Review Article

Mycotoxins Analysis in Cereals and Related Foodstuffs by Liquid Chromatography-Tandem Mass Spectrometry Techniques

Table 1

Overview on advanced LC-MS- and LC-MS/MS-based methods to study the multiple mycotoxins in cereals and cereal-based food.

MatrixAnalytesExtractionClean-up stepLC conditionsChromatographic columnSensitivity (μg/kg)References
LODLOQ

MaizeNIV
DON
FUS-X
ADONs
3ADON
DAS
HT2
T2
ZON/ZAN
CH3CN-H2O (84 : 16, v/v)Clean-up columns, MycoSep® #226 and #227 from Romer Labs®(i) Eluent A H2O-CH3OH (80 : 20, v/v), eluent B H2O-CH3OH (10 : 90, v/v), both containing 5 mM NH4CH3COO-
(ii) Gradient: 0.5 min 0% eluent B, linear gradient to 100% eluent B to 4.5 min, 100% eluent B to 7 min, 7.1 min 0% eluent B, reequilibration 3 min, total run 10 min
Thermo Electronaquasil® RP-18 column3.7
0.8
1.6
0.9
3.8
0.3
1.0
0.3
0.9
18.3
2.7
5.6
3.5
13.4
1.1
3.5
0.8
3.2
[86]

Wheat and maize18 trichothecene mycotoxins
(i) Type-A trichothecenes (T-2, HT-2, T-2 triol, T-2 tetraol, DAS, MAS, NEO, DacVOL, and VOL)
(ii) Type-B trichothecenes (DON, 3-acDON, 15-acDON, NIV, and FUSX)
(iii) Type-D trichothecenes (SG, SH, RA, and VA)
Dilute and shootMycoSep®-226(i) Eluent A CH3OH-H2O-CH3COOH (10 : 89 : 1, v/v/v), eluent B CH3OH-H2O-CH3COOH (97 : 2 : 1, v/v/v), both containing 5 mM NH4CH3COO-
(ii) Gradient 2 min at 100% eluent A, linear increase to 100% eluent B within 12 min, held at 100% eluent B for 3 min, reequilibration at 100% eluent A for 4 min, total run 19 min
Gemini® C18 column, 150 × 4.6 mm i.d., 5 μm particle size, equipped with a C18 4 × 3 mm i.d. security guard cartridge (all from Phenomenex, Torrance, CA, US)[0.064–0.41]
[0.092–0.70]
[0.20–0.38]
[0.22–1.4]
[0.31–2.2]
[0.67–1.3]
[145]

Maize, durum wheat, corn flakes, and maize crackersDON
AFG2
AFG1
AFB2
AFB1
FB1
FB2
OTA
HT-2
T-2
ZEA
2-step extraction: (1) H2O; (2) CH3OH. Evaporation and redissolution in PBS before IACAOFZDT2TM column at 1-2 drops per second; the column was then washed with 20 mL(i) Eluent A H2O, eluent B CH3OH, both containing 0.5% CH3COOH and 1 mM NH4CH3COO-
(ii) Gradient 3 min at 20% eluent B, jump to 40% eluent B, linear increase to 63% eluent B within 35 min, 63% eluent B for 11 min, reequilibration at 20% eluent B for 10 min, total run 59 min
Gemini1 C18 column (150 mm, 2 mm, 5 mm particles; Phenomenex, Torrance, CA, USA), preceded by a Gemini C18 guard column (4 mm, 2 mm, 5 mm particles)4.2
0.8
0.4
0.3
0.6
1.1
0.4
0.6
1.9
1.5
0.7
n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
[52]

Various foods and feedATB1
ATB2
ATG1
ATG2
ATM1
T-2
HT-2
VCG
CTN
OTA
3-ADON
15-ADON
FX
ZON
NIV
DON
CH3CN-H2O (84 : 16, v/v)Mycosep #226 and #228 Aflazon+ multifunctional cartridges(i) Eluent A ESI+ 10 mM NH4CH3COO-, ESI− 0.1% 0.1% (v/v) aqueous NH3, eluent B CH3OH
(ii) Gradient initially 20% eluent B, linear increase from 5.5 to 85% eluent B, 100% eluent B within 0.3 min, reequilibration for 2 min at 20% eluent B, total run 10 min
UPLCBEH C18 column (1.7 μm, 100 mm × 2.1 mm i.d., Waters)0.003
0.003
0.003
0.006
0.003
0.060
0.006
0.006
0.101
0.064
0.182
0.182
0.152
0.091
0.182
0.212
0.01
0.01
0.01
0.02
0.01
0.20
0.02
0.02
0.35
0.21
0.60
0.60
0.50
0.30
0.60
0.70
[146]

