2.2. Extraction procedure
A. niger strain SS10 was grown on PDA (Difco, USA) at
30 ± 2 C for seven days and obtained as mycelia in a liquid
culture of potato dextrose broth (PDB) (Difco, USA), prepared
as per the manufacturer’s instructions. Aliquots of the
media (250 mL) were decanted into individual 1000-mL Erlenmeyer
flasks, closed with cotton wool stoppers placed over the
flask mouths, and then autoclaved at 121 C and 1.4 kg cm1
for 15 min. After the flask cooled down, the fungal mycelium
on the culture plates was cut in disks, 5 mm in diameter, and
placed in the center of the broth-cultured flask. The cotton
wool stoppers were then wrapped with aluminum foil, sealed
with parafilm, and incubated at 30 ± 2 C (12-h-darkness/
12-h-light cycle) on a rotary shaker for 14 days at 120 rpm
for the culturing of A. niger.
The cultured inoculums of A. niger were processed according
to the extraction procedures, shown in Supplementary
Fig. 1, to collect broth containing both extracellular (excreted
into the medium) and intracellular volatile compounds. Then,
225 mL of ethyl acetate were added into the inoculums cultured
in an Erlenmeyer flask, and the mixture was incubated
overnight to ensure that the fungal cells died. The mixtures
were then applied to UltraTurrax homogenizer for 10 min
(for cell destruction), followed by filtration using a Bu¨chner
vacuum separation funnel. The extracted mycelia (cell debris)
were thrown away, and the filtrate containing the ethyl acetate
phase was collected for further processing.
The ethyl acetate phase was washed with distilled water
twice. The ethyl acetate extracts were diluted in 100-mL each
of methanol and n-hexane to remove fatty acids (polar elements)
and other nonpolar elements. The solvents were then
separated using a Bu¨chner vacuum separation funnel. The solvents
were evaporated at 40 C on a rotary evaporator–shaker
until a 5-mL solvent volume was reached; then this sample was
immediately used for GC–MS analysis or stored in the deep
freezer at 20 C. Each solvent was subjected to three replications
in the experiments.
2.2. Extraction procedureA. niger strain SS10 was grown on PDA (Difco, USA) at30 ± 2 C for seven days and obtained as mycelia in a liquidculture of potato dextrose broth (PDB) (Difco, USA), preparedas per the manufacturer’s instructions. Aliquots of themedia (250 mL) were decanted into individual 1000-mL Erlenmeyerflasks, closed with cotton wool stoppers placed over theflask mouths, and then autoclaved at 121 C and 1.4 kg cm1for 15 min. After the flask cooled down, the fungal myceliumon the culture plates was cut in disks, 5 mm in diameter, andplaced in the center of the broth-cultured flask. The cottonwool stoppers were then wrapped with aluminum foil, sealedwith parafilm, and incubated at 30 ± 2 C (12-h-darkness/12-h-light cycle) on a rotary shaker for 14 days at 120 rpmfor the culturing of A. niger.The cultured inoculums of A. niger were processed accordingto the extraction procedures, shown in SupplementaryFig. 1, to collect broth containing both extracellular (excretedinto the medium) and intracellular volatile compounds. Then,225 mL of ethyl acetate were added into the inoculums culturedin an Erlenmeyer flask, and the mixture was incubatedovernight to ensure that the fungal cells died. The mixtureswere then applied to UltraTurrax homogenizer for 10 min(for cell destruction), followed by filtration using a Bu¨chnervacuum separation funnel. The extracted mycelia (cell debris)กระเด็นออกไป และสารกรองที่ประกอบด้วย acetate เอทิลขั้นตอนรวบรวมประมวลผลต่อไประยะเอทิล acetate ถูกล้าง ด้วยน้ำกลั่นสอง สารสกัดเอทิล acetate ถูกผสมใน 100-mL แต่ละเมทานอลและเอ็นเฮกเซนเอากรดไขมัน (องค์ประกอบขั้วโลก)และองค์ประกอบอื่น ๆ nonpolar หรือสารทำละลายถูกแล้วแยกใช้ปล่องดูดแยก Bu¨chner หรือสารทำละลายได้หายไปที่ 40 C บนที่ evaporator – เชคเกอร์โรตารี่จนถึงระดับเสียงเป็นตัวทำละลาย 5 mL แล้ว อย่างนี้ถูกใช้สำหรับวิเคราะห์ GC – MS หรือเก็บไว้ในทันทีตู้ที่ 20 เซลเซียส ตัวทำละลายแต่ละถูกต้องระยะสามในการทดลอง
การแปล กรุณารอสักครู่..
