• 한국환경보건학회지
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• 제31권2호
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• pp.127-133
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• 2005

This study was performed to investigate the competitive effect of Leuconostoc mesenteroides and Lactobacillus plantarum on the growth and aflatoxin $B_1$ production of Aspergillus parasiticus. Leu. mesenteroides and Lac. plantarum were grown with A. parasiticus in a modified APT broth at $28^{\circ}C$ for 9 days. It was observed that the growth of A. parasiticus got lower when the two bacteria were inoculated simultaneously than when the mold grew alone. The pH of mixed culture of Leu. mesenteroides and Lac. plantarum showed significantly lower value than the pH of the pure culture of A. parasiticus (p<0.05). The acidity of the mixed culture group significantly increased compared with the control group (A. parasiticus alone group) (p<0.05). The aflatoxin $B_1$ production was significantly decreased in the mixed culture group than in the A. parasiticus alone group (p<0.05). Leu. mesenteroides showed the more efficient effect than Lac. plantarum. These results indicate that the two lactic acid bacteria have inhibitory effect on the growth and aflatoxin $B_1$ production of Aspergillus parasiticus.

• Mycobiology
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• 제51권3호
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• pp.139-147
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• 2023

Aspergillus sojae has long been considered a domesticated strain of Aspergillus parasiticus. This study delineated relationships among the two species and an Aspergillus PWE36 isolate. Of 25 examined clustered aflatoxin genes of PWE36, 20 gene sequences were identical to those of A. sojae, but all had variations to those of A. parasiticus. Additionally, PWE36 developmental genes of conidiation and sclerotial formation, overall, shared higher degrees of nucleotide sequence identity with A. sojae genes than with A. parasiticus genes. Examination of defective cyclopiazonic acid gene clusters revealed that the PWE36 deletion pattern was identical only to those of A. sojae. Using A. sojae SMF134 genome sequence as a reference, visualization of locally collinear blocks indicated that PWE36 shared higher genome sequence homologies with A. sojae than with A. parasiticus. Phylogenetic inference based on genome-wide single nucleotide polymorphisms (SNPs) and total SNP counts showed that A. sojae strains formed a monophyletic clade and were clonal. Two (Argentinian and Ugandan) A. parasiticus isolates but not including an Ethiopian isolate formed a monophyletic clade, which showed that A. parasiticus population is genetically diverse and distant to A. sojae. PWE36 and A. sojae shared a most recent common ancestor (MRCA). The estimated divergence time for PWE36 and A. sojae was about 0.4 mya. Unlike Aspergillus oryzae, another koji mold that includes genetically diverse populations, the findings that current A. sojae strains formed a monophyletic group and shared the MRCA with PWE36 allow A. sojae to be continuously treated as a species for food safety reasons.

• ALGAE
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• 제29권2호
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• pp.121-126
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• 2014

Cephaleuros parasiticus and C. virescens were collected from Kerala and Tamil Nadu, India. Macroscopic and microscopic features were observed and their comparative features were discussed. The lesions of C. parasiticus occur on the upper and lower leaf surfaces although zoosporangia form only on the lower surface. The thalli grow subepidermally and intramatrically, causing necrosis of whole leaf tissue. On the other hand C. virescens thalli develop on the upper surface and zoosporangia form on the upper surface, the thalli grow subcuticularly, and only the host epidermal and palisade cells are necrosed. Syzygium aromaticum and Polyalthia longifolia are new host plants of C. parasiticus and C. virescens, respectively.

• 한국환경보건학회지
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• 제33권3호
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• pp.190-194
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• 2007

Aflatoxin $B_1$ is a mycotoxin produced by Aspergillus flavus and A. parasiticus and is a human carcinogen. This study was performed to investigate reduction of growth and aflatoxin production of A. parasiticus by kimchi. A. parasiticus was grown in a modified APT broth with the juice of kimchi (at a concentration of 7%) at $28^{\circ}C$ for 9 days. Aflatoxin $B_1$ was determined by use of high performance liquid chromatography (HPLC). The addition of the juice of kimchi significantly reduced mycelial growth and aflatoxin production during the incubation period (p<0.05). Reduction of mycelial growth of A. parasiticus as the result of addition of the juice of kimchi was observed to range between 64.8 to 83.4% while reduction of aflatoxin production ranged from 62.2 to 73.0%. This study indicates that kimchi could be an effective inhibitor of aflatoxin production although mycelial growth may be permitted. More research is needed to study the inhibitory effects of the metabolites of kimchi.

• 한국식품위생안전성학회지
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• 제12권2호
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• pp.97-101
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• 1997

Effect of allylisothiocyanate on the enzyme activites including malate degydrogenase, isocitrate dehydrogenase, NADPH and acetyl CoA which were related to aflatoxin production of Aspergillus parasticus R-716 were invetigated. The activities of malate dehydrogenase (EC.1.1.1.37), isocitrate dehydrogenase (E.C.1.1.1.42) and NADPH oxidase (E.C.1.6.99.1) indicated relatively high in the 50 ppm allylisothiocyanate-added-culture. In contrast, the activity of acetyl CoA in the 50 ppm allylisothiocyanate-added-culture showed rather lower level through the cultivation.

