is an antibiotic that has shown activities
against bacteria, yeasts and fungi as well as cytotoxic
properties to cancer cells. Because of the wide range
of its inhibitory actions, jadomycin shows promise as
a novel antibiotic and cancer treatment drug. Strep-
tomyces venezuelae are aerobic bacteria that produce
jadomycin and the size of bacterial population can
significantly affect the yield of jadomycin. Therefore,
the bacterial population must be accurately meas-
ured in order to standardize the reproducibility of
jadomycin production process. In this study, a dehy-
drogenase activity measurement test, using triphenyl
tetrazolium chloride (TTC), was used to measure the
dehydrogenase activity of Streptomyces venezuelae dur-
ing growth in maltose-yeast extract-malt extract ( M YM)
broth. The aims were to evaluate the effectiveness of
the test for measuring microbial growth and to study
the effects of the test conditions (incubation time, in-
cubation temperature and medium pH) on triphenyl
formazan (TF) yield. The results showed that the TF
yield was highly correlated to the optical density. The
highest TF yield was observed at a pH of 6 at all in-
cubation times and temperature. Lower TF yields
were obtained at higher temperature (40˚C and 50˚C)
compared to those obtained at lower temperatures
(22˚C and 30˚C). The difference between the yields
obtained at 22˚C and 30˚C were not significant. The
differences between incubation time were also not
significant. The recommended test conditions are an
incubation time of 1 hour at a temperature of 30˚C
and a pH of 6 followed by three extractions using
methanol.
Keywords: Dehydrogenase Activity; Growth; Triphenyl
Tetrazolium Chloride (TTC); Triphenyl Formazan; Jado-
mycin; Streptomyces venezuelae; Temperature; pH; In-
cubation Time
1. INTRODUCTION
Jadomycins are type II polyketide synthesis-derived
secondary metabolites produced by the actinomycete
Streptomyces venezuelae [1]. Jadomycins have demon-
strated antibacterial, antitumor, antifungal and enzyme
inhibitory functions as well as cytotoxic properties to the
cancer cells [2]. They are considered to be promising
novel antibiotics and cancer treatment drugs [3]. The pro-
duction of jadomycin takes place in a nutrient-deprived
(exhaustion of carbon, nitrogen or phosphate from the
culture medium) amino acid rich environment assisted
by environmental shock using ethanol or heat [4]. The
formation of the cyclized product of jadomycin is due to
the presence of amino acids in the culture medium which
has a biosynthetic aldehyde precursor that generates a
reactive aldimine to form jadomycin [5]. The production
yield of jadomycin has been extensively linked to the
mass of vegetative cells of Streptomyces venezuelae that
is transferred from the growth medium to production
medium [6]. Therefore, it becomes essential to determine
the viable cell mass of Streptomyces venezuelae in growth
media for the improvement and regularization of the re-
producibility of the jadomycin production process.
Dehydrogenase activity measurement can be used for
the determination of bacterial growth and metabolism
[7]. The test is based on the fact that the dehydrogenase
enzymes are produced by all living cells and the extend
to which the enzymes oxidize organic matter can be re-
lated to the number of living cells during the growth
phase and their activities during the production phase [8].
The dehydrogenase enzymes transport electrons and a
hydrogen atom from an oxidized matrix to an electron
acceptor [9,10].
Dehydrogenase
2
RHR + 2H 2e
substrate Oxidized
substate


(1)
T. Burdock et al. / Advances in Bioscience and Biotechnology 2 (2011) 214-225 215
The dehydrogenase activity is largely measured using
the triphenyl tetrazolium chloride (TTC) salt as a hy-
drogen acceptor [11,12]. TTC is a colourless salt which
turns to a red triphenyl formazan (TF) dye as soon as it
accepts hydrogen atoms. The TTC activity is determined
colorimetrically by measuring the irreversible colour
change (red color) during the reaction.
