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

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method using a 15 point intensity scale (Meilgaard et al., 1999), and samples were described using the peanut lexicon developed by Johnsen et al. (1988) and Sanders et al. (1989), with the addition of some attributes specifically for this study (Table 2). Each sample was evaluated in duplicate by each panelist. The microwave-related off-flavor first noted by Katz (2002) was described as Dark Soured Aromatic (DSA). However, no standardized references were available for this attribute. Throughout panel training and calibration discussions for the present study, the term DSA was discarded and the term ashy, as defined by the aroma of cigarette ash, was added. Discussion of the initial analysis of microwave- blanched samples revealed some difficulty in agreement on the exact nature of off- flavors detected. As a result, the total offnote term, which encompassed all negative attributes which were unique from the control, was used and proved effective in differentiating the samples. Data Analysis The results were analyzed using the general linear model procedure in SAS (Version 9.1, SAS Institute Inc., Cary, NC), with Fisher’s least significant difference used as a post-hoc test. Correlation analysis was used to describe relationships amongst the variables and samples. 126
Sensory Analysis RESULTS AND DISCUSSION Microwave exposure time and use of air circulation had a significant effect on peanut flavor attributes (Table 3) such as roasted peanutty, sweet aromatic, dark roast, raw beany, woody, bitter, ashy, and sweet (p < 0.0001), as well as on cardboardy/stale (p < 0.001). Although these attributes were statistically significant, some of the differences between treatments for attributes such as roast peanutty or sweet aromatic were not likely to be meaningful in practical terms due to the small range in average score. In the range of processing parameters examined, treatment 11NF was the most different, because it was significantly higher in total offnote (Table 3). The 11NF treatment was characterized by higher cardboardy/stale, bitter, dark roast and ashy attribute intensities, while being characterized less by the raw beany attribute. The attribute, total offnote, was incorporated into the lexicon as an additional tool to differentiate the processing treatments. The total offnote term does not describe the specific attributes of the sample, so future work should characterize this offnote using a descriptive panel. However, treatments were differentiated based on total offnote (p < 0.0001), indicating that this term was effective in a basic categorization of processing effects. Several of the sample attributes were correlated to each other (Table 4). Desirable attributes such as roast peanutty, sweet aromatic, and sweet taste positively correlated with each other, and negatively correlated with bitter, ashy, and 127
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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
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The results of temperature stress i
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Brown et al. (1977) found that the
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exhibited the fruity fermented off-
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(Pawliszyn, 2000). Also, the elevat
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compounds eluting from microwave-he
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Table 1: Peanut Volatile Analysis b
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the identification of volatile comp
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the detector. The compounds can the
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GC-O Applications High vacuum disti
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each half was allocated into one of
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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 and 116: lanchabilities as well as a longer
Page 117 and 118: microwave attain much higher temper
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: Canada) on a laptop computer (Dell
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
Page 167 and 168: characterized by the attributes of
Page 169 and 170: (E,E)-2,4-decadienal (fried/oxidize
Page 171 and 172: flavor dilution factors, nor did th
Page 173 and 174: that of the control, but only in th
Page 175 and 176: e high enough for pyrazine formatio
Page 177 and 178: sensory panelists analyzing process
Page 179 and 180: References (ASTM) American Society
Page 181 and 182: Megahed MG. 2001. Microwave roastin
Page 183 and 184: Vercellotti JR, Mills OE, Bett KL,
Page 185 and 186: Table 2- Model system concentration
Page 187 and 188: 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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