Rice, corn, wheat, rye, oat, barley, infant cereals, soya, and corn glutenAflB1
AflB2
AflG1
AflG2
DON
NIV
15-AcDON
FUSX
NEO
HT-2
T-2
FB1
FB2
ZON
OTA
QuEChERSn-hexane (5 mL) under agitation and centrifugation(i) Eluent A 0.15% (v/v) HCOOH+ 10 mM NH4HCOO-, eluent B 0.05% HCOOH (v/v) in CH3OH
(ii) Gradient: 0% eluent B at 1 min, linear increase to 100% eluent B until 15 min, 100% eluent B for 5 min, reequilibration at 0% eluent B for 5 min, total run 25 min
ZorbaxBonus-RP column 150 mm 2.1 mm i.d., 3.5 μm, equipped with a ZorbaxRB C8 guard column 12.5 mm, 2.1 mm i.d., 5 μm (both from Agilent Technologies, Geneva, Switzerland)n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
[1–10]
[1–10]
[1–10]
[1–10]
[50–250]
[100–500]
[50–250]
[25–125]
[25–125]
[25–125]
[25–125]
[5–25]
[50–250]
[50–250]
[50–250]
[0.50–2.5]
[130]

Barley3ADON, 15ADON, DON, DON-3-Glc, FUS-X, NIV, HT2, T2, DAS, NEO, AFs, OTA, FBs, STER, ZEN, penitrem A, BEA, Alternaria toxins, ergot alkaloidsQuEChERS (2 g sample, 10 mL 0.1% HCOOH in H2O, 3 min shaking, 10 mL CH3CN, 3 min shaking, 4 g MgSO4, 1 g NaCl, shaking)C18-SPE clean-up procedure was performed with Oasis HLB cartridges (150 mg) from Waters (Milford, MA, USA)(i) Eluent A H2O with 5 mM NH4HCOO- and 0.1% HCOOH, eluent B CH3OH
(ii) Gradient: start with 5% eluent B, increase to 50% eluent B in 6 min, increase to 95% eluent B within 4 min, keep until 15 min of the run, reequilibration at 5% eluent B for 3 min
Acquity UPLC HSS T3 analytical column (100 mm, 2.1 mm i.d., 1.8 mm; Waters, Milford, MA, USA)n.dn.d[133]

Barley and barley productsT-2, HT-2, T-2 triol, T-2 tetraol, DAS, NEO, DON, NIV, 3-AcDON, 15-AcDON, FUS-XAcetonitrile : water (84/16)A MycoSep® column (no. 226, CoringSystem Diagnostix, Germany)A binary linear gradient was applied which consisted of eluent A (methanol + 5 mmol/l ammonium formate) and eluent B (water + 5 mmol/l ammonium formate) with a total flow rate of 0.4 ml/min: 0 min 95% B, 11 min 95% B, 22 min 35% B, 26 min 35% B, 27 min 95% B, 35 min 95% BSynergi™ polar-RP® 150 × 2 mm, 4 μm (Phenomenex, Aschaffenburg, Germany)[0.02–2.25]n.d[53]

Cereal and cereal productsNIV
DON
AFB1
AFB2
AFG1
AFG2
DAS
FB1
FB2
HT-2
T-2
OTA
BEA
Extraction with matrix solid-phase dispersion (MSPD) methodThe gradient that started at 100% A (5 mM ammonium formate in water) and 0% B (5 mM ammonium formate in methanol) increased linearly to 100% B in 10 min, followed by a linear decrease to 80% B in 5 min, then to 70% B in 10 min. Afterwards, the initial conditions were maintained for 5 min.GeminiNX C18 (150 mm, 4.6 mm I.D., 5 μm particle size) analytical column supplied by Phenomenex (Barcelona, Spain), preceded by aguard column C18 (4 mm, 2 mm I.D.)n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
85.24
31.25
0.25
1.50
0.25
0.75
5.00
83.33
83.75
35.5
12.50
3.00
1.00
[136]