Different solvents are used for the extraction of TF
from cells and the TF concentration is determined by
measuring the optical density. The TF produced from the
test is used as a measure of the amount of the living cells
[8,13-15]. However, TF yield is depends upon several
factors: type of solvent, number of extractions, incuba-
tion time, incubation temperature, and medium pH [16].
The purpose of this study was to evaluate the effects of
assay conditions (medium pH, incubation time and in-
cubation temperature) on dehydrogenase activity and the
TF yield from S. venezuelae.
2. MATERIALS AND METHODS
2.1. Reagents
Tris (hydroxymethyl)-aminomethane and triphenyl tetra-
zolium chloride (TTC) were used to measure the dehy-
dorogenase activity. A TTC-glucose reagent (1 g glucose
and 2 g TTC dissolved in 100 mL distilled water) was
prepared and stored in the dark at 4˚C until used. Triphenyl
formazan (TF) dye was used to establish a standard
curve for absorbance (OD484) vs. TF concentration. NaOH
and HCl were used to adjust the pH of the sample. Etha-
nol and methanol were used to extract the TF from bac-
terial cells. The Tris, TTC, TF, ethanol, methanol, NaOH
and HCl were obtained from Sigma-Aldrich (Oakville,
Ontario, Canada) and glucose was obtained from BioShop
(Burlington, Ontario, Canada). Ethanol and methanol were
obtained from Fisher Scientific (Montreal, Quebec, Can-
ada).
2.2. Media Preparation
Maltose-yeast extract-malt extract (MYM) agar and
broth were used to cultivate Streptomyces venezuelae.
The composition of MYM agar and broth are shown in
Table 1. MYM media components.
Quantity(g/L distilled water)
Component Agar Broth
Maltose 4.0 4.0
Yeast Extract4.0 4.0
Malt Extract10.0 10.0
MOPS 1.9 1.9
Agar 15.0 -
Table 1. All media components were obtained from
BioShop (Burlington, Ontario, Canada). The media com-
ponents were dissolved in the distilled water then auto-
claved (SterileMax, Harvey Thermo Fisher Scientific,
Ottawa, Ontario, Canada) on the liquid setting (121˚C,
20 Pa) for 15 minutes. The autoclaved agar was stored at
65˚C to prevent solidification
2.3. Bacteria
An initial starter plate of Streptomyces ven ezuela e ISP5230
was obtained from the Brooks Biotechnology Laboratory,
Faculty of Engineering, Dalhousie University (Halifax,
Nova Scotia, Canada) and stored at 4˚C. The surface
growth was used to inoculate maltose-yeast extract-malt
extract (MYM) agar plates or flasks with MYM broth.
2.4. Triphenyl Formazan (TF) Standard Curve
A standard curve was developed to determine the con-
centration of TF (µmol/mL) corresponding to an ab-
sorbance measurement at 484 nm (OD484). A stock so-
lution of 0.2 µmol/mL was prepared by dissolving 0.03 g
TF in 500 mL methanol. The stock solution was diluted
with methanol to produce 11 solutions with TF concen-
trations ranging from 0.004 to 0.10 µmol/mL. The ab-
sorbance of each solution was measured with a spectro-
photometer (Genesys 20, Thermo Scientific, Missis-
sauga, Ontario, Canada) at a wavelength of 484 nm. The
absorbance readings (OD484) were plotted against the TF
concentration (µmol/mL) as shown in Figure 1. The
following linear best-fit Equation (R2 = 0.98) was ob-
tained:
484 10.574 TFOD
(3)
(2)
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216
where:
OD484 is the absorbance reading at 484 nm (AU)
TF is the concentration of triphenyl formazan (µmol/
mL of extraction solvent)
2.5. Bacterial Growth
Three 250 mL shake flasks were filled with 175 mL of
MYM broth, plugged with foam caps, covered with alu-
minum foil and autoclaved (SterileMax, Harvey Thermo
Fisher Scientific, Ottawa Ontario, Canada) for 15 min-
utes at 121˚C and 20 Pa. The flasks were then inoculated
with S. venezuelae and incubated in a controlled envi-
ronment shaker (25 Incubator Shaker, New Brunswick
Scientific, Edison, New Jersey, USA) at 30˚C and 250
rpm. Each flask was sampled at 0, 2, 12, 14, 17, 20, 22,
37, 40, 42, 62 and 64 hours after inoculation and the
extent of cell growth was monitored over a period of 64
hours by measuring the optical density at 600 nm (OD600)
and the dehydrogenase activity (TF yield).
