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Aspergillus sojae and
Aspergillus oryzae play an important role in producing the distinctive taste of
soy sauce by hydrolyzing soybean proteins. The molds secrete two kinds of
metalloproteases, neutral proteinase I and neutral proteinase II (NpII). The neutral
proteinase I has properties similar to those of Bacillus thermoproteolyticus
thermolysin, an extensively characterized metalloprotease, while NpII has quite
different substrate specificity, molecular mass and thermal stability. Gripon
and colleagues characterized metalloproteases from Penicillium caseicolum and
P. roqueforti, and suggested that these metalloproteases and NpII should be
grouped under the term ‘acid metalloproteases’. These metalloproteases were
classified as deuterolysin by the IUBMB in 1992.
Studies of A. oryzae and A.
sojae strains used for shoyu production have focused on comparing these two
fungal species and improving their enzyme-producing abilities. A study of the
enzymatic differences between 11 strains of A. oryzae and 20 strains of A.
sojae showed that the activities of neutral, acid, and alkaline proteases,
xylanase, pectin lyase, phosphatase, and aminopeptidase were not significantly
different. However, acid carboxypeptidase activity and α-amylase activity were
higher from A. oryzae when compared with A. sojae strains, while
endopolygalacturonidase activity was much higher from A. sojae than from A.
oryzae (Terada et al., 1980). The ratios between α-amylase activity and
endopolygalacturonidase activity of 0.5–2 for A. sojae and 20–2000 for A.
oryzae were suggested as a differentiation criterion for the species (Terada et
al., 1980). Hayashi et al. (1981) compared the performance of these two fungi
in shoyu production. They found that the activities of protease, acetic carboxypeptidase,
and α-amylase were lower and those of endopolyglueuronidase and glutaminase
were higher in koji made with A. sojae.
In the moromi stage, the proportions of NH3
nitrogen (N), glutamic acid N, and total Ν were higher, and viscosity and heat
residue were lower with A. sojae. The resulting concentrations of citric and
succinic acids in the shoyu were significantly higher (p < 0.001) with A.
sojae than with A. oryzae. Ishihara et al. (1996) compared the volatile
components in commercial koikuchi shoyus from different factories using either
A. oryzae or A. sojae and found that the concentrations of 1- and 2-propanol,
furfuryl and benzyl alcohols, ethyl-benzoate, and lactate, acetate, pyrazines,
carbonyl compounds such as ethanal, maltol, and phenyl acetaldehyde, phenol,
and others, were higher in the shoyu from factories using the latter fungus,
but concentrations of 2-methyl- and 3-methyl − 1-butanol, 2-phenyl ethanol,
2-methyl- and 3-methyl-butanoic acid, 3-methylthio − 1-propanol, HEMF, 4-ethyl
guaiacol, 4-ethyl phenol, and others were greater in shoyu from factories using
the former fungus. These results have prompted factory managements to use A.
sojae for koji production.
Using an unusual system, Yasui
et al. (1982) tested a range of koji fungal strains for glutaminase production
and found that, when a strain showing 16% higher glutaminase activity than its
parent strain was compared with its parent in the production of shoyu, the
final glutamic acid concentration was 10% higher. In the early 1950s, A. sojae
KS was irradiated with X-rays by Iguchi to produce strain X-816 of A. sojae
(Sekine et al., 1970). Sekine et al. (1970) obtained seven strains with
superior alkaline phosphatase activity (130–190%) and highly active protease,
peptidase, cellulase, and amylase activities that were better at decomposing
soybean protein. Yokoyama and Kadowaki (1983) UV-irradiated A. sojae strain Η
and obtained mutant strains with total protease activities 2.5 times that in
wheat bran and soy sauce kojis. The mutant strains were diploidized and
combined with natural mutants from Μ strains, and strains TH and D-15 were
produced that possessed higher total protease activities than the Μ strains,
and grew well. However, UV irradiation may stimulate the production of toxic
elements in otherwise safe fungi. Kalayanamitr et al. (1987) UV-irradiated A.
flavus var. columnaris Raper and Fennel (ATCC44310) to obtain mutant strains
with high protease and amylase activities, and light-colored conidia. Some
selected mutant strains were found to be acutely toxic to weanling rats, even
though they were negative for aflatoxin production. The investigators suggested
that the toxic compound could be one of four substances: maltorhyzine,
aspergillic acid, kojic acid, or cycoopiazonic acid.