Maize, wheat, rye, oat, oat flakes, and flours (maize, wheat, rye, and oat)MONAcetonitrile/water (84/16)1M hydrochloric acid from n exchanger material (SAX). The SAX column (Bond Elut-SAX, 500 mg, 3 mL) (Agilent Technologies, Böblingen, Germany)Solvent A: 1% formic acid in methanol, and solvent B: 1% formic acid in water. The detection was set to 260 nm. An isocratic run at 20% A was performed for 10 min at a flow rate of 250 μL/min. An isocratic run at 95% A was used for 10 minA 150 mm × 2.1 mm i.d., 5 μm, Synchronis HILIC with a 10 mm × 2.1 mm i.d. guard column (Thermo Scientific, Dreieich, Germany),a 150 mm × 2.1 mm i.d., 3.5 μm0.72.5[99]

MaizeFMsWater/methanol (30/70)Sep-Pak C18 cartridgesGradient elution was performed using bidistilled water (eluent A) and acetonitrile (eluent B), both acidified with 0.2% formic acid: initial condition at 100% A, 0–5 min isocratic step, 5–30 min linear gradient to 100% B, 30–35 min isocratic step, 35-36 min linear gradient to 100% A and reequilibration step at 100% A for 14 min (total analysis time: 50 min)A 250 × 2.1 mm i.d., 5 mm, XTerra C18; the flow rate was 0.2 ml/min20n.d[156]

Cereals and cereal products (wheat, wheat-based noodles, rice, rice-based noodles, and corn)NEO
DAS
T-2
HT-2
DON
NIV
15-ac-DON
FUSX
QuEChERS methodMobile phase A consists of 1% acetic acid and 5 mM ammonium acetate in water and mobile phase B consisted of 1% acetic acid and 5 mM ammonium acetate in methanol. The gradient was changed to 80% mobile phase B over 10 min, and then maintained for 3 min. After 13 min of run time, the gradient was returned to 30% mobile phase B over 1 minZORBAX Eclipse XBD-C18, 2.1 mm, 100 mm, 1.8 mm (P.N. 928700-902) column0.02
0.02
0.05
0.02
0.045
0.05
0.02
0.04
n.d
n.d
n.d
n.d
n.d
n.d
n.d
n.d
[152]

Cereals (rice, wheat, oat, barley, and maize)Acetonitrile/water/acetic acid (79/20/1)AFs, OTA, ZEN, DON, FB1, FB2, T-2, HT-2Different proportions of mobile phase consisted of methanol or acetonitrile and acetic acid (0-1%), different flow rates (0.2-0.3 mL/min)A column, 150 mm, 4.6, 3 μm particle size C18 columns (Thermo Scientific, CA, USA)[10−5–0.02][2×10−5–0.04][87]

WheatNIV
DON
FUSX
15-AcDON
3-AcDON
DAS
NEO
HT-2
T-2
ZEN
α-ZOL
β-ZOL
Acetonitrile/water (84/16)A SecurityGuard™ cartridge C18 (4.0 3.0 mm i.d. 5 μm).Mobile phase A consisted of an H2O/CH3OH/CH3COOH mixture (89 : 10 : 1, v/v/v) containing 5 mM ammonium acetate, while mobile phase B: H2O/CH3OH/CH3COOH mixture (2 : 97 : 1, v/v/v) containing 5 mM ammonium acetate. The following gradient was applied: initial condition 55% B; 0–3 min, 70% B; 3–8 min, 100% B; 8–11 min constant at 100% B; 11–13 min returning to the initial conditions and maintain during 2 min 55% B.Phenomenex (Castel Maggiore, Italy) Gemini C18 (150 mm, 2.0 mm, i.d. 5 μm particle size, 110A)5.5
1
5.5
2
2
2
5.5
2
3
1.5
1.5
2
15
10
20
10
10
10
20
6
8
5
5
2.5
[143]

Maize and other cereals (sorghum, millet, rice, sesame, wheat, infant food, cuscus, cornflakes, and cookies)AFB1, AFB2, AFG1, AFG2, AFM1, FB1, FB2, FB3, OTA, DON, NIV, ZEN, MON, CIT, ENA, ENA1, ENB, ENB1, ENB2, BEA, STCAcetonitrile/water/acetic acid (79/20/1)Both eluents contained 5 mM ammonium acetate and were composed of methanol/water/acetic acid 10 :89 : 1 (v/v/v; eluent A) or 97 : 2 : 1 (eluent B), respectively. After an initial time of 2 min at 100% A, the proportion of B was increased linearly to 100% within 12 min, followed by a hold-time of 3 min at 100% B and 4 min column reequilibration at 100% AA Gemini C18 column, 150 × 4.6 mm, 5 μm particle size, equipped with a C18 4 × 3 mm guard cartridge, all from Phenomenex (Torrance, CA, USA).[0.005–250]n.d[157]