To measure the dehydrogenase activity at each sam-
pling time, an aliquot of 1 mL was transferred from each
flask into each of the four test tubes (three replicates and
control). The pH was adjusted to 7.5 using 1 N NaOH or
HCl. Tris buffer (2.5 mL) was added to the all test tubes.
This was followed by 1 mL of TTC/glucose solution
added to the three sample test tubes whereas 1 ml dis-
tilled water added to control tube. The tubes were gently
swirled to mix the contents, incubated at 50˚C for 1 hour
in a temperature controlled oven (Isotemp Oven, Model
630F, Fisher Scientific, Ottawa, Ontario, Canada) and
then centrifuged (IEC Centra CL2, Thermo Electron
Corporation, Mississauga, Ontario) for 10 minutes to
separate the cells from the liquid media. The supernatant
was discarded and 2.5 mL of methanol was added to the
cells in the tubes. All tubes were vortexed (Thermolyne
Maxi Mix, Thermolyne Corporation, Hampton, New
Hampshire, USA) to aid in the extraction of TF from the
cells. Samples were centrifuged again and the super-
natant decanted. Two more extractions with methanol
were carried out as recommended by Burdock [17] and
the supernatants were combined with that from the first
extraction. The absorbance of three combined super-
natant extractions was measured at 484 nm in a spectro-
photometer (Genesys 20, Thermo Scientific, Missis-
sauga, Ontario, Canada). The control test tube was used
to adjust the spectrophotometer to zero. The TF yield
was then determined using Eq. 3 .
2.6. Evaluating the Test Parameters
Experiments were conducted to determine the effect of
test conditions on the reduction of TTC to TF and the
optimum combination that allow the extraction of the
highest amount of TF from S. venezuelae during growth
in MYM media. The dehydrogenase activity assay pa-
Figure 1. Standard curve relating TF concentration to absorbance at 484 nm (n = 3).
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rameters investigated were: incubation time (1, 2, 3 and
4 h), incubation temperature (22˚C, 30˚C, 40˚C and 50˚C
and medium pH (6.0, 7.5 and 9.0). Three extractions
with methanol were carried out as recommended by
Burdock [17]. The experiments were carried out in com-
pletely randomized factorial design (3 × 4 × 4) with
three replicates, resulting in 144 experimental runs. The
contents of all flasks were collected after 64 hours of
growth, combined in a 1 L flask and refrigerated at 4˚C
until required. For a given incubation temperature-medium
pH—incubation—time combination, a 1 mL aliquot of
the MYM broth containing S. venezuelae growth was
added to each of four test tubes (three replicates and a
control). The pH was adjusted to the desired value (6, 7
or 9) using 1 N HCl or NaOH. Tris buffer (2.5 mL) and
TTC/glucose solution (1 mL) were added to each of the
three sample test tubes whereas 1 ml distilled water was
added to control tube. The tubes were manually swirled
to mix contents and incubated for the assigned time (1, 2,
3 or 4 hours) at the desired temperature (22˚C, 30˚C,
40˚C or 50˚C). Tubes were incubated at 22˚C or 30˚C in
an environment controlled incubator (Model 2020, VWR
International, Cornelius, Oregon, USA) and at 40˚C or
50˚C in a temperature controlled oven (Isotemp Oven,
Model 630F, Fisher Scientific, Ottawa, Ontario, Canada).