• 한국환경보건학회지
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• 제10권2호
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• pp.89-97
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• 1984

The possible effects of garlic (Aliium sativurn L.) extract on growth and aflatoxin production by Aspergillus parasiticus R- 716 were investigated. Various solvent extracts of garlic strongly inhibited growth and sporulation by Aspergillus parasiticus R-716, and effective solvents used for extraction of garlic were chloroform, benzene, and water-chloroform. The growth and aflatoxin production decreased with the increase in extract concentration, and extract equivalent 1.5g of raw garlic weight in 25ml SLS medium completely inhibited, and at a level of 1.25g garlic, total aflatoxin was reduced 64% (472 ${\mu}g$/25ml) of that produced in the control (1, 352 ${\mu}g$/25 ml). During cultivation inhibitory rate of growth was reduced from 89.1% to 40% and aflatoxin $B_2$, $G_1$ production increased with the laps of time. Especially garlic extract appeared to have a stimulatory effect on lipid accumulation on the contrary aflatoxin production.

• 한국식품위생안전성학회지
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• 제11권1호
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• pp.35-39
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• 1996

The effect of allyisothiocyanate, the mahor compound of radish on the growth of Aspergillus parasiticus R-716 and aflatoxin production, was investigated. An increase in the level of allylisothiocyanate results in a decrease both growth and aflatoxin per myclial weight, and the addition of 125 ppm allylisothocynate completely inhibited the growth of the strain. The addition of allylisothiocyanate to the culture of R-716 strain the production of aflatoxin. The inhibition of aflatoxin was more B-group than G-group and M-group during cultural period. The growth of strain and aflatoxin production were greatly affected by the addition of allylisothiocyanate.

• 한국환경보건학회지
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• 제35권2호
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• pp.95-99
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• 2009

This study was performed to investigate the possible effect of garlic produced in Korea on the inhibition/reduction of growth of A. parasiticus, a toxigenic strain. The effect was studied using different concentrations of freeze-dried garlic in potato-dextrose agar (PDA) and/or in yeast-extract sucrose (YES) broth at $25^{\circ}C$ for 15 days. While inhibition of the fungal growth due to increasing the concentration of garlic was observed, the more remarkable effect was observed on the ninth day. Reduction of fungal diameter as a result of addition of garlic on PDA was observed to range between 3.4% to 20.1 % while reduction of mycelial weight in YES broth ranged from 9.9% to 30.5%. The 0.5% and 1.0% concentrations of garlic significantly reduced fungal diameter in PDA on the 9th day, while 0.1 %, 0.5%, and 1.0% concentrations of garlic significantly reduced the mycelial weight in YES broth (p<0.05). Dose-response relationships were observed between the concentration of garlic and inhibition of growth both in solid culture and in liquid culture. This study indicates that garlic could be an effective inhibitor at a human consumption level of the growth of A. parasiticus. More research is needed to study the inhibitory effects of the main active component of garlic.

• 생명과학회지
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• 제30권1호
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• pp.18-25
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• 2020

상기생(Loranthus parasiticus)은 뽕나무에 기생하는 겨우살이로 전세계에 널리 분포되어 있으며, 수 세기 동안 전통 의학의 성분으로 사용되어 왔고, 최근까지 항암, 항산화, 항비만, 항염증 효과 등이 연구되었으나, 탄수화물 효소나 식후 혈당 수치에 미치는 영향에 관한 연구는 부족한 실정이다. 본 연구는 Loranthus parasiticus 추출물 (LPE)이 탄수화물 분해 효소(α-glucosidase, α-amylase) 활성 억제와 streptozotocin (STZ)으로 유도된 당뇨병 마우스에서 식후 고혈당 완화 효과를 조사하였다. 그 결과 LPE는 농도에 비례하여 α-glucosidase와 α-amylase 활성을 억제 하였고, 각각의 IC₅₀ 값으로 0.121±0.007 및 0.157±0.004 mg/ml을 나타내어 양성 대조군인 acabose 보다 유의하게 강한 억제 효과가 있음을 보여주었다(p<0.05). 또한 STZ으로 유도된 당뇨병 마우스에서는 대조군의 높은 혈당과 달리 LPE 첨가군에서는 혈당이 유의하게 감소하였다(p<0.05). 따라서, 이들 결과는 LPE가 α-glucosidase와 α-amylase 억제 효과로 식후 고혈당을 감소시킬 수 있는 천연 항고혈당 식품으로 사용 가능성을 시사한다.

• 한국환경보건학회지
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• 제21권3호
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• pp.48-55
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• 1995

This study was performed to investigate the inhibitory effect of Aloe vera on the growth and aflatoxin production of Aspergillus parasiticus. Spore suspension of A. parasiticus ATCC 15517 was inoculated on the yeast-extract sucrose broth containing 0.1%, 0.5%, 1.0% and 10.0% of chloroform extract of Aloe vera and then incubated at 30$\circ$C for 7 days. Mycelial weight was 160.7 mg/5ml in control group and decreased by the addition of the extract with no significance. The mold caused decrease in pH of the media with and without the extract. pH in the group contained 10.0% of the extract showed significantly higher value of 5.10 than that of 4.90 in control group (p<0.05). Fluorescence spots of four aflatoxins were observed under the 365 nm of UV light after extraction of the media and TLC. In the result of separation and determination by HPLC, the aflatoxins were produced in the order of $B_1, G_1, B_2$ and $G_2$ in all groups. Production of aflatoxins $B_1, B_2$ and $G_1$ was reduced by the addition of the extract and decreased as amount of the extract increased. The production of aflatoxins $B_1$ and $B_2$ significantly reduced when the media contained more than 1.0% of the extract, and $G_1$ more than 0.5%, respectively(p<0.05). No reduction and no significant difference among groups were observed in case of aflatoxin $G_2$. With the above result, the extract of Aloe vera reduced the production of aflatoxin by A. parasiticus though it did not inhibit mycelial growth.