Furuya et al. (1983) fused, with
an efficiency of 1%, protoplasts derived from two strains of A. oryzae, one
with a high growth rate and the other producing high levels of protease. Two
strains derived from successful fusions showed high stability, fast growth, and
abundant sporulation and produced 2.3 times more protease than the parent
fast-growth strain. The growth and development of microorganisms on defatted
soybean and ground wheat koji prepared with A. sojae were studied by electron
microscopy by Kitahara et al. (1980). Growth of the mold on the surface of the
soybean was rapid up to 24 h, at which point formation of sporing bodies began,
and spores were released within 40 h. However, very little fungal growth was
seen on the wheat surface, but yeasts were seen growing on the wheat. Growth of
Micrococcus species became noticeable after 16 h, as did multiplication of
lactobacilli. These observations on the growth of the koji mold are at odds
with the observation that 10–20% of the dry matter in koji is lost in the koji
stage (Takeuchi et al., 1968) and the observations below on the significant
consumption of carbohydrate during the koji stage. I suggest that significant
penetration of the wheat endosperm should have been seen.
During koji production, carbohydrate
is consumed by the fungus, thus leaving less carbohydrate available to provide
flavor compounds for the final shoyu produced (Furuya et al., 1985). This
carbohydrate consumption is positively correlated with α-amylase activity in
koji culture. To overcome the depletion of carbohydrate before the moromi
stage, Furuya et al. (1985) derived mutants that utilized 10–50% less
carbohydrate during preparation of koji than the parent strain, with about 1/3,
1/20, and 1/150 of the α-amylase activity of the parent strain of A. oryzae.
Significantly increased amounts of carbohydrate-derived compounds were found in
the resulting shoyu made with these mutants.
Enhanced glutaminase activity in
koji is desirable to increase glutamic acid production in soy sauce, and
reduced conidial production in the koji reduces contamination of the air with
floating conidia (Ueki et al., 1994a). A mixed tane koji of two koji fungi, A.
oryzae strains K2 and HG, increased glutaminase activity of the mixture to 11.3
units · g− 1 dry koji, which was higher than the 4.7 or 4.4 units · g− 1 dry
koji produced by the K2 strain or HG strain, respectively, and conidia
production was reduced tenfold (Ueki et al., 1994a). The mixed tane koji was
used in the manufacture of soy sauce, and the resulting mixed koji made with
3.6 tons of defatted soybean and of wheat grain showed high glutaminase
activity (5.5 units · g− 1 dry weight koji) when compared to strain K2 alone
(1.8 units · g− 1 dry weight koji). In addition, the number of conidia in the
mixed culture was 2.5 × 107 g− 1 dry koji, which was lower than 1.3 × 108 g−
1dry koji produced by strain K2 alone. The glutamic acid content of the raw soy
sauce was 1.25 times higher than the glutamic acid level found in normal soy
sauce (Ueki et al., 1994b).
Kim and Cho (1975) investigated
soy sauce production in Korea using a soy–wheat koji prepared with A. sojae,
using natto, a soy bean product prepared with Bacillus natto, and using a
mixture of the two in varying proportions. The natto–brine mixture had protease
activity twice as high as the koji alone, and this was reflected in the
protease activities found in mixtures of the natto and koji. On comparing the
organoleptic qualities of soy sauces fermented for 3 months, the koji:natto at
a ratio of 6:4 had the best flavor, followed by koji alone.
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