Samples were then centrifuged for 10 minutes to sepa-
rate the cells from the liquid media. The supernatant was
discarded and extraction of TF from the cells was carried
out using 2.5 mL methanol. Three extractions were car-
ried out and the supernatants from the three extractions
were combined. The absorbance was then measured at
484 nm in a spectrophotometer (Genesys 20, Thermo
Scientific, Mississauga, Ontario, Canada). The control
test tube was used to adjust the spectrophotometer to
zero. The TF yield was then determined using Eq.3.
3. RESULTS
3.1. Bacterial Growth
The growth of S. venezuelae as measured by the optical
density at 600 nm (OD600) and the triphenyl formazan
yield (TF) is presented in Figure 2. The results showed
an initial lag period followed by exponential growth. The
lag period was required for the bacteria to adjust to the
new environmental condition and to produce the enzyme
required for the utilization of growth substrate in the
medium. The lag period and specific growth rate were
determined graphically according to the procedure de-
scribed by Ghaly et al. [18] as shown in Figure 3. The
lag period and specific growth rate were 10.3 hours and
0.3 h–1 respectively.
3.2. Assay Parameters
Figure 4 shows the effect of medium pH on the TF yield
at varying incubation times and incubation temperatures.
All plots displayed similar shapes with the pH value of
7.5 resulting in the lowest TF yield and the pH value of
6 resulting in the greatest TF yield. Figure 5 shows the
effect of incubation time on the TF yield at varying in-
cubation temperatures and medium pH values. The re-
sults showed slight increases in TF yield at longer incu-
bation time. Figure 6 shows the effect of incubation
temperature on the TF yield at different incubation times
and medium pH values. The results showed that higher
incubation temperatures (40˚C and 50˚C) resulted in
lower TF yields than these obtained at lower incubation
temperatures (22˚C and 30˚C).
Tabl e 2 shows the analysis of variance performed out
on the TF yield data. The medium pH, incubation time
and incubation temperature had significant effects on TF
yield (P < 0.001) with pH 6 having the highest TF yield.
The two-way interactions (pH-Time, pH-Temperature
and Time-Temperature) were also significant (P < 0.008)
but the three-way interaction was not significant. Table
3 shows the results of Duncan multiple range test per-
formed on the TF data. All three levels of the medium
pH were significantly different from one another (P <
0.05) with pH 6 having the highest TF yield. The incu-
bation temperatures of 22˚C and 30˚C were not signifi-
cantly different from one another. Also, the incubation
temperatures of 40˚C and 50˚C were not significantly
different from one another. However, the lower tem-
peratures (22˚C and 30˚C) had significantly higher TF
yield than the higher temperatures (40˚C and 50˚C). All
the four incubation times were not significantly different
from one another.
4. DISCUSSION
4.1. Bacterial Growth and Activity
Jakeman et al. [6] monitored S. venezuelae population
during the growth period by measuring the optical den-
sity at 600 nm (OD600). In this study, the change of S.
venezuelae population during the growth period was
Tabl e 2 . Analysis of variance for dehydrogenase activity test
parameters.
Source DF SS MS F-Value P
Total 143 49.5667
Model 47 40.0942
pH 2 10.98505.493 61.134 0.0001
t 3 1.6077 0.536 5.961 0.0010
T 3 18.07706.026 67.066 0.0001
pH × t 6 1.9600 0.327 3.636 0.0030
pH × T 6 3.7340 0.622 6.927 0.0001
t × T 9 2.3770 0.264 2.939 0.0040
pH × t × T18 2.2010 0.122 1.361 0.1700
Error 96 8.6250 0.090
pH = Medium pH; t = Incubation Time (hours); T = Incubation Temperature
(˚C); R2 = 0.83.
