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Effect of Carotenoids on Aflatoxin B1 Synthesis by Aspergillus Flavus

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Effect of Carotenoids on Aflatoxin B1 Synthesis by Aspergillus Flavus Postharvest Pathology and Mycotoxins Effect of Carotenoids on Aflatoxin B1 Synthesis by Aspergillus flavus Robert A. Norton USDA, ARS, National Center for Agricultural Utilization Research, Bioactive Agents Research, 1815 N. University, Peoria, IL 61604. Accepted for publication 24 April 1997. ABSTRACT Norton, R. A. 1997. Effect of carotenoids on aflatoxin B1 synthesis by type; lutein was similar to a-carotene and zeaxanthin was similar to ~­ Aspergillus flavus. Phytopathology 87:814-821. carotene in inhibition. A mutant accumulating norsolorinic acid (NA), A. parasitiClis SRRC 162, incubated with a-carotene produced reduced levels Carotenes and xanthophylls occurring in yellow corn and related ter­ of both NA and aflatoxin, indicating that inhibition occurred before NA. penoids were tested for their effect on growth and aflatoxin B 1 produc­ Additional A. flavus strains tested against 50 Ilg/ml of ~-carotene had 89 tion by Aspergillus flavus NRRL 3357, using the suspended disc culture to 96% inhibition, which was significantly more sensitive than NRRL method. Aflatoxin synthesis was inhibited at concentrations of ~-caro­ 3357. A. parasiticus strains were less sensitive and generally had similar tene, lutein, and zeaxanthin comparable to those found in the horny en­ or lower inhibition than NRRL 3357. The results indicate that the pre­ dosperm of mature corn. Usually growth was not significantly affected. sence of carotenoids in endosperm may decrease the amount of aflatoxin Inhibition of aflatoxin biosynthesis was greater for compounds with an produced by A.flavus. a-ionone-type ring (a-carotene, lutein, or a-ionone) compared with com­ pounds with a ~-ionone ring. The presence of hydroxy groups on the rings Additional keywords: aflatoxin inhibition, ionones. tended to decrease inhibition, but did not override the effect of the ring Aspergillus flavus and A. parasiticus are preharvest pathogens of one such group of compounds, the naturally occurring carote­ of several important food crops including com, cotton, peanuts, noids of com kernels and related compounds. Results for three and several tree nut crops (I5). Many strains of A. flavus and near­ interrelated aspects are presented: (i) the effect of carotenoids occur­ ly all strains of A. parasiticus produce aflatoxin B 1 (I9), a potent ring in com kernels and related compounds on growth and syn­ hepatotoxin (9) and carcinogen (36). There are stringent domestic thesis of AFB 1 by A. flavus NRRL 3357, (ii) the response of dif­ and foreign regulations on the amount of aflatoxins allowed in food ferent A. flavus strains and A. parasiticus strains to ~-carotene, and and feed grain that have significant economic results (28). As a re­ (iii) the effect on synthesis of norsolorinic acid (NA) and AFB I by sult, there is growing interest in developing com lines resistant to a NA-accumulating mutant. A. flavus infection or that inhibit aflatoxin production (11). Kernel resistance to A. flavus can be due either to physical! MATERIALS AND METHODS structural factors (such as pericarp resistance to splitting) or to resis­ tance that can arise from chemical effects on the fungus from me­ Compounds. ex- and ~-carotene, ex- and ~-ionone, and ex- and y­ tabolites in the various parts of the kernel. Chemical resistance can, tocopherol were obtained from Sigma Chemical Co., St. Louis. Lu­ in tum, result from inhibition of fungal growth or spore germina­ tein, zeaxanthin, ~-cryptoxanthin, and canthaxanthin were a gift of tion, with a corresponding reduction in aflatoxin, or from inhibi­ Hoffmann-La Roche, Nutley, NJ. NA was a gift of S. McCormick. tion of aflatoxin synthesis, without an equivalent effect on growth. All compounds were used as supplied. Solutions were stored at Although growth inhibition is the preferred form of resistance, a -80°C when not in use. decrease in total aflatoxin B 1 at the same level of fungal growth Assays. All compounds were tested using suspended disc cul­ would be beneficial for food safety and economical for the grower. tures as previously described (29). Briefly, the culture system was The constraints on resistance factors in edible plant parts are composed of a 20-ml scintillation vial with an open-type cap con­ greater than for nonedible parts. Therefore, if naturally occurring taining a thick, Teflon-coated septum pierced by a pin on which a components could be shown to control infection or toxin produc­ glass fiber disc was affixed. The disc contained the test solution and tion at higher levels or with different tissue specificities than in inoculum in medium and was humidified with 1 ml of sterile wa­ current com lines, then there would be less chance of encountering ter in the bottom. Discs were cut from Extra Thick Glass Fiber Fil­ undesirable side effects