Abstract SCHIRACK, ANDRIANA VAIS. The Effect of Microwave ...

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treatment was over 100 °C, similar to the 11NF treatment and the peanuts in Set 2 which ranged from 119 – 139 °C. In temperatures under 100 °C, Datta and Liu (1992) found that temperature profiles became increasingly non-uniform over longer heating times during microwave processing. However, Ni et al. (1999) found that the non-uniformity in temperatures is lessened when the food temperature reaches the boiling point of water. The same study (Ni et al, 1999) also found that the key variable which controls moisture loss during the microwave heating of solid foods was achieving an average temperature uniformly. By evaluating the maximum temperatures reached during processing, it was seen that the internal temperatures during the 8NF treatment exceeded 100 °C, and perhaps reached a more uniform temperature profile, leading to greater moisture loss and acceptable blanchability. CONCLUSIONS The use of microwave technology for peanut blanching provides a significant decrease in processing time and can result in cost savings. In this study, the relationships between temperature, moisture content, and blanchability using a continuous belt processing method have been demonstrated. Effective blanchability was correlated to high process temperatures and corresponding low moisture content. All peanuts with internal temperatures exceeding 110 °C and reaching a final moisture content of 5.5 % or below yielded acceptable blanchability. Even peanuts varying in initial moisture content resulted in a low final moisture content and acceptable blanchability. This study demonstrated that peanuts heated by 104
microwave attain much higher temperatures than conventional multizone oven heated peanuts. The time required to generate sufficient heat to dry peanuts for acceptable blanchability is greatly reduced by the use of microwave technology. ACKNOWLEDGMENTS Funded in part by the North Carolina Agricultural Research Service. Paper no. --- of the Journal Series of the Dept. Food Science, North Carolina State University, Raleigh, NC 27695. The assistance of Keith Hendrix and Jim Schaefer is gratefully acknowledged. The authors would also like to thank Marshall Lamb and Bobby Tennille of USDA, ARS, National Peanut Laboratory (Dawson, Georgia) for supplying the peanuts used in this study. The use of trade names in this publication does not imply endorsement by the North Carolina State University or USDA, ARS of the products named nor criticism of similar ones not mentioned. 105
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Abstract SCHIRACK, ANDRIANA VAIS. T
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THE EFFEGT OF MICROWAVE BLANCHING O
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BIOGRAPHY Andriana Schirack is orig
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TABLE OF CONTENTS v Page List of Ta
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Materials and Methods..............
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Table 3 High Impact Aroma-Active Co
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CHAPTER 1: INTRODUCTION 1
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The processing parameters used duri
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educed from 35-40% moisture to 8-10
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REFERENCES Adelsberg GD, Sanders TH
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Interdependency and underlying dime
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Composition of Peanuts The structur
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and Burma. The peanut prices in the
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(w.b.) within 3 days, large quality
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cdry = Specific heat of dry seeds (
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there is no direct correlation publ
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Peanuts are commonly stored in flat
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lanching has been imitated using a
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(1999), no detrimental effects of b
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when the air is distributed from ab
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y-product (Giese, 1992). Drying is
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the material to absorb electromagne
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ε' = Relative real permittivity (d
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oils, both ε' and ε" are low and
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1969). The flavor characteristics o
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et al., 1980). Likewise, sugars pre
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n-methylpyrrole. Walradt et al. (19
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fact, Ory et al. (1992) suggested t
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Flavor Research in Other Nuts Sever
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changed with time of roasting and i