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(a)
(b)
Figure 2. S. venezuelae growth in nutrient rich MYM broth as measured by optical density and TF yield.
monitored by measuring the optical density at 600 nm
(OD600) and the triphenyl formazan yield (TF) (Table 4).
The relationship between OD600 and TF is presented in
Figure 7. The amount of TF extracted was correlated (R2
= 0.9833) with OD600.
The specific growth measured in this study was 0.3
h–1. Abdel-Fattah [19] reported maximum specific growth
rates of 0.57 and 0.23 h–1 for S. venezuelae grown in
media containing glucose and soluble starch at 30˚C,
respectively. Glazebrook et al. [20] reported a maximum
specific growth rate of 0.14 h–1 for S. venezuelae grown
in MYM medium at 27˚C.
4.2. Assay Parameters
A significantly acidic pH (1.5 - 3) was found to result
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Figure 3. Graphical determination of the lag period and specific growth rate.
Table 4. Means of TF yield for pH, incubation temperature and
incubation time.
Parameter Number of
observations Mean of
TF yieldDuncan
Grouping*
pH
6.0 48 1.195 A
7.5 48 0.525 B
9.0 48 0.780 C
Incubation Temperature
(˚C)
22 36 1.240 A
30 36 1.101 A
40 36 0.632 B
50 36 0.359 B
Incubation Time (hours)
1 36 0.693 A
2 36 0.804 A
3 36 0.843 A
4 36 0.988 A
*Means with different letters are significantly different from one another at
95% confidence level.
in higher TTC reduction in lichens [21]. No other reports
for higher TF yields at acidic pH were found in the lit-
erature. However, higher TF values are always associ-
ated with natural or slightly alkaline conditions. Mah-
moud and Ghaly [13] found that at a pH of less than 7,
no reduction of TTC occurred for Kluyveromyces fragilis
growing in cheese whey and mixed culture growing in
compost materials. Jones and Prasad [22] measured slu-
dge activity and noticed a considerable amount of TTC
reduction at pH 7.6 compared to pHs 3.2 and 5.3. Mersi
and Sehinne [23] reported optimal iodonitrotetrazolium
chloride (INT) reduction in soils at pH 7.0. Brzezińska et
al. [24] observed maximum dehydrogenase activity in
soils at pH of 6.6 - 7.2. Ghaly and Ben-Hassan [25]
found maximum dehydrogenase activities for both Kluy-
veromyces fragilis and Candida pseudotropicalis yeast at
a pH of 7 and lower activities at the more acidic and
basic levels of pH. Higher TF yield was observed at a
pH of 9 for A. niger by Ghaly and Mahmoud [26]. How-
ever, at high pH values non-enzymatic reduction of TTC
to TF may also occur [13]. It is not clear if non-enzy-
matic reduction of TTC to TF occurred at a pH of 9 in
this study. The results indicated that a pH of 6 is the
most appropriate value for measuring dehydrogenase
activity in S. venezuelae during growth in MYM broth.
Several investigators reported that incubating samples
for longer times increased the extent of TTC reduction to
TF. Mahmoud and Ghaly [27] reported that TF yield
increased exponentially with incubation time for A. niger
in the range of incubation periods studied (1.5 - 4.5 hours).
Ghaly and Ben-Hassan [25] found that the TF yield in-
creased with increased incubation time for both Kluy-
veromyces fragilis and Candida pseudotropicalis yeast
ells, but appeared to plateau after about 80 hours in c
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(a)
(b)
Figure 4. Effect of pH on triphenyl formazan formation (TF) at various incubation temperatures and times. (a) Incubation
Time; (b) Incubation Temperature.
both cases. Mathew and Obbard [28] reported increasing
INT-formazan yield with increased incubation time for
petroleum-contaminated beach sediments and observed
leveling off of TF yield after 22 hours of incubation.