Breakfast and infant cerealsFB1, FB2, FB3Acetonitrile/water (85/15)A C18 security guard cartridge (4 mm × 2 mm i.d., 5 μm), both Phenomenex (Madrid, Spain)The sing gradient elution with water as mobile phase A and methanol as mobile phase B, both containing 0.5% formic acid. After an isocratic step of 65% B for 3 min, it was gradually increased to 95% B in 4 min and held constant for 3 min. Afterwards, the initial conditions were maintained for 10 minA Luna C18 analytical column (150 mm × 4.6 mm i.d., 5 μm) Phenomenex (Madrid, Spain)n.dn.d[158]

Barley, maize breakfast cereals, and peanutsAFB1
AFB2
AFG1
AFG2
FB1
FB2
FB3
DON
ZEN
HT2
T2
OTA
CH3CN-H2O-CH3COOH (79.5 : 20 : 0.5, v/v/v). Evaporation and redissolution in PBS before IAC(i) Eluents A H2O, eluent B CH3OH, both containing 5 mM NH4CH3COO-
(ii) Gradient 5% eluent B increased to 50% eluent B in 1 min, linear increase to 100% eluent B within 6 min, 100% eluent B to 8 min, at 8.1 min initial conditions 5% eluent B, reequilibration at 5% eluent B for 2 min, total run 10 min
0.05
0.05
0.05
0.05
5
5
5
1
1
0.5
0.5
0.1
0.1
0.1
0.1
0.1
10
10
10
5
5
1
1
0.25
[159]

Maize and maize-beer69 mycotoxinsExtraction with many solvents (ACN/water/glacial acetic acid 79 : 20 : 1, v/v/v)(i) Two eluting solvents (eluent A and eluent B) that each contained 5 mM ammonium acetate were prepared using MeOH/water/glacial acetic acid (10 : 89 : 1, v/v/v) (eluent A) and (97 : 2 : 1, v/v/v) (eluent B)
(ii) After an initial time of 2 min at 100% eluent A, the proportion of eluent B was increased linearly to 50% within 2–5 min and to 100% within 5–14 min, followed by a holding-time of 4 min at 100% eluent B and 2.5 min column reequilibration at 100% eluent A
A Gemini C18 column (Phenomenex, Torrance, CA, US).[0.05–0.14][3–41][92]

Maize and cereal-based productsAFB1
AFB2
AFG1
AFG2
DON
FB1
FB2
HT2
OTA
T2
ZEN
Raw extract(i) Eluent A H2O–HCOOH (99.9 : 0.1, v/v), eluent B CH3OH–HCOOH (99.9 : 0.1, v/v) both containing 5 mM NH4HCOO-
(ii) Gradient: 0.5 min at 30% eluent B, linear increase to 100% eluent B in 7.5 min, hold at 100% eluent B for 1.5 min, at 9.6 min back to 30% eluent B, reequilibration at 30% eluent B for 2 min, total run 11.5 min
A ZORBAX RRHD Eclipse Plus C18 (100 × 2.1 mm, 1.8 μm) column from Agilent Technologies0.04
0.04
0.2
0.1
3.4
1.4
1.3
0.8
0.1
0.1
1.2
0.1
0.1
0.1
0.4
1
4.3
3.9
2.5
0.4
0.2
2.9
[160]

Barley, malt, oat, wheat, and maizeDON
3-ADON
15-ADON
HT2
T2
BEA
FUSX
NIV
ZEA
CH3CN-H2O (84 : 16, v/v),(i) Eluent A H2O-HCOOH (99.9 : 0.1, v/v), eluent B CH3OH-HCOOH (99.9 : 0.1, v/v); gradient ESI− 2 min at 10% eluent B, linear increase to 99% eluent B in 6 min, hold at 99% eluent B for 7.5 min, for 2 min back to 10% eluent B, reequilibration at 10% eluent B for 9.5 min, total run 25 min; ESI+ 2 min at 10% eluent B, linear increase to 87% eluent B in 6 min, hold at 87% eluent B for 7 min, increase to 100% eluent B in 5 min, hold at 100% eluent B for 3.5 min, for 2 min back to 10% eluent B, reequilibration at 10% eluent B for 9.5 min.A Shimadzu LC-20A Prominence system (Shimadzu, Kyoto, Japan) using a Hydrosphere RP-C18 column (150 × 3.0 mm2, S-3 μm, 12 nm, YMC Europe GmbH, Dinslaken, Germany).0.9
1.7
4.6
0.1
0.2
0.3
5
5
0.5
2.6
13.5
13.5
0.2
0.5
0.7
3.1
2.9
1.5
[95]