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polyunsaturated acids that have a c
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hexanal are intensified to the high
Page 65 and 66: The results of temperature stress i
Page 67 and 68: Brown et al. (1977) found that the
Page 69 and 70: exhibited the fruity fermented off-
Page 71 and 72: (Pawliszyn, 2000). Also, the elevat
Page 73 and 74: compounds eluting from microwave-he
Page 75 and 76: Table 1: Peanut Volatile Analysis b
Page 77 and 78: the identification of volatile comp
Page 79 and 80: the detector. The compounds can the
Page 81 and 82: GC-O Applications High vacuum disti
Page 83 and 84: each half was allocated into one of
Page 85 and 86: Woody/Hulls/Skins Cardboard Table 2
Page 87 and 88: Givaudan-Roure developed Quantitati
Page 89 and 90: during high temperature microwave b
Page 91 and 92: OVM Organic volatiles meter Pa Pasc
Page 93 and 94: References Abegaz EG, Kerr WL, Koeh
Page 95 and 96: odorants in high temperature cured
Page 97 and 98: 17(4): 728-732. Mason ME, Waller GR
Page 99 and 100: partitioning constants and release
Page 101 and 102: Vercellotti JR, Crippen KL, Lovegre
Page 103 and 104: ABSTRACT Peanut blanching consists
Page 105 and 106: peanut moisture content from 5.5 to
Page 107 and 108: The computer monitored power output
Page 109 and 110: RESULTS AND DISCUSSION Energy Absor
Page 111 and 112: All treatments using the fan (F) ha
Page 113 and 114: Treatments 11NF, 8NF, and 5NF also
Page 115: lanchabilities as well as a longer
Page 119 and 120: REFERENCES ADELSBERG, G.D. and SAND
Page 121 and 122: TABLES AND FIGURES Table 1: Process
Page 123 and 124: Energy absorbed (kJ) 3000 2500 2000
Page 125 and 126: Temperature of peanuts (°C) 160 14
Page 127 and 128: Percent blanchability 100 90 80 70
Page 129 and 130: Maximum internal temperature (°C)
Page 131 and 132: ABSTRACT Microwave blanching of pea
Page 133 and 134: Several methods are used for blanch
Page 135 and 136: Peanuts MATERIALS AND METHODS Mediu
Page 137 and 138: Canada) on a laptop computer (Dell
Page 139 and 140: Sensory Analysis RESULTS AND DISCUS
Page 141 and 142: significantly lower final moisture
Page 143 and 144: ACKNOWLEDGMENTS Funded in part by t
Page 145 and 146: Foods and Beverages, Vol. 29, (G. C
Page 147 and 148: TABLE LEGENDS Table 1. Microwave ap
Page 149 and 150: TABLE 2. LEXICON OF PEANUT FLAVOR D
Page 151 and 152: Sweet Aromatic TABLE 4. CORRELATION
Page 153 and 154: CHAPTER 5: CHARACTERIZATION OF AROM
Page 155 and 156: Introduction The most common use of
Page 157 and 158: The objective of this study was to
Page 159 and 160: attributes which were different fro
Page 161 and 162: Volatile compounds from the solvent
Page 163 and 164: 0.25 μm df; J & W Scientific, Fols
Page 165 and 166: adjusted with the same concentratio
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characterized by the attributes of
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(E,E)-2,4-decadienal (fried/oxidize
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flavor dilution factors, nor did th
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that of the control, but only in th
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e high enough for pyrazine formatio
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sensory panelists analyzing process
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References (ASTM) American Society
Page 181 and 182:
Megahed MG. 2001. Microwave roastin
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Vercellotti JR, Mills OE, Bett KL,
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Table 2- Model system concentration
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28 4-acetoxy-2,5-dimethyl- 3(2H)-fu
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Table 5 - Quantification, sensory o
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Conclusions This research investiga
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microwave technology may provide ma
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protect against colon, prostate, an
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APPENDICES 185
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SAFE (3 SAFE's can be done in 1 day
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2. Turn off waterbath. 3. Turn off
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5. Filter through a third sodium su
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contamination, and run a blank on t
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AC nutty/burnt 975 1.5 NB cabbage/g
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AC oxidized 1289 1.5 NB dusty/nutty
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NB brothy 1612 3.5 NB honey/hay 161
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Table 2: Aroma-Active Compounds in
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AC cedar 1081 3.0 AC burnt sugar/nu
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AC brothy 1350 2.0 NB garlic 1352 5
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NB fruity/floral 1670 3.0 NB rosy 1
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