Tengerdy et al. [29] reported increasing TF yield of E.
oli and S. aureus cultures during a 30 hours incubation c
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(a)
(b)
Figure 5. Effect of incubation time on triphenyl formazan (TF) formation at various incubation temperatures and medium pH
values. (a) Incubation Temperature; (b) Medium pH Value.
period and observed stationary yield of TF after 30 hours.
Griebe et al. [30] incubated activated sludge for a period
of 24 hours with redox-sensitive dye 5-cyano-2,3-ditolyl
tetrazolium chloride (CTC) and found no further in-
crease in fromazan yield after 2 hours of incubation. In
his study, a slight increase in TF yield from S. venezue- t
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(a)
(b)
Figure 6. Effect of incubation temperature on triphenyl formazan (TF) formation at different incubation times and me-
dium pH values. (a) Incubation Time; (b) Medium pH Value.
lae was observed when the incubation time was in-
creased from 1 to 4 h. It also, appears that longer incuba-
tion times are required for lower temperatures (22˚C and
30˚C) compared to those required for higher tempera-
tures (40˚C and 50˚C). However, the increases in TF
ield observed in this study due to increase in incubation y
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Figure 7. The relationships between OD600 and TF.
time do not appear to be significant and 1 hour incuba-
§tion time seems to be more practical as it produced a
measurable amount of TF.
There have been reports in the literature of higher TF
yields as a result of increasing incubation temperatures
for mixed microbial populations in soil [31] and for the
fungus A. niger in chitin [27]. Mersi and Sehinne [23]
reported that increases in incubation temperature from
25˚C to 40˚C significantly increased the dehydrogenase
activity but further increases in incubation temperature
to 50˚C resulted in a rapid decrease of Iodonitrotetra-
zolium Chloride (INT) reduction. Tiquia et al. [32] re-
ported the highest level of dehydrogenase activity in
yard trimming composting at temperatures in the range
of 30˚C - 35˚C. Xie et al. [8] reported that the maximum
TF yield of algae (Chlorella algae) in fresh water was
reached at a temperature of 32˚C. Zhao et al. [33] re-
ported higher (107 folds) dehydrogenase activity for
heavy metal-organic contaminated sewage river sedi-
ment at incubation temperature of 30˚C than that of 4˚C.
In this study, the lower TF yields observed at 40˚C and
50˚C may be due to the inhibition of the enzymatic ac-
tivity of S. venezuelae. S. venezuelae are soil bacteria
and, therefore, achieve optimal growth and activity
within the temperature range of 22˚C - 30˚C [34]. Doull
et al. [35] reported decreasing growth for S. venezuelae
at temperatures higher than 37˚C compared to that ob-
served at a temperature of 27˚C. Based on the results
obtained in this study, an incubation temperature within
the range of 22˚C - 30˚C is the preferred temperature for
conducting the dehydrogenase test with TTC for S.
venezuelae
5. CONCLUSIONS
The dehydrogenase activity test using triphenyl tetra-
zolium chloride (TTC) was employed to measure the
growth and activity of Streptomyces venezuelae in MYM
broth. The results showed high correlation between the
absorbance and the TF yield. The effects of test parame-
ters (incubation temperature, incubation time and me-
dium pH) were evaluated in order to determine the op-
timum test conditions. The three parameters significantly
affected the TF yield. There also seem to be significant
interactions between the medium pH, incubation tem-
perature and incubation time. In general, a pH of 6 gave
the high TF yields and a pH of 9 gave higher TF yield.
Lower TF yields were observed at 40˚C and 50˚C and
higher yields occurred at 22˚C and 30˚C The increases in
TF yield due to increase in incubation time were not
significant. The recommended conditions for the reduc-
tion of TTC and the extraction of high amount of TF are
1 hour incubation at a temperature of 30˚C and a me-
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dium pH of 6 followed by three extractions of TF with
methanol.
6. ACKNOWLEDGEMENTS
The research was funded by National Science and Engineering Re-
search Council (NSERC) of Canada.
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