than would be the case if a relatively un­ ters (Gelman Sciences Inc., Ann Arbor, MI) that had been washed known compound were to be introduced into the food. The studies successively with acetone, benzene, chloroform, and methanol. Ca­ reported here were undertaken with the objective of determining the rotenoids and tocopherols were dissolved in benzene, filter-steri­ effect on growth and aflatoxin B 1 (AFB I) production by A. flavus lized, and pipetted onto the discs. Solvent was evaporated in a sterile desiccator under vacuum, and medium with inoculum was applied at five points on the top and five points on the bottom of Corresponding author: R. A. Norton; E-mail address: [email protected] discs. Discs for carotenes were 6 mm in diameter and received 29 f.ll The mention of firm names or trade products does not imply that they are en­ of medium; those used for the ex- and ~-ionone were 1 em in dia­ dorsed or recommended by the U.S. Department of Agriculture over other firms meter and received 90 f.ll of medium. Ionones were dissolved in or similar products not mentioned. ethanol at 100x the final concentration and added to inoculum at a level to give a 1% ethanol concentration. Each experiment was the Publication no. P-1997-0527-03R average of 10 replicates involving two separate incubations of five This article is in the public domain and not copyrightable. It may be freely re­ printed with customary crediting of the source. The American Phy1opathological replicates at each concentration. Each incubation used conidia from Society, 1997. different subcultures of fungus. 814 PHYTOPATHOLOGY Except as noted, A. jlavlIs NRRL 3357, which produces AFB I ness with a stream of N2 at room temperature, and the aflatoxins and AFB 2 (42), was used for all experiments. Conidia were ob­ analyzed and quantitated by HPLC as described previously (29), tained from stock cultures as described previously (29). For disc except that analysis was isocratic using water/acetonitrile (69:31, cultures, stock solutions of conidia were diluted with sterile me­ vol/vol). Although the A. jlavlIs strains produced small amounts of dium made with synthetic low salts (SL) medium salts (32) and 50 g AFB 2 in addition to AFBj, these data would not affect the inter­ of glucose made up to 1 liter with deionized water. The inoculum pretation of the data and were not tabulated. Because most of the contained 10,000 conidia/ml. A. parasiticlIs SRRC 162, an aflatoxin compounds tested showed a linear relationship between inhibition pathway mutant that accumulates NA, was obtained from N. Keller, and log concentration, the concentration required for 50% inhibition Texas A&M University, College Station. A. jlavlIs strains not given (Iso) was estimated by extrapolating between the log of the closest NRRL identifiers were obtained from D. T. Wicklow, National Cen­ concentrations above and below Iso using the linear regression func­ ter for Agricultural Utilization Research (NCAUR), Peoria, IL. tion of a calculator. In the case of a-ionone, the Iso value was ex­ Strains with NRRL identifiers were obtained from USDA-ARS, trapolated from the two concentrations below the 50% point. NCAUR, Peoria, IL. NA was extracted twice by soaking discs overnight in 2 ml of Growth determination for discs. After aflatoxin was extracted acetone. The acetone was evaporated and the residue dissolved in from discs with CHC13 (described below), 5 ml of benzene was 250 fll of acetone and then analyzed by HPLC according to the added to the vials to extract any residual test compound. Benzene method of McCormick et al. (24), except that a 25 cm x 4.6-mm, was removed, the discs dried in a fume hood, 5 ml of water was 5-~ CIS Microsorb-MV column (Rainin Instrument Co., Inc.) added, and the vials autoclaved for 15 min to extract any residual was used at a flow rate of 1.25 ml/min. NA from cultures eluted at medium. The water was removed and the discs transferred to 24­ 41.3 min, the same time as an authentic standard, and had an iden­ well tissue culture plates (Corning Glass Works, Corning, NY), tical UVNis (visible) spectrum. which had Teflon discs placed in the wells, and dried overnight at 95°C. The discs were weighed on an analytical balance (Mettler RESULTS type M5, rated accuracy of±O.002 mg; Mettler-Toledo, Inc., Hights­ town, NJ), placed in 30-well ceramic spot plates (Fisher Scientific Effect of compounds on NRRL 3357. Fungal growth on sus­ Co., Pittsburgh), and the organic material ashed in a muffle oven pended disc cultures had to be done indirectly, since it was not for 3 h at 650°C. Discs were reweighed after cooling overnight, and possible to get a direct gravimetric value. A simple and fast pro­ the difference between the two weights was corrected for the weight cedure, which was used for the work reported below, is to take the loss of similarly treated control discs inoculated with medium, but difference between the dry weight of the extracted cultures and the